摘要
采用表面反应改性法制备了ＭｏＯ３－ＳｉＯ２（ＭｏＳｉＯ）表面复合物，用等体积浸渍法制备了ＭｏＳｉＯ担载的Ｃｕ－Ｎｉ双金属催化剂。利用ＩＲ和ＴＰＤ研究了ＣＯ２在催化剂表面上的吸附性能，并讨论了ＣＯ２在Ｃｕ－ＮｉＭｏＳｉＯ上的表面反应机理。结果表明，ＣＯ２在上述催化剂上有良好的化学吸附性能，形成线式吸附态、剪式吸附态和卧式吸附态；ＣＯ２卧式吸附态具有良好的表面反应活性，在一定温度下可解离为吸附的ＣＯ和Ｏ。
The surface complex support of MoO 3-SiO 2(MoSiO) was prepared by using surface reaction modification. MoSiO supported Cu-Ni bimetallic catalysts were made by the method of isovolumic impregnation. Adsorption states and sites of CO 2 on catalysts were characterized by IR and TPD techniques, and the surface reaction mechanism of CO 2 on Cu-Ni/MoSiO was discussed. The results show that CO 2 can chemisorb on the surface of catalysts with three types of adsorption states, which are linear, shearing and horizontal. CO 2 horizontal adsorption state is formed by shearingly adsorbed CO 2 on the metal site (M) in cooperation with the adjacent Lewis acid site (Mo 6+ ), and can be dissociated into adsorbed CO and O at about 138℃. This nascent oxygen has good selective oxidation.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1999年第4期305-308,共4页
Journal of Fuel Chemistry and Technology
关键词
二氧化碳
吸附
双金属催化剂
催化剂
adsorption of carbon dioxide, MoO 3-SiO 2 complex support, bimetallic catalyst, surface reaction
