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Study on Ni Based Catalyst with Different Support in Partial Oxidation of Methane to Synthesis Gas

Author: FeiYaNan
Tutor: ShenMeiQing
School: Tianjin University
Course: Chemical processes
Keywords: Methane Partial oxidation Ni catalyst Ceria-zirconia Alumina Coke
CLC: TE665.3
Type: Master's thesis
Year: 2007
Downloads: 115
Quote: 1
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Abstract


The partial oxidation of methane (POM) is a concern of methane to syngas method has the advantages of low power consumption, fast reaction rate, high product selectivity and can be directly used for the synthesis of methanol and Fischer - Tropsch synthesis. Many researchers are committed to the development of high activity and good stability of Ni-based catalysts to solve the catalyst coke and sintered metal active component inactivation. In this paper, means of XRD, BET, H2-adsorption of metal dispersity, TPR, TG-DTA, Raman and activity evaluation, mainly to study the α-Al 2 O 3 , CeO 2 -ZrO 2 and of CeO , 2 -ZrO 2 / Al 2 O < sub> 3 carrier of CeO 2 -ZrO 2 / Al 2 O 3 mixed support of the preparation process of the catalytic activity of Ni-based catalysts, stability and resistance to coking, sintering resistance performance. The same time, the optimal load amount of the active component and the experimental conditions under POM reaction mechanism analysis. The study showed that the optimal load amount of the catalyst of the present experiment is 10%, which is shared by the active and load and dispersity common decision. The difference of the vector will lead to differences in physicochemical properties and the catalytic activity of the catalyst. Ni / CeO 2 -ZrO 2 / Al 2 O 3 (mechanical mixing carrier) catalyst requires longer activation period, the initial reaction activity of less than Ni / α-Al 2 the the O 3 and of Ni / CeO 2 -ZrO 2 catalyst, but superior stability and resistance to carbon deposition performance, thanks to the metal - support interaction strong. Raman results show that the catalyst coke inorganic carbon, type of graphite carbon and graphite-like carbon. Under the reaction conditions, the reaction is to comply with the combustion - reforming mechanism. Ni / CeO 2 -ZrO 2 / Al 2 O 3 the catalyst mixed carrier CeO 2 -ZrO 2 / Al 2 O 3 different from the preparation process, the obtained performance of the catalysts are also different. Mechanically mixed catalyst carrier 24h reaction is stable and good, and the degree of sintering the lowest coke least; the atomic mixing carrier coke deposition and sintering serious. The characterization results indicate that the Ni-Al 2 O 3 strong interaction makes the mechanical mixing samples can inhibit the active component of the sintering and coke, to improve the stability of the catalyst. The the of CeO 2 -ZrO 2 Al 2 O 3 interaction, this role of the metal - carrier interaction.

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CLC: > Industrial Technology > Oil and gas industry > Oil, natural gas processing industry > Synthetic oil > Synthetic oil > Preparation and purification of synthesis gas
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