摘要
采用浸渍法制备了Ce0.8La0.2O1.9固溶体负载Pt催化剂,用于气相巴豆醛选择加氢反应中.采用X射线粉末衍射、程序升温还原、NH3程序升温脱附和拉曼光谱等技术对催化剂进行了表征.结果表明,随着Pt负载量增加,Pt/Ce0.8La0.2O1.9催化剂活性(TOF)和巴豆醇选择性均先增加后降低.当Pt负载量为3%时,反应TOF值和巴豆醇选择性最高,分别为4.01×10-3s-1和53.6%.催化剂性能取决于催化剂表面酸性和Pt晶粒大小,反应过程中催化剂表面积炭是导致催化剂活性和选择性下降的主要原因.
The vapor-phase selective hydrogenation of crotonaldehyde was carried out over Pt/Ceo.sLao.201.9 catalysts prepared by impregnation. The catalysts were characterized by X-ray powder diffraction, temperature-programmed reduction, NH3 temperatureprogrammed de- sorption, and Raman spectroscopy. It was found that with increasing Pt loading in Pt/Ceo.sLao.201.9, both the activity （TOF） and selectivity for crotyl alcohol increased first and then decreased a little. The 3%Pt/Ceo.8Lao.201.9 catalyst showed the highest activity （TOF） and selectivity for crotyl alcohol in hydrogenation of crotonaldehyde （4.01 x 10-3 S-1 and 53.6%, respectively）. It was concluded that the catalytic performance of the catalysts depends on the surface acidity and the Pt particle size. Carbon deposition formed on the catalyst surface during the hydrogenaton process may account for the decrease in the catalytic activity and selectivity for crotyl alcohol.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第3期513-519,共7页
基金
浙江省自然科学基金(Y4100300)
关键词
铂
负载型催化剂
巴豆醛
选择性加氢
巴豆醇
积炭
platinum
supported catalyst
crotonaldehyde
selective hydrogenation
crotyl alcohol
carbon deposition
