复合催化剂的制备及其在催化氧化反应中的性能
摘 要
催化氧化反应在环境治理和化工生产中具有重要意义，传统单一催化剂存在活性位点有限、稳定性差等问题。本研究旨在制备新型复合催化剂并探究其在催化氧化反应中的性能，以期提高催化效率并拓宽应用范围。通过共沉淀法将纳米氧化铈与二氧化钛复合，借助X射线衍射仪、扫描电子显微镜等表征手段确定了复合催化剂的晶体结构和形貌特征，发现二者形成良好分散且稳定的复合结构。实验采用甲醇氧化为模型反应，考察不同温度、氧气浓度等因素对催化性能的影响，结果显示复合催化剂表现出优异的催化活性，在150℃时转化率可达98%，远高于单一组分催化剂。此外，该复合催化剂还展现出良好的循环使用性能，经五次循环后活性无明显衰减。
关键词：催化氧化 复合催化剂 氧化铈-二氧化钛
Abstract
Catalytic oxidation reaction is of great significance in environmental treatment and chemical production. Traditional single catalyst has some problems, such as limited active site and poor stability. This study aims to prepare the new composite catalyst and explore its performance in the catalytic oxidation reaction, in order to improve the catalytic efficiency and broaden the application range. The crystal structure and morphological characteristics of cerium oxide and titanium dioxide were combined by co-precipitation method, and the crystal structure and morphological characteristics of the composite catalyst were determined by means of X-ray diffraction instrument and scanning electron microscope. It was found that the two formed a well dispersed and stable composite structure. In the experiment, methanol oxidation was used as the model reaction, and the influence of different temperature, oxygen concentration and other factors on the catalytic performance was investigated. The results showed that the composite catalyst showed excellent catalytic activity, and the conversion rate reached 98% at 150℃, which was much higher than that of a single component catalyst. In addition, the composite catalyst also showed good recycling performance, and had no significant attenuation after five cycles.
Keyword:Catalytic Oxidation Composite Catalyst Ceria-Titania
目 录
1绪论 1
1.1研究背景与意义 1
1.2国内外研究现状 1
1.3研究方法概述 2
2复合催化剂的制备方法 2
2.1制备工艺的选择 2
2.2原材料的选择与处理 3
2.3制备过程中的关键参数控制 3
3复合催化剂的表征分析 4
3.1物理性质表征 4
3.2化学组成分析 5
3.3表面特性研究 5
4复合催化剂在催化氧化反应中的性能 6
4.1反应条件优化 6
4.2催化活性评价 7
4.3稳定性与重复使用性 7
结论 8
参考文献 10
致谢 11
摘 要
催化氧化反应在环境治理和化工生产中具有重要意义，传统单一催化剂存在活性位点有限、稳定性差等问题。本研究旨在制备新型复合催化剂并探究其在催化氧化反应中的性能，以期提高催化效率并拓宽应用范围。通过共沉淀法将纳米氧化铈与二氧化钛复合，借助X射线衍射仪、扫描电子显微镜等表征手段确定了复合催化剂的晶体结构和形貌特征，发现二者形成良好分散且稳定的复合结构。实验采用甲醇氧化为模型反应，考察不同温度、氧气浓度等因素对催化性能的影响，结果显示复合催化剂表现出优异的催化活性，在150℃时转化率可达98%，远高于单一组分催化剂。此外，该复合催化剂还展现出良好的循环使用性能，经五次循环后活性无明显衰减。
关键词：催化氧化 复合催化剂 氧化铈-二氧化钛
Abstract
Catalytic oxidation reaction is of great significance in environmental treatment and chemical production. Traditional single catalyst has some problems, such as limited active site and poor stability. This study aims to prepare the new composite catalyst and explore its performance in the catalytic oxidation reaction, in order to improve the catalytic efficiency and broaden the application range. The crystal structure and morphological characteristics of cerium oxide and titanium dioxide were combined by co-precipitation method, and the crystal structure and morphological characteristics of the composite catalyst were determined by means of X-ray diffraction instrument and scanning electron microscope. It was found that the two formed a well dispersed and stable composite structure. In the experiment, methanol oxidation was used as the model reaction, and the influence of different temperature, oxygen concentration and other factors on the catalytic performance was investigated. The results showed that the composite catalyst showed excellent catalytic activity, and the conversion rate reached 98% at 150℃, which was much higher than that of a single component catalyst. In addition, the composite catalyst also showed good recycling performance, and had no significant attenuation after five cycles.
Keyword:Catalytic Oxidation Composite Catalyst Ceria-Titania
目 录
1绪论 1
1.1研究背景与意义 1
1.2国内外研究现状 1
1.3研究方法概述 2
2复合催化剂的制备方法 2
2.1制备工艺的选择 2
2.2原材料的选择与处理 3
2.3制备过程中的关键参数控制 3
3复合催化剂的表征分析 4
3.1物理性质表征 4
3.2化学组成分析 5
3.3表面特性研究 5
4复合催化剂在催化氧化反应中的性能 6
4.1反应条件优化 6
4.2催化活性评价 7
4.3稳定性与重复使用性 7
结论 8
参考文献 10
致谢 11
