@article { ISI:000230389700020, title = {Copper(II) ion-exchanged montmorillonite as catalyst for the direct addition of N-H bond to CC triple bond}, journal = {Journal of Molecular Catalysis A - Chemical}, volume = {236}, number = {1-2}, year = {2005}, month = {JUL}, pages = {139-144}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

An efficient synthesis of phenyl-(1-phenylethylidene)amine using copper-exchanged montmorillonite clay (Cu K-10) is demonstrated. The catalyst was characterized using UV-vis, XRD, BET surface area measurements, pyridine adsorption etc. The XRD and surface area measurement show that the structural characteristics of the support montmorillonite K-10 (K-10) are preserved after Cu exchange. The hydroamination of phenyl acetylene with aniline was carried out in toluene under reflux condition in N-2 atmosphere at 393 K. The reaction is highly regio-selective for only Markovnikoff{\textquoteright}s addition of an-tine to CC multiple bond and proceeded smoothly to completion. The reaction conditions were optimized to obtain complete conversion with respect to phenyl acetylene. Reaction data showed that the activity of the catalyst in hydroamination reaction is greater at higher reaction temperatures and nonpolar solvents and NZ pressure promotes the reaction drastically. (c) 2005 Elsevier B.V. All rights reserved.

}, keywords = {alkyne, Aniline, Catalyst, hydroamination, K-10 montmorillonite clay, phenyl acetylene}, issn = {1381-1169}, doi = {10.1016/j.molcata.2005.04.022}, author = {Joseph, Trissa and Shanbhag, G. V. and Halligudi, Shivappa B.} } @article { ISI:000230122100004, title = {High-temperature stable and highly active/selective supported NiCoMgCeOx catalyst suitable for autothermal reforming of methane to syngas}, journal = {Journal of Catalysis}, volume = {233}, number = {1}, year = {2005}, month = {JUL}, pages = {36-40}, publisher = {ACADEMIC PRESS INC ELSEVIER SCIENCE}, type = {Article}, address = {525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA}, abstract = {

Low-surface-area, macroporous, zirconia-haffnia-supported NiCoMgOx and NiCoMgCeOx (Ni/Co/Mg/Ce = 1/0.2/1.2/0.0 or 1.2) catalysts, precalcined at high temperature ( 1400 degrees C for 4 h), showed both high activity (\> 98\% conversion) and selectivity ( \> 95\%) in the catalytic partial oxidation of methane (CPOM) to syngas. Their performance remained unchanged even after they were subjected to higher temperature (\> 2000 degrees C for 30 min) or a number of high-temperature (\> 2000 degrees C) shocks, due to their direct exposure to an oxyacetylene flame. The supported NiCoMgCeOx, however, showed superior performance in the steam and CO2 reforming reactions because of its much higher lattice oxygen mobility. Hence it is more suitable for the autothermal reforming of methane. (c) 2005 Elsevier Inc. All rights reserved.

}, keywords = {autothermal reforming of methane, Catalyst, catalytic partial oxidation of methane, CO2 reforming of methane, high-temperature stable supported NiCoMgCeOx catalyst, steam reforming of methane, zirconia-haffnia-supported NiCoMgCeOx catalysts, zirconia-haffnia-supported NiCoMgOx}, issn = {0021-9517}, doi = {10.1016/j.jcat.2005.04.019}, author = {Choudhary, Vasant R. and Mondal, Kartick C. and Mamman, Ajit Singh} } @article { ISI:000229488700008, title = {Vapor phase oxidation of 4-fluorotoluene over vanadia-titania catalyst}, journal = {Journal of Molecular Catalysis A - Chemical}, volume = {234}, number = {1-2}, year = {2005}, month = {JUN}, pages = {51-57}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

