@article { ISI:000226290900011, title = {Rearrangement of allyl phenyl ether over Al-MCM-41}, journal = {Journal of Catalysis}, volume = {229}, number = {1}, year = {2005}, month = {JAN}, pages = {105-113}, publisher = {ACADEMIC PRESS INC ELSEVIER SCIENCE}, type = {Article}, address = {525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA}, abstract = {

Claisen rearrangement of allyl phenyl ether to o-allylphenol and a dihydrobenzofuran derivative was investigated over MCM-41 with different Si/Al ratios. Higher aluminum content, higher reaction temperatures, and longer run duration favor the formation of the ring compound 2,3-dihydro-2-methyl benzofuran. There is a close relationship between acidity and conversion, which suggests that the reaction occurs inside the large pores of MCM-41. The influence of temperature and catalyst Si/Al ratio on the reaction are examined by kinetic analysis, under the assumption of a first-order consecutive reaction. (C) 2004 Elsevier Inc. All rights reserved.

}, keywords = {Al-MCM-41, allyl phenyl ether, Claisen rearrangement, Mesoporous material, molecular rearrangement, Solid acids}, issn = {0021-9517}, doi = {10.1016/j.jcat.2004.09.027}, author = {Mathew, Nevin T. and Khaire, S. and Mayadevi, S. and Jha, Ratnesh Kumar and Sivasanker, S.} } @article { ISI:000241306300002, title = {Claisen rearrangement of allyl phenyl ether over zeolites beta, mordenite and Y}, journal = {Microporous and Mesoporous Materials}, volume = {95}, number = {1-3}, year = {2006}, month = {OCT}, pages = {8-16}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

The Claisen rearrangement of allyl phenyl ether (APE) to o-allylphenol was investigated over zeolites beta (BEA), mordenite (MOR) and Y (FAU) with different Si/Al ratios. Over the zeolite catalysts, the allylphenol cyclized to produce 2,3-dihydro-2-methyl benzofuran. Larger catalyst loading, higher reaction temperatures and longer run duration favored the formation of the ring compound. Conversion was small over MOR and FAU although they possessed higher acidity (as measured by the temperature programmed desorption of ammonia) compared to BEA. Studies using BEA revealed that the nature of the solvent influenced the reaction rate. The order of reactivity in the solvents was, benzene \> EDC (1,2-dichloroethane) \> toluene \> TCE (1, 1,2,2-tetrachloroethane) \>\> ACN (acetonitrile). The intermediate allylphenol reacted with the aromatic solvents to produce byproducts when benzene and toluene were used as solvents. A kinetic analysis assuming first order series and parallel reactions is presented. (c) 2006 Elsevier Inc. All rights reserved.

}, keywords = {allyl phenyl ether, allylphenol, Benzofuran, Claisen rearrangement, zeolites}, issn = {1387-1811}, doi = {10.1016/j.micromeso.2006.05.001}, author = {Wagholikar, S. G. and Mayadevi, S. and Jacob, Nalini E. and Sivasanker, S.} } @article { ISI:000239077500014, title = {Liquid phase alkylation of phenol with 1-octene over large pore zeolites}, journal = {Applied Catalysis A-General}, volume = {309}, number = {1}, year = {2006}, month = {JUL}, pages = {106-114}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

A comparative study is presented of the liquid phase alkylation of phenol with 1-octene over different zeolite catalysts: H-beta (BEA(15)), H-mordenite (MOR(11)) and H-USY (FAU(15)). A wide spectrum of monoalkylated products, identified as isomers of phenyl octyl ether (O-alkylate) and octyl phenol (C-alkylate), was formed in the reaction. The reaction was studied in detail over BEA(15), such studies included the influence of process variables such as temperature, reactant mole ratio, catalyst amount and alkali metal (K) poisoning on its performance in the alkylation reaction. A kinetic analysis of the reaction over BEA(15) was also carried out assuming a second order parallel reaction mechanism. The activity of the different catalysts for the reaction followed the order: BEA(15) \> FAU(15) \> MOR(11). The poisoning of BEA(15) with potassium resulted in a decrease in the catalyst activity concomitant with a decrease in the number of strong acid centres in the catalyst. (c) 2006 Elsevier B.V. All rights reserved.

