Ni-H_3PW_(12)O_(40)/ZrO_2和Ni-Pt-H_3PW_(12)O_(40)/ZrO_2双功能催化剂的正戊烷异构化性能  

Isomerization of n-Pentane over Ni-H_3PW_(12)O_(40)/ZrO_2 and Ni-Pt-H_3PW_(12)O_(40)/ZrO_2 Bifunctional Catalysts

作　　者：许元栋[1,2] 张霞[1,2] 李红玲[1,2] 齐彦兴[1] 吕功煊[1] 李树本[1] 

机构地区：[1]中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室,甘肃兰州730000 [2]中国科学院研究生院,北京100049

出　　处：《石油化工》2009年第1期5-9,共5页Petrochemical Technology

摘　　要：用分步浸渍法制备了ZrO2负载的Ni-H3PW12O40(TPA)和Ni-Pt-TPA金属-酸性位双功能催化剂,用X射线衍射和傅里叶变换红外光谱对其进行了表征。以正戊烷为模型化合物,在常压临氢条件下考察了催化剂的异构化性能及还原温度和反应温度的影响。实验结果表明,Ni/ZrO2催化剂主要表现出氢解活性,产物为甲烷;向Ni/ZrO2中加入TPA后,Ni-TPA/ZrO2催化剂具有异构化作用,且随TPA含量的增加异构化能力逐渐增强,当Ni-TPA/ZrO2中Ni和TPA的质量分数分别为8%和30%时,催化剂的异构化效果较佳;向Ni-TPA/ZrO2中加入质量分数0.5%的Pt时,Ni-Pt-TPA/ZrO2催化剂的活性和选择性显著增加。Two kinds of ZrO2 supported Ni-H3PW12O40（TPA） and Ni-Pt-TPA metal-acid bifunctional catalysts were prepared by conventional stepwise impregnations and were characterized by means of XRD and FFIR. n-Pentane was selected as model compound and was isomerized in hydrogen atmosphere to evaluate activities of the catalysts. The effects of reduction temperature and reaction temperature on activities of the catalysts were also investigated. Ni/ZrO2 shows strong hydrogenolysis activity to n-pentane and its isomerization activity appears only after addition of TPA to the catalyst. The catalytic isomerization activity is promising when the loading mass fraction of Ni and TPA are 8 % and 30% （mass fraction） in Ni-TPA/ZrO2 ,respectively. Adding 0.5% （mass fraction） of Pt to Ni- TPA/ZrO2 catalyst, both conversion of n-pentane and selectivity to desired product increase evidently.

关 键 词：磷钨酸 氧化锆 镍 铂 双功能催化剂 正戊烷 异构化 

分 类 号：TQ203.4[化学工程—有机化工]