大孔磺酸树脂催化剂催化FCC汽油烷基化脱硫反应失活原因分析

Analysis of deactivation causes for macroporous sulfonic resin for alkylation desulfurization of FCC gasoline

采用"BA试验"方法进行大孔磺酸树脂催化剂催化FCC汽油烷基化脱硫反应的加速寿命试验考察;通过BET比表面积、非金属元素分析和FT-IR等分析技术研究烷基化脱硫催化剂失活的原因,并对失活催化剂浸取物进行分析。结果表明,经过多次深处理后,催化剂活性基本丧失。在反应过程中,烯烃低聚和芳烃烷基化等副反应生成的高分子有机副产物覆盖催化剂的活性中心以及碱性氮化物中和活性基团H+是造成催化剂活性降低的原因,并且高分子有机副产物覆盖催化剂的活性中心为主要原因。覆盖催化剂或堵塞孔道的物质主要由大量长链烷烃、少量长链烯烃和芳烃物等有机物组成。

The stability of macroporous sulfonic acid resin for alkylation desulfurization of FCC gasoline was investigated by‘BA test’. In order to find out the deactivation reasons for the catalysts,the catalysts before and after reaction were characterized by BET,nonmetallic elements analysis and FT-IR,and the extract from the deactivated catalyst was analyzed. The results showed that the catalyst activity was reduced after several times of deep treatments. During the reaction,the causes of catalyst activity reduction were that the activity centers of the catalyst were covered with the byproducts of olefins polymerization and aromatics alkylation and neutralization reaction of alkali nitrides with H^＋ of active group. The organics which covered the catalyst or plugged the pores consisted of a large number of long-chain alkanes and a＆amp;nbsp;small amount of long chain olefins and aromatic hydrocarbons.