}, keywords = {1-octene, alkyl phenols, Alkylation, phenol, zeolites}, issn = {0926-860X}, doi = {10.1016/j.apcata.2006.04.041}, author = {Wagholikar, Smita and Mayadevi, S. and Sivasanker, S.} } @article {Rai, title = {Liquid phase oxidation of alkanes using Cu/Co-perchlorophthalocyanine immobilized MCM-41 under mild reaction conditions}, journal = {Applied Catalysis A-General}, volume = {297}, number = {2}, year = {2006}, month = {JAN}, pages = {220-230}, publisher = {ELSEVIER SCI LTD}, type = {Article}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND}, abstract = {

{Amino-functionalized MCM-41 (NH2-MCM-41) was used to immobilize CU/CO-Cl16PC complex, i.e. Cu/Co-AM(PS) for liquid phase oxidation of alkanes under mild reaction conditions. Higher rates of reaction and better catalytic activity values were obtained for Cu/Co-AM(PS) as compared to Cu/Co-Cl16PC grafted on (i) amino-functionalized SiO2 [

}, keywords = {Ceramics, Electron microscopy, electronic materials, X-ray diffraction}, issn = {0272-8842}, doi = {10.1016/j.apcata.2005.09.012}, author = {Karandikar, Prashant R. and Chandwadkar, Asha J. and Agashe, M. and Ramgir, N. S. and Sivasanker, S.} } @article { ISI:000243831600015, title = {Acylation of anisole with long-chain carboxylic acids over wide pore zeolites}, journal = {Applied Catalysis A-General}, volume = {317}, number = {2}, year = {2007}, month = {FEB}, pages = {250-257}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

The acylation of anisole with long-chain carboxylic acids (hexanoic, octanoic and decanoic) has been studied over three large pore zeolites-beta (BEA), faujasite (FAU) and mordenite (MOR). The acylation of anisole with the long chain acids produced mainly the ketone (4-methoxy phenyl alkyl ketone) and small amounts of the ester (phenyl alkanoate). The results revealed the reaction to be influenced by the type of zeolite and its Si/Al ratio (acidity) besides the chain length (carbon number) of the carboxylic acid. In the acylation of anisole with hexanoic acid, the activity of the zeolites increased with dealumination as it led to the generation of mesopores that resulted in a decrease in diffusion resistance of the zeolites. The reactivity of the acids in the acylation reaction was found to decrease with increase in the carbon number. The experimental data have been fitted into a pseudo first order kinetic model. (c) 2006 Elsevier B.V. All rights reserved.

}, keywords = {Acylation, Anisole, decanoic acid, hexanoic acid, octanoic acid, zeolites}, issn = {0926-860X}, doi = {10.1016/j.apcata.2006.10.023}, author = {Wagholikar, S. G. and Niphadkar, P. S. and Mayadevi, S. and Sivasanker, S.} } @article { ISI:000292212700020, title = {Alkylation of anisole with 1-hexene and 1-hexanol over zeolite H-beta}, journal = {Reaction Kinetics Mechanisms and Catalysis}, volume = {103}, number = {2}, year = {2011}, month = {AUG}, pages = {481-491}, publisher = {SPRINGER}, address = {VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS}, abstract = {

An examination of the kinetics of the alkylation of anisole with 1-hexene and 1-hexanol to produce alkylates over zeolite H-beta is presented. Anisole alkylation is found to occur by a set of parallel reactions when hexene is used as the alkylating agent. When hexyl alcohol is the alkylating agent, the reaction follows a multi-step parallel-series mechanism to form monoalkylates and dihexylether. With 1-hexene, a group of isomeric alkylates, viz., ortho-2-hexyl anisole (2-OHA), ortho-3-hexyl anisole (3-OHA), para-2-hexyl anisole (2-PHA), and para-3-hexyl anisole (3-PHA) was obtained. With hexanol, the olefin (hexene) and dihexyl ether were obtained additionally. The influence of process parameters like temperature, catalyst quantity, and alkylating agent on reaction behavior is reported.

