01523nas a2200265 4500008004100000022001400041245005500055210005300110260009500163300001200258490000800270520066200278653001400940653002300954653002600977653002401003653002801027653001601055100002201071700001501093700001701108700002401125700001901149856008901168 2005 eng d a0021-951700aRearrangement of allyl phenyl ether over Al-MCM-410 aRearrangement of allyl phenyl ether over AlMCM41 a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcJAN a105-1130 v2293 a

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.

10aAl-MCM-4110aallyl phenyl ether10aClaisen rearrangement10aMesoporous material10amolecular rearrangement10aSolid acids1 aMathew, Nevin, T.1 aKhaire, S.1 aMayadevi, S.1 aJha, Ratnesh, Kumar1 aSivasanker, S. uhttps://library.ncl.res.in/content/rearrangement-allyl-phenyl-ether-over-al-mcm-41-001904nas a2200241 4500008004100000022001400041245008400055210006900139260007300208300000900281490000700290520107400297653002301371653001601394653001501410653002601425653001301451100002301464700001701487700002201504700001901526856011701545 2006 eng d a1387-181100aClaisen rearrangement of allyl phenyl ether over zeolites beta, mordenite and Y0 aClaisen rearrangement of allyl phenyl ether over zeolites beta m aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcOCT a8-160 v953 a

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.

10aallyl phenyl ether10aallylphenol10aBenzofuran10aClaisen rearrangement10azeolites1 aWagholikar, S., G.1 aMayadevi, S.1 aJacob, Nalini, E.1 aSivasanker, S. uhttps://library.ncl.res.in/content/claisen-rearrangement-allyl-phenyl-ether-over-zeolites-beta-mordenite-and-y-001801nas a2200229 4500008004100000022001400041245007700055210006900132260007300201300001200274490000800286520104300294653001301337653001801350653001501368653001101383653001301394100002201407700001701429700001901446856010601465 2006 eng d a0926-860X00aLiquid phase alkylation of phenol with 1-octene over large pore zeolites0 aLiquid phase alkylation of phenol with 1octene over large pore z aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUL a106-1140 v3093 a

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.

10a1-octene10aalkyl phenols10aAlkylation10aphenol10azeolites1 aWagholikar, Smita1 aMayadevi, S.1 aSivasanker, S. uhttps://library.ncl.res.in/content/liquid-phase-alkylation-phenol-1-octene-over-large-pore-zeolites-001283nas a2200241 4500008004100000022001400041245012400055210006900179260009900248300001200347490000800359520035000367653001300717653002400730653002500754653002200779100002900801700002600830700001500856700001900871700001900890856013200909 2006 eng d a0272-884200aLiquid phase oxidation of alkanes using Cu/Co-perchlorophthalocyanine immobilized MCM-41 under mild reaction conditions0 aLiquid phase oxidation of alkanes using CuCoperchlorophthalocyan aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcJAN a220-2300 v2973 a

{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 [

10aCeramics10aElectron microscopy10aelectronic materials10aX-ray diffraction1 aKarandikar, Prashant, R.1 aChandwadkar, Asha, J.1 aAgashe, M.1 aRamgir, N., S.1 aSivasanker, S. uhttps://library.ncl.res.in/content/liquid-phase-oxidation-alkanes-using-cuco-perchlorophthalocyanine-immobilized-mcm-41-under-201818nas a2200253 4500008004100000022001400041245008200055210006900137260007300206300001200279490000800291520098200299653001401281653001201295653001801307653001801325653001801343653001301361100002301374700002201397700001701419700001901436856010901455 2007 eng d a0926-860X00aAcylation of anisole with long-chain carboxylic acids over wide pore zeolites0 aAcylation of anisole with longchain carboxylic acids over wide p aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcFEB a250-2570 v3173 a

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.

10aAcylation10aAnisole10adecanoic acid10ahexanoic acid10aoctanoic acid10azeolites1 aWagholikar, S., G.1 aNiphadkar, P., S.1 aMayadevi, S.1 aSivasanker, S. uhttps://library.ncl.res.in/content/acylation-anisole-long-chain-carboxylic-acids-over-wide-pore-zeolites01587nas a2200241 4500008004100000022001400041245007400055210006900129260007400198300001200272490000800284520081000292653001501102653001201117653001101129653001101140653001801151100001801169700001901187700001701206700001901223856010301242 2011 eng d a1878-519000aAlkylation of anisole with 1-hexene and 1-hexanol over zeolite H-beta0 aAlkylation of anisole with 1hexene and 1hexanol over zeolite Hbe aVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDSbSPRINGERcAUG a481-4910 v1033 a

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.

10aAlkylation10aAnisole10aH-beta10aHexene10aHexyl alcohol1 aSurse, P., V.1 aWagholikar, S.1 aMayadevi, S.1 aSivasanker, S. uhttps://library.ncl.res.in/content/alkylation-anisole-1-hexene-and-1-hexanol-over-zeolite-h-beta-000642nas a2200157 4500008004100000022001400041245009100055210006900146260007300215300000800288490000800296100002400304700001900328700002200347856011500369 2012 eng d a0920-586100aSpecial Issue dedicated to Paul Ratnasamy on the occasion of his 70th birthday preface0 aSpecial Issue dedicated to Paul Ratnasamy on the occasion of his aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcDEC a1-20 v1981 aReddy, Benjaram, M.1 aSivasanker, S.1 aRamaswamy, A., V. uhttps://library.ncl.res.in/content/special-issue-dedicated-paul-ratnasamy-occasion-his-70th-birthday-preface-001327nas a2200181 4500008004100000245007000041210006800111260000800179300001200187490000800199520078500207100001300992700002901005700002301034700001501057700001901072856005401091 2017 eng d00aHydrogenolysis of sorbitol over Ni, Pt and Ru supported on SBA-150 aHydrogenolysis of sorbitol over Ni Pt and Ru supported on SBA15 cFEB a226-2310 v56 3 aHydrogenolysis 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.1 aBanu, M.1 aSankaranarayanan, T., M.1 aVenuvanalingam, P.1 aMagesh, G.1 aSivasanker, S. uhttp://nopr.niscair.res.in/handle/123456789/4090304682nas a2200169 4500008004100000245009800041210006900139260000800208300001100216490000700227520406900234100003204303700002004335700002004355700001904375856011804394 2022 eng d00aSuitability of different supported Ru, Pt and Ni catalysts for the hydrogenolysis of sorbitol0 aSuitability of different supported Ru Pt and Ni catalysts for th cSEP a1005940 v153 a

 

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–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' 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' mixture increased the overall conversion and selectivities of the glycols, ethylene glycol (EG) and 1,2-propylene glycol (PG). The catalysts’ performance at 60 bar and 220 °C with the presence of base (B), evaluated by the yield of glycols (PG + EG), showed the following order:

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

Na–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.

 

 

1 aKandasamy, Thirunavukkarasu1 aBanu, Marimuthu1 aShanthi, Vijaya1 aSivasanker, S. uhttps://library.ncl.res.in/content/suitability-different-supported-ru-pt-and-ni-catalysts-hydrogenolysis-sorbitol