碱改性HZSM-5催化热解木质素催化剂失活分析  

Deactivation analysis of catalyst for modified HZSM-5 catalytic lignin pyrolysis

作　　者：唐松山 泮泽优 张长森[1,3] 王登台 薛翔飞 曹云峰 刘永刚 张瑞芹[1,3] 

机构地区：[1]郑州大学化学与分子工程学院,河南郑州450001 [2]天方药业有限公司,河南驻马店463000 [3]河南省环境化学与低碳技术重点实验室,河南郑州450001

出　　处：《化工学报》2017年第12期4739-4749,共11页CIESC Journal

基　　金：河南省国际合作基金项目(172102410041)~~

摘　　要：对0.3 mol·L-1 Na OH改性后的HZSM-5以及未改性HZSM-5催化剂进行循环和再生评价实验以考察催化剂的寿命。对反应后和再生的催化剂进行N2吸脱附以及NH3-TPD表征,并通过对反应后的催化剂进行SEM、TGA、FTIR、UV-Vis等表征分析催化剂积炭。两种催化剂的活性均随着循环实验次数的增加而逐渐降低,经4次循环实验的改性HZSM-5催化剂的催化活性远高于4次循环实验的未改性HZSM-5催化剂。反应过的催化剂经高温煅烧再生后其活性都有所恢复,再生后的改性HZSM-5的催化活性仍高于未改性催化剂。对两种不同催化剂积炭分析,改性后催化剂的积炭量少于未改性的催化剂,其积炭组分中高聚芳烃的含量相对较多。The circulation and regeneration experiments were employed to evaluate the lifetime of the two different catalysts（HZSM-5 and 0.3 mol·L-1 Na OH modified HZSM-5）. The spent and regenerated catalysts were characterized by N2 adsorption-desorption and NH3-TPD techniques to analyse the reason of deactivation, and the spent catalysts were characterized by SEM,TGA, FTIR and UV-Vis techniques to analyse the coke deposited on the catalyst. The deactivation of the two different zeolites was become more and more serious along with the increase of the number of cycles. The difference was that the performance of 0.3 mol·L-1 Na OH modified HZSM-5 was better than the one of unmodified HZSM-5 after four cycles. The coke of the spent catalysts was removed through calcination in air at high temperature and the catalytic activity was recovered to a large extent. The performance of 0.3 mol·L-1 Na OH modified HZSM-5 was still better than the one of unmodified HZSM-5 after regeneration. The amount of coke deposited on the modified HZSM-5 was less than the one of unmodified HZSM-5. The coke of the modified HZSM-5 contains more condensed aromatics relatively.

关 键 词：HZSM-5分子筛 催化热解 木质素 失活 再生 积炭 

分 类 号：TQ032.4[化学工程]