金属羰基络合物制备的Pt-Re/Al_2O_3催化剂的性能 Ⅱ 不同方法制备的Pt-Re/Al_2O_3催化剂的物化性质表征  

CATALYTIC PERFORMANCE OF Pt-Re/Al_2O_3 CATALYSTS PREPARED FROM METAL CARBONYL COMPLEXES Ⅰ.PHYSICO-CHEMICAL PROPERTIES OF Pt-Re/Al_2O_3 CATALYSTS PREPARED BY DIFFERENT METHODS

作　　者：吴荣安[1] 王海增[1] 杜鸿章[1] 房廉清[1] 林励吾[1] 

机构地区：[1]中国科学院大连化学物理研究所,大连116023

出　　处：《Chinese Journal of Catalysis》1993年第5期338-342,共5页催化学报（英文）

基　　金：国家自然科学基金

摘　　要：采用TPR,H_2化学吸附,TPD,TEM和DRS等方法对一组组成相同制法不同的Pt-Re/Al_2O_3催化剂进行了表征。TPR,H_2化学吸附等结果表明,Pt-Re/Al_2O_3催化剂中Re是通过与Pt的相互作用形成有高温吸附H_2中心及抗积炭能力的Pt-Re集团,从而提高了重整催化剂的活性和稳定性。制备方法的不同对催化剂活性表面的形成及铂铼相互作用有重要影响。以羰基金属原子簇化合物制备的Pt_5Re_2催化剂的Pt和Re的相互作用程度最大,这种相互作用从TPR和DRS测定中得到验证。电镜观察发现Pt_5Re_2催化剂表面的金属晶粒分布比常规Pt-Re小且均匀。由于担载羰基化合物在脱羰过程中CO发生歧化生成的微量碳物类使Pt_5Re_2具有较好的活性、芳构化选择性和稳定性。The physico-chemical properties of a series of Pt-Re/Al2O3 catalysts with the same composition prepared by different methods have been characterized by means of TPR, H2 chemisorption, TPD, TEM and DRS. The TPR, H2-TPD and DRS results indicated that there was a stronger interaction between Pt and Re on the surface of the metal cluster Pt-Re/ A12O3 catalysts. Moreover, TEM determination showed that the metal cluster Pt-Re/Al2O3 catalysts possessed better metal crystallite homogeneity. These two factors together with the role of the surface carbon species formed during the decarbonylation of the supported metal carbo-nyl complexes make the catalytic performances of the metal cluster Pt-Re/Al2O3 catalysts better than those of the conventional Pt-Re/Al2O3 catalysts.

关 键 词：金属 羰基络合物 铂铼催化剂 制备 

分 类 号：O643.36[理学—物理化学]