The vapor phase oxidation of 4-fluorotoluene has been carried out over vanadia-titania catalysts with moderate conversion and selectivity for 4-fluorobenzaldehyde. Two series of V2O5/TiO2 catalysts with 1-10 mol\% vanadia were prepared by sol-gel technique using vanadium and titanium peroxide as vanadia and titania precursors respectively and by impregnation technique using vanadium peroxide on anatase titania support. The samples were characterized by X-ray diffraction, NH3-TPD, FT-IR and BET surface area measurements. The XRD of the catalysts prepared by impregnation technique showed retention of the anatase titania whereas the catalysts prepared by sol-gel technique showed the formation of rutile titania with minor amount of anatase phase at lower vanadia content (1-3 \%), which completely transformed into anatase phase at higher vanadia loading. The samples prepared by sol-gel method showed higher acidity and surface area compared to the samples prepared by impregnation. Pyridine adsorption study by FT-IR revealed the presence of Lewis acidity at lower vanadia loading (1-3 \%) and presence of both Lewis as well as Bronsted acidity at higher vanadia loading. The catalytic activity for oxidation of 4-fluorotoluene increased with vanadia loading in the sol-gel catalysts. The catalysts prepared by impregnation technique were found to be less active. However the selectivity for 4-fluorobenzaldehyde decreased with increase in vanadia content. The influence of vanadia loading, reaction temperature and contact time on the catalytic activity for 4-fluorotoluene oxidation has been investigated. The structure of the catalyst and its catalytic activity has been correlated. (c) 2005 Elsevier B.V. All rights reserved.

}, keywords = {Catalyst, fluorotoluene, Oxidation, vanadia-titania, vapor phase}, issn = {1381-1169}, doi = {10.1016/j.molcata.2005.02.020}, author = {Maurya, S. K. and Patil, P. and Shubhangi B. Umbarkar and Gurjar, M. K. and Dongare, Mohan K. and Rudiger, S. and Kemnitz, E.} } @article { ISI:000255189100003, title = {Chemoselective synthesis of beta-amino acid derivatives by hydroamination of activated olefins using AISBA-15 catalyst prepared by post-synthetic treatment}, journal = {Journal of Molecular Catalysis A-Chemical}, volume = {284}, number = {1-2}, year = {2008}, month = {APR}, pages = {16-23}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

beta-Amino acid derivatives have a wide variety of applications viz. in the synthesis of peptide analogues, precursor for amino alcohols, optically active amino acids, lactums and diamines. Chemoselective anti-Markovnikov hydroamination reaction of activated olefins was effectively used to synthesize beta-amino acid derivatives using AlSBA-15 and AlMCM-41 catalysts. These catalysts with different Si/Al ratios were synthesized by isomorphous substitution of aluminium into the framework of SBA-15, which induces the Bronsted and Lewis acid sites. The structural integrity of the catalysts was established by characterizing with XRD, N-2-sorption, TEM, NH3-TPD Al-27 MAS NMR and Si-29 MAS NMR techniques. Hydroamination of ethyl acrylate with aniline was used as a test reaction, which gave N-[2-(ethoxycarbonyl)ethyl] aniline with high selectivity. The performance of AlSBA-15 catalyst was also determined with different acrylates and amines to know the general applicability of the catalyst in hydroamination reactions. (C) 2008 Elsevier B.V. All rights reserved.

}, keywords = {acrylate, activated olefin, addition, AlMCM-41, AlSBA-15, Amine, beta-amino acid, Catalyst, hydroamination, Mesoporous}, issn = {1381-1169}, doi = {10.1016/j.molcata.2007.12.025}, author = {Shanbhag, Ganapati V. and Kumbar, S. M. and Halligudi, Shivaraj B.} } @article { ISI:000271067400004, title = {Cu(OTf)(2)-catalyzed alpha-halogenation of ketones with 1,3-dichloro-5,5 {\textquoteleft}-dimethylhydantoin and N-bromosuccinimide}, journal = {Indian Journal of Chemistry Section B-Organic Chemistry including Medicinal Chemistry}, volume = {48}, number = {10}, year = {2009}, month = {OCT}, pages = {1424-1430}, publisher = {COUNCIL SCIENTIFIC \& INDUSTRIAL RES}, address = {ANUSANDHAN BHAWAN, 2 RAFI MARG, NEW DELHI, 110001, INDIA}, abstract = {

Copper(II) triflate catalyses efficiently the alpha-halogentation of aryl or alkyl ketones with 1,3-dichloro-5,5{\textquoteright}-dimethyl-hydantoin and N-bromosaccinimde to give the corresponding alpha,alpha-dichloroketones and alpha-bromoketones in high yield with excellent product selectivity.

