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Ce-Cu-Co/CNTs催化剂催化合成气制低碳醇及乙醇的研究 预览 被引量:8

Study of Ce-Cu-Co/CNTs Catalysts for the Synthesis of Higher Alcohols and Ethanol from Syngas
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摘要 采用共浸渍法制备了不同Ce含量的Ce-Cu-Co/CNTs催化剂,考察了其在合成气制低碳醇反应中的催化性能,借助X射线衍射(XRD)、程序升温还原(H2-TPR)、N2吸脱附实验(BET)、透射电镜(TEM)和CO程序升温脱附(CO-TPD)对这些催化剂进行了表征.结果表明,当Ce的质量分数为3%时,低碳醇的时空收率和选择性达到最高,分别为696.4 mg?g-1?h-1和59.7%,其中乙醇占总醇的46.8%,适量Ce的添加能提高Cu物种在催化剂上的分散度和催化剂的还原性能,能显著地增加催化剂吸附CO的能力,促进合成醇活性位的形成,进而明显提高催化剂的活性和总醇的选择性.研究表明,将具有高活性和高碳链增长能力的CuCo基催化剂与碳纳米管的限域效应结合,可实现缩窄产物分布、大幅度提高乙醇选择性的目的. A series of Ce-Cu-Co/carbon nanotubes (CNTs) catalysts with different Ce contents were prepared by co-impregnation, and the catalytic performance was investigated for the synthesis of higher alcohols from syngas. The catalysts were characterized by X-ray diffraction (XRD), temperature-programmed reduction of H2 (H2-TPR), N2 adsorption-desorption isotherms (BET), transmission electron microscopy (TEM), and temperature-programmed desorption of CO (CO-TPD). The results showed that at a Ce content of 3% the catalyst had the highest catalytic activity. The formation rate and selectivity of alcohol reached 696.4 mg .g-'. h-1 and 59.7%, where the mass fraction of ethanol was 46.8% of the total amount of alcohols. The addition of an appropriate amount of Ce facilitated the dispersion of Cu and promoted reduction of the catalysts. It also markedly increased the adsorption capacity for CO, and significantly improved the formation of active sites for alcohols, which is favorable for the catalytic activity and to improve the selectivity of alcohols. Research showed that combining the CuCo-based catalyst, which has high activity and a high ability of carbon chain growth, with the confinement effect of CNTs can result in a narrow distribution of alcohols and significantly improve the selectivity of ethanol.
作者 韩涛 黄伟 王晓东 唐钰 刘双强 游向轩 HAN Tao, HUANG Wei, WANG Xiao-Dong, TANG Yu, LIU Shuang-Qiang, YOU Xiang-Xuan (1.Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, P R. China; 2.State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P R. China)
出处 《物理化学学报》 SCIE CAS CSCD 北大核心 2014年第11期2127-2133,共7页 Acta Physico-Chimica Sinica
基金 国家自然科学基金重点项目(21336006) 国家自然科学基金面上项目(21176176) 高等学校博士学科点专项(优先发展领域)(20111402130002) 煤转化国家重点实验室开放课题基金项目(J14-15-603)资助
关键词 CE CuCo/CNTs催化剂 合成气 低碳醇 乙醇 Ce CuCo/CNTs catalyst Syngas Higher alcohol Ethanol
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