Photo-induced strong active component-support interaction enhancing NOx removal performance of CeO2/TiO2

Wang, Song; Zeng, Yiqing; Wang, Yanan; Zhang, Shule; Zhong, Qin; Wang, Tianxiao; Wang, Xuemin

doi:10.1016/j.apsusc.2019.01.190

Cited by 20 publications

(7 citation statements)

References 42 publications

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“…found that similar enhancement can be obtained by treating Ce−Ti sample with desired aqueous hydrochloric acid solution [97] . Since CeO 2 −TiO 2 sample is also a good photocatalyst, thus we have adopted a photo‐treatment to enhance its NH 3 −SCR activity [21b,98] . For CeO 2 /TiO 2 catalyst, photo‐treatment can induce a stronger interaction between CeO 2 and TiO 2 and the formation of new oxygen vacancies and Ce 3+ ions [21b] .…”

Section: Methods In Improving the Catalytic Activity Of Ceo2−tio2 Catmentioning

confidence: 61%

“…Since CeO 2 −TiO 2 sample is also a good photocatalyst, thus we have adopted a photo‐treatment to enhance its NH 3 −SCR activity [21b,98] . For CeO 2 /TiO 2 catalyst, photo‐treatment can induce a stronger interaction between CeO 2 and TiO 2 and the formation of new oxygen vacancies and Ce 3+ ions [21b] . These improvements enhance the redox properties and surface acidity of CeO 2 /TiO 2 catalyst, which leads to superior NH 3 −SCR activity of photo‐treated CeO 2 /TiO 2 catalyst.…”

Section: Methods In Improving the Catalytic Activity Of Ceo2−tio2 Catmentioning

confidence: 99%

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Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

et al. 2020

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Selective catalytic reduction of NOx with NH3 (NH3−SCR) is one of the widely used process to abate NOx emission from both stationary and mobile sources. Recently, CeO2−TiO2 based NH3−SCR catalysts due to their excellent medium and high temperature activities, high N2 selectivity and environmentally friendly, have attracted much attention as great candidate to replace the commercial VOx−TiO2 based NH3−SCR catalysts. During the past years, extensive works have been done to achieve the industrial commercialization of CeO2−TiO2 based NH3−SCR catalyst. In this review, we summarize the recent studies on the mechanism, deactivation, preparation and modification of CeO2−TiO2 catalyst. The focus of this review is the modification strategies on improving the catalytic performance of CeO2−TiO2 catalyst. By comparing the effect of different modification strategies on the catalytic performance of CeO2−TiO2 catalyst, the perspectives and challenges of CeO2−TiO2 based catalyst for NH3−SCR of NOx are discussed.

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Section: Methods In Improving the Catalytic Activity Of Ceo2−tio2 Catmentioning

confidence: 61%

Section: Methods In Improving the Catalytic Activity Of Ceo2−tio2 Catmentioning

confidence: 99%

Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

et al. 2020

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“…For supported catalysts, the catalytic performance of active components depends mainly on interfacial active componentsupport interaction (ACSI). [104][105][106][107] When loading the active components (e.g., metal, metal oxide) on supports (e.g., metal oxide, carbon), strong interfacial electronic perturbation commonly occurs, resulting in charge distribution and creation of electron-rich/-deficient sites on the active components and supports. Accordingly, this modulation influences the stabilization and dispersion of active components on the support and chemisorption of reactants, intermediates, and products, thus enabling significant regulation of the activation barriers for the overall reaction pathway.…”