}, keywords = {Bromination, Catalyst, chlorination, copper (II), Ketone, Lewis acid}, issn = {0376-4699}, author = {Jagdale, Arun R. and Chouthaiwale, Pandurang V. and Sudalai, Arumugam} } @article { ISI:000271072500019, title = {Disproportionation of ethylbenzene in the presence of C-8 aromatics}, journal = {Journal of Natural Gas Chemistry}, volume = {18}, number = {3}, year = {2009}, month = {SEP}, pages = {369-374}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

The selective synthesis of p-diethylbenzene (p-DEB) by disproportionation of ethylbenzene (EB) in the presence of aromatics like m- and p-xylene isomers has been studied over a pore size regulated HZSM-5 catalyst. The industrial feed having different compositions of ethylbenzene and xylene isomers was used for the experimentation. Hence, they were expected to hinder the movement of reactant molecules both on the external surface and within the zeolite channels. It was observed that irrespective of the different feed compositions the concentration of the xylene isomers was intact in the product. There is no other byproducts formation like para-ethylmethyl benzene. The effects of varying the concentration of aromatic compounds in the feed on ethylbenzene conversion and product distribution over the parent and modified H-ZSM-5 catalyst have been discussed. Ethylbenzene disproportionation reaction follows the pseudo first order reaction with an activation energy of 8.6 kcal/mol.

}, keywords = {Catalyst, diethylbenzene, disproportionation, ethylbenzene, xylene isomers}, issn = {1003-9953}, doi = {10.1016/S1003-9953(08)60125-5}, author = {Sharnappa, N. and Pai, S. and Bokade, Vijay V.} } @article { ISI:000334895800005, title = {Engineering reactors for catalytic reactions}, journal = {Journal of Chemical Sciences}, volume = {126}, number = {2, SI}, year = {2014}, note = {21st National Symposium on Catalysis (CATSYMP), CSIR Indian Inst Chem Technol, Hyderabad, INDIA, FEB 11-13, 2013}, month = {MAR}, pages = {341-351}, publisher = {Catalysis Soc India}, address = {C V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIA}, abstract = {

Catalytic reactions are ubiquitous in chemical and allied industries. A homogeneous or heterogeneous catalyst which provides an alternative route of reaction with lower activation energy and better control on selectivity can make substantial impact on process viability and economics. Extensive studies have been conducted to establish sound basis for design and engineering of reactors for practising such catalytic reactions and for realizing improvements in reactor performance. In this article, application of recent (and not so recent) developments in engineering reactors for catalytic reactions is discussed. Some examples where performance enhancement was realized by catalyst design, appropriate choice of reactor, better injection and dispersion strategies and recent advances in process intensification/ multifunctional reactors are discussed to illustrate the approach.

}, keywords = {Catalyst, effectiveness, engineering, hydrodynamics, reactors}, issn = {0974-3626}, author = {Ranade, Vivek V.} } @article {43899, title = {Copper Cobalt Sulfide Nanosheets Realizing a Promising Electrocatalytic Oxygen Evolution Reaction}, journal = {ACS Catalysis}, volume = {7}, year = {2017}, month = {SEP}, chapter = {5871-5879}, abstract = {

Nanostructured CuCo2S4, a mixed metal thiospinel, is found to be a benchmark electrocatalyst for oxygen evolution reaction (OER) in this study with a low overpotential, a low Tafel slope, a high durability, and a high turnover frequency (TOF) at lower mass loadings. Nanosheets of CuCo2S4 are realized from a hydrothermal synthesis method in which the average thickness of the sheets is found to be in the range of 815 nm. Aggregated nanosheets form a highly open hierarchical structure. When used as an electrocatalyst, CuCo2S4 nanosheets offer an overpotential value of 310 mV at a 10 mA cm(2) current density, which remains consistent for 10000 measured cycles in a 1 M KOH electrolyte. A chronoamperometric study reveals constant oxygen evolution for 12 h at a 10 mV s(-1) scan rate without any degradation of the activity. Furthermore, the calculated mass activity of the CuCo2S4 electrocatalyst is found to be 14.29 A/g and to afford a TOF value of 0.1431 s(-1) at 310 mV at a mass loading of 0.7 mg cm(-2). For comparison, nanostructures of Co3S4 and Cu0.5Co2.5S4 have been synthesized using a similar method followed for CuCo2S4. When compared to the OER activities among these three thiospinels and standard IrO2, CuCo2S4 nanosheets offered the highest OER activities at the same mass loading (0.7 mg/cm(-2)). Extensive X-ray photoelectron spectroscopy and electron paramagnetic resonance analyses for a mechanistic study reveal that introduction of Cu into the Co3S4 lattice enhances the oxygen evolution and kinetics by offering Cu2+ sites for utilitarian adsorption of OH, O, and OOH reactive species and also by offering a highly active high-spin state of octahedral Co3+ for OER catalysis.

