%0 Journal Article
%T 铂和HF掺杂的H-ZSM-5分子筛催化甲苯与甲醇烷基化反应
%J 催化学报
%P 1209-1216
%D 2010
%X ？Toluenewasalkylatedwithmethanolinaflowtypereactorattemperaturesbetween300and500°CusingH-ZSM-5zeolite,0.2%Pt/H-ZSM-5andhydrofluorinated0.2%Pt/H-ZSM-5withHFconcentrationsof1.0%,2.0%,3.0%,or4.0%.Ptprimarilyenhancestolueneconversion,totalxylenesproduction,andp-xylenerelativetoitsthermodynamicequilibrium.AstheconcentrationofHFincreasesfrom1.0%to3.0%,thecatalystactivityincreasesbecauseoftheincreaseinthenumberofacidsitesandtheirstrength.Additionally,thesurfaceareaandPtdispersionalsoincreases.AnadvantageofincreasedHFdopingisthattheformationofvoluminoustrimethylbenzene(TMB)byproductsisinhibited.However,ataHFconcentrationof4.0%,AlandSiarepartiallyleachedandthendepositedmostlyinthewidercatalyticpores.Thiswasdeterminedbyevaluatingtheporevolumedistributionandwedeterminedthatreactivityinhibitionwasob-viouslypresentandwasduetodiffusionrestriction.
%K methanol
%K toluene
%K alkylation
%K platinum
%K hydrofluorination
%K shape-selectivity
%K ZSM-5
%U http://www.chxb.cn/CN/abstract/abstract20225.shtml