硫酸酸化膨润土负载Au及Au-Ce催化剂的制备及其催化性能

Au and Au-Ce Catalysts Supported on Bentontie Acid-activated by H_2SO_4 and the catalytic performance

采用硫酸对膨润土(Ben)进行改性处理,通过沉积-沉淀法(DP)制备活化后膨润土负载的金催化剂,以CO氧化作为探针反应对催化剂的催化性能进行研究。采用CTAB修饰载体表面并添加Ce作为助剂制备Au2Ce催化剂,并用BET、XRD、ICP和TPD等对催化剂进行了表征。结果表明:经过简单酸处理后的膨润土比表面积和孔体积有了大幅度的提高,质量分数30%的硫酸对膨润土的改性效果更好。以硫酸酸化膨润土作为载体,Au2Ce复合催化剂相比Au催化剂性能有较大提高。

The bentonite was modified with H2SO4 in this paper. The Au catalysts supported on acid-activated bentonite had been prepared by the methods of deposition-precipitation. CO oxidation was used as a probe reaction to characterize the catalytic performance. The surface of acid-activated bentonite was modified by CTAB, and then adding Ce as assistant to prepare Au-Ce catalyst. The samples were characterized by BET, XRD and TPD. The results showed that the surface area and pore volume had a substantial improvement, to（ H2SO4 ） --30% can modify bentonite better than others. When using the bentontie activated by H2 SO4 as supporter, the activity of Au-Ce catalyst was better than that of Au catalyst.