Co改性多级孔Hβ分子筛的酰化反应工艺研究

Acylation catalyzed by Co modified hierarchical porous Hβ zeolite

以碱处理的多级孔Hβ分子筛为载体,采用浸渍法制备出Co改性多级孔Hβ分子筛。通过XRD,BET和Py-FTIR等表征手段对催化剂进行分析,可知改性后的催化剂仍是BEA晶体结构,且是具有微介孔结构的多级孔分子筛。Co的负载同时增加了L酸量和B酸量,提升了催化活性。以苯甲醚与乙酸酐酰化反应为探针,探究Co改性多级孔Hβ分子筛的酰化反应催化效果。结果表明:在Co负载量为5%,反应温度为120℃,催化剂用量2g,反应物摩尔比为1.5时,催化剂酰化反应效果最佳,此时乙酸酐转化率93.61%,选择性97.52%。

Co modified hierarchical porous Hβzeolite was obtained by impregnation of hierarchical porous Hβzeolite which was treated with alkaline solution.The catalysts were characterized by XRD,BET and Py-FTIR.The results show that the modified catalyst is still BEA Crystal structure and hierarchical porous zeolite with micro-mesoporous structures.The loading of Co increased both the amount of lewis acid and the amount of Bronsted acid,which increased the catalytic activity.The acylation reaction between anisole and acetic anhydride was used to investigate the catalytic effect of Co modified hierarchical porous Hβzeolite on acylation reaction.The results indicate that the catalyst has the best acylation reaction effect under the following experimental parameters:Co loading 5%,the reaction temperature 120℃,the catalyst dosage 2 g,and molar ratio of reactants 1.5,with the optimum anisole conversion of 93.61%and the selectivity of 97.52%.