甲醇燃料车尾气净化催化剂的研究Ⅱ.甲醇深度氧化用银催化剂上吸附物种的原位红外研究  

STUDY ON CATALYSTS FOR METHANOLFUELED VEHICLE EXHAUST CONTROL Ⅱ. Investigation of Adsorbed Species on Ag/γAl_2O_3 by in situ FTIR

作　　者：朱兵[1] 汪仁[1] 

机构地区：[1]华东理工大学工业催化研究所

出　　处：《催化学报》1997年第6期463-467,共5页

基　　金：国家教委博士点基金

摘　　要：利用原位红外技术研究了ＣＨ３ＯＨ，ＣＯ，Ｏ２等在５％Ａｇ／γＡｌ２Ｏ３上的吸附情况及ＣＨ３ＯＨ和Ｏ２共吸附时表面物种的变化．结果表明，在表面纯净的Ａｇ／γＡｌ２Ｏ３催化剂上，甲醇的解离吸附仅发生在γＡｌ２Ｏ３上；表面预吸附氧后，可大大增强Ａｇ对ＣＨ３ＯＨ的解离吸附，当吸附的［ＣＨ３Ｏ］与［Ｏ］在Ａｇ／γＡｌ２Ｏ３上相互作用时，出现吸附态甲醛、甲二氧基、甲酸根等中间物种．Ｏ２在Ａｇ／γＡｌ２Ｏ３上存在非解离吸附（Ｏ－２），在真空中较易脱附，但在氧气氛下可于１００℃时稳定存在．By in situ FTIR technique, methanol adsorption and oxidation on Ag/γAl_2O_3 catalyst for methanol deep oxidation have been studied. It was found that the clear Ag surface doesn't dissociatively adsorb CH3OH, but can admit the methoxy coming from the surface of γAl_2O_3. When the surface of Ag/γAl_2O_3 preadsorbed with oxygen, during the temperatureprogrammed methanol oxidation, there are adsorbate formaldehyde (2780, 2710, 1702 cm-1), dioxymethylene (1109, 916 cm-1) and formate species (1580, 1554, 1376 cm-1) on the catalyst surface, but no adsorbate CO.

关 键 词：甲醇燃料 银催化剂 汽车尾气净化 深度氧化 

分 类 号：X511.06[环境科学与工程—环境工程] O643.36[理学—物理化学]