分子筛催化剂上萘与2-丁烯的烷基化反应

Alkylation of Naphthalene with 2-Butene over Zeolite Catalysts

以HUSY和Hβ分子筛、H型脱铝丝光沸石以及Mg2+改性的USY分子筛(Mg-USY)为催化剂,通过XRD,NH3-TPD,BET方法对其结构及性能进行了表征,并考察了它们在萘与2-丁烯烷基化反应中的活性。实验结果表明,Mg-USY催化剂由于酸量和孔径减小,减少了副反应的发生,提高了反应的选择性。Mg2+浸渍量为81.25 mmol(基于100 g催化剂)的MgUSY-2催化剂对该反应的催化性能最佳,适宜的反应条件为:反应温度200℃,反应压力2 MPa,反应时间4 h,n(萘)∶n(2-丁烯)∶n(正己烷)=1∶0.2∶25,m(萘)∶m(催化剂)∶m(无水硫酸钠)=25.64∶0.5∶3。在此条件下,2-丁烯的转化率达92.33%,目的产物2-仲丁基萘的选择性达99.70%。

Zeolites HUSY, HI3, HM and Mg-USY（USY modified with Mg2＋） as catalysts were used in the alkylation of naphthalene and 2-butene, and characterized by means of XRD, NH3- TPD and BET. The effects of reaction time, temperature, ratio of naphthalene to 2-butene and Mg2＋ modification on the conversion of 2-butene and the selectivity to 2-sec-butylnaphthalene（2-SBN） over Mg-USY were studied. The results showed that the Mg2＋ modification decreased the pore diameter and total acid amount of HUSY which led to increasing the selectivity to 2-SBN and decreasing side reactions. Under the optimum conditions of Mg-USY-2 as catalyst with Mg2＋ loading 81.25 mmol（based on 100 g catalyst）, 200 ℃, 2 MPa, 4 h, n（naphthalene） ： n（2-butene） ： n（hexane） 1 ： 0.2 ： 25 and re（naphthalene） ： re（catalyst） ： re（anhydrous NazSO4） 25.64 ： 0.5 ： 3, the conversion of 2-butylene and the selectivity to 2-SBN reached 92.33% and 99.70%, respectively.