在CuO/CeO2催化剂上的La2O3添加物的影响 对于水气转移反应的催化剂
Tatiana de Freitas Silva1, José Mansur Assaf1, Alessandra Fonseca Lucrédio2
1Federal University of São Carlos, São Carlos-SP 13565-905, Brazil.
Langmuir : the ACS journal of surfaces and colloids
|January 30, 2025
概括
兰氧化物 (La2O3) 兴奋剂增强了水气转移反应的氧化铜/氧化 (CuO/CeO2) 催化剂,提高了在更高温度下的性能和稳定性.
科学领域:
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 水气转移反应对于气生产至关重要.
- 开发稳定高效的催化剂对于工业应用至关重要.
- 氧化铜/氧化 (CuO/CeO2) 催化剂表现有希望,但需要优化.
研究的目的:
- 合成和评估CuO/CeO2和La2O3修饰的CuO/CeO2催化剂.
- 研究La2O3对催化剂结构和性能的影响.
- 评估反应条件下的催化剂稳定性.
主要方法:
- 具有不同CeO2和La2O3摩尔比率的催化剂的热水合成.
- 使用X射线吸收近边缘结构 (XANES) 和现场X射线衍射 (XRD) 的表征.
- 在150-350°C的水气转移反应中进行催化试验.
主要成果:
- 添加La2O3降低了表面积和铜分散.
- 在还原和反应过程中确认了金属Cu物种.
- 在低温下CuO/CeO2是最佳的;在250-350°C时,La2O3化催化剂表现出色.
- 在更高的温度范围内,CuO/1CeO2-1La2O3表现出优越的性能.
结论:
- 氧化对CuO/CeO2.3的结构和催化性能产生重大影响.
- 兰改性催化剂在高温下表现出增强的活性和稳定性.
- 这些催化剂表现出更好的抗失活和烧结的抵抗力,即使存在CO2和H2.
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