碳酸二甲酯在锌铝复合氧化物上分解行为的红外研究

吴孝敏; 康敏; 李磊; 赵宁; 魏伟; 孙予罕; 张炳胜

碳酸二甲酯在锌铝复合氧化物上分解行为的红外研究

吴孝敏^1,2,
康敏^1,2,
李磊¹,
赵宁^1,,
魏伟³,
孙予罕^1,4,
张炳胜⁵

1.
中国科学院山西煤炭化学研究所煤转化国家重点实验室, 山西太原 030001;
2.
中国科学院大学, 北京 100049;
3.
中国科学院上海高等研究院温室气体与环境工程研究中心, 上海 201203;
4.
中国科学院上海高等研究院低碳转化中心, 上海 201203;
5.
肥城阿斯德化工有限公司, 山东肥城 271600

基金项目: 中国科学院院地合作项目。

详细信息

通讯作者:
赵宁，Tel：0351-4049612，E-mail：zhaoning@sxicc.ac.cn

中图分类号: O643.3
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出版历程
- 收稿日期: 2013-10-18
- 修回日期: 2013-12-21
- 刊出日期: 2014-03-31

In-situ IR study of thermal decomposition of dimethyl carbonate over Zn/Al mixed oxide catalysts

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
2.
University of Chinese Academy of Sciences, Beijing 100049, China;
3.
Center for Greenhouse Gas and Environmental Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201203, China;
4.
Low Carbon Conversion Center, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201203, China;
5.
Shandong ACID Chemicals Co., LTD, Feicheng 271600, China

摘要

摘要: 采用尿素热分解法制备锌铝水滑石，1 073 K下煅烧得到相应的锌铝复合氧化物催化剂。通过XRD谱图确定锌铝复合氧化物ZAO-3（1 073 K）催化剂的组分为ZnO相和ZnAl₂O₄尖晶石相。NH₃（CO₂）-TPD结果表明，当向ZnO中引入Al后，催化剂的酸碱性位和酸碱性强度都发生改变。采用原位红外（in-situ FT-IR）手段，研究了碳酸二甲酯（DMC）分别在ZAO-3（1 073 K）、ZnAl₂O₄、ZnO上随着温度变化的分解行为。结果表明，ZAO-3（1 073 K）催化剂上大量的弱酸碱性位协同稳定DMC，抑制DMC的分解。
- 碳酸二甲酯 /
- 锌铝复合氧化物 /
- 热分解 /
- 原位红外
Abstract: ZnO, ZnAl₂O₄ and Zn/Al mixed oxide catalysts were prepared by thermal decomposition of hydrotalcite-like layered precursors derived from urea precipitation at 1 073 K. Both ZnAl₂O₄and ZnO phases were observed in ZAO-3 catalyst at 1 073 K from XRD patterns. The NH₃-TPD and CO₂-TPD results revealed that the acidity and basicity of Zn/Al mixed oxide catalysts changed with the introduction of Al. Combined with the in-situ FT-IR results of dimethyl carbonate (DMC) decomposition over ZAO-3(1 073 K), ZnAl₂O₄, ZnO at various temperatures, it was found that the synergistic effect between acidic and basic sites over ZAO-3(1 073 K) could stabilize DMC molecules and inhibit the decomposition of DMC.
- dimethyl carbonate /
- Zn/Al mixed oxide /
- thermal decomposition /
- in-situ FT-IR

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参考文献(9)

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