CO and CO2 hydrogenation over metal oxides: a comparison of ZnO, TiO2 and ZrO2
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Cited by (42)
Role of interfacial oxygen vacancies in low-loaded Au-based catalysts for the low-temperature reverse water gas shift reaction
2023, Applied Catalysis B: EnvironmentalOxygen vacancies in Cu/TiO<inf>2</inf> boost strong metal-support interaction and CO<inf>2</inf> hydrogenation to methanol
2022, Journal of CatalysisCitation Excerpt :For the CO2-DRIFT experiments, the in-situ reduced catalysts were exposed to the CO2 gas, and the DRIFT spectra were recorded at 50 °C. As shown in Fig. 8a and 8b, the exposure to the CO2 gas resulted in the appearance of the adsorption band around 1670 and 1530 cm−1 on the Cu/TiO2-0 and Cu/TiO2-x-500 catalysts, corresponding to the bicarbonate vas(OCO) (1654 cm−1), carboxylate vas(OCO) (1589 cm−1) and bidentate formate vas(OCO) (1564 cm−1), probably originating from the CO2 adsorption on the oxygen vacancies on the support surface [81–83]. Cu/TiO2-x-500 showed a higher amount of the adsorbed-CO2 species than that of the Cu/TiO2-0, although the surface area of Cu/TiO2-x-500 was ca. 60% of that of Cu/TiO2-0 (Table 1).
Comparative study of CO adsorption on zirconia polymorphs with DRIFT and transmission FT-IR spectroscopy
2018, Applied Surface ScienceCitation Excerpt :In the case of t-ZrO2, the appearance of CO band above 573 K was accompanied with the appearance of bicarbonate species. The formation of bicarbonate species could be formulated as Scheme 2 [32]. Hydroxyls were consumed and the cationic sites M2 were released.
In situ infrared study of formate reactivity on water-gas shift and methanol synthesis catalysts
2015, Comptes Rendus ChimieCitation Excerpt :For methanol synthesis under industrial conditions (50 bar total pressure), a surface formate coverage as high as 7% was calculated using a microkinetic model [60]. Surface formates were observed to convert to methanol and with methoxy species to methyl formate on ZnO and ZrO2 in the presence of hydrogen after CO2 adsorption [10,59]. ZnO is known to be active for methanol synthesis, since the first commercial catalysts were based on ZnO/Cr2O3, without copper [61].