TAILIEUCHUNG - Carbon - Supported Platinum Catlyst for N-Hexane dehydrogenation

Activated carbon (AC) from coconut shells is used as support for platinum catalysts. A series of catalysts based on platinum and Pt doped Sn were prepared by impregnation on different supports like AC and SiO2. It was shown that the nature of the support has a significant influence on the activity and selectivity to alkenes of the catalysts in the dehydrogenation of nhexane to alkenes. The higher activity and selectivity of the carbon supported platinum catalyst can be explained by higher dispersion of platinum particles of the catalysts. The addition of Sn led higher stability and activity and that may be related to the formation of a PtSn alloy on the surface and the modification of interaction between the alkenes and the metal sites, making it weaker and keeping the metallic surface more free of cokes by migration of that to the carbon surface. | Journal of Chemistry Vol. 41 No. 1 P. 110 -114 2003 CARBON - SUPPORTED PLATINUM CATALYST FOR N-HEXANE DEHYDROGENATION Received 01-7-2002 NGUyEN THI ĐUNG TRAN MANH TRI Institute of Chemical Technology Hochiminh City SUMMARy Activated carbon AC from coconut shells is used as support for platinum catalysts. A series of catalysts based on platinum and Pt doped Sn were prepared by impregnation on different supports like AC and SiO2. It was shown that the nature of the support has a significant influence on the activity and selectivity to alkenes of the catalysts in the dehydrogenation of n-hexane to alkenes. The higher activity and selectivity of the carbon supported platinum catalyst can be explained by higher dispersion of platinum particles of the catalysts. The addition of Sn led higher stability and activity and that may be related to the formation of a PtSn alloy on the surface and the modification of interaction between the alkenes and the metal sites making it weaker and keeping the metallic surface more free of cokes by migration of that to the carbon surface. I - INTRODUCTION Platinum supported catalysts are widely used in many industrial processes including hydrogenation dehydrogenation and reforming of n-alkanes. Its chemical stability in both oxidizing and reducing conditions makes this metal an ideal catalyst in many applications. Catalytic dehydrogenation of alkanes is of increasing importance due to the growing demand for linear alkenes as raw materials for the production of biodegradable detergents. Bimetallic Pt-Sn Al2O3 catalysts have been extensively studied by many research groups 1 - 4 due to their importance in industrial petrochemical processes. Many of these studies have focused on hydrocarbon conversion such as isomerization aromatization dehyrocyc-lization and dehydrogenation of light alkanes. Timofeeva et al. 6 studied Pt Al2O3 and Lidoped Pt Al2O3 catalysts and showed that the selectivity to monoalkenes is dependent on the presence of Li but

• Hoá học
• Công nghệ hóa
• Supported Platinum Catlyst
• N Hexane dehydrogenation
• Hóa vô cơ
• Activated carbon
• Kỹ thuật hệ thống công nghệ hóa học
• Hệ thống công nghệ hóa học
• Công nghệ hóa học
• Tối ưu hóa
• Quá trình công nghệ hóa học
• Phương pháp giải thích
• Quy hoạch toán học
• Phương pháp gradient
• Mô hình hóa công nghệ hóa học
• Nghiên cứu công nghệ hóa học
• Mô tả công nghệ hóa học
• giáo trình công nghệ hóa học
• thiết bị công nghệ hóa học
• bài giảng công nghệ hóa học
• công nghệ hóa chất
• tài liệu công nghệ hóa chất
• áp dụng công nghệ hóa chất
• tìm hiểu công nghệ hóa chất
• nghiên cứu công nghệ hóa chất
• công nghệ hóa dầu
• bài giảng công nghệ hóa dầu
• giáo trình công nghệ hóa dầu
• tài liệu công nghệ hóa dầu
• lý thuyết công nghệ hóa dầu