Water–Gas Shift Reaction on K/Cu(111) and Cu/K/TiO2(110) Surfaces: Alkali Promotion of Water Dissociation and Production of H2
- Brookhaven National Lab. (BNL), Upton, NY (United States); SUNY Stony Brook, Stony Brook, NY (United States)
- Univ. de Sevilla, Sevilla (Spain)
- Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. Central de Venezuela, Caracas (Venezuela); Zoneca-CENEX, R&D Labs, Monterrey, (Mexico)
- SUNY Stony Brook, Stony Brook, NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
The addition of potassium atoms to Cu(111) and Cu/TiO2(110) surfaces substantially enhances the rate for water dissociation and the production of hydrogen through the water–gas shift reaction (WGS, CO + H2O → H2 + CO2). In the range of temperatures investigated, 550–625 K, Cu/K/TiO2(110) exhibits a WGS activity substantially higher than those of K/Cu(111), Cu(111), and Cu/ZnO(000$$\bar{1}$$) systems used to model an industrial Cu/ZnO catalyst. The apparent activation energy for the WGS drops from 18 Kcal/mol on Cu(111) to 12 Kcal/mol on K/Cu(111) and 6 Kcal/mol on Cu/K/TiO2(110). The results of density functional calculations show that K adatoms favor the thermochemistry for water dissociation on Cu(111) and Cu/TiO2(110) with the cleavage of an O–H bond occurring at room temperature. Furthermore, at the Cu/K/TiO2 interface, there is a synergy, and this system has a unique ability to dissociate the water molecule and catalyze hydrogen production through the WGS process. Therefore, when optimizing a regular catalyst, it is essential to consider mainly the effects of an alkali promoter on the metal–oxide interface.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 1572352
- Report Number(s):
- BNL-212267-2019-JAAM
- Journal Information:
- ACS Catalysis, Vol. 9, Issue 12; ISSN 2155-5435
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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