CAJ | 학술논문

在N2流中不同温度（20～300℃）下对固体酸催化剂进行热处理，然后进行N H3程序升温脱附酸性表征和持续90 d的重整芳烃脱烯烃反应实验，以研究催化剂失活动力学。结果表明，烯烃转化率均随着反应时间的延长而逐渐降低，催化剂结焦失活；催化剂热处理温度越高，其脱烯烃催化活性越低，活性稳定性越高。催化剂表面具有酸强度分布较窄的弱酸中心，随着催化剂处理温度提高，其表面酸密度逐渐降低，酸强度逐渐提高。催化剂表面酸密度越大和酸强度越高，其脱烯烃催化活性越高，而活性稳定性越差。300℃处理催化剂的活性稳定性较高，经90 d持续反应，烯烃转化率从91.4％降至85.8％。
재N2류중불동온도（20～300℃）하대고체산최화제진행열처리，연후진행N H3정서승온탈부산성표정화지속90 d적중정방경탈희경반응실험，이연구최화제실활동역학。결과표명，희경전화솔균수착반응시간적연장이축점강저，최화제결초실활；최화제열처리온도월고，기탈희경최화활성월저，활성은정성월고。최화제표면구유산강도분포교착적약산중심，수착최화제처리온도제고，기표면산밀도축점강저，산강도축점제고。최화제표면산밀도월대화산강도월고，기탈희경최화활성월고，이활성은정성월차。300℃처리최화제적활성은정성교고，경90 d지속반응，희경전화솔종91.4％강지85.8％。
The solid acid catalyst was treated in N2 flow at the temperature ranged from 20℃ to 300℃ and characterized by temperature programmed desorption of NH3 .The reaction experiments for the removal of trace olefins from reforming aromatic hydrocarbons were carried out in a fix‐bed reactor for time on streams of 90 d with the catalyst treated at different temperatures . The deactivation kinetics of the catalyst was studied synchronously . The results indicated that the olefins conversion decreased and the catalyst deactivated by coke with the increase of time on stream .With the increase of heat‐treatment temperature of catalyst , the activity stability of the catalyst became better and catalytic activity for the removal of trace olefins went lower .There were the weak acid sites with narrow acid strength distribution over the catalyst surface . With the increase of heat‐treatment temperature of catalyst , the surface acid density of the catalyst reduced and the acid strength enhanced .The catalyst with larger acid density and higher acid strength over the surface exhibited the better catalytic activity and poor activity stability .The catalyst treated in N2 flow at 300℃ had better activity stability with the olefins conversion decreased from 91.4% to 85.8% through time on stream for 90 d .