01786nas a2200241   4500008004100000022001400041245008900055210006900144260007300213300001200286490000800298520094400306653001101250653002901261653000801290653002101298100002001319700001901339700002001358700002301378700002801401856011501429       2014                        eng d  a0926-337300aMagnesia doped Ag/Al2O3 - sulfur tolerant catalyst for low temperature HC-SCR of NOx0 aMagnesia doped AgAl2O3 sulfur tolerant catalyst for low temperat  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJAN  a408-4150 v1443 a<p>A series of magnesia doped Ag/Al2O3 catalysts were prepared by modified impregnation method using boehmite as alumina precursor. The prepared catalysts were characterized and tested for the SCR of NOx using propene as reductant under lean condition. Doping of magnesia improved the low temperature catalytic activity for HC-SCR of NOx as well as sulfur tolerance. Maximum 98% NO conversion with 100% selectivity for N-2 was obtained at 350 degrees C with 7% Mg doping to Ag/Al2O3. The improvement in low temperature activity and the sulfur tolerance has been correlated to decreased acidity after addition of magnesia to alumina support. In situ FTIR study showed that the deactivation in the presence of SO2 was due to the sulfation of silver and aluminum sites in Ag/Al2O3 catalyst, however its formation was suppressed in case of magnesia doped Ag/Al2O3 improving its sulfur tolerance. (C) 2013 Elsevier B.V. All rights reserved.</p>10aHC-SCR10aLow temperature activity10aNOx10aSulfur tolerance1 aMore, Pavan, M.1 aJagtap, Neelam1 aKulal, Atul, B.1 aDongare, Mohan, K.1 aUmbarkar, Shubhangi, B.  uhttp://library.ncl.res.in/content/magnesia-doped-agal2o3-sulfur-tolerant-catalyst-low-temperature-hc-scr-nox-002259nas a2200193   4500008004100000245012500041210006900166260000800235300001600243490000600259520153400265100002301799700002301822700002001845700002001865700002301885700002801908856012901936       2017                        eng d00aPalladium supported on fluorinated magnesium hydroxide: an efficient catalyst for hydrogenation under ambient conditions0 aPalladium supported on fluorinated magnesium hydroxide an effici  cNOV  a10618-106270 v23 a<p>In this study palladium supported on fluorinated magnesium hydroxide (Pd-MgF2-x(OH)(x)) was synthesized by fluorination of magnesium hydroxide using aqueous HF as fluorinating agent. The Mg(OH)(2) dissolves in HF and precipitates as magnesium hydroxide fluoride. The Pd precursor was added in the same pot during precipitation of MgF2-x(OH)(x). The final catalyst after drying at 250 degrees C has shown very high efficiency for hydrogenation of styrene and range of nitro aromatics at room temperature and atmospheric pressure. Hydrogenation of styrene has led to 37% conversion with 100% selectivity for hydrogenation of double bond after 3 h. The catalyst was successfully recycled for styrene hydrogenation without appreciable loss in the activity. Further hydrogenation of nitro-aromatics was achieved with 99% conversion and 100% aniline selectivity at room temperature and atmospheric pressure. The turnover number of similar to 21774 was obtained for nitrobenzene hydrogenation. The catalyst has shown mesoporous nature (pore volume 0.25 cc/g, pore diameter 4.8 nm) with very high surface area of 106 m(2)/g. The palladium particle size was found to be in the range of 10-11 nm. Acidity measurements by FTIR of adsorbed pyridine revealed presence of Lewis acidic sites with moderate acidity. Mechanistic studies using in-situ FTIR analysis for nitrobenzene hydrogenation revealed activation of nitrobenzene on the Lewis acid sites of the support whereas activation of hydrogen by heterolytic cleavage on Pd center.</p>1 aKokane, Reshma, S.1 aAcham, Vaibhav, R.1 aKulal, Atul, B.1 aKemnitz, Erhard1 aDongare, Mohan, K.1 aUmbarkar, Shubhangi, B.  uhttp://library.ncl.res.in/content/palladium-supported-fluorinated-magnesium-hydroxide-efficient-catalyst-hydrogenation-under02005nas a2200205   4500008004100000245010800041210006900149260000800218300001000226490000800236520125100244100002501495700003001520700002101550700002001571700002801591700002301619700002701642856013001669       2018                        eng d00aMesoporous tin oxide: an efficient catalyst with versatile applications in acid and oxidation catalysis0 aMesoporous tin oxide an efficient catalyst with versatile applic  cJUL  a61-760 v3093 aMesoporous tin oxide was prepared by template assisted and template-free methods. As-prepared materials were calcined at various temperatures to generate different nature (Bronsted and Lewis), amount and strength of acidic sites. The physico-chemical properties of the catalysts were studied by XRD, N-2 sorption, pyridine-FTIR, NH3-TPD, DRS UV-vis, TGA, SEM, TEM, H-1 MAS and Sn-119 MAS NMR analyses. The catalytic behavior of mesoporous tin oxide catalysts was evaluated for acetalization and ketalization of glycerol with benzaldehyde and acetone respectively under solvent free conditions. The catalytic performance of mesoporous tin oxide was compared with that of other conventional solid acid catalysts namely H-ZSM-5, H-mordenite, H-beta, Al-MCM-41, Al-SBA-15 and Al-TUD-1. The efficiency of mesoporous tin oxide was also tested for cyclohexene epoxidation reaction. The catalyst prepared by template assisted method showed excellent catalytic performance compared to other catalysts due the difference in nature and amount of acidic sites in the catalyst. Meso-SnO2-T-350 was stable and reusable catalyst for four cycles without any appreciable loss in activity, and therefore it offers a good catalyst for potentially wide applications.1 aManjunathan, Pandian1 aMarakatti, Vijaykumar, S.1 aChandra, Prakash1 aKulal, Atul, B.1 aUmbarkar, Shubhangi, B.1 aRavishankar, Raman1 aShanbhag, Ganapati, V.  uhttp://library.ncl.res.in/content/mesoporous-tin-oxide-efficient-catalyst-versatile-applications-acid-and-oxidation-catalysis