掺杂Cr助剂的Pt/USY催化剂上正庚烷异构化反应研究(英文)  

Hydroisomerization of n-Heptane over Pt/USY Catalysts Promoted by Cr Additive

作　　者：魏瑞平[1] 顾焰波[1] 孔岩[1] 王军[1] 

机构地区：[1]南京工业大学化学化工学院材料化学工程教育部重点实验室,南京210009

出　　处：《无机化学学报》2007年第3期523-528,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金项目(No.20306011,20476046);高校博士点基金项目(No.20040291002);南京工业大学博士生创新基金项目(No.BSCX200506)资助

摘　　要：The Pt-supported USY zeolite catalysts doped with Cr, Al or Zn were prepared by impregnation, and characterized by XRD, low temperature nitrogen physisorption, H2-chemisorption and IR spectroscopy of the pyridine adsorption. Catalytic activities were evaluated via the hydroisomerization of n-heptane with an atmospheric fixed-bed reactor. The Pt dispersion and acidity of the Pt-supported USY catalyst were influenced by the addition of the promoters. The Pt-supported catalysts promoted by Cr, Al or Zn, especially by Cr, were catalytically much more stable and exhibited much higher catalytic activity and selectivity for isomerization of n-heptane than the catalysts without the dopant. Both the conversion and selectivity are discussed in relation with the physicochemical properties of catalysts.The Pt-supported USY zeolite catalysts doped with Cr, A1 or Zn were prepared by impregnation, and characterized by XRD, low temperature nitrogen physisorption, H2-chemisorption and IR spectroscopy of the pyridine adsorption. Catalytic activities were evaluated via the hydroisomerization of n-heptane with an atmospheric fixed-bed reactor. The Pt dispersion and acidity of the Pt-supported USY catalyst were influenced by the addition of the promoters. The Pt-supported catalysts promoted by Cr, Al or Zn, especially by Cr, were catalytically much more stable and exhibited much higher catalytic activity and selectivity for isomerization of nheptane than the catalysts without the dopant. Both the conversion and selectivity are discussed in relation with the physicochemical properties of catalysts.

关 键 词：加氢异构化 正庚烷 助剂 USY PT 

分 类 号：O643.36[理学—物理化学]