02318nas a2200253   4500008004100000022001400041245009700055210006900152260007300221300001200294490000800306520143100314653001501745653002301760653001101783653001901794653001301813100001501826700002201841700002201863700002601885700002801911856012501939       2005                        eng d  a1381-116900aLiquid-phase alkylation of phenol with long-chain olefins over WOx/ZrO2 solid acid catalysts0 aLiquidphase alkylation of phenol with longchain olefins over WOx  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcOCT  a123-1310 v2403 a<p>The liquid-phase alkylation of phenol with 1-dodecene was carried out over WOx/ZrO2 solid acid catalysts. The catalysts were prepared by wet impregnation method using zirconium oxyhydroxide and ammonium metatungstate. Catalysts with different WO3 loading (5-30 wt.%) were prepared and calcined at 800 degrees C and catalyst with 15% WO3 was calcined from 700-850 degrees C. All the catalysts were characterized by surface area, XRD, and FTIR. The catalyst with 15% WO3 calcined at 800 degrees C (15 WZ-800) was found to be the most active in the reaction. The effect of temperature, molar ratio and catalyst weight on dodecene conversion and products selectivity was studied in detail. Under the optimized reaction conditions of 120 degrees C, phenol/1-dodecene molar ratio 2 and time 2 h, the catalyst 15 WZ-800 gave &gt; 99% dodecene conversion with 90% dodecylphenol selectivity. Comparison of the catalytic activity of 15 WZ-800 with sulfated zirconia calcined at 500 degrees C (SZ-500) and HP zeolite showed that activity of SZ-500 was lower than that of 15 WZ-800, while HP zeolite showed negligible activity. It is observed that the presence of water in the reaction mixture was detrimental to the catalytic activity of WOx/ZrO2. The catalyst 15 WZ-800 also found to be an efficient catalyst for alkylation of phenol with long-chain olefins like 1-octene and 1-decene. (c) 2005 Elsevier B.V. All rights reserved.</p>10aAlkylation10along-chain olefins10aphenol10atungsten oxide10aZirconia1 aSarish, S.1 aDevassy, Biju, M.1 aBohringer, Walter1 aFletcher, Jack, C. Q.1 aHalligudi, Shivaraj, B.  uhttps://library.ncl.res.in/content/liquid-phase-alkylation-phenol-long-chain-olefins-over-woxzro2-solid-acid-catalysts-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