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The Study of Supported Platinum Catalysts and Catalytic Process for Propane Dehydrogenation

Author: YuChangLin
Tutor: XuHengYong
School: Dalian Institute of Chemical Physics
Course: Industrial Catalysis
Keywords: Propane dehydrogenation Pt-based catalyst metal oxide interactions reaction atmospheres
CLC: O643.36
Type: PhD thesis
Year: 2007
Downloads: 754
Quote: 6
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Abstract


Propylene is an important raw material in petrochemical industry. Nowadays, most of the propylene is obtained as by-product of gasoline production by both thermal and catalytic cracking processes, thus, the gasoline market demands determine the availability of propylene. Due to the growing demand for propylene, the research of propane dehydrogenation to propylene becomes a key research field in petrochemical industry.In this work, the effects of metal oxide promoters and small amount of oxygen addition to catalytic system on the structure and the dehydrogenation performance of Pt-based catalyst are investigated. This work is of importance in developing novel and highly performance Pt-based catalysts and high efficient dehydrogenation technology.A series of metal oxide promoters （Sn, Ce, Zn, V, La, Cr, Fe, Zr and Mn） can improve the performance of Pt/γ-Al2O3 for propane dehydrogenation. The CeO2 promotes the activity and stability of Pt/γ-Al2O3 catalyst and ZnO gives a great increase in selectivity of propylene. Combination the unique property of Zn and Ce on Pt/γ-Al2O3 catalyst, a novel Pt/Ce-Zn-γ-Al2O3 catalyst is developed. The performance of the novel Pt/Ce-Zn-γ-Al2O3 three components catalyst is superior to the common Pt-Sn catalyst.The effects of metal oxides addition on the structure and dehydrogenation performance of Pt-Sn catalyst are further investigated. The improvement effects of these metal oxide promoters on Pt-Sn catalyst are more distinctive than the common alkali metal promoters. Metal oxides promoters can greatly increase the disperstion and stability of Pt particles. The presence of CeO2 in Pt-Sn/Ce-γ-Al2O3 catalyst can induce the strong interactions between Pt, promoter, and support, which results in a notable stability to Pt particles and the suface of alumina support. CeO2 promoteralso helps to maintain the oxidative state of tin in reaction, which may further increase the stability of catalyst. It has been also found that the presence of zinc can change the electronic property of the Pt metallic phase. The distinct electronic effect will weaken the strength of the Pt-（C=C） bond and promote olefin desorption, then suppress the formation of coke on the metal and greatly promote the selectivity of propylene. These two novel three components catalysts, Pt-Sn/Ce-γ-Al2O3 and Pt-Sn/Zn-γ-Al2O3, are reported as the optimal catalyst for propane dehydrogenation to propylene in present literatures.The effects of oxygen addition to catalytic dehydrogenation system on the structure and the dehydrogenation performance of platinum catalysts are investigated. It is found that small amount of oxygen addition into the reaction system can greatly promote the conversion of propane. The addition of small amount of oxygen can decrease the pressure of hydrogen, eliminate coke and provide heat for catalytic dehydrogenation reaction. The propane dehydrogenation reaction mechanism in H2/O2 gas medium is also discussed. This reaction is of importance in the development of new dehydrogenation technology based on partial combustion of hydrogen to generate heat in situ to the endothermic dehydrogenation processes.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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