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The Potassium-Induced Decomposition Pathway of HCOOH on Rh(111)
| Content Provider | MDPI |
|---|---|
| Author | Imre, Kovács Zolt, án Kónya Kiss, János |
| Copyright Year | 2020 |
| Description | 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. |
| Starting Page | 675 |
| e-ISSN | 20734344 |
| DOI | 10.3390/catal10060675 |
| Journal | Catalysts |
| Issue Number | 6 |
| Volume Number | 10 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2020-06-16 |
| Access Restriction | Open |
| Subject Keyword | Catalysts Atomic, Molecular and Chemical Physics Formic Acid Decomposition Formate Intermediate Potassium Adatom Rh Surfaces |
| Content Type | Text |
| Resource Type | Article |
