Ca2+ 、Mg2+ 在 MCM- 41 离子交换制备镍基催化剂 对合成气甲烷化的性能分析

文博, 朱明远, 代斌

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石河子大学学报 ›› 2016, Vol. 34 ›› Issue (3) : 360-366. DOI: 10.13880/j.cnki.65- 1174/n.2016.03.017
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Ca2+ 、Mg2+ 在 MCM- 41 离子交换制备镍基催化剂 对合成气甲烷化的性能分析

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Preparation of nickel- based catalysts by Ca 2+, Mg2+ exchange in MCM- 41 for methanation of synthesis gas pr operties exploration

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摘要

煤制天然气符合煤炭清洁利用的发展要求,其中合成气甲烷化是关键步骤,而合成气甲烷化催化剂则是关键 的核心。为了探索高效、稳定的合成气甲烷化催化剂,本文采用过量浸渍法制取镍基催化剂,并采用离子交换法在 载 体 MCM-41 加入 碱 土金 属 Ca2+、Mg2+ 探 索 对 催 化 剂 活 性 的 影 响。研 究 结 果 表 明 :在 n (H2)∶n (CO)=3 ∶1、反 应 压 力 1.5 MPa、反应温度 350 ℃及质量空速 30000 h-1 的反应条件下,碱土改性的 Ni/MgO-MCM-41 催化剂 CO 的转化率 为 99%,催化剂选择性达到 90.4%;在 250 ℃时碱土改 性 催化 剂表 现 出良 好 的低 温活 性 ,比 Ni/MCM-41 的 活 性高 60%;碱土改性催化剂高温活性稳定,在 550 ℃时活性测试未出现明显下降。经过一系列表征和分析可知:镍颗粒 细小的分布在载体表面,与载体有强相互作用并且碱土助剂 Ca2+、Mg2+ 阻止了镍颗粒的烧结。

Abstract

Preparation of natural gas by coal is in line with the development requirements of clean utilization of coal, which is a key step for methanation of synthesis gas, and synthesis gas methanation catalysts is the core of the key. In order to explore efficient and stable synthesis gas methanation catalyst, we prepared nickel- based catalysts with the excess impregnation method, and used ion exchange technique to add alkaline earth metal Ca2+, Mg2+ into the MCM- 41 to explore the effect on the catalyst activity. In the n (H2)∶n(CO)=3∶1, under a reaction pressure of 1.5 MPa, 350 ℃ of the reaction temperature and WHSV=30000 h- 1 reaction conditions, CO conversion of an alkaline earth modified Ni/MgO- MCM- 41 catalyst is 99%, and selectivity of the catalyst reaches 90.4%. At 250 ℃, alkaline earth modified catalysts exhibit good low- temperature activity and is higher than that of Ni/MCM- 41 by 60%. And alkaline earth modified catalysts have stability of activity at high temperature at 550 ℃ under no obvious decline in activity tests. After a series of characterization and analysis, we know that the fine particles of the nickel distribute on surface of the carrier, and the carrier has a strong interaction with nickel particles and alkaline additives Ca2+, Mg2+ prevents nickel particles from sintering

关键词

合成气甲烷化 / 镍基催化剂 / 碱土金属 / 离子交换法

Key words

synthesis gas methanation / Nickle- based catalyst / Alkaline earth / ion exchange method

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文博, 朱明远, 代斌 . Ca2+ 、Mg2+ 在 MCM- 41 离子交换制备镍基催化剂 对合成气甲烷化的性能分析. 石河子大学学报. 2016, 34(3): 360-366 https://doi.org/10.13880/j.cnki.65- 1174/n.2016.03.017
WEN Bo, ZHU Mingyuan, DAI Bin. Preparation of nickel- based catalysts by Ca 2+, Mg2+ exchange in MCM- 41 for methanation of synthesis gas pr operties exploration. Journal of Shihezi University. 2016, 34(3): 360-366 https://doi.org/10.13880/j.cnki.65- 1174/n.2016.03.017

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基金

国家自然科学基金项目(U1203293)
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