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介孔La-Co-O钙钛矿型催化剂的制备与性能研究

发表时间:2015-12-15  浏览量:1711  下载量:621
全部作者: 廖晖,黄学辉
作者单位: 武汉理工大学材料科学与工程学院
摘 要: 硅基介孔材料由于具有优良的水热稳定性、高比表面积和大孔容,在利用“反相结构”合成介孔材料时具有明显优势。研究利用水热法制备介孔分子筛SBA-15,然后以其为硬模板,采用硬模板湿法浸渍溶胶-凝胶法制备了LaCoO3钙钛矿型催化剂,探讨了硬模板含量对LaCoO3钙钛矿型催化剂的晶相及比表面积的影响,并研究了催化剂对CO的催化转化效率。结果表明:水热法合成的介孔分子筛SBA-15为六方有序介孔结构,其比表面积高达807 m2/g,具有较窄的孔径分布,最可几孔径为5.6 nm. 硬模板用量对LaCoO3型催化剂的比表面积起着决定性作用,当n(硬模板): n(金属离子)=2:1时,LaCoO3样品的比表面积最大,高达124.14 m2/g,且物相为单一的钙钛矿结构。CO催化活性实验表明,LaCoO3型钙钛矿催化剂比表面积越大,起燃温度越低,催化活性越优良。
关 键 词: 材料科学其他学科;介孔材料;SBA-15;硬模板法;介孔LaCoO3型钙钛矿
Title: Preparation and research of mesoporous perovskite-type La-Co-O
Author: LIAO Hui, HUANG Xuehui
Organization: School of Material Science and Engineering, Wuhan University of Technology
Abstract: Silicon-based mesoporous materials have excellent thermal stability, high specific surface area and large pore volume. It has obvious advantages in the synthesis of mesoporous materials in the use of ‘inverse structure’. The mesoporous molecular sieve SBA-15 was synthesized by hydrothermal method. Then using SBA-15 as hard template, we prepared mesoporous perovskite-type LaCoO3 by the hard-template wet impregnation sol-gel method. The article also researched the influence of template agent content on the crystal phase and the specific surface area of the LaCoO3 perovskite. Finally, the catalytic conversion efficiency for CO gas was studied. The experimental results show that mesoporous molecular sieve SBA-15 has hexagonal ordered mesoporous structure, high specific surface area (807 m2/g) and a narrow pore size distribution (the most probable pore size is 5.6 nm). The content of template agent plays a decisive role in specific surface area of LaCoO3 samples. When the molar ratio between hard template and metal ions is 2:1, LaCoO3 samples which own the largest specific surface area went up to 124.14 m2/g, and keep a single perovskite phase. CO catalytic activity experiments show that the bigger the specific surface area of LaCoO3 perovskite catalyst, the lower the light-off temperature and the better catalytic activity.
Key words: other subjects of material science; mesoporous materials; SBA-15; hard template method; mesoporous perovskite LaCoO3
发表期数: 2015年12月第23期
引用格式: 廖晖,黄学辉. 介孔La-Co-O钙钛矿型催化剂的制备与性能研究[J]. 中国科技论文在线精品论文,2015,8(23):2508-2513.
 
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