南京工业大学学报（自然科学版）2011，Vol.33Issue(1)：8-13,6.DOI:10.3969/j.issn.1671-7627.2011.01.002
稀土元素Ce(La)促进的Pt/β催化剂上正庚烷的临氢异构化
Pt/β catalysts promoted by rare earth element Ce(La) for hydroisomerization of n-heptane
摘要
Abstract
Pt supportedβ zeolite catalysts promoted by rare earth elements Ce or La were prepared by the co-impregnation method, and characterized by X-ray diffraction (XRD), BET surface areas( BET), temperature-programmed desorption of ammonia ( NH3-TPD) and H2-chemisorption techniques. Their catalytic activities were evaluated on the hydroisomerization of n-heptane with an atmospheric fixed-bed reactor. The Pt-bearing catalyst doped with Ce or La, especially Ce, was found to exhibit a higher catalytic conversion and much higher isomerization selectivity than the catalyst without the dopant. At the low reaction temperature of 230 ℃, the catalyst with a Pt loading of 0. 4％ and a molar ratio of Ce to Pt of 5: 1 showed a high conversion rate of n-heptane of 61.5％ coupled with a very high selectivity to isomerization products of 96. 7％. In contrast, over the counterpart catalyst without Ce, the conversion rate of n-heptane was 50. 6％ with a low selectivity to isomerization products of 82. 4％. In addition, the same promotion effects of Ce or La were observed on the catalysts, in which dealuminating Hβ zeolite or ultra-stable Y zeolite was pre-coated with phosphotungstic acid as the acidic support. The substantial promotion effect of Ce was suggested in relation to the improved catalyst acidity and the dispersion of the supported Pt.关键词
Ce/La/稀土/烷烃异构化/β沸石Key words
Ce/ La/ rare earth/ hydroisomerization/ beta zeolite分类
化学工程引用本文复制引用
刘平,王军,姚月..稀土元素Ce(La)促进的Pt/β催化剂上正庚烷的临氢异构化[J].南京工业大学学报（自然科学版）,2011,33(1):8-13,6.基金项目
国家自然科学基金资助项目(20476046,20776069) （20476046,20776069）
