Reverse water-gas shift reaction: steady state isotope switching study of the reverse water-gas shift reaction using in situ DRIFTS and a Pt/ceria catalyst

Jacobs, Gary; Davis, Burtron H.

doi:10.1016/j.apcata.2005.01.013

Cited by 73 publications

(21 citation statements)

References 26 publications

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“…The proposed reaction mechanisms for the reverse water gas shift over ceria-based materials usually involve the adsorption and dissociation of CO 2 on defective ceria surface followed by the formation of surface carbonate and formate species (Goguet et al, 2004; Lin et al, 2018). Surface carbonates are indicated as reaction intermediates, whereas formates are supposed to be “minor intermediates” due to their stronger bond and slower exchange rate observed in transient isotopic experiments (Goguet et al, 2004; Jacobs and Davis, 2005). However, in the recent study by Lin et al the reported rate of decomposition of bidentate carbonates and bidentate formates is similar (Lin et al, 2018).…”

Section: Co2 Hydrogenation To Value Added Chemicals Other Than Methanementioning

confidence: 99%

Ceria-Based Materials in Hydrogenation and Reforming Reactions for CO2 Valorization

2019

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Reducing greenhouse emissions is of vital importance to tackle the climate changes and to decrease the carbon footprint of modern societies. Today there are several technologies that can be applied for this goal and especially there is a growing interest in all the processes dedicated to manage CO 2 emissions. CO 2 can be captured, stored or reused as carbon source to produce chemicals and fuels through catalytic technologies. This study reviews the use of ceria based catalysts in some important CO 2 valorization processes such as the methanation reaction and methane dry-reforming. We analyzed the state of the art with the aim of highlighting the distinctive role of ceria in these reactions. The presence of cerium based oxides generally allows to obtain a strong metal-support interaction with beneficial effects on the dispersion of active metal phases, on the selectivity and durability of the catalysts. Moreover, it introduces different functionalities such as redox and acid-base centers offering versatility of approaches in designing and engineering more powerful formulations for the catalytic valorization of CO 2 to fuels.

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Section: Co2 Hydrogenation To Value Added Chemicals Other Than Methanementioning

confidence: 99%

Ceria-Based Materials in Hydrogenation and Reforming Reactions for CO2 Valorization

2019

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“…In fact, introducing surface Zr IV or Ti IV sites on SiO 2 at the interface with Cu nanoparticles via surface organometallic chemistry (SOMC) increases the CH 3 OH activity and selectivity,f urther supporting the importance of Lewis acid sites in this reaction. [13,14] Regarding CO,i th as mainly been proposed to be formed on copper-based catalysts via two different mechanisms:T he so-called redox and formate pathways.T he former consists of the direct conversion of CO 2 to CO (that may involve M À COOH intermediates) and the subsequent reduction of Cu 2 Osurface species to Cu 0 metal forming H 2 O, while the latter involves the decomposition of formate into CO. [9,[15][16][17][18][19][20][21][22][23][24][25][26][27] Additionally,the formation of not only CO but also CH 3 OH is often proposed to be related to the presence of oxygen defect sites originating from the oxide support. [28][29][30][31][32][33][34][35][36] ForC u/ZnO/Al 2 O 3 ,t he origin of the promotional effect towards selective CH 3 OH formation is still amatter of debate.…”

Section: Introductionmentioning

confidence: 99%

CO₂ Hydrogenation on Cu/Al₂O₃: Role of the Metal/Support Interface in Driving Activity and Selectivity of a Bifunctional Catalyst

et al. 2019

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Selective hydrogenation of CO2 into methanol is a key sustainable technology, where Cu/Al2O3 prepared by surface organometallic chemistry displays high activity towards CO2 hydrogenation compared to Cu/SiO2, yielding CH3OH, dimethyl ether (DME), and CO. CH3OH formation rate increases due to the metal–oxide interface and involves formate intermediates according to advanced spectroscopy and DFT calculations. Al2O3 promotes the subsequent conversion of CH3OH to DME, showing bifunctional catalysis, but also increases the rate of CO formation. The latter takes place 1) directly by activation of CO2 at the metal–oxide interface, and 2) indirectly by the conversion of formate surface species and CH3OH to methyl formate, which is further decomposed into CH3OH and CO. This study shows how Al2O3, a Lewis acidic and non‐reducible support, can promote CO2 hydrogenation by enabling multiple competitive reaction pathways on the oxide and metal–oxide interface.

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“…The *HCOO species has been suggested as an intermediate for Pt-based catalysts in the RWGS reaction [66]. However, it has not been proven that *HCOO is the active surfaceintermediate for CO oxidation by hydroxyl.…”

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confidence: 99%

CO2 hydrogenation on Pt, Pt/SiO2 and Pt/TiO2: Importance of synergy between Pt and oxide support

Kattel

Yan

Chen

et al. 2016

Journal of Catalysis

282

244

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In the current study we combined density functional theory (DFT), kinetic Monte Carlo (KMC) simulations and experimental measurements to gain insight into the mechanisms of CO 2 conversion by hydrogen on the Pt nanoparticle (NP). The results show that in spite of the presence of active, low-coordinated sites, Pt NP alone is not able to catalyze the reaction due to the weak CO 2 binding on the catalyst. Once CO 2 is stabilized, the hydrogenation of CO 2 to CO via the reverse-water-gas shift (RWGS) reaction is promoted; in contrast, the enhancement for further *CO hydrogenation to CH 4 is less significant and no CH 3 OH is observed. The selectivity to CO is mainly determined by CO binding energy and the energetics of *CO hydrogenation to *HCO, while that for CH 4 and CH 3 OH is determined by the competition between hydrogenation and C-O bond scission reactions of the *H 2 COH species. Using SiO 2 and TiO 2 as the support, Pt NP is able to promote the overall CO 2 conversion, while the impact on the selectivity is rather small. The theoretically predicted trend in activity and selectivity is in good agreement with the experimental results. The enhanced activity of Pt/oxide over Pt is originated from the sites at the Pt-oxide interface, where the synergy between Pt and oxide plays an important role.

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Reverse water-gas shift reaction: steady state isotope switching study of the reverse water-gas shift reaction using in situ DRIFTS and a Pt/ceria catalyst

Cited by 73 publications

References 26 publications

Ceria-Based Materials in Hydrogenation and Reforming Reactions for CO2 Valorization

Ceria-Based Materials in Hydrogenation and Reforming Reactions for CO2 Valorization

CO₂ Hydrogenation on Cu/Al₂O₃: Role of the Metal/Support Interface in Driving Activity and Selectivity of a Bifunctional Catalyst

CO2 hydrogenation on Pt, Pt/SiO2 and Pt/TiO2: Importance of synergy between Pt and oxide support

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Reverse water-gas shift reaction: steady state isotope switching study of the reverse water-gas shift reaction using in situ DRIFTS and a Pt/ceria catalyst

Cited by 73 publications

References 26 publications

Ceria-Based Materials in Hydrogenation and Reforming Reactions for CO2 Valorization

Ceria-Based Materials in Hydrogenation and Reforming Reactions for CO2 Valorization

CO2 Hydrogenation on Cu/Al2O3: Role of the Metal/Support Interface in Driving Activity and Selectivity of a Bifunctional Catalyst

CO2 hydrogenation on Pt, Pt/SiO2 and Pt/TiO2: Importance of synergy between Pt and oxide support

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CO₂ Hydrogenation on Cu/Al₂O₃: Role of the Metal/Support Interface in Driving Activity and Selectivity of a Bifunctional Catalyst