02285nas a2200241   4500008004100000022001400041245011700055210006900172260007300241300001200314490000800326520138900334653003601723653001501759653001201774653002301786100002001809700002201829700002201851700001801873700002801891856012401919       2006                        eng d  a1381-116900aShape selective synthesis of long-chain linear alkyl benzene (LAB) with AIMCM-41/beta zeolite composite catalyst0 aShape selective synthesis of longchain linear alkyl benzene LAB   aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUL  a239-2440 v2533 a<p>The liquid-phase alkylation of benzene with long-chain olefins such as 1-decene, 1-octene and 1-dodecene was carried out over AIMCM-41/Beta zeolite composite material as catalyst. The catalyst was prepared by seeding method and characterized by XRD, N-2 sorption, FTIR pyridine adsorption, NH3-TPD and SEM. Powder XRD of AlMCM-41/Beta zeolite composite material showed the co-existence of well-structured microporous and mesophase of AlMCM-41. The typical textural characteristics of micro- and meso-structured phases were observed in the composite material. The effect of temperature, reactant molar ratios and catalyst weight on 1-dodecene conversion and products selectivity was studied. The composite catalyst was found to be the highly selective towards the formation 2-dodecylbenzene. Under the reaction conditions of 120 degrees C, benzene/1-dodecene molar ratio 10 and time 2h, the catalyst gave 48% dodecene conversion with 76%, 2-dodecylbenzene selectivity. Significant improvement in catalytic activity has been achieved by composite material as compared to Al-MCM-41. Although zeolite beta and composite material gave similar conversion of dodecene, the composite material showed higher selectivity towards 2-dodecylbenzene, which could be due to higher diffusibility of 2-dodecylbenzene isomer in the composite material. (c) 2006 Elsevier B.V. All rights reserved.</p>10aAIMCM-41/beta zeolite composite10aAlkylation10aBenzene10along-chain olefins1 aBordoloi, Ankur1 aDevassy, Biju, M.1 aNiphadkar, P., S.1 aJoshi, P., N.1 aHalligudi, Shivaraj, B.  uhttps://library.ncl.res.in/content/shape-selective-synthesis-long-chain-linear-alkyl-benzene-lab-aimcm-41beta-zeolite-002266nas a2200277   4500008004100000022001400041245013300055210006900188260007300257300001000330490000800340520126100348653002401609653001501633653002301648653001301671100001901684700002001703700002101723700002301744700001701767700002201784700002601806700002801832856012801860       2009                        eng d  a0926-860X00aComparative study on liquid phase alkylation of 2-methylnaphthalene with long chain olefins using different solid acid catalysts0 aComparative study on liquid phase alkylation of 2methylnaphthale  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJAN  a74-800 v3523 a<p>A comparative study has been made over a variety of solid acid catalysts, which include isopoly and heteropoly ions supported on various supports such as zirconia, titania, a large variety of zeolites and a couple of mesoporous materials for liquid phasealkylation of 2-methylnaphthalene with 1-octene.All the catalyst systems were characterized by nitrogen sorption analysis, X-ray diffraction and NH(3)-TPD. Inspite of their high acid amounts zeolites gave poor catalytic performance due to their diffusional constraints; on the other hand mesoporous materials lacked diffusional constraints but due to their low acid amounts resulted in poor conversions. lsopoly and heteropoly ions supported on zirconia and titania were found to be catalytically active for the reaction due to total surface acidity. Among them, isopolytungstate supported on zirconia exhibited the best catalytic activity and was used for further optimization of reaction conditions. Excellent conversions of all olefins (&gt;92%) with high selectivity of monoalkylmethylnaphthalene (&gt;95%) was obtained under optimized reaction conditions. The catalyst could be recycled for several times without any obvious loss of its activity. (C) 2008 Elsevier B.V. All rights reserved.</p>10a2-Methylnaphthalene10aAlkylation10aLong chain olefins10aZirconia1 aLucas, Nishita1 aBordoloi, Ankur1 aAmrute, Amol, P.1 aKasinathan, Palraj1 aVinu, Ajayan1 aBohringer, Walter1 aFletcher, Jack, C. Q.1 aHalligudi, Shivaraj, B.  uhttps://library.ncl.res.in/content/comparative-study-liquid-phase-alkylation-2-methylnaphthalene-long-chain-olefins-using-0