催化学报
催化學報
최화학보
CHINESE JOURNAL OF CATALYSIS
2010年
11期
1342-1346
,共5页
制备过程%钯%硅钨酸%二氧化硅%乙烯氧化%乙酸
製備過程%鈀%硅鎢痠%二氧化硅%乙烯氧化%乙痠
제비과정%파%규오산%이양화규%을희양화%을산
preparation procedure%palladium%silicotungstic acid%silica%ethylene oxidation%acetic acid
采用不同负载顺序或制备过程制备了Pd-SiW12/SiO2催化剂,考察了它们在乙烯直接氧化制乙酸反应中的催化性能.结果表明,Pd和SiW12的负载顺序与Pd负载后的处理条件对Pd-SiW12/SiO2催化剂上Pd的分散度影响较大,但对催化剂表面B酸量影响不大,而Pd分散度较高时,相应催化剂活性较高.将Pd和SiW12同时负载于SiO2上时,催化剂表现出较高的催化乙烯直接氧化制乙酸反应活性.
採用不同負載順序或製備過程製備瞭Pd-SiW12/SiO2催化劑,攷察瞭它們在乙烯直接氧化製乙痠反應中的催化性能.結果錶明,Pd和SiW12的負載順序與Pd負載後的處理條件對Pd-SiW12/SiO2催化劑上Pd的分散度影響較大,但對催化劑錶麵B痠量影響不大,而Pd分散度較高時,相應催化劑活性較高.將Pd和SiW12同時負載于SiO2上時,催化劑錶現齣較高的催化乙烯直接氧化製乙痠反應活性.
채용불동부재순서혹제비과정제비료Pd-SiW12/SiO2최화제,고찰료타문재을희직접양화제을산반응중적최화성능.결과표명,Pd화SiW12적부재순서여Pd부재후적처리조건대Pd-SiW12/SiO2최화제상Pd적분산도영향교대,단대최화제표면B산량영향불대,이Pd분산도교고시,상응최화제활성교고.장Pd화SiW12동시부재우SiO2상시,최화제표현출교고적최화을희직접양화제을산반응활성.
Pd-SiW12/SiO2 catalysts were investigated to elucidate the effect of preparation procedure on the direct oxidation of ethylene to acetic acid. Pd-SiW12/SiO2 catalysts with a fixed amount of Pd and SiW12 were prepared in various ways. The order in which Pd and SiW12 were loaded on the SiO2 support and the treatment conditions for the supported Pd have a significant influence on the dispersion of Pd on the Pd-SiW12/SiO2 catalysts, but no influence on the concentration of B acid sites. The Pd-SiW12/SiO2 catalyst prepared by simultaneously loading Pd and SiW12 on the SiO2 support showed the best catalytic activity. The dispersion of Pd was the main factor in the catalytic activity.
