基于Pd@S-1贵金属限域分子筛的合成条件优化及甲烷催化氧化性能研究  

Study on the Synthesis Conditions of Restricted Molecular Sieve Catalysts for Methane Oxidation

作　　者：董安琪 Dong Anqi(China Automotive Inspection Center(Tianjin)Co.,Ltd.,Tianjin,300350)

机构地区：[1]中汽研汽车检验中心(天津)有限公司,天津300350

出　　处：《当代化工研究》2024年第20期176-178,共3页Modern Chemical Research

基　　金：天检中心青年基金“高耐久天然气发动机后处理稀土改性分子筛限域催化剂”(项目编号:TJKY2324028)。

摘　　要：天然气车与传统燃油车相比,污染物及二氧化碳排放量大幅度削减。甲烷作为天然气燃料的主要组成成分,需要通过后处理催化装置进行排放控制。本文研究了能够用于甲烷催化氧化的贵金属限域分子筛材料Pd@S-1,筛选出了贵金属限域分子筛催化剂的最佳合成参数和最优合成条件。研究结果表明使用PdCl_(2)作为前驱体能够增加催化剂中贵金属含量;模板剂浓度优选TPAOH/SiO_(2)摩尔比为0.3;为保证产率达到98%,晶化时间应不少于72 h;进一步揭示了催化剂活性与金属价态之间的紧密联系,当Pd处于氧化态时具有更优的甲烷氧化效果。Compared with traditional fuel vehicles,natural gas vehicles have significantly reduced emissions of pollutants and carbon dioxide.Methane requires emission control through post-treatment catalytic devices.This article investigates precious metal confined molecular sieve materials that can be used for methane catalytic oxidation Pd@S-1,and screened out the optimal synthesis parameters and conditions.The results show that using PdCl_(2)as a precursor can increase the content of precious metals in the catalyst.The preferred concentration of the templating agent TPAOH/SiO_(2)molar ratio is 0.3.To ensure a yield of 98%,the crystallization time should be no less than 72 hours.Further research reveals a close relationship between catalyst activity and metal valence,indicating that Pd in an oxidized state exhibits better methane oxidation performance.

关 键 词：限域分子筛 甲烷催化氧化 天然气汽车 贵金属 

分 类 号：X701[环境科学与工程—环境工程] TQ426[化学工程]