Mo-V-Co-O催化剂的丙烷氧化脱氢性能研究  

The Oxidation Dehydrogenation of Propane over Mo-V-Co-O Catalysts

作　　者：韩智三[1] 伊晓东[1] 林洪[1] 何益明[1] 黄传敬[1] 翁维正[1] 万惠霖[1] 

机构地区：[1]厦门大学化学系

出　　处：《厦门大学学报（自然科学版）》2005年第1期67-70,共4页Journal of Xiamen University：Natural Science

基　　金：国家重点基础研究发展规划项目(G1999022408)

摘　　要：考察Mo2V1M0.5Ox(M=Co,Zr,Nb,Bi,Ni,Fe,Mn,Al,Sb,P,Nd,Te)系列催化剂的丙烷氧化脱氢性能,其中,添加Co的催化剂表现出较好的催化活性和丙烯选择性.对催化剂的BET,XRD,H2 TPR和NH3 TPD表征结果表明,Co元素的添加,改变了催化剂的物相组成,氧化还原性和酸碱性质,从而提高了Mo2V1Co0.5Ox 催化剂的丙烷氧化脱氢性能.The oxidation dehydrogenation of propane over Mo-V-O catalyst promoted with M(M=Co,Zr,Nb,Bi,Ni,Fe,Mn,Al,Sb,P,Nd,Te)was studied.Due to high catalytic activity and selectivity to propene over Mo_2V_1Co_(0.5)O_x catalyst,a detailed study on the promotion affect of Co on Mo-V mixed oxide catalyst in the oxidation dehydrogenation of propane to propene was performed.In order to establish the relationship between the catalytic performance and properties,the properties of Mo_2V_1O_x and Co-doped Mo_2V_1O_x catalysts have been comparatively characterized by BET,XRD,H_2-TPR and NH_3-TPD.Results of XRD characterization showed that Mo_2V_1O_x catalyst was composed of Mo_6V_9O_(40) and MoO_3,while Mo_2V_1Co_(0.5)O_x catalyst was composed of Mo_4V_6O_(25) and CoMoO_4.These changes in structures and thus the improvement in reducibility of MoPO/SiO_2 catalyst may be responsible for the increase in propane conversion.On the other hand, the NH_3-TPD results showed that the acid sites on the surface of Mo_2V_1O_x sample were stronger than those on Co-doped sample.These changes in acid-basic properties facilitate desorption of propene,preventing its further oxidation on the surface to CO_x.Such modification improved the catalytic performance of the catalyst in the oxidation dehydrogenation of propane to propene.

关 键 词：催化剂 氧化脱氢 丙烷 性能研究 丙烯 添加 TPR NH3-TPD 氧化还原性 BET 

分 类 号：O643[理学—物理化学] TQ221[理学—化学]