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Research on Catalyst for Methanation of Coal Gas

Author: LiuWenYan
Tutor: YingWeiYong
School: East China University of Science and Technology
Course: Chemical processes
Keywords: Nickel ZrO2-SiO2 Carbon monoxide Carbon dioxide Methanation
CLC: TQ536.9
Type: Master's thesis
Year: 2011
Downloads: 297
Quote: 2
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Abstract


Coal as raw material, the synthesis gas by methanation reaction synthetic preparation of natural gas is one of the important way to utilize coal cleaning , now attracted wide attention . The design and synthesis has a the methanation catalyst of high activity , high thermal stability is of great practical significance for the efficient use of coal . In this paper, the methanation reaction of the nickel-based catalyst supported research . The paper focuses on the Ni catalyst system ZrO2-SiO2 composite oxide as the carrier 's load effects of ZrO2-SiO2 composite carrier preparation conditions and catalyst preparation conditions the activity of the catalyst for the methanation reaction , and to characterize the catalysts . The study found that compared with pure SiO2 carrier , ZrO2- SiO2 composite oxide supported Ni -based catalysts have better methanation reactivity . Carrier preparation conditions on Ni/ZrO2-SiO2 catalyst structure and methanation activity , the experimental results show that : when ZrO2/SiO2 = 45% , the catalyst for the methanation reaction Ni/ZrO2-SiO2 best activity ; increase impregnated the pH of the solution to favor the formation of smaller grain metastable tetragonal crystal phase of ZrO2 carrier ZrO2 tetragonal phase , Ni-based catalysts have a better the methanation reaction activity ; the calcination temperature was 550 ° C. when , Ni/ZrO2-SiO2 catalysts NiO grain size is the most suitable for methanation reaction . Investigated the influence of catalyst preparation conditions on the Ni/ZrO2-SiO2 catalyst structure and methanation activity . When the loading amount of Ni is from 4% to 10 % , increasing the amount of Ni in the load will improve the methanation reaction Ni/ZrO2-SiO2 catalyst activity , but the high Ni content (e.g. 12%) will result in the active ingredient in the surface of the carrier accumulation , leading to reduced activity of the catalyst reaction ; the catalyst calcination temperature was 450 ° C , of NiO , and the inter-carrier has a strong interaction of NiO good dispersion , the methanation activity .

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CLC: > Industrial Technology > Chemical Industry > Processing and utilization of coal chemical and coal > Coal processing and utilization > Other
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