摘要
采用表面反应改性法 ,制备了 Zr O2 - Si O2 (Zr Si O)表面复合物载体 ,用等体积浸渍法制备了 Zr Si O担载的Cu- Ni双金属催化剂 .借助 BET、TPR、IR和微反等技术 ,研究了 Zr Si O及其负载的 Ni、Cu双金属催化剂的表面构造、化学吸附及催化 CO2 加氢的反应性能 .结果表明 ,Zr Si O表面主要是价联型结构 ;Zr O2 引入 Si O2 表面 ,可以有效地促进 Cu O和 Ni O的还原 .在 Zr Si O负载的 Cu- Ni催化剂表面的 Cu或 Ni位 ,CO2 发生化学吸附形成线式、剪式、卧式吸附态 .在该催化剂上 CO2 的加氢反应产物主要是 CH3OH、CH4、CO和 H2 O,生成 CH3OH的选择性与催化剂组成及反应条件密切相关 ,在适当的条件下 ,CH3OH的选择性大于 90 % .
The surface complex oxides of ZrO 2 SiO 2(ZrSiO ) were prepared by surface modification of SiO 2. ZrSiO supported Ni Cu binary metal catalysts were prepared by isometric impregnation method. The surface structure of ZrSiO and Ni Cu/ZrSiO, the chemisorption properties of CO 2 and the catalytic performance of Ni Cu/ZrSiO have been investigated using BET, XRD, TPR, IR and microreactor. Experimental results show that ZrSiO supports are bond conjugated type surface complex oxides. The presence of ZrO 2 on the SiO 2 surface promotes the reduction of CuO and NiO. CO 2 can be adsorbed on the Ni sites or Cu sites to form linear, shearing and horizontal adsorption species. The main products of CO 2 hydrogenation are CH 3OH, CH 4, CO and H 2O. The selectivity to CH 3OH depends closely on the catalyst compositions and reaction conditions. A selectivity to CH 3OH higher than 90% can be attained over Cu Ni/ZrSiO 2 catalyst under proper reaction conditions.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2001年第3期170-174,共5页
Journal of Molecular Catalysis(China)
基金
天津市基金资助项目