}, keywords = {Alkylation, Anisole, H-beta, Hexene, Hexyl alcohol}, issn = {1878-5190}, doi = {10.1007/s11144-011-0310-7}, author = {Surse, P. V. and Wagholikar, S. and Mayadevi, S. and Sivasanker, S.} } @article { ISI:000311350000002, title = {Special Issue dedicated to Paul Ratnasamy on the occasion of his 70th birthday preface}, journal = {Catalysis Today}, volume = {198}, number = {1, SI}, year = {2012}, month = {DEC}, pages = {1-2}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, issn = {0920-5861}, doi = {10.1016/j.cattod.2012.10.011}, author = {Reddy, Benjaram M. and Sivasanker, S. and Ramaswamy, A. V.} } @article {45662, title = {Hydrogenolysis of sorbitol over Ni, Pt and Ru supported on SBA-15}, journal = {Indian Journal of Chemistry. Section A: Inorganic, Physical, Theoretical \& Analytical Chemistry}, volume = {56 }, year = {2017}, month = {FEB}, pages = {226-231}, type = {Article}, abstract = {Hydrogenolysis of sorbitol (15\% aqueous solution) has been carried out in a batch reactor over Ni (6 wt\%), Pt (1 wt\%) and Ru (1 wt\%) supported on SBA-15 and carbon coated SBA-15 (SBA-15(C)). For comparison, the three metals have also been supported on activated carbon (AC). The catalysts are characterized by XRD, N-2 and H-2 adsorption measurements. Addition of Ca(OH)(2) to the reaction mixture increases conversion and selectivity for the dihydroxy compounds, 1,2-propanediol (PD) and ethylene glycol (EG). Based on yield of dihydric alcohols (PD+EG), the performance of the catalysts at 220 degrees C and 60 bar in the presence of Ca(OH)(2) is in the order: Ru-AC similar to Ru-SBA-15(C) > Ru-SBA-15 similar to Ni-SBA-15, the yields being 40, 39, 31 and 29 wt\%, respectively.}, url = {http://nopr.niscair.res.in/handle/123456789/40903}, author = {Banu, M. and Sankaranarayanan, T. M. and Venuvanalingam, P. and Magesh, G. and Sivasanker, S.} } @article {48430, title = {Suitability of different supported Ru, Pt and Ni catalysts for the hydrogenolysis of sorbitol}, journal = {Results in Engineering}, volume = {15}, year = {2022}, month = {SEP}, pages = {100594}, type = {Article}, abstract = {

In this article, the results of sorbitol\ hydrogenolysis\ (15\% aq. solution), done in an autoclave reactor, over Ru, Pt and Ni loaded on SBA15, carbon coated SBA15 (SBA15C), activated carbon (AcC), Na{\textendash}Y, Fly Ash (FA) and hydroxyapatite (HAP) catalysts by our group, were compared to find the best metal-support combinations. The metal loading was 1\ wt\% for Ru and Pt, 6\ wt\% for Ni and the catalysts{\textquoteright} preparations were carried out by impregnation of respective salts. The catalysts were characterized with nitrogen and hydrogen adsorption measurements and X-ray diffraction. Addition of a base (Calcium hydroxide) to the reactants{\textquoteright} mixture increased the overall conversion and selectivities of the glycols, ethylene glycol (EG) and 1,2-propylene glycol (PG). The catalysts{\textquoteright} performance at 60\ bar and 220\ {\textdegree}C with the presence of base (B), evaluated by the yield of glycols (PG\ +\ EG), showed the following order:

Ni/Na{\textendash}Y\ \>\ Ru/AcC\ \~{}\ Ru/SBA15C\ \>\ Ni/HAP\ \~{}\ Ru/SBA15\ \>\ Ni/SBA15\ \>\ Ru/Na{\textendash}Y\ \>\ Ni/FA\ \~{}\ Ni/AcC and the yields were 57, 40, 39, 33, 31, 29, 26, 22 and 21\ wt\%, respectively.

Na{\textendash}Y appeared to be the best support, especially for Ni metal; AcC and SBA15C were good supports for Ru and Pt respectively.\ Reusability\ studies revealed that Ni on HAP was the best catalyst and exhibited only a small deactivation during four runs of loading it.

}, doi = {10.1016/j.rineng.2022.100594}, author = {Kandasamy, Thirunavukkarasu and Banu, Marimuthu and Shanthi, R. Vijaya and Sivasanker, S.} }