Rh-Mo-K/γ-Al_2O_3催化剂的TPR研究  

A TPR study on Rh-Mo-K/γ-Al_2O_3 catalysts

作　　者：李翠华[1] 李忠瑞[2] 伏义路[2] 施其宏[1] 

机构地区：[1]汕头大学科学院材料化学研究室 [2]中国科学技术大学化学物理系

出　　处：《汕头大学学报（自然科学版）》1999年第1期28-30,共3页Journal of Shantou University：Natural Science Edition

摘　　要：用TPR对γ－Al2O3负载的Rh催化剂和Rh-Mo-K催化剂的还原性能进行了比较研究,发现Rh催化剂在氧化过程中形成两种Rh的氧化物；向Mo-K催化剂加入铑使得Mo易还原，且Rh的氧化物部分覆盖K-Mo物种，因而形成了含有Mo-O-Rh键的混合氧化物，该物种稳定，500℃时不能被H2还原,这些氧化物提高反应活性的机理可能是降低了CO化学吸咐，增大了表面H原子的浓度，从而有利于长碳链醇的合成.A comparative study is made of the reduction behaviors between aluminiasupported Rh catalysts and Rh-Mo-K catalysts with different rhodium loading by means of TPR, Oxidation of the Rh catalysts results in two forms of Rh oxide different in reduction temperature, Addition of rhodium into Mo-K system makes molybdenum easier to be reduced, and Rhodium oxides partly cover the surface of Mo-K species, thereby forming mixed oxides containing Mo-O-Rh bonds, which are so stable that they cannot be reduced by treatment with hydrogen at 500℃, A possible mechanism of these mixed oxides in the alcohol synthesis reactions is that they reduce CO chemisorption, thereby to increase the surface concentration of hydrogen atoms, thus promoting a greater increase in the synthesis of long-chain alcohols,

关 键 词：铑催化剂 钼基催化剂 程序升温还原 催化剂 TPR 

分 类 号：O643.36[理学—物理化学]