摘要
采用后合成法合成了ZSM-5–SBA-15微介孔复合分子筛,考察了m(ZSM-5)/m(SBA-15)、晶化时间、盐酸量、焙烧温度对烷基化催化性能的影响。在m(ZSM-5)/m(SBA-15)=0.2,晶化时间为18 h,盐酸量为20 m L,焙烧温度为550℃条件下,合成的复合分子筛催化剂的甲醇转化率为94.93%,对二甲苯选择性为45.46%。惰性SBA-15介孔分子筛抑制了ZSM-5外表面酸性,提高了对二甲苯的选择性。
The micro-mesoporous composite molecular sieves of ZSM-5–SBA-15 were synthesized via a post synthesis. The influences of mass ratio of ZSM-5/SBA-15, crystallization time, acid content and calcination temperature on the preparation of the composite molecular sieves were investigated. The ZSM-5–SBA-15 prepared at the mass ratio of ZSM-5/SBA-15 of 0.2, crystallization time of 18 h, acid content of 20 mL and calcination temperature of 550 ℃ has a conversion rate of methanol of 94.93%and a selectivity of para-xylene of 45.46%. The acidity on the surface of ZSM-5 is reduced by mesoporous molecular sieve of nonvalent SBA-15, thus improving the selectivity of para-xylene.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2015年第7期875-881,共7页
Journal of The Chinese Ceramic Society
