Atomically dispersed Pt/CeO2 catalyst with superior CO selectivity in reverse water gas shift reaction

Zhao, Zhiying; Wang, Mingzhi; Ma, Peijie; Zheng, Yanping; Chen, Jiayu; Li, Huiqi; Zhang, Xibo; Zheng, Kun; Kuang, Qin; Xie, Zhaoxiong

doi:10.1016/j.apcatb.2021.120101

Cited by 116 publications

(67 citation statements)

References 59 publications

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“…Several supported metals including Pd, 123,124 Pt, 100,[125][126][127] Rh, [128][129][130] Au, 122,131,132 Fe, 133,134 Ni, 47,94,135 and Cu, 136,137 have been reported as active catalysts for the RWGS reaction. In addition, supported metal alloys, such as Pd-In/SiO 2 , 138 125 namely the redox mechanism [142][143][144] and carboxyl (COOH*) mechanism.…”

Section: Reverse Water-gas Shift (Rwgs)mentioning

confidence: 99%

Mechanistic and multiscale aspects of thermo-catalytic CO₂conversion to C₁products

Alam

Cheula

Moroni

et al. 2021

Catal. Sci. Technol.

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Section: Reverse Water-gas Shift (Rwgs)mentioning

confidence: 99%

Mechanistic and multiscale aspects of thermo-catalytic CO₂conversion to C₁products

Alam

Cheula

Moroni

et al. 2021

Catal. Sci. Technol.

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“…Previous studies suggested that the metal sites in supported metal/oxide catalysts were able to dissociate hydrogen (H 2 ), while the oxide and the metal–oxide interface were responsible for the adsorption and activation of CO 2 . − Therefore, the type of oxide support and the construction of the metal–oxide interface were also important to promote the performance of CO 2 methanation . Titanium dioxide (TiO 2 ) has been widely used as the catalyst support in thermocatalysis due to its low price, high stability, and abundant oxygen vacancies. − Liu and co-workers highlighted the importance of oxygen vacancies for the adsorption of CO 2 , showing that CO 2 bonds weakly on the surface of a silica-supported platinum catalyst (Pt/SiO 2 ) due to the nonreducibility of SiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Rutile Content on the Catalytic Performance of Ru/TiO₂ Catalyst for Low-Temperature CO₂ Methanation

Zhao

Jiang

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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Hydrogenation of carbon dioxide (CO2) to methane (CH4) bears the potential not only to alleviate excessive emission of CO2 but to produce clean energy for direct use. However, due to the high temperature required for the activation of CO2, it is necessary to develop a catalyst with high activity and high CH4 selectivity at low reaction temperature for CO2 methanation. In this study, we synthesized titanium dioxide (TiO2) supports with different rutile contents by calcination and investigated the relationship between the rutile content of TiO2 supports in Ru/TiO2 catalysts and their performance for low-temperature CO2 methanation. The characterization results indicated that Ru species grew preferentially on the rutile phase of the support TiO2, and the interaction between Ru species and TiO2 became stronger with increasing rutile content. In addition, the concentration of oxygen vacancies on the support, which would provide more adsorption sites for CO2, increased with the decreasing rutile content. The best reactivity was achieved with a rutile content between 15% and 30%. This work included a thorough investigation on the effect of rutile content on the performance of low-temperature CO2 methanation and provided guidance for the preparation of Ru/TiO2 catalyst with high activity.

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“…In particular, the CO selectivity of 0.4 wt % Pt/Fe 3 O 4 decreased from 100% at 250 °C to 49.4% at 350 °C. According to previous studies, Pt nanoparticle size dramatically affects the adsorption and hydrogenation of CO on Pt. − Large-sized Pt nanoparticles were conducive to forming CH 4 . Therefore, it is deduced that the decrease in CO selectivity was caused by the increase of Pt particle size (Figure S5).…”

Section: Resultsmentioning

confidence: 93%

“…Strikingly, a broad band centered at ∼1940 cm –1 , attributed to the stretching vibration of CO, was also detected. , The increasing intensity of this peak with increasing temperature suggests a growing concentration of CO over the catalytic surface, which would accelerate the accumulation of carbon species via the Boudouard reaction (2CO* → C* + CO 2 *) . The strong band centered at ∼1670 cm –1 was attributed to H 2 O molecules, suggesting that H 2 O was easily produced in this catalytic system. All of these results demonstrate that Pt significantly accelerated the dynamic reduction/oxidation/carbonization processes of the RWGS reaction to improve the reaction activity.…”

Section: Resultsmentioning

confidence: 99%

Dynamic Phase Transition of Iron Oxycarbide Facilitated by Pt Nanoparticles for Promoting the Reverse Water Gas Shift Reaction

et al. 2021

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The catalytic activation of CO2 is a crucial process in CO2 recycling for both fundamental research and industrial applications. Fe-based catalysts have been demonstrated to be highly active for the reverse water gas shift (RWGS) reaction. However, the structural complexity and dynamic reduction/oxidation/carburization of iron-based catalysts mean that it is challenging to understand the mechanism of these catalysts and further improve their reaction activity. Herein, we report a highly efficient Pt/Fe3O4 catalyst for the RWGS reaction, in which the content of Pt is only 0.017 wt %. The CO2 conversion rate reaches 46.9 × 10–5 molCO2 /(gcat s) with a CO selectivity of up to 99.7% at reaction conditions of 500 °C and atmospheric pressure. Structure–performance investigations reveal that the reduction process of Fe-based supports can be enhanced by the in situ formation of Pt nanoparticles, which significantly promote the dynamic phase transition of Fe3O4 to Fe3C via carburization and thus considerably improve CO2 activation. The synergistic interaction of Pt with Fe-oxycarbide improves catalytic activity and ensures long-term catalytic stability. This simple strategy by improving the reduction process of Fe-based catalysts to promote carburization provides an alternative way to manipulate the activity and selectivity of Fe-based catalysts in CO2 hydrogenation.

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Atomically dispersed Pt/CeO2 catalyst with superior CO selectivity in reverse water gas shift reaction

Cited by 116 publications

References 59 publications

Mechanistic and multiscale aspects of thermo-catalytic CO₂conversion to C₁products

Mechanistic and multiscale aspects of thermo-catalytic CO₂conversion to C₁products

Effect of Rutile Content on the Catalytic Performance of Ru/TiO₂ Catalyst for Low-Temperature CO₂ Methanation

Dynamic Phase Transition of Iron Oxycarbide Facilitated by Pt Nanoparticles for Promoting the Reverse Water Gas Shift Reaction

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Atomically dispersed Pt/CeO2 catalyst with superior CO selectivity in reverse water gas shift reaction

Cited by 116 publications

References 59 publications

Mechanistic and multiscale aspects of thermo-catalytic CO2conversion to C1products

Mechanistic and multiscale aspects of thermo-catalytic CO2conversion to C1products

Effect of Rutile Content on the Catalytic Performance of Ru/TiO2 Catalyst for Low-Temperature CO2 Methanation

Dynamic Phase Transition of Iron Oxycarbide Facilitated by Pt Nanoparticles for Promoting the Reverse Water Gas Shift Reaction

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Mechanistic and multiscale aspects of thermo-catalytic CO₂conversion to C₁products

Mechanistic and multiscale aspects of thermo-catalytic CO₂conversion to C₁products

Effect of Rutile Content on the Catalytic Performance of Ru/TiO₂ Catalyst for Low-Temperature CO₂ Methanation