重组Co-CoO与Co/Nb-CeO2中的定位率的接口,以提高水气转换性能
Sanjay Singh Negi1, Hak-Min Kim1, Beom-Su Cheon2
1Industrial Technology Research Center, Changwon National University, 20 Changwondaehak-ro, Changwon, Gyeongnam 51140, Republic of Korea.
ACS applied materials & interfaces
|October 30, 2023
概括
---催化剂通过水气转移反应有效地产生. 在5毫升/分钟的最佳催化剂合成中,添加沉积物会产生小的,分散的颗粒,用于增强生成.
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:
- 通过水气转移反应 (WGS) 生产对于各种工业应用至关重要.
- 改性 (CeO2) 催化剂对WGS有希望,但它们的性能对制备方法敏感.
研究的目的:
- 为了研究沉物添加率在共沉期间对Co/Nb-CeO2催化剂的合成的影响.
- 通过WGS反应评估这些催化剂的生成性能.
主要方法:
- 合成Co/Nb-CeO2催化剂使用不同沉剂添加率 (1,5,15,25毫升/分钟) 的共沉.
- 使用诸如X射线光电子光谱 (XPS),X射线吸收光谱 (XAS) 和拉曼光谱等技术进行表征.
- 在高气体每小时空间速度 (315.282 h−1) 时对WGS反应的催化活性和稳定性的评估.
主要成果:
- 用5毫升/分钟 (5-Co/Nb-CeO2) 制备的催化剂表现出分散的小颗粒 (3-8纳米),具有强烈的Co-CeO2相互作用.
- 这种最佳的催化剂表现出9.8s-1的高周转频率,并实现了热力学平衡转换.
- 5Co/Nb-CeO2催化剂在168小时内表现稳定,这是由于稳定的CO-Coδ+中间体形成.
结论:
- 沉物添加率显著影响颗粒大小,分散和CeO2的相互作用,影响WGS性能.
- 5Co/Nb-CeO2催化剂对于从合成气中产生气非常有效,提供了稳定高效的解决方案.
- 该研究强调了控制合成对于开发WGS的先进催化剂的重要性.
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