复合分子筛催化剂上C_9 芳烃脱烷基的研究

C_9 aromatics hydrodealkylation over composite zeolite catalyst

将Ni负载在H-ZSM-5和H-MOR分子筛催化剂上,以异丙苯为模型化合物对分子筛催化剂加氢脱烷基性能进行评价。考察了分子筛复配比例、金属含量和酸浓度对催化剂活性的影响。结果表明,酸处理后的分子筛催化剂,异丙苯转化率和苯、甲苯、二甲苯(BTX)的收率有明显提高。当反应温度为340℃、压力0.8 MP和空速1 h^(-1)时,其转化率为81.5%,BTX收率为72.8%,选择性可达89.2%。

Nickel was loaded over H-ZSM-5 and H-MOR and performance of the resultant catalysts for hydrodealkylation was investigated using isopropylbenzene （IPB） as the model compound. Influence of zeolite proportion, metal content and acid content on the catalytic activity was investigated. The results showed that IPB conversion, benzene, toluene mid xylene （BTX） yield were remarkably enhanced over Ni/（ H-ZSM-5 ＋ H-MOR） catalyst treated by acid. IPB conversion of 81.5%, BTX yield of 72.8% and selectivity to BTX of 89.2% were attained under the following condition ： 340 ℃, 0. 8 MPa, LHSV 1 h ^- 1.