二氯乙烷氧氯化再生高分散Pt/Al_(2)O_(3)丙烷脱氢催化剂  

Regeneration of highly dispersed Pt/Al_(2)O_(3)catalyst for propane dehydrogenation by dichloroethane oxychlorination

作　　者：陶明亮 赵方成 隋志军[1] 安霓虹 沈亚峰 周兴贵[1] TAO Mingliang;ZHAO Fangcheng;SUI Zhijun;AN Nihong;SHEN Yafeng;ZHOU Xinggui(School of Chemical Engineering,East China University of Science and Technology,State Key Laboratory of Chemical Engineering,Shanghai 200237,China;Sino-Platinum Industrial Catalyst(Yunnan)Co.,Ltd.,Yuxi 651100,China)

机构地区：[1]华东理工大学化工学院化学工程联合国家重点实验室,上海200237 [2]贵研工业催化剂(云南)有限公司,云南玉溪651100

出　　处：《石油化工》2024年第12期1695-1703,共9页Petrochemical Technology

基　　金：国家自然科学基金项目(22278130);云南省科技厅项目(202305AF150194)。

摘　　要：制备了高分散Pt/Al_(2)O_(3)丙烷脱氢催化剂,研究了以二氯乙烷作为氯分散剂氧氯化再生Pt基催化剂的工艺,采用XRD、CO化学吸附、HAADF-STEM和N_(2)吸附-脱附等方法表征了氧氯化处理前后催化剂结构,考察了温度、二氯乙烷进料速率、氧气含量以及氧氯化时间对再生催化剂性能的影响,并评价了催化剂在反应-再生循环过程中的稳定性。实验结果表明,二氯乙烷氧氯化处理可以使烧结的Pt/Al_(2)O_(3)催化剂达到亚纳米尺度的分散,当二氯乙烷进料速率为127μmol/min、氧气含量为12%(φ)、温度为500℃、氧氯化时间为60 min时氧氯化再生催化剂性能最佳,在此条件下Pt/Al_(2)O_(3)催化剂性能在多次反应-再生循环中保持稳定。The highly dispersed Pt/Al_(2)O_(3)catalyst for propane dehydrogenation was prepared,and the process of regenerating Pt-based catalysts by oxychlorination using dichloroethane as a chlorine dispersant was studied.The catalyst structure before and after oxychlorination treatment was characterized by XRD,CO chemical adsorption,HAADF-STEM,and N_(2)adsorption-desorption.The effects of temperature,dichloroethane feed rates,oxygen concentration,and oxychlorination time on the performance of the regenerated catalyst were investigated,and the stability of the catalyst during reaction-regeneration cycles was evaluated.The results indicate that Pt particles on the sintered Pt/Al_(2)O_(3)catalyst can be redispersed to sub-nano scales by dichloroethane oxychlorination treatment.The conditions to reach the optimal catalytic performance are dichloroethane feed rates of 127μmol/min,oxygen concentration of 12%(φ),temperature of 500℃,and oxycholorination time of 60 min.The performance of the Pt/Al_(2)O_(3)catalyst in these conditions remains stable during multiple reaction-regeneration cycles.

关 键 词：丙烷脱氢 Pt/Al_(2)O_(3)催化剂 二氯乙烷 再生 再分散 

分 类 号：TQ221.2[化学工程—有机化工]