Highly stable Co/CeO2 catalyst for high-temperature water–gas shift reaction using a CeO2 support with an optimized precipitant ratio

IF 6.7 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2024-11-25 DOI:10.1016/j.fuel.2024.133777

Beom-Su Cheon , Hak-Min Kim , Jae-Hoon Hwang , Dae-Woon Jeong

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引用次数: 0

Abstract

We report hydrogen production from waste through waste gasification and the water–gas shift reaction using highly stable Co/CeO₂ catalysts. Here, careful control of the KOH:K₂CO₃ precipitant ratio during CeO₂ support synthesis yielded highly active and stable Co/CeO₂ catalysts. Crucially, the precipitant ratio affects the Co dispersion, oxygen vacancies, crystallinity, and Co-CeO₂ interactions, and the Co dispersion increases with increase in KOH content. Further, the oxygen storage capacity improves at the optimal KOH:K₂CO₃ ratio. In addition, the Co-CeO₂ interaction is enhanced when catalysts are synthesized using CeO₂ with a large amount of K₂CO₃. All prepared Co/CeO₂ catalysts show high CO conversion, even at extremely high gas hourly space velocities: the Co/CeO₂ (λ = 2:1 and 1:1.5) catalysts exhibit stable performance because of robust Co-CeO₂ interactions, high oxygen storage capacities, and effective Co dispersions. These findings aid hydrogen production from waste and CeO₂ support design for various catalytic reactions.

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使用具有优化沉淀剂比例的 CeO2 载体的高稳定性 Co/CeO2 高温水气变换反应催化剂

我们报告了使用高度稳定的 Co/CeO2 催化剂通过废物气化和水气变换反应从废物中制氢的情况。在这里，通过在 CeO2 载体合成过程中仔细控制 KOH:K2CO3 的沉淀剂比例，获得了高活性、高稳定性的 Co/CeO2 催化剂。最重要的是，沉淀剂比例会影响 Co 的分散、氧空位、结晶度和 Co-CeO2 的相互作用，而且随着 KOH 含量的增加，Co 的分散也会增加。此外，在 KOH:K2CO3 的最佳比例下，储氧能力会提高。此外，当使用含有大量 K2CO3 的 CeO2 合成催化剂时，Co-CeO2 的相互作用会增强。所有制备的 Co/CeO2 催化剂都显示出较高的 CO 转化率，即使在极高的气体时空速度下也是如此：Co/CeO2（λ = 2:1 和 1:1.5）催化剂表现出稳定的性能，因为它们具有强大的 Co-CeO2 相互作用、较高的储氧能力和有效的 Co 分散。这些发现有助于从废物中制氢，并为各种催化反应设计 CeO2 支持物。

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.