李俊洁^1,,
刘建英¹,
胡晓东¹,
徐成华¹,
刘盛余¹,
张雪乔¹,
魏荣¹
1.成都信息工程大学资源环境学院，成都 610225
基金项目: 国家自然科学基金资助项目（51608061）
四川省科技厅资助项目（2015JY0113）
成都信息工程大学资助项目（J201712）

Adsorption and catalytic oxidation properties of Pd/ MCM-41 for acetaldehyde in gasohol exhausts

LI Junjie^1,,
LIU Jianying¹,
HU Xiaodong¹,
XU Chenghua¹,
LIU Shengyu¹,
ZHANG Xueqiao¹,
WEI Rong¹
1.College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, China

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摘要:以正硅酸乙酯 (TEOS)为硅源，十六烷基三甲基溴化铵 (CTAB)为模板剂，采用水热合成法制备了MCM-41分子筛，以其为载体采用等体积浸渍法制得Pd/MCM-41催化剂，并用于乙醇汽油车冷启动排放乙醛的净化。采用氮气吸附脱附法(BET)、X射线衍射仪(XRD)、透射电子显微镜(TEM)对Pd/MCM-41理化性能进行表征，并用原位傅里叶变换红外技术研究了Pd/MCM-41在空气氛围下对乙醛的净化机理。结果表明：Pd/MCM-41具有规整的六方孔道、孔径分布均匀、比表面积大的特点；常温下，Pd/MCM-41催化剂可快速吸附乙醛，吸附容量可达105 mg·g-1，而吸附在Pd/MCM-41上的乙醛在180~220 ℃之间即可发生氧化而生成CO2和乙酸。
关键词: Pd/MCM-41/
乙醛/
乙醇汽油/
吸附/
催化氧化

Abstract:MCM-41 is synthesized by hydrothermal method using tetraethyl orthosilicate (TEOS) and cetyltrimethyl ammonium bromide (CTAB) as silicon source and template respectively in the present work. At the same time, Pd/MCM-41 is prepared by impregnation using the obtained MCM-41 as support and applied in the adsorption and catalytic oxidation of acetaldehyde in gasohol exhausts. The physicochemical properties of Pd/MCM-41 are characterized by BET, XRD and TEM, respectively. And in-situ FT-IR technology is adopted to evaluate acetaldehyde adsorption and catalytic oxidation properties on Pd/MCM-41 catalyst under air atmosphere. The results show that Pd/MCM-41 exhibits uniform hexagonal channels with a large specific surface area. And the obtained Pd/MCM-41 catalyst can rapidly adsorb acetaldehyde with an adsorption capacity of about 105 mg·g-1 at room temperature. Meanwhile, acetaldehyde adsorbed on Pd/MCM-41 can be easily oxidized to CO2 and acetic acid at 180 to 220 ℃ in air atmosphere.
Key words:Pd/MCM-41/
acetaldehyde/
gasohol/
adsorption/
catalytic oxidation.

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刊出日期:2018-09-20

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Pd/MCM-41对乙醇汽油车尾气排放乙醛的吸附和催化氧化性能

李俊洁^1,,
刘建英¹,
胡晓东¹,
徐成华¹,
刘盛余¹,
张雪乔¹,
魏荣¹
1.成都信息工程大学资源环境学院，成都 610225
基金项目: 国家自然科学基金资助项目（51608061） 四川省科技厅资助项目（2015JY0113） 成都信息工程大学资助项目（J201712）
关键词: Pd/MCM-41/
乙醛/
乙醇汽油/
吸附/
催化氧化
摘要:以正硅酸乙酯 (TEOS)为硅源，十六烷基三甲基溴化铵 (CTAB)为模板剂，采用水热合成法制备了MCM-41分子筛，以其为载体采用等体积浸渍法制得Pd/MCM-41催化剂，并用于乙醇汽油车冷启动排放乙醛的净化。采用氮气吸附脱附法(BET)、X射线衍射仪(XRD)、透射电子显微镜(TEM)对Pd/MCM-41理化性能进行表征，并用原位傅里叶变换红外技术研究了Pd/MCM-41在空气氛围下对乙醛的净化机理。结果表明：Pd/MCM-41具有规整的六方孔道、孔径分布均匀、比表面积大的特点；常温下，Pd/MCM-41催化剂可快速吸附乙醛，吸附容量可达105 mg·g-1，而吸附在Pd/MCM-41上的乙醛在180~220 ℃之间即可发生氧化而生成CO2和乙酸。

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