Acta Chimica Sinica ›› 2004, Vol. 62 ›› Issue (18): 1721-1728. Previous Articles     Next Articles

Ni修饰碳纳米管促进合成气高效制甲醇Cu基催化剂研究

沈炳顺, 武小满, 张鸿斌, 林国栋, 董鑫   

  1. 厦门大学化学化工学院, 固体表面物理化学国家重点实验室, 厦门, 361005
  • 投稿日期:2004-04-07 修回日期:2004-06-26 发布日期:2014-02-17
  • 通讯作者: 张鸿斌,E-mail:hbzhang@xmu.edu.cn E-mail:hbzhang@xmu.edu.cn
  • 基金资助:
    教育部科技基金(No.20010384002),国家自然科学基金(No.50072021)和福建省自然科学基金(No.2001H017)资助项目.

Study of Highly Active Cu-based Catalyst Promoted by Nickel-modified Multi-walled Carbon Nanotubes for Methanol Synthesis

SHEN Bing-Shun, WU Xiao-Man, ZHANG Hong-Bin, LIN Guo-Dong, DONG Xin   

  1. Institute of Chemistry & Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005
  • Received:2004-04-07 Revised:2004-06-26 Published:2014-02-17

By using chemical reduction-deposition method, a nickel-modified multi-walled carbon nanotube material, symbolized as y%Ni/MWCNT, was prepared. The H2-TPD measurement showed that the modification of metallic nickel to the MWCNT could significantly enhance its capability of dissociatively adsorbing hydrogen. With the y%Ni/MWCNT as promoter, highly active y% Ni/MWCNT-promoted Cu-ZnO-Al2O3 catalysts, symbolized as Cu6Zn3Al1-x% (y%Ni/MWCNT), were prepared by co-precipitation method. It was experimentally found that appropriate incorporation of a minor amount of the y%Ni/MWCNT into the Cu6Zn3Al1 could significantly enhance the catalyst activity for methanol synthesis. Under the reaction conditions of 2.0 MPa, V(H2):V(CO):V(CO2):V(N2)=62:30:5:3, GHSV=2700 mL(STP)·h-1·(g-cat.)-1, the observed CO-conversion over the Cu6Zn3Al1-12.5% (8%Ni/MWCNT) catalyst reached 34%, with the corresponding methanol-STY at 442 mg·h-1·(g-cat.)-1, which was about 38% and 17% higher than those over the Cu6Zn3Al1 and Cu6Zn3Al1-12.5% MWCNT catalysts as contrast, respectively, at the respective optimal operation temperature, 513 K and 503 K. Characterization of the catalyst revealed that the pre-reduced Cu6Zn3Al1-12.5%(8%Ni/MWCNT) system could reversibly adsorb a considerably greater amount of hydrogen under atmospheric pressure at temperatures ranging from room temperature to ~573 K. This unique feature would be beneficial to generating microenvironments with relatively high stationary-state concentration of active hydrogen-adspecies on surface of the functioning catalyst, thus being favorable to increasing the rate of the CO hydrogenation reactions.

Key words: MWCNT, Ni-modified MWCNT, CuiZnjAlk-x%(y%Ni/MWCNT)catalyst, methanol synthesis