了解Zr-MOF支持结构在模板二极管CO2上的作用 化催化剂结构和活动
Oliver M Linder-Patton1, Lizhuo Wang2, Jack D Evans1
1Department of Chemistry, School of Physics, Chemistry and Earth Sciences, University of Adelaide, Adelaide, South Australia 5000, Australia.
金属有机框架 (MOF) 模板铜氧化物催化剂用于二氧化碳化. 催化剂的性能取决于MOF结构和激活温度,优化的MOF可以改善甲醇的形成.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 化学工程是化学工程的重要组成部分.
背景情况:
- 金属有机框架 (MOF) 提供可调节的结构,高表面积和稳定性,使它们成为催化剂的理想支.
- MOF (Zr-MOF) 为控制催化剂化学和形态提供了多种结构选择.
- MOF衍生催化剂 (MDC) 对二氧化碳化具有前景,但它们的性能与前体MOF的特性有关.
研究的目的:
- 使用MOF基预催化剂合成三元CO2化催化剂.
- 研究MOF结构特征 (微孔与中孔) 对催化剂结构和活性的影响.
- 了解催化剂形成过程中MOFs在现场的结构转变及其对二氧化碳化的影响.
主要方法:
- 使用UIO-66 (微孔),MIP-206 (半孔) 和NU-1000 (半孔) 模板制备Cu/ZnO@Zr-MOF预催化剂.
- 在不同反应温度 (200-250°C) 和压力 (40bar) 下与H2/CO2混合物进行预催化剂的现场表征.
- 对甲醇形成的催化活性和选择性的评估.
主要成果:
- Cu/ZnO@Zr-MOF预催化剂表现出温度依赖的现场结构转变.
- 微孔性UiO-66转化为ZrO2,Cu分散受到支转化率的影响.
- 半孔MIP-206和NU-1000在ZrO2上模拟Cu纳米粒子;MIP-206在更高的温度下也转化为ZrO2.
- 催化剂活性和选择性因MOF模板和制备温度而异.
- MIP-206和UiO-66衍生催化剂在更高温度 (250°C) 上显示出更好的甲醇形成.
- 由于孔隙堵塞,NU-1000衍生催化剂的活性降低.
结论:
- 选择Zr-MOF前体显著影响MOF衍生的CO2化催化剂的结构和性能.
- 优化MOF结构指标和现场激活条件对于开发高性能催化剂至关重要.
- 仔细选择MOF模板和反应参数可以提高甲醇生产的选择性和活性.
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