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| La改性Pd基催化剂催化甲烷氧化的抗水热性能研究 |
| Study on the hydrothermal-resistant performance of methane oxidation over La modified Pd-based catalyst |
| 投稿时间：2023-08-16 |
| DOI： |
| 中文关键词: 甲烷催化氧化 钯基催化剂 抗水热 镧 |
| 英文关键词: methane catalytic oxidation Pd-based catalyst hydrothermal-resistant La |
| 基金项目:云南贵金属实验室科技计划项目(YPML-2022050212, YPML-2023050232) |
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| 中文摘要: |
| 甲烷是第二大温室气体，其年度增温潜能是CO2的26~28倍。天然气车排放尾气中的主要成分为未燃烧完全的甲烷和高浓度的水(高达20%)，目前已有大量研究表明水会严重影响Pd活性组分的催化活性及氧化铝载体的催化稳定性，因此如何在高含水废气中处理这些甲烷一直是天然气车后处理催化剂的研究热点。本研究采用等体积浸渍法制备了改性载体(AlLa5、AlLa10和AlLa15)，并用过量浸渍法将0.5%Pd负载到改性载体Al2O3-La和未改性载体γ-Al2O3上，同时考察了La的引入比例对催化剂催化甲烷氧化中的耐水热性能影响，用N2物理吸脱附、CO脉冲吸附、XPS和XRD等方法对所制备催化剂进行表征。结果表明，La的加入明显提高催化剂在催化甲烷氧化中的耐水热性能，其中Pd/AlLa5表现出最优异的耐水热稳定性。 |
| 英文摘要: |
| Methane is the second largest greenhouse gas, with an annual warming potential 26~28 times that of CO2. The main components of exhaust emissions from natural gas vehicles are incompletely burned methane waste gas and high concentrations of water (up to 20%). Numerous studies have indicated that water can significantly affect the catalytic stability of the Pd active component and the alumina support. Therefore, the treatment of methane in high-humidity exhaust gas has been a hot research topic in the post-treatment catalysts for natural gas vehicles. How to treat these low-concentration methane waste gases in a high-humidity atmosphere has always been a hot topic in academic research. In this study, modified supports (AlLa5, AlLa10, and AlLa15) were prepared using the incipient wetness impregnation method, and 0.5% Pd was loaded onto the modified supports and unmodified support (γ-Al2O3) using the excess impregnation method. The effect of the introduction of La on the water-thermal stability of the catalyst for methane oxidation was investigated. The prepared catalysts were characterized by N2 physical adsorption-desorption, CO-TPR, XPS, and XRD. The results showed that the addition of La significantly improved the water-thermal stability of the catalyst in methane oxidation, with Pd/AlLa5 exhibiting the best hydrothermal-resistant performance. |
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