Production of Light Olefins from Biosyngas by Two-stage Catalytic Conversion Process via Dimethyl Ether  

生物质气经由二甲醚两步法制备低碳烯烃

作　　者：李宇萍[1] 涂军令[1,2] 王铁军[1] 马隆龙[1] 张兴华[1] 章青[1] 蔡炽柳[1] 

机构地区：[1]中国科学院广州能源研究所可再生能源重点实验室,广州110640 [2]中国科学院大学,北京100049

出　　处：《Chinese Journal of Chemical Physics》2014年第2期227-232,I0004,共7页化学物理学报（英文）

基　　金：ACKNOWLEDGM ENTS This work was supported by the National Natural Science Foundation of China （No.51006110, No.51276183, and No.51036006）, the National Natural Research Foundation of China/Japan Science and Technology Agency （No.51161140331）, and National Key Basic Research Program 973 Project Founded by MOST of China （No.2013CB228105）.

摘　　要：NiSAPO-34 and NiSAPO-34/HZSM-5 were prepared and evaluated for the performance of dimethyl ether （DME） conversion to light olefins （DTO）. The processes of two-stage light olefin production, DME synthesis and the following DTO, were also investigated using biosyngas as feed gas over Cu/Zn/A1/HZSM-5 and the optimized 2%NiSAPO-34/HZSM- 5. The results indicated that adding 2%Ni to SAPO-34 did not change its topology structure, but resulted in the forming of the moderately strong acidity with decreasing acid amounts, which slightly enhanced DME conversion activity and C2=-C3= selectiw ity. Mechanically mixing 2%NiSAPO-34 with HZSM-5 at the weight ratio of 3.0 further prolonged DME conversion activity to be more than 3 h, which was due to the stable acid sites from HZSM-5. The highest selectivity to light olefins of 90.8% was achieved at 2 h time on stream. The application of the optimized 2%NiSAPO-34/HZSM-5 in the second-stage reactor for DTO reaction showed that the catalytic activity was steady for more than 5 h and light olefin yield was as high as 84.6 g/m3syngas when the biosyngas （H2/CO/CO2/N2/CH4=41.5/26.9/14.2/14.6/2.89, vol%） with low H/C ratio of 1.0 was used as feed gas.

关 键 词：Light olefins Two-stage conversion Dimethyl ether Biosyngas NiSAPO-34/HZSM-5 

分 类 号：R-33[医药卫生]