Mo-V-Co-O催化剂的丙烷氧化脱氢性能研究

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-Co-O Catalysts

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.