氧化H2和CO在离子交换X和Y化物上的氧化
Daniel G Lahr1, Junhui Li, Robert J Davis
1Department of Chemical Engineering, University of Virginia, Charlottesville, Virginia 22904-4741, USA.
Journal of the American Chemical Society
|February 27, 2007
概括
与交换的化物显示出对和一氧化碳氧化物的催化活性增强. 过渡金属杂质,如铁,可能在热酸盐氧化催化过程中发挥重要作用.
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
- 无机化学 无机化学
背景情况:
- 泽奥利特X和Y是广泛研究的微孔材料.
- 性金属子影响着热的催化性能.
- 氧化反应在各种化学过程中至关重要.
研究的目的:
- 合成和表征IA组的化交换的化物X和Y.
- 评估它们在H2和CO氧化中的催化活性和选择性.
- 调查阴离子交换和杂质对催化性能的影响.
主要方法:
- 化和化的水性离子交换与IA组的化物.
- 在473573K时对H2和CO氧化的催化试验.
- 同位素过渡分析用于研究反应中间体和动力学.
主要成果:
- 交换的化物X (CsX) 在H2和CO氧化中表现出最高的活性.
- 赫克斯氧化显示出最少的活动.
- 在金属交换的化物上,二氧化碳的氧化具有高度选择性 (~80%).
- 在CsX的增强活动与更高的反应性中间体覆盖率有关,而不是速率常数.
- 铁杂质水平与氧化活性相关,表明具有催化作用.
结论:
- 交换的化石是H2和CO氧化的有希望的催化剂.
- 催化活性受到阴离子类型的影响,并可能受到过渡金属杂质的影响.
- 需要进一步研究杂质在热酸盐催化中的作用.
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