La2O3含量对La-Ni/ZrO2-Al2O3催化剂甲烷化性能的影响

摘要

采用浸渍法制备了复合氧化物ZrO₂-Al₂O₃，在此基础上采用共浸渍法制备了La-Ni/ZrO₂-Al₂O₃催化剂，考察了催化剂中La₂O₃含量对催化剂CO甲烷化活性的影响，并利用BET、XRD和TPR对催化剂的物化性能进行了分析。结果表明当La₂O₃含量为2%~6%（质量分数，下同）时，其在低温和高温时的催化活性均比Ni/ZrO₂-Al₂O₃有一定的提升。另外比较了催化剂4La-Ni/ZrO₂-Al₂O₃和Ni/ZrO₂-Al₂O₃在500℃下连续反应100 h的活性和积碳，结果显示催化剂4La-Ni/ZrO₂-Al₂O₃具有很好的稳定性和优良的抗积碳性能。

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	张浩
	武媛媛
	胡彤宇
	郭翠梨

关键词：甲烷化； Ni/ZrO₂-Al₂O₃； La₂O₃助剂；稳定性

Abstract：

ZrO₂-Al₂O₃composite oxides were prepared by impregnation method, and La-Ni/ZrO₂-Al₂O₃catalysts with different La₂O₃ contents were prepared by co-impregnation method. The effect of La₂O₃ contents was test for CO methanation and analyzed by BET, XRD and TPR. The results showed that introducing a small amount of La₂O₃ (2%-6%) into Ni/ZrO₂-Al₂O₃ catalyst could increase its methanation activity, especially at low temperature range and high temperature range. Furthermore, the continuous reactions of 100 h under 500℃ were performed to investigate the stability performance and carbon deposition of the 4La-Ni/ZrO₂-Al₂O₃ and Ni/ZrO₂-Al₂O₃. The 4La-Ni/ZrO₂-Al₂O₃ catalyst displayed superior stability and excellent anti-carbon deposition property than Ni/ZrO₂-Al₂O₃.

Keywords： CO methanation； Ni/ZrO₂-Al₂O₃ catalyst； La₂O₃ promoter； stability

Received 2016-03-29;

Corresponding Authors: 郭翠梨,E-mail:gcl@tju.edu.cn。 Email: gcl@tju.edu.cn

About author: 张浩(1989-),男,硕士研究生,研究方向为多相催化反应。

引用本文:

张浩, 武媛媛, 胡彤宇, 郭翠梨.La₂O₃含量对La-Ni/ZrO₂-Al₂O₃催化剂甲烷化性能的影响[J]. 化学工业与工程, 2018,35(1): 39-44

Zhang Hao, Wu Yuanyuan, Hu Tongyu, Guo Cuili.Effect of La₂O₃ Addition on Catalytic Performance of La-Ni/ZrO₂-Al₂O₃ Catalyst for Syngas Methanation[J]. Chemcial Industry and Engineering, 2018,35(1): 39-44

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