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Production of Light Olefins from Biosyngas by Two-stage Catalytic Conversion Process via Dimethyl Ether
Yu-ping Li,Jun-ling Tu,Tie-jun Wang*,Long-long Ma*,Xing-hua Zhang,Qing Zhang,Chi-liu Cai
Author NameAffiliationE-mail
Yu-ping Li CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China  
Jun-ling Tu CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaUniversity of Chinese Academy of Sciences, Beijing 100049, China  
Tie-jun Wang* CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China wangtj@ms.giec.ac.cn 
Long-long Ma* CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China mall@ms.giec.ac.cn 
Xing-hua Zhang CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China  
Qing Zhang CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China  
Chi-liu Cai CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China  
Abstract:
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/Al/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= selectiv-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.
Key words:  Light olefins, Two-stage conversion, Dimethyl ether, Biosyngas, NiSAPO-34/HZSM-5
FundProject:
生物质气经由二甲醚两步法制备低碳烯烃
李宇萍,涂军令,王铁军*,马隆龙*,张兴华,章青,蔡炽柳
摘要:
制备出NiSAPO-34及NiSAPO-34/HZSM-5催化剂,考察了其对二甲醚催化转化制备低碳烯烃的性能.利用Cu/Zn/Al/HZSM-5和筛选出的2%NiSAPO-34/HZSM-5催化剂进行生物质气经由二甲醚两步法制备低碳烯烃的实验, 结果表明在SAPO-34上添加2%的Ni不改变其结构, 但降低了酸中心数量, 并生成了较强的酸中心. 添加少量具有稳定酸中心的HZSM-5, 该催化剂的活性提高到3 h以上, 反应进行2 h获得了最高的低碳烯烃选择性为90.8%. 当把该催化剂应用到两步催化转化过程的第二个反应器中, 其高催化活性可达5 h以上. 当以低氢碳比生物质气(H2/CO/CO2/N2/CH4=41.5/26.9/14.2/14.6/2.89)作为原料时,经两步转化,低碳烯烃的收率达到84.6 g/m3syngas
关键词:  低碳烯烃,二甲醚,两步转化,NiSAPO-34/HZSM-5,生物质气
DOI:10.1063/1674-0068/27/02/227-232
分类号: