{"title":"Exploring the role of PdO and oxygen vacancies of Pd/CeO2 in bicarbonate hydrogenation","authors":"Hyun-Wook Jeong , Gwang-Nam Yun , Youn-Sang Bae , Kyung-Ryul Oh , Young Kyu Hwang","doi":"10.1016/j.jcou.2025.103028","DOIUrl":null,"url":null,"abstract":"<div><div>The hydrogenation of bicarbonates in aqueous solutions using a Pd-based catalyst is an effective method for the production of formate. Herein, we synthesized finely dispersed Pd/CeO<sub>2</sub> catalysts via a two-step calcination method and evaluated their catalytic activities before and after the reduction process. The unreduced Pd/CeO<sub>2</sub> catalyst exhibited significantly higher activity for bicarbonate hydrogenation than the reduced catalyst. Although the activity declined after multiple cycles, regeneration via calcination effectively restored activity by converting metallic Pd back to highly active PdO. In addition, Pd incorporation and reaction conditions increased Ce<sup>3 +</sup> contents and oxygen vacancies in CeO<sub>2</sub>, enhancing bicarbonate adsorption and catalytic performance. These findings highlight the roles of PdO and oxygen vacancies in the CeO<sub>2</sub> support in the catalytic activity of Pd/CeO<sub>2</sub> catalysts for bicarbonate hydrogenation.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"92 ","pages":"Article 103028"},"PeriodicalIF":7.2000,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of CO2 Utilization","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2212982025000125","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The hydrogenation of bicarbonates in aqueous solutions using a Pd-based catalyst is an effective method for the production of formate. Herein, we synthesized finely dispersed Pd/CeO2 catalysts via a two-step calcination method and evaluated their catalytic activities before and after the reduction process. The unreduced Pd/CeO2 catalyst exhibited significantly higher activity for bicarbonate hydrogenation than the reduced catalyst. Although the activity declined after multiple cycles, regeneration via calcination effectively restored activity by converting metallic Pd back to highly active PdO. In addition, Pd incorporation and reaction conditions increased Ce3 + contents and oxygen vacancies in CeO2, enhancing bicarbonate adsorption and catalytic performance. These findings highlight the roles of PdO and oxygen vacancies in the CeO2 support in the catalytic activity of Pd/CeO2 catalysts for bicarbonate hydrogenation.
期刊介绍:
The Journal of CO2 Utilization offers a single, multi-disciplinary, scholarly platform for the exchange of novel research in the field of CO2 re-use for scientists and engineers in chemicals, fuels and materials.
The emphasis is on the dissemination of leading-edge research from basic science to the development of new processes, technologies and applications.
The Journal of CO2 Utilization publishes original peer-reviewed research papers, reviews, and short communications, including experimental and theoretical work, and analytical models and simulations.