Promotion effect of ultraviolet light on NO + CO reaction over Pt/TiO2 and Pt/CeO2–TiO2 catalysts

Huang, Kun; Lin, Liuliu; Yang, Kai; Dai, Wenxin; Chen, Xun; Fu, Xianzhi

doi:10.1016/j.apcatb.2015.05.044

Cited by 69 publications

(24 citation statements)

References 51 publications

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“…An et al [10,11] suggested that photothermal catalytic synergism mainly stems from the photocatalytic acceleration of the Mars-van Krevelen redox cycle, enhanced light harvesting, improved charge separation, an increased capacity for reactive oxygen, or enhancement of the lattice oxygen activity of the material [12]. Furthermore, Yang et al [13][14][15] showed that for the oxide-supported M-TiO2 (M = Au/Ru/Pt) catalyst under photothermal conditions, photoinduced electrons are transferred to the M surface from TiO2 to increase the surface electron density on the M sites. This enhanced the adsorption and activation of the CO/CO2/NO molecules at the M sites, which promoted the reactivity of catalysts.…”

Section: Introductionmentioning

confidence: 99%

Thermo-driven photocatalytic CO reduction and H2 oxidation over ZnO via regulation of reactant gas adsorption electron transfer behavior

Wang

et al. 2021

Chinese Journal of Catalysis

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Photothermal catalysis is a widely researched field in which the reaction mechanism is usually investigated based on the photochemical behavior of the catalytic material. Considering that the adsorption of reactants is essential for catalytic reactions to occur, in this study, the synergistic effect of photothermal catalysis is innovatively elucidated in terms of the electron transfer behavior of reactant adsorption. For the H2 + O2 or CO + H2 reaction systems over a ZnO catalyst, UV irradiation at 25 °C or heat without UV irradiation did not cause H2 oxidation or CO reduction; only photothermal conditions (100 or 150 °C + UV light) initiated the two reactions. This result is related to the electron transfer behavior associated with the adsorption of CO or H2 on ZnO, in which H2 or CO that lost an electron could be oxidized by O2 or hydroxyls. However, the electron-accepting CO could be reduced by the electron-donating H2 into CH4 under photothermal conditions. Based on the in-situ characterization and theoretical calculation results, it was established that the synergistic effect of the photothermal conditions acted on the (002) crystal surface of ZnO to stimulate the growth of zinc vacancies, which resulted in the formation of defect energy levels, adsorption sites, and an adjusted Fermi level. As a result, the electron transfer behavior between adsorbed CO or H2 and the crystal surface varied, which further affected the photocatalytic behavior. The results show that the effect of photothermal synergy may not only produce the expected kinetic energy, but more importantly, produce energy that can change the activation mode of the reactant gas. This study provides a new understanding of the CO catalytic oxidation and reduction processes over semiconductor materials.

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Section: Introductionmentioning

confidence: 99%

Thermo-driven photocatalytic CO reduction and H2 oxidation over ZnO via regulation of reactant gas adsorption electron transfer behavior

Wang

et al. 2021

Chinese Journal of Catalysis

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“…Moreover, an addition of a new support to a single support can increase the activity of the supported catalyst. Huang et al [29] compared Pt catalysts supported on TiO 2 and CeO 2 -TiO 2 for the NO reduction by CO with ultraviolet light irradiation. The doped CeO 2 can strengthen the electron transfer from TiO 2 to Pt through a process of Ce 4+ →Ce 3+ under UV irradiation, resulting in the adsorption and activation of CO and NO species at Pt/CeO 2 -TiO 2 .…”

Section: Precious Metal Catalystmentioning

confidence: 99%

State-of-Art Review of NO Reduction Technologies by CO, CH4 and H2

et al. 2021

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Removal of nitrogen oxides during coal combustion is a subject of great concerns. The present study reviews the state-of-art catalysts for NO reduction by CO, CH4, and H2. In terms of NO reduction by CO and CH4, it focuses on the preparation methodologies and catalytic properties of noble metal catalysts and non-noble metal catalysts. In the technology of NO removal by H2, the NO removal performance of the noble metal catalyst is mainly discussed from the traditional carrier and the new carrier, such as Al2O3, ZSM-5, OMS-2, MOFs, perovskite oxide, etc. By adopting new preparation methodologies and introducing the secondary metal component, the catalysts supported by a traditional carrier could achieve a much higher activity. New carrier for catalyst design seems a promising aspect for improving the catalyst performance, i.e., catalytic activity and stability, in future. Moreover, mechanisms of catalytic NO reduction by these three agents are discussed in-depth. Through the critical review, it is found that the adsorption of NOx and the decomposition of NO are key steps in NO removal by CO, and the activation of the C-H bond in CH4 and H-H bonds in H2 serves as a rate determining step of the reaction of NO removal by CH4 and H2, respectively.

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“…The platinum group metals (PGMs) have been widely studied for their excellent catalytic performance. However, the further application of PGM catalysts is greatly limited by the scarce resources, high price, and high temperature instability. − Accordingly, it is imperative to develop green catalysts with high performance, low cost, and stability.…”

Section: Introductionmentioning

confidence: 99%

Peanut-Shaped Cu–Mn Nano-Hollow Spinel with Oxygen Vacancies as Catalysts for Low-Temperature NO Reduction by CO

Qin

Fan

et al. 2021

ACS Appl. Nano Mater.

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Manganese−copper spinel is a kind of efficient catalyst for NO reduction by CO; however, its unsatisfactory lowtemperature catalytic performance and poor N 2 selectivity limit its application. Here, peanut-shaped Cu 0.75 Mn 2.25 O 4 nano-hollow spinel (Cu 0.75 Mn 2.25 O 4 -NH) was prepared by a one-pot solvothermal method and applied in NO reduction by CO. The structure and physicochemical properties of catalysts were researched by comprehensive characterizations. Compared with Cu 0 . 7 5 Mn 2 . 2 5 O 4 nanoparticles (Cu 0 . 7 5 Mn 2 . 2 5 O 4 -NP), Cu 0.75 Mn 2.25 O 4 -NH displayed excellent low-temperature catalytic performance, achieving 90% NO conversion at 200 °C, and possessed a lower apparent activation energy (36.4 kJ•mol −1 ). Importantly, the unique nanostructure with more exposed active sites enhanced the redox properties and oxygen mobility of the Cu 0.75 Mn 2.25 O 4 -NH catalyst. In addition, a synergistic effect between different metal ions in the Cu 0.75 Mn 2.25 O 4 -NH catalyst promoted the formation of oxygen vacancies and more low-oxidation-state species, which were conducive to the N−O bond scission at low temperatures. Combining the in situ DRIFTS results and DFT calculations, the dispersed species of Cu y+ -O-Mn x+ could be reduced to the main reactive species of Cu (y−1)+ -□-Mn (x−1)+ . Moreover, the formation of oxygen vacancies optimized NO adsorption and activation ability, which improved the catalytic performance in NO reduction by CO.

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Promotion effect of ultraviolet light on NO + CO reaction over Pt/TiO2 and Pt/CeO2–TiO2 catalysts

Cited by 69 publications

References 51 publications

Thermo-driven photocatalytic CO reduction and H2 oxidation over ZnO via regulation of reactant gas adsorption electron transfer behavior

Thermo-driven photocatalytic CO reduction and H2 oxidation over ZnO via regulation of reactant gas adsorption electron transfer behavior

State-of-Art Review of NO Reduction Technologies by CO, CH4 and H2

Peanut-Shaped Cu–Mn Nano-Hollow Spinel with Oxygen Vacancies as Catalysts for Low-Temperature NO Reduction by CO

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