不同烷基链磷酸酯对SAPO-11分子筛物化性质及其催化临氢异构化性能的影响

发布时间：2018-04-10 04:07

本文选题：SAPO-分子筛　切入点：烷基链　出处：《石油学报(石油加工)》2017年05期

【摘要】：在SAPO-11分子筛溶胶体系中引入不同烷基链有机磷酸酯,合成系列SAPO-11分子筛,研究不同烷基链对SAPO-11分子筛物化性质及其催化正辛烷临氢异构化性能的影响。结果表明,与常规合成方法相比,加入烷基有机磷酸酯可以缩小SAPO-11分子筛粒径,提高分子筛的比表面积、孔容与酸量。随着有机磷酸酯烷基链长的增加,SAPO-11分子筛的粒径先减小后增大,而比表面积、孔容和酸量先增大后减小。加入十二烷基有机磷酸酯合成的SAPO-11-D分子筛具有最小的粒径、最大的比表面积、孔容和最高的酸量。正辛烷临氢异构化反应结果表明,Pt/H-SAPO-11-D催化剂比Pt/H-SAPO-11-N具有更优的异构化活性、更高的双甲基异构体选择性及更低的裂解产物选择性。
[Abstract]:A series of SAPO-11 molecular sieves were synthesized by introducing different alkyl chain organophosphates into the sol system of SAPO-11 molecular sieves. The effects of different alkyl chains on the physicochemical properties of SAPO-11 molecular sieves and their catalytic properties of n-octane hydroisomerization were studied.The results show that the addition of alkyl organophosphate can reduce the particle size of SAPO-11 molecular sieve and increase the specific surface area, pore volume and acid content.With the increase of alkyl chain length of organophosphate, the particle size of SAPO-11 molecular sieve decreases first and then increases, while the specific surface area, pore volume and acid content increase first and then decrease.The SAPO-11-D molecular sieve synthesized by the addition of dodecyl organophosphate has the smallest particle size, the largest specific surface area, the highest pore volume and the highest acid content.The results of n-octane hydroisomerization show that Pt- / H-SAPO-11-D catalyst has better isomerization activity, higher dimethyl isomerization selectivity and lower cleavage product selectivity than Pt/H-SAPO-11-N.
【作者单位】：中海油天津化工研究设计院有限公司;天津市炼化催化技术工程中心;
【基金】：中国海油总公司“十二五”重大科技项目(CNOOC-KY125ZDXM26TJY03TJY2014-03)资助
【分类号】：TE624.9

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