改性CaTi_(0.9)Li_(0.1)O_3上乙烷催化氧化脱氢制乙烯的研究

Modified CaTi09Li01O3 catalysts for oxidative dehydrogenation of ethane to ethene

ＣａＴｉ０９Ｌｉ０１Ｏ３催化剂中添加ＣｅＯ２、Ｌａ２Ｏ３、Ｙ２Ｏ３、ＮｉＯ等金属氧化物可不同程度地改进催化剂性能，其中以ＮｉＯ／ＣａＴｉ０９Ｌｉ０１Ｏ３催化剂性能最佳，乙烯收率在７７５℃比ＣａＴｉ０９Ｌｉ０１Ｏ３作催化剂提高１２２％，适当控制反应条件，可使７７５℃的乙烷转化率达５５２％，乙烯选择性为７３％。ＮｉＯ／ＣａＴｉ０９Ｌｉ０１Ｏ３催化剂的最佳ＮｉＯ含量为３０％，最佳焙烧温度为８００℃，催化剂上乙烷氧化脱氢适宜的反应条件为，反应温度７７５～８００℃，Ｖ（Ｃ２Ｈ６）／Ｖ（Ｏ２）＝１７～２，原料气空速为（２～３）×１０４ｈ－１，原料气中惰性气体含量为２０％～５０％。

The performance of CaTi09Li01O3 catalyst can be improved further at 775 by addition of CeO2La2O3Y2O3NiO,respectively.Among these modified catalysts , NiO/ CaTi09Li01O3 catalyst has the best catalytic performances ,439% conversion of ethane ,735%selectivity to ethene and 322% yield of ethene. For NiO/ CaTi09Li01O3 catalyst ,the optimal calcination temperature is 800,and the best content of NiO is 30%(mass).In addition ,the results exhibit that the most suitable reaction conditions of ethane oxidative dehydrogenation to ethene over NiO/ CaTi09Li01O3 catalyst are 775800,172 molar ratio of C2H6 to O2, 2000030000h1space velocity and 20%50% inert gas in feed gases. 552% conversion of ethane and 73% selectivity to ethene can be obtained over NiO/ CaTi09Li01O3 catalyst under the conditions of 775.V(C2H6)/V(O2)=18,24000h1,40%He.