}, keywords = {Bifunctional Electrocatalyst, Catalyst, Cuco2s4, Efficient Electrocatalyst, electrocatalyst, Electronic-structure, Nanoparticles, Nanosheet, oxide, oxygen evolution, performance, Recent Progress, Water oxidation, Water Splitting Hydrogen Evolution}, doi = { 10.1021/acscatal.7b01831}, author = {Chauhan, Meenakshi and Reddy, Kasala Prabhakar and Gopinath, Chinnakonda S. and Deka, Sasanka} } @article {43987, title = {Manganese incorporated on glucose as an efficient catalyst for the synthesis of adipic acid using molecular O2 in aqueous medium}, journal = {Applied Catalysis A: General}, volume = {546}, year = {2017}, month = {SEP}, pages = {122-125}, type = {Journal Article}, abstract = {A new manganese incorporated on glucose catalyst Mn@CC-SO3H-NH2 was synthesized and well characterized using FT-IR, PXRD, EDAX, SEM, TEM, [13] C cross-polarization NMR and BET analysis. The catalyst thus synthesized was studied for its utility in the synthesis of industrially important chemical adipic acid starting from readily available cyclohexanone using molecular O2 as a source. Adipic acid was obtained in maximum yield of 82\% using Mn@CC-SO3H-NH2 catalyst in water as a solvent. The catalyst was easily recovered and reused for minimum five runs without any significant loss in the yield of products. Using molecular O2 as an oxidant and water as a solvent, the reaction is very important from green chemistry perspectives and can also be industrially feasible. }, keywords = {Adipic Acid, Catalyst, manganese, recyclable, Water}, doi = {10.1016/j.apcata.2017.08.008}, author = {Nale, S.D.}, editor = {Rathod, P. V.} } @article {43358, title = {Mechanistic aspects of wet and dry CO oxidation on Co3O4 nanorod surfaces: a NAP-UPS study}, journal = {ACS Omega}, volume = {2}, year = {2017}, month = {MAR}, pages = {828-834}, type = {Jouranl Article}, abstract = {

Catalytic activity, electronic structure, and the mechanistic aspects of Co3O4 nanorod (NR) surfaces have been explored for CO oxidation in dry and wet atmosphere using near-ambient pressure ultraviolet photoelectron spectroscopy. Presence of water with CO + O2 plummets the catalytic activity because of the change in the electronic nature from predominantly oxide (without water in feed) to a Co3O4 surface covered by a few intermediates. However, at >=375 K, the Co3O4 surface recovers and regains the oxidation activity, at least partially, even in the presence of water. This is fully supported by the changes observed in the work function of Co3O4 under wet (H2O + CO + O2) conditions compared with dry (CO + O2) conditions. This study focuses on the comparative CO oxidation rate on Co3O4 NR surfaces and highlights the changes in the electronic structure that occur in the catalyst during the CO oxidation reaction.

}, keywords = {Catalyst, Nano Structures, Power X-Ray Diffraction, spectra, Water Vapor}, doi = {10.1021/acsomega.6b00471}, author = {Ruchi Jain and Gnanakumar, Edwin S. and Gopinath, Chinnakonda S.} } @article {44539, title = {One pot synthesis and biological evaluation of some new pyridine-3,5-dicarbonitrile derivatives}, journal = {ChemistrySelect }, volume = {3}, year = {2018}, month = {MAR}, pages = {3374-3378}, abstract = {

We have developed eco-friendly route for the synthesis of title compounds by using simple compounds like aromatic aldehydes, malononitrile, 4-bromothiophenol and NaHCO3. In continuation to this, a series of pyridine-3,5-dicarbonitriles were synthesized with excellent yields and assessed for their invitro antitubercular and antimicrobial activity. The results of the antimicrobial study showed potent antimicrobial activity as compared to the standard drugs (Chloramphenicol and Griseofulvin). It was noticed that the presence of electron donating groups significantly increases the antibacterial activity of the newly synthesized compounds. The title compounds further evaluated for antitubercular activity and from the promising results, they were found to possess significant biological activity against M. tuberculosis.

