酸化膨润土负载金催化剂用于CO氧化

用盐酸和硫酸对膨润土(Ben)进行改性处理,采用浸渍法(IMP)、沉积-沉淀法(DP)和阳离子吸附法(CA)制备改性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了研究,采用BET、XRD、TEM和TPD等对催化剂进行表征。结果表明,经过简单的酸处理后的膨润土比表面积和孔体积有了大幅度的提高,硫酸酸化的膨润土作为载体较之盐酸酸化土更容易得到活性较高的金催化剂,XRD粒径计算结果和TEM观察结果证明,硫酸酸化的膨润土作为载体相比盐酸酸化土可以得到Au颗粒度更小的催化剂。不同制备方法中,阳离子吸附法能较好的将Au负载于膨润土载体上,得到小颗粒的金催化剂,且在吸附48 h、450℃焙烧、150℃下H2还原的预处理条件下得到的催化剂活性最好。

CO Oxidation over Au Catalysts Supported on Acid-activated Bentontie

Acidification by HCl or H2SO4 was applied for modifying bentonite.The Au catalysts supported on acid-activated bentonite had been prepared by the methods of aqueous impregnation,deposition-precipitation and cationic absorption.CO oxidation was used as a probe reaction to characterize the catalytic performance.The samples were characterized by BET,XRD and TEM.The BET results showed that the surface area and pore volume had a substantial improvement.The results of CO oxidation showed that a higher catalyst activity was achieved by Au supported on H2SO4 acidified bentontie.The calculation result by XRD indicated that the Au particles supported on H2SO4 acidified bentontie had smaller size.Small Au particles could be obtained by the method of cationic absorption.Au catalysts with higher catalytic activity could be obtained by the conditions of adsorption for 48 h,calcination at 450 ℃ and H2 reduction at 150 ℃.