Section: Interfacial Interactionmentioning

confidence: 99%

Carbon Catalysts for Electrochemical CO₂ Reduction toward Multicarbon Products

Pan

Yang

O'Carroll

et al. 2022

Advanced Energy Materials

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chemicals has been emerging as one of the most attractive routes by the aqueous medium system and convenient operation under ambient conditions. [1,2] Moreover, CO 2 electrolysis can be powered by renewable energy-derived electricity, offering a viable route to store intermittent renewable energy into transportable fuels.CO 2 reduction reaction (CO 2 RR) at the cathode is the critical process in CO 2 electrolysis (Figure 1A), which takes place at a complex solid/liquid/gas triple-phase interface (Figure 1B). [3] Solid-state electrocatalysts are at the heart of CO 2 electrolysis technology, determining activity, selectivity, stability, and energy conversion efficiency. Theoretically, CO 2 RR can produce a broad distribution of products ranging from C 1 (e.g., CO, HCOOH) to C 2 (e.g., C 2 H 4 , CH 3 COOH, C 2 H 5 OH) and C 3 (e.g., CH 3 COCH 3 , C 3 H 7 OH) (Figure 1C). [4] To meet the criteria for practical implementation, techno-economic analyses suggest that CO 2 electrolysis should produce a single product with a Faradaic efficiency (FE) > 90%, a partial current density (J p ) > 200 mA cm −2 , an energy conversion efficiency (EE) > 60%, and operation stability of more than 1000 h. [1,5,6] Figure 1D summarizes the current benchmarking performance for typical products. Obviously, the reduction of CO 2 to CO on commercial silver nanoparticles [7] and HCOOH on defective bismuth oxide nanotubes [8] are close to industrial thresholds and under pilot-scale test, [2] despite the short operation time for HCOOH provided in the literature.Compared to C 1 , reducing CO 2 to C 2+ hydrocarbons and oxygenates is more desirable because of their higher energy density, larger market size, and bigger contribution to decreasing net CO 2 emission. [1] However, the current CO 2 -to-C 2+ system remains far from meeting the thresholds necessary for practical application, especially with regard to FE, EE, and stability (Figure 1D). For example, the state-of-the-art CO 2 -to-C 2 H 4 reduction displays an FE of 80% and a J p of 400 mA cm −2 for 100 h on copper-aluminum alloy in a gas diffusion electrode (GDE)-based flow cell electrolyzer using 1 m KOH electrolyte, [9] or longer durability (150 h) yet a lower FE (70%) and J p (100 mA cm −2 ) on metallic copper in a flow cell with 7 m KOH electrolyte. [10] The best CO 2 -to-C 2 H 5 OH catalyst presents an FE of 52%, a J p of 160 mA cm −2 , and a EE of 16% for 16 h on carbon-coated copper fiber in a GDE-based membrane electrode assembly (MEA) fuel cell electrolyzer using humidified Electrochemical CO 2 reduction offers a compelling route to mitigate atmospheric CO 2 concentration and store intermittent renewable energy in chemical bonds. Beyond C 1 , C 2+ feedstocks are more desirable due to their higher energy density and more significant market need. However, the CO 2 -to-C 2+ reduction suffers from significant barriers of CC coupling and complex reaction pathways. Due to remarkable tunability over morphology/pore architecture along with great feasibility of functionalization to modify t...

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“…Atmospheric pollution caused by nitrogen oxides (NOx) has been identified as one of the most severe environmental problems (Song et al, 2019;Yang et al, 2019). Usually, NOx refers to NO and NO2, the two most common atmospheric nitrogen oxides.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis and characterization of anatase TiO2/g-CN composites for enhanced photoactivity under UV–visible spectrum

et al. 2021

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For the purpose of atmospheric NO removal, anatase TiO2/g-CN photocatalytic composites were prepared by using a facile template-free calcination route in atmospheric conditions. Considerably fiscal NP400 and laboratory-grade melamine were used as the precursor of the composites. Additionally, samples were prepared with different wt. ratios of TiO2 and melamine by using two distinct calcination temperatures (550°C/600°C). The morphological attributes of the composites were assessed with X-ray diffraction, scanning and transmission electron microscopy, infrared spectroscopy, and X-ray photoelectron spectroscopy. Additionally, the optical traits were evaluated and compared using UVvisible diffuse reflectance spectroscopy and photoluminescence analysis. Finally, the photodegradation potentials for atmospheric NO by using the as-prepared composites were assessed under both UV and visible light irradiation. All the composites showed superior NO oxidation compared to NP400 and bulk g-CN. For the composites prepared by using the calcination temperature of 550°C, the maximum NO removal was observed when the NP400 to melamine ratio was 1:2, irrespective of the utilized light irradiation type. Whereas for increased calcination temperature (600°C), the maximum NO removal was observed at the precursor mix ratio of 1:3 (NP400:melamine). Successfully narrowed energy bandgaps were perceived in the as-prepared composites. Moreover, a subsequent drop in NO2 generation during NO oxidation was observed under both UV and visible light irradiation. Interestingly, higher calcination temperature during the synthesis of the catalysts has shown a significant drop in NO2 generation during the photodegradation of NO.

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Photo-induced strong active component-support interaction enhancing NOx removal performance of CeO2/TiO2

Cited by 20 publications

References 42 publications

Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

Carbon Catalysts for Electrochemical CO₂ Reduction toward Multicarbon Products

Facile synthesis and characterization of anatase TiO2/g-CN composites for enhanced photoactivity under UV–visible spectrum

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Photo-induced strong active component-support interaction enhancing NOx removal performance of CeO2/TiO2

Cited by 20 publications

References 42 publications

Recent Progress of CeO2−TiO2 Based Catalysts for Selective Catalytic Reduction of NOx by NH3

Recent Progress of CeO2−TiO2 Based Catalysts for Selective Catalytic Reduction of NOx by NH3

Carbon Catalysts for Electrochemical CO2 Reduction toward Multicarbon Products

Facile synthesis and characterization of anatase TiO2/g-CN composites for enhanced photoactivity under UV–visible spectrum

Contact Info

Product

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Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

Carbon Catalysts for Electrochemical CO₂ Reduction toward Multicarbon Products