Zn促进了GaZrOx三级固体溶液氧化物与SAPO-34相结合,有效地将CO2转化为具有低CO选择性的轻烯酸
Shike Liu1,2,3, Kun Yang1,2,3, Qixia Ren1,2,3
1Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, Guizhou, 550025, China.
Chemistry (Weinheim an der Bergstrasse, Germany)
|May 10, 2024
概括
一种新的ZnGaZrOx/SAPO-34合催化剂有效地将CO2转化为轻烯. 这种催化剂增强了CO2的激活,并抑制了逆水气转移反应,从而实现了对有价值的烯的高选择性.
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:
- 二氧化碳化对于可持续的化学生产至关重要.
- 从二氧化碳中生产轻烯酸的有效催化剂的开发是一个重大挑战.
- 双重催化提供了一个有前途的途径,以增强反应途径和选择性.
研究的目的:
- 开发一种高性能双联催化剂,用于二氧化碳化为轻烯酸.
- 调查Zn在GaZrO中的兴奋作用 (x) 和其与SAPO-34.4的组合.
- 优化催化剂成分和反应条件,以提高性能和选择性.
主要方法:
- 合成ZnGaZrO(x) 三元氧化物,含有不同Zn的含量.
- 通过优化复合材料方法制备ZnGaZrO ((x) /SAPO-34合催化剂.
- 催化剂性能的表征,包括表面积,多孔度和活性点.
- 对二氧化碳化中的催化性能进行评估,重点关注转化,选择性和产量.
- 反应机制的分析,包括CO2激活和抑制逆水气转移 (RWGS) 反应.
主要成果:
- 优化的3.5%ZnGaZrO ((x) /SAPO-34催化剂表现出极好的催化性能.
- 实现了26.6%的二氧化碳转化,对C2=C4=轻烯具有82.1%的选择性,轻烯产量为11.8%.
- 在GaZrO中Zn兴奋剂 (x) 增强了H2溢出,并产生了氧气空缺,促进了CO2的激活.
- 双重催化剂在高温下有效抑制了RWGS反应,在390°C时,CO选择性低至46.1%.
结论:
- 开发的ZnGaZrO ((x) /SAPO-34合催化剂在二氧化碳化到轻烯的过程中非常有效.
- 纳入GaZrO(x) 是提高催化活性和选择性的关键.
- 催化剂设计成功地平衡了二氧化碳转化与抑制RWGS等不良副作用.
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