Zr、Cr改性CeO_2/Al_2O_3催化剂CO_2氧化乙苯脱氢反应研究  

Study of oxidative dehydrogenation of ethylbenzene with CO_2 over Zr and Cr modified CeO_2/Al_2O_3 catalysts

作　　者：孙超 冀德坤[1] 易玉峰[1] 丁福臣[1] 刘多强[2] Sun Chao;Ji Dekun;Yi Yufeng;Ding Fuchen;Liu Duoqiang(Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology,Beijing Institute of Petrolchemical Technology,Beijing 102617,China;Aviation Oil Research Institute o f the Chinese People ＊s Liberation Army,Beijing 100076,China)

机构地区：[1]北京石油化工学院燃料清洁化及高效催化减排技术北京市重点实验室,北京102617 [2]中国人民解放军空军油料研究所,北京100076

出　　处：《石油化工》2018年第6期523-528,共6页Petrochemical Technology

基　　金：国家科技支撑计划项目(2015BAK16B03);北京石油化工学院研究生创新活动计划项目(15033981002/072);大学生研究训练项目(2017J00082)

摘　　要：采用沉淀法制备了Zr、Cr掺杂的CeO_2/Al_2O_3催化剂,利用BET,XRD,SEM,H_2-TPR等技术手段对催化剂进行了表征,考察了CO_2气氛下改性催化剂的乙苯氧化脱氢性能。表征结果显示,Cr改性后,催化剂的比表面积明显降低,团聚现象严重,反应后催化剂的积碳率较高,催化剂失活较快;Zr改性后,Zr进入Ce晶格中形成CeO_2-ZrO_2固溶体,改善了催化剂的烧结现象,催化剂的比表面积和还原性稍有降低,但热稳定性增强,对抑制积碳有积极作用。实验结果表明,Cr最佳负载量为3%(w),Zr最佳负载量为10%(w),Zr改性的催化剂在长时间的反应中具有更好的催化性能。Zr and Cr doped CeO2/Al2O3 catalysts were prepared by a precipitation method. The catalysts were characterized by technical means such as BET,XRD,SEM and H2-TPR,and the performance of the modified catalysts in oxidative dehydrogenation of ethylbenzene with CO2 was evaluated. The characterization results showed that the Cr modified catalyst had significantly decreased specific surface area and become seriously agglomerated,and after reaction,the catalyst was relatively high in coke deposition rate,relatively fast in deactivation. Moreover,after modification with Zr,the Zr would enter into Ce lattices to form CeO2-ZrO2 solid solution,thereby improving the sintering of the catalyst. Additionally,the catalyst had slightly reduced specific surface area and reducibility and enhanced thermal stability,thus playing a positive role in inhibiting coke deposition. The experimental results showed that the optimal loadings of Zr and Cr were 10%（w） and 3%（w）,respectively,and the Zr modified catalyst had better catalytic performance in long-term reaction.

关 键 词：乙苯氧化脱氢 铈锆固溶体 CO2 积碳 

分 类 号：TQ032[化学工程]