}, keywords = {3, 4-Arylpyridine, 5-dicarbonitriles, Antimicrobial, Antitubercular, Catalyst}, issn = {2365-6549}, doi = {10.1002/slct.201702116}, author = {Joshi, Hitendra and Shah, Nirav and Sakar, Dhiman and Desai, N. C. and Jadeja, Krunalsinh A.} } @article {47585, title = {Active nickel hollow nanosphere supported over SiO2 catalyst for reduction of nitro compound}, journal = {Particulate Science and Technology}, volume = {40}, year = {2021}, month = {APR}, pages = {325-335}, type = {Article}, abstract = {

Nickel hollow nanospheres (Ni HNSs) was prepared by solvothermal method using mixture of ethylenediamine (EN) and ethanol (ET), sodium borohydride as reducing agent and nickel chloride hexahydrate as precursor. The particle size of the Ni HNSs were tuned by varying several parameters including precursor concentrations, reaction temperatures (130-190 degrees C), and ET to EN volume ratios. The particle size and morphology of Ni HNSs were confirmed by dynamic light scattering and transmission electron microscope, respectively. Spherical shape of Ni nanoparticles of 300 nm size having similar to 200 nm hollow space and 50 nm thickness was achieved at optimize condition of 4:6 volume ratio of ET/EN, 150 degrees C temperature, 0.1 M NaBH4 concentration, and 7 h. Ni HNSs supported over SiO2 (Ni HNSs/SiO2) with different loading of Ni HNSs (1-10 wt.\%) were prepared by impregnation method. The catalyst was characterized by X-ray diffraction, and inductively coupled plasma - optical emission spectroscopy. The catalytic performance of Ni HNSs/SiO2 was carried out in the reduction of 4-Nitrophenol (4-NP) to 4 - Aminophenol (4-AP). 5 wt.\% Ni HNSs/SiO2 exhibited 87\% reduction of 4-NP in 25 min and stable up to 6 catalyst cycles due to higher surface area of the catalyst.

}, keywords = {4-Aminophenol, 4-nitrophenol, Catalyst, hollow nanospheres, Nanoparticles, Nickel}, issn = {0272-6351}, doi = {10.1080/02726351.2021.1947424}, author = {Pawar, Priyanka S. and Lokhande, Aboli A. and Nandanwar, Sachin U. and Niphadkar, Prashant S. and Bokade, Vijay V.} } @article {47107, title = {Insertion copolymerization of functional olefins: Quo Vadis?}, journal = {European Polymer Journal}, volume = {143}, year = {2021}, month = {JAN }, pages = {110183}, type = {Article}, abstract = {

Functional polyethylene is a specialty polymer with unique set of properties and caters to a niche market. Currently, it is manufactured using high-pressure, high-temperature radical polymerization, or post-reactor (indirect) modification methods. Insertion copolymerization of functional olefins with ethylene provides a low pressure, direct route to prepare functional polyethylenes. However, insertion copolymerization of functional olefins with ethylene poses several impediments and requires special considerations. This review presents the current strategies, examines the progress, and attempts to gauge the commercial potential of direct synthesis of functional polyethylene. The performance of late transition metal catalysts derived from a-diimine, imine-phenolate, phosphine-sulfonate, bis-phosphine-mono-oxide, carbene-phenolate, phosphine-phenolate and their derivatives in the insertion copolymerization of functional olefins with ethylene is evaluated. While catalyst designing is crucial, incorporation of polar olefins that can serve an additional purpose is equally important. Therefore, we have organized the review in the following sections, polar alkenes with- acrylates, acrylic acids, acetates, nitriles, ethers, halides, two functional groups, cross-linking groups, dynamic interactions/self-healing properties, additional function/purpose, renewable functional olefins, and examine the progress. Among these, acrylates have been most intensively investigated and have been successfully incorporated in the polyethylene main-chain. Ethylene, methyl acrylate copolymers prepared by direct copolymerization reveal comparable melting temperature to that of LLDPE (at similar co-monomer content) and unfold the commercial potential of these materials. Recent developments on the insertion copolymerization of renewable functional olefins and di-functional olefins have elicited significant interest. This strategy is being viewed as a means of reducing environmental impact and enabling high functional group density at the same extent of incorporation. The overview thus offers a succinct account of insertion copolymerization of functional olefins, sheds light on the copolymer microstructure/material properties, and initiates a discussion on the commercial potential of functional polyethylene.

}, keywords = {Catalyst, Functional polyethylene, functional polyolefins, Hydrophilic polyethylene, insertion copolymerization, Polyethylene}, issn = {0014-3057}, doi = {10.1016/j.eurpolymj.2020.110183}, author = {Birajdar, Rajkumar S. and Chikkali, Samir H.} }