Application of ReOx/TiO2 catalysts with excellent SO2 tolerance for the selective catalytic reduction of NOx by NH3

Yu, Yanke; Yi, Xianfang; Zhang, Jiali; Tong, Zhaojian; Chen, Changwei; Ma, Mudi; He, Chi; Wang, Jinxiu; Chen, Jinsheng; Chen, Bingbing

doi:10.1039/d1cy00467k

Cited by 68 publications

(27 citation statements)

References 52 publications

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“…5C, the O 1s peaks could be fitted into three peaks referred to the lattice oxygen species at 530.0 ± 0.1 eV (denoted O α ), the surface OH group at 531.5 ± 0.1 eV (denoted O β ) and the weakly adsorbed oxygen at 532.9 ± 0.1 eV (denoted O γ ). 28,29 It is universally acknowledged that surface chemisorbed oxygen (O β + O γ ) is much more reactive in SCR reactions than lattice oxygen species (O α ). The surface chemisorbed oxygen species can effectively oxidize NO to NO 2 , thus improving the catalytic activity via a “fast NH 3 -SCR” route.…”

Section: Resultsmentioning

confidence: 99%

Promotional effect of Fe and Ce co-doping on a V₂O₅–WO₃/TiO₂ catalyst for SCR of NO_x with high K and Pb resistance

Wang

Liu

et al. 2022

Catal. Sci. Technol.

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Section: Resultsmentioning

confidence: 99%

Promotional effect of Fe and Ce co-doping on a V₂O₅–WO₃/TiO₂ catalyst for SCR of NO_x with high K and Pb resistance

Wang

Liu

et al. 2022

Catal. Sci. Technol.

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“…6(c) deconvoluted into two major peaks with binding energies of approximately 530.1 eV and 532.5 eV, mainly associated with the lattice oxygen (O latt ) species and the surface chemisorbed oxygen (O ads ) species ( e.g. , O 2 2− , O 2− , O − or OH − ), 35–41 respectively. According to previous studies, 21,36–39 the number of oxygen vacancies can be proportionally reflected by the relative peak intensity of O ads .…”

Section: Resultsmentioning

confidence: 99%

Highly improved acetone oxidation performance over mesostructured Cu_xCe_1−xO₂ hollow nanospheres

et al. 2022

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“…Vanadium-based materials which was active in the temperature range from 300 to 400 °C and exhibited high stability in the presence of SO2, have been the main commercial SCR catalysts and are widely used around the world 5,6 . However, due to the high bio-toxicity of vanadium and facile oxidation of SO2 to SO3, a lot of vanadium-free SCR catalysts have been researched 7,8 . Metal oxides catalysts (MnOx, FeOx, etc.)…”

Section: Introductionmentioning

confidence: 99%

Effect of Potassium on the Performance of a CuSO4/TiO2 Catalyst Used in the Selective Catalytic Reduction of NOx by NH3

Yu¹,

Geng²,

Wei³

et al. 2022

Acta Physico Chimica Sinica

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Owing to its renewability, abundance, and low environmental impact, biomass is considered to be a viable eco-friendly fuel. Various biofuelfired power plants have been built worldwide to reduce carbon emissions. Potassium (K) is a typical impurity in the flue gas from biofuel combustion that can deactivate the catalyst used in the selective catalytic reduction of NOx by ammonia (NH3-SCR). CuSO4/TiO2, with excellent sulfur dioxide tolerance, is thought to be a promising vanadium-free catalyst for NH3-SCR; however, the influence of K on the CuSO4/TiO2 catalyst is still unknown. Therefore, in this study, the effect of K on the NH3-SCR performance of CuSO4/TiO2 were investigated and compared with the effect on the performance of the commercial V2O5-WO3/TiO2 (VWTi) catalyst. K-poisoned catalysts were prepared via wet impregnation using potassium acetate as the K source. Nitrogen (N2) adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), NH3-temperature programmed desorption (NH3-TPD), H2temperature programmed reduction (H2-TPR), and in situ diffuse reflectance infrared Fourier-transform spectroscopy (in situ DRIFTS) were used to characterize the prepared catalysts. The NOx conversion over CuSO4/TiO2 with 1.0% (w) K was 92.1% (at 350 °C), which was higher than the conversion (75.1%) achieved over the commercial VWTi catalyst with the same K content. The XRD, XPS, and H2-TPR results suggested that K reacted with the CuSO4 in the CuSO4/TiO2 catalyst to form CuO and K2SO4. The presence of CuO enhanced the oxidation of NH3 to N2O, NO, and NO2 during NH3-SCR, thereby decreasing the NOx conversion and N2 selectivity over CuSO4/TiO2. Moreover, based on the results from NH3-TPD and in situ DRIFTS of NH3 adsorption, it can be concluded that the Brønsted acid sites (S-OH) were poisoned by K, which restrained the adsorption of NH3 on CuSO4/TiO2. Additionally, the high K content altered the pore structure of the catalyst, leading to a decrease in the specific surface area. However, according to the in situ DRIFTS results, NH3-SCR over K-poisoned CuSO4/TiO2 still followed the Eley-Rideal mechanism: First, NH3 was adsorbed on the Lewis and Brønsted acid sites of the catalyst, and then gaseous NO and O2 reacted with the adsorbed NH3/NH4+ on the acid sites, resulting in the formation of N2 and H2O. Notably, the abundance of acid sites and surface-adsorbed oxygen species on CuSO4/TiO2 could be the main reason for its higher resistance to K-poisoning. In conclusion, our current findings suggested that CuSO4/TiO2 might be a suitable NH3-SCR catalyst for use in the flue gas streams from biofuel-fired power plants.

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Application of ReO_x/TiO₂ catalysts with excellent SO₂ tolerance for the selective catalytic reduction of NO_x by NH₃

Abstract: Non-vanadium-based catalysts with high SO2 tolerance are still challenging to date in selective catalytic reduction of NO by NH3 (NH3-SCR) and SO2 adsorption is the foremost step for the deactivation...

Cited by 68 publications

References 52 publications

Promotional effect of Fe and Ce co-doping on a V₂O₅–WO₃/TiO₂ catalyst for SCR of NO_x with high K and Pb resistance

Promotional effect of Fe and Ce co-doping on a V₂O₅–WO₃/TiO₂ catalyst for SCR of NO_x with high K and Pb resistance

Highly improved acetone oxidation performance over mesostructured Cu_xCe_1−xO₂ hollow nanospheres

Effect of Potassium on the Performance of a CuSO<sub>4</sub>/TiO<sub>2</sub> Catalyst Used in the Selective Catalytic Reduction of NO<sub><i>x</i></sub> by NH<sub>3</sub>

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Application of ReOx/TiO2 catalysts with excellent SO2 tolerance for the selective catalytic reduction of NOx by NH3

Abstract: Non-vanadium-based catalysts with high SO2 tolerance are still challenging to date in selective catalytic reduction of NO by NH3 (NH3-SCR) and SO2 adsorption is the foremost step for the deactivation...

Cited by 68 publications

References 52 publications

Promotional effect of Fe and Ce co-doping on a V2O5–WO3/TiO2 catalyst for SCR of NOx with high K and Pb resistance

Promotional effect of Fe and Ce co-doping on a V2O5–WO3/TiO2 catalyst for SCR of NOx with high K and Pb resistance

Highly improved acetone oxidation performance over mesostructured CuxCe1−xO2 hollow nanospheres

Effect of Potassium on the Performance of a CuSO<sub>4</sub>/TiO<sub>2</sub> Catalyst Used in the Selective Catalytic Reduction of NO<sub><i>x</i></sub> by NH<sub>3</sub>

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Application of ReO_x/TiO₂ catalysts with excellent SO₂ tolerance for the selective catalytic reduction of NO_x by NH₃

Promotional effect of Fe and Ce co-doping on a V₂O₅–WO₃/TiO₂ catalyst for SCR of NO_x with high K and Pb resistance

Promotional effect of Fe and Ce co-doping on a V₂O₅–WO₃/TiO₂ catalyst for SCR of NO_x with high K and Pb resistance

Highly improved acetone oxidation performance over mesostructured Cu_xCe_1−xO₂ hollow nanospheres