Low-temperature selective catalytic reduction of NOx with NH3 over zeolite catalysts: A review

Pu, Yijuan; Xie, Xinyu; Jiang, Wenju; Yang, Lin; Jiang, Xia; Lu, Yong

doi:10.1016/j.cclet.2020.04.012

Cited by 60 publications

(43 citation statements)

References 105 publications

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“…) [4] . 一般认为NH (ads), 主要发生在低温SCR反应中 [5] . 实际上, 不同温区 NH 3 的反应情况较为复杂, V 2 O 5 -WO 3 /TiO 2 催化剂, 高温下依然是Lewis酸为主要活性酸位点 [6] .…”

Section: 评述unclassified

Research progress in the SO2 resistance of denitration catalysts in low-temperature NH3-SCR reactions

Liu¹,

He²,

Mao³

et al. 2022

Sci. Sin.-Chim

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NH 3 -SCR reaction is one of the most widely used denitration technologies at present, and the catalyst is the core of the NH 3 -SCR technology. Because of its low-temperature activity and easy deactivation in the presence of SO 2 , the research on the low-temperature sulfur-resistance of denitration catalysts becomes a hot spot. In this review, the deactivation mechanism of NH 3 -SCR catalysts in the presence of SO 2 is reviewed. It is found that the deactivation of the catalysts is mainly due to the reaction of SO 2 with NH 3 and metal-active sites; the formation of ammonium sulfates or ammonium bisulfates will block the pores of the catalysts and affect the efficiency of the catalysts; the metal sulfates will lead to the deactivation of the active sites of the catalysts and cause the irreversible deactivation of the catalysts; the competitive adsorption of SO 2 and NO will also cause the deactivation of the catalysts. Based on the known mechanism of catalyst deactivation, some effective strategies for improving the SO 2 tolerance are proposed: reducing the adsorption and oxidation of SO 2 , constructing sacrificial sites to protect active sites and promoting the decomposition of sulfates. It is found that the sulfur resistance of the catalysts can be improved by some methods: such as metal modification, the special structure of catalysts, the influence of supports, acid catalysts. Finally, the development prospect of lowtemperature sulfur-resistant NH 3 -SCR denitration catalysts is prospected.

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Section: 评述unclassified

Research progress in the SO2 resistance of denitration catalysts in low-temperature NH3-SCR reactions

Liu¹,

He²,

Mao³

et al. 2022

Sci. Sin.-Chim

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“…Zeolites, crystalline aluminosilicates, manifested excellent ion exchange properties and abundant surface acidity owing to the replacement of Si ions with an Al ion. Contemporarily, miscellaneous structures of zeolite have been authenticated, which could be discriminated through the maximum aperture of the frame structure opening, for instance, weeny (8-membered ring), middling (10-membered ring), and enormous and king-sized (12-membered ring or above), respectively . As a carrier, it is noteworthy that zeolites have superior adsorption performances and flexibility of complicated operating environments. , …”

Section: Catalystsmentioning

confidence: 99%

“…Contemporarily, miscellaneous structures of zeolite have been authenticated, 149 which could be discriminated through the maximum aperture of the frame structure opening, for instance, weeny (8-membered ring), middling (10-membered ring), and enormous and king-sized (12-membered ring or above), respectively. 150 As a carrier, it is noteworthy that zeolites have superior adsorption performances and flexibility of complicated operating environments. 151,152 However, compared with conventional middling and enormous pore zeolites, the weeny pore zeolites have substantial distinguishing superiority: wider temperature window, outstanding thermal stability, and exceptionally brilliant SO 2 resistance performance.…”

Section: Improving the Resistance To Alkali Metals Whenmentioning

confidence: 99%

Cerium Oxide-Based Catalysts for Low-Temperature Selective Catalytic Reduction of NO_x with NH₃: A Review

et al. 2021

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The selective catalytic reduction (SCR) of NO x with ammonia is an effective method to remove NO x from stationary and mobile sources. Cerium oxides (CeO x ) have been studied extensively as low-temperature SCR catalysts since they manifest prominent oxygen storage capacity in catalysis. This paper reviews the recent progress on the Ce-based catalysts for low-temperature SCR de-NO x with NH 3 , including three categories, single CeO x , Ce-based multimetal oxide, and Ce-based multimetal oxides with support. In the section on single CeO x , the reasons for the significant catalytic activity and the function of CeO x in the catalytic reactions are systematically reviewed. For multimetal oxide catalysts, the various roles played by the components of catalysts are summarized from several aspects. In the introduction of supported metal oxide catalysts, according to the type of support, the function of each support in the reaction is analyzed methodically. Additionally, we investigated the reaction mechanism of lowtemperature SCR of NO x , including Eley−Rideal (E−R) and Langmuir−Hinshelwood (L−H) mechanisms. Finally, the development outlook and direction of the application of cerium oxide-based catalysts in the field of low-temperature SCR of NO x is prospected.

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“…Most of these methods involve technologies for eliminating NO x after its generation owing to many obstacles. The adsorption method is suitable only for the removal of a high concentration of NO x in the combustion exhaust gas, has a high purification efficiency, and does not produce additional liquid wastes; however, it has a high operating cost [17]. Furthermore, NSCR or SCR technologies, in general, are limited to the treatment of high concentrations of NO x [12,18], and their efficiency and economic benefits reduce for lower NO x concentration.…”

Section: Introductionmentioning

confidence: 99%

Research Progress on Photocatalytic/Photoelectrocatalytic Oxidation of Nitrogen Oxides

Chen

et al. 2021

Trans. Tianjin Univ.

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The emission of nitrogen oxides (NOx) increases year by year, causing serious problems to our livelihoods. The photocatalytic oxidation of NOx has attracted more attention recently because of its efficient removal of NOx, especially for low concentrations of NOx. In this review, the mechanism of the photocatalytic oxidation of NOx is described. Then, the recent progress on the development of photocatalysts is reviewed according to the categories of inorganic semiconductors, bismuth-based compounds, nitrogen carbide polymer, and metal organic frameworks (MOFs). In addition, the photoelectrocatalytic oxidation of NOx, a method involving the application of an external voltage on the photocatalytic system to further increase the removal efficiency of NOx, and its progress are summarized. Finally, we outline the remaining challenges and provide our perspectives on the future directions for the photocatalytic oxidation of NOx.

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Low-temperature selective catalytic reduction of NOx with NH3 over zeolite catalysts: A review

Cited by 60 publications

References 105 publications

Research progress in the SO<sub>2</sub> resistance of denitration catalysts in low-temperature NH<sub>3</sub>-SCR reactions

Research progress in the SO<sub>2</sub> resistance of denitration catalysts in low-temperature NH<sub>3</sub>-SCR reactions

Cerium Oxide-Based Catalysts for Low-Temperature Selective Catalytic Reduction of NO_x with NH₃: A Review

Research Progress on Photocatalytic/Photoelectrocatalytic Oxidation of Nitrogen Oxides

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Low-temperature selective catalytic reduction of NOx with NH3 over zeolite catalysts: A review

Cited by 60 publications

References 105 publications

Research progress in the SO&lt;sub&gt;2&lt