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The Research of Synthesis, Characterization and Properties About Bimetallic Catalyst in Methane Autothermal Reforming

Author: ChenYangQing
Tutor: LiBaiTao
School: South China University of Technology
Course: Applied Chemistry
Keywords: Carbon dioxide Methane autothermal reforming the presence of oxygen Catalytic activity Ni / base catalyst Ni Pt bimetallic catalyst
CLC: O643.32
Type: Master's thesis
Year: 2010
Downloads: 63
Quote: 0
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Abstract


Methane reforming energy is currently the most popular topics. It is mainly composed of methane partial oxidation reforming, carbon dioxide reforming of methane. However, the partial oxidation reforming reaction of methane in the presence of hot spots in the catalyst bed and a mixture of methane and oxygen prone to explosion, the partial oxidation of methane difficult to industrial applications. In recent years, carbon dioxide reforming of methane to syngas and industry attracted worldwide attention, but the reaction is strongly endothermic reaction, energy consumption and the catalyst is easy coke, so the process can hardly be industrial applications. Partial oxidation of methane and carbon dioxide reforming of methane to synthesis gas does not exist coupled partial oxidation of methane and CO 2 reforming shortcomings and because implementation of the (partial) thermal coupling is self-heating, effectively inhibited methane partial oxidation reaction formation of hot spots and CO 2 reforming reaction coke problem, and for the product H 2 and CO ratio can be modulated. In this paper, the conventional Ni / Al 2 O 3 -based catalyst, adding a small amount of Pt to be modified, Ni Pt investigated, while the catalytic activity, respectively, γ-Al 2 O 3 , ZrO 2 , SiO 2 of vector design different catalysts for the study, the presence of oxygen to carbon dioxide methane autothermal reforming syngas reaction as the goal, the use of self-designed fixed bed reactor activity evaluation device for different carrier single, double metal catalytic activity compared study the carrier, the active component concentration, reaction temperature, feed gas ratio and precursor effect on catalyst performance, and using XRD, BET, TPR, TG, etc. The catalyst test methods detailed structural interpretation and composition of the catalyst activity explores the relationship between the structure. The results show that the addition of small amount of Pt can dramatically improve the Ni-based catalyst activity and stability of the active bimetallic catalyst with the increase of the content of the active ingredient becomes strong; temperature also affect the activity of the catalyst is an important factor the higher the temperature, the better the catalytic activity, since the alloy, leading to a single metal catalyst is affected by temperature than the bimetallic catalyst should be large; with ZrO 2 carrier body compared to using γ-Al 2 O 3 , SiO 2 as the carrier prepared catalyst activity lower. Research revealed the active component and the carrier strength of the interaction between a key factor affecting the performance of the catalyst.

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