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Abstract
Formic acid (FA) can be considered both a CO and a H2 carrier via selective dehydration and dehydrogenation pathways, respectively. The two processes can be influenced by the modification of the active components of the catalysts used. In the present study the adsorption of FA and the decomposition of the formed formate intermediate were investigated on potassium promoted Rh(111) surfaces. The preadsorbed potassium markedly increased the uptake of FA at 300 K, and influenced the decomposition of formate depending on the potassium coverage. The work function (Δϕ) is increased by the adsorption of FA on K/Rh(111) at 300 K suggesting a large negative charge on the chemisorbed molecule, which could be probably due to the enhanced back-donation of electrons from the K-promoted Rh into an empty π orbital of HCOOH. The binding energy of the formate species is therefore increased resulting in a greater concentration of irreversibly adsorbed formate species. Decomposition of the formate species led to the formation of H2, CO2, H2O, and CO, which desorbed at significantly higher temperatures from the K-promoted surface than from the K-free one as it was proven by thermal desorption studies. Transformation of surface formate to carbonate (evidenced by UPS) and its decomposition and desorption is responsible for the high temperature CO and CO2 formation.
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Yu Z, An X, Kurnia I, Yoshida A, Yang Y, Hao X, Abudula A, Fang Y, Guan G. Full Spectrum Decomposition of Formic Acid over γ-Mo2N-Based Catalysts: From Dehydration to Dehydrogenation. ACS Catal 2020. [DOI: 10.1021/acscatal.0c00752] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Zhongliang Yu
- School of Chemistry and Environmental Science, Shangrao Normal University, Shangrao 334001, China
- Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030021, China
- Energy Conversion Engineering Laboratory, Institute of Regional Innovation (IRI), Hirosaki University, 2-1-3 Matsubara, Aomori 030-0813, Japan
| | - Xiaowei An
- Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8560, Japan
| | - Irwan Kurnia
- Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8560, Japan
| | - Akihiro Yoshida
- Energy Conversion Engineering Laboratory, Institute of Regional Innovation (IRI), Hirosaki University, 2-1-3 Matsubara, Aomori 030-0813, Japan
- Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8560, Japan
| | - Yanyan Yang
- School of Chemistry and Environmental Science, Shangrao Normal University, Shangrao 334001, China
- Department of Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Xiaogang Hao
- Department of Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Abuliti Abudula
- Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8560, Japan
| | - Yitian Fang
- Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030021, China
| | - Guoqing Guan
- Energy Conversion Engineering Laboratory, Institute of Regional Innovation (IRI), Hirosaki University, 2-1-3 Matsubara, Aomori 030-0813, Japan
- Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8560, Japan
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