摘要
采用N 2吸附-脱附、X射线衍射、NH 3程序升温脱附、吡啶吸附红外光谱方法对工业新鲜、失活及再生C_(8)+芳烃脱烯烃催化剂的孔结构、晶相结构及表面酸性质进行了对比分析,采用热重分析、^(13)C核磁共振方法对工业失活催化剂进行了分析表征,采用红外光谱分析了失活催化剂甲苯-乙醇洗涤液中的有机物组成;以催化重整C_(8)+芳烃为原料对工业新鲜、失活及再生催化剂进行了脱烯烃活性评价。结果表明:与新鲜催化剂相比,失活催化剂的比表面积与孔体积大幅度下降,平均孔径增大,总酸量下降,B酸和L酸酸量明显下降;造成脱烯烃催化剂失活的主要原因是催化剂表面及孔道中的积炭(结焦),积炭(结焦)以芳烃缩合结焦为主,烯烃缩合结焦为辅;催化剂再生后,比表面积、孔体积、总酸量以及B酸、L酸酸量基本恢复至新鲜催化剂水平,脱烯烃初活性恢复至96%。
The pore structure,crystal structure and surface acid properties of commercial fresh,deactivated and regenerated catalysts for olefin removal were studied by means of N 2 adsorption-desorption,XRD,NH 3-TPD and Py-IR,the commercial deactivated catalyst were characterized by TG and ^(13)C NMR,and the organic composition in toluene-ethanol washing solution of deactivated catalyst was analyzed by FT-IR.The deolefinization activity of commercial fresh,deactivated and regenerated catalysts was evaluated by using catalytic reforming C_(8)+aromatics as raw materials.The results showed that the specific surface area and pore volume of the deactivated catalyst decreased significantly,the average pore size increased,the total acid content decreased,and the acid strength of B acid and L acid decreased significantly.The main cause of deactivation of the deolefinization catalyst was the carbon(coke)deposited on the surface and in the pores of the catalyst.The carbon(coke)was mainly formed by the condensation of aromatics and assisted by the condensation of olefin.After regeneration,the specific surface area,pore volume,total acid amount,B acid and L acid amount recovered basically to the level of fresh catalyst,and the initial deolefinization activity restored to 96%.
作者
张孔远
马亮
张唯稚
黄仁强
崔孟达
Zhang Kongyuan;Ma Liang;Zhang Weizhi;Huang Renqiang;Cui Mengda(State Key Laboratory of Heavy Oil Processing,China University of Petroleum,CNPC Key Laboratory of Catalysis,Qingdao,Shandong 266580;Qingdao Huicheng Environmental Technology Co.,Ltd.)
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2023年第5期42-47,共6页
Petroleum Processing and Petrochemicals
