02208nas a2200241   4500008004100000022001400041245009900055210006900154260007300223300001200296490000800308520132100316653003001637653002301667653002501690653001301715100002201728700001701750700002201767700002601789700002801815856012301843       2005                        eng d  a1381-116900aSynthesis of linear alkyl benzenes over zirconia-supported 12-molybdophosphoric acid catalysts0 aSynthesis of linear alkyl benzenes over zirconiasupported 12moly  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUL  a162-1670 v2363 a<p>The liquid-phase alkylation of benzene with 1-octene and 1-dodecene was investigated using zirconia-supported 12-molybdophosphoric acid (MPA) as catalyst. The catalysts with different MPA loading (5-25 wt.% calcined at 700 degrees C) and calcination temperature (15 wt.% calcined from 500 to 750 degrees C) were prepared by suspending zirconium oxyhydroxide in methanol solution of MPA followed by drying and calcination. These catalysts were characterized by X-ray diffraction, and P-31 MAS NMR spectroscopy measurements. The XRD results indicated that MPA stabilizes the tetragonal phase of zirconia. 3 1 P MAS NMR spectra show that the nature of phosphorous species depend on MPA loading and calcination temperature, and it show the existence of three types of phosphorous species, one is the Keggin unit and the other is the decomposition product of MPA and third one an unidentified species. FTIR pyridine adsorption on 15% MPA catalyst calcined at 700 degrees C showed the presence both Bronsted and Lewis acidity. Under the reaction conditions of 83 C, benzene/1-olefin molar ratio of 10 (time, 1 h), the most active catalyst, 15% MPA calcined at 700 C gave more than 90% olefin conversion with selectivity to 2-phenyl octane, 55% and 2-phenyl dodecane, 45%. (c) 2005 Elsevier B.V. All rights reserved.</p>10a12-molybdophosphoric acid10abenzene alkylation10alinear alkyl benzene10aZirconia1 aDevassy, Biju, M.1 aLefebvre, F.1 aBohringer, Walter1 aFletcher, Jack, C. Q.1 aHalligudi, Shivaraj, B.  uhttps://library.ncl.res.in/content/synthesis-linear-alkyl-benzenes-over-zirconia-supported-12-molybdophosphoric-acid-002264nas a2200217   4500008004100000022001400041245008600055210006900141260007300210300001200283490000800295520148700303653003001790653001101820653002001831653001301851100002201864700001901886700002001905856012101925       2006                        eng d  a1381-116900aPhenol tert-butylation over zirconia-supported 12-molybdophosphoric acid catalyst0 aPhenol tertbutylation over zirconiasupported 12molybdophosphoric  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR  a162-1700 v2473 a<p>The alkylation of phenol with tert-butanol was investigated using zirconia-supported 12-molybdophosphoric acid (MPA) as catalyst. The catalysts with different MPA loading (5-25 wt.% calcined at 700 degrees C) and calcination temperature (15 wt.% calcined from 500 to 750 degrees C) were prepared by suspending zirconium oxyhydroxide in methanol solution of MPA followed by drying and calcination. These catalysts were characterized by X-ray diffraction and (31)p MAS NMR spectroscopy measurements. The XRD results indicated that MPA stabilizes the tetragonal phase of zirconia. (31)p MAS NMR spectra showed the presence of three types of phosphorous species, phosphomolybdate in interaction with zirconia, decomposition product of MFPA and an unidentified species. IFTIR pyridine adsorption on 15% MPA catalyst calcined at different temperatures showed the presence of both Bronsted and Lewis acidity and the catalyst calcined at 700 degrees C showed the highest relative Bronsted acidity. Under the reaction conditions of 140 degrees C, tert-butanol/phenol molar ratio of 2 and LHSV of 4 h(-1), the phenol conversion was 80.6% at 2 h (selectivity to 2-TBP 11.5%, 2,4-DTBP 55.2%, and 4-TBP 25.7%), which decreased slowly with time and at 31 h, it was 58.5% (selectivity to 2-TBP 15.2%, 2,4-DTBP 41.6%, and 4-TBP 38.4%). The major reason for the catalyst deactivation was the reduction and leaching of MPA from the catalyst surface. (c) 2005 Elsevier B.V. All rights reserved.</p>10a12-molybdophosphoric acid10aphenol10atert-butylation10aZirconia1 aDevassy, Biju, M.1 aShanbhag, G.V.1 aHalligudi, S.B.  uhttps://library.ncl.res.in/content/phenol-tert-butylation-over-zirconia-supported-12-molybdophosphoric-acid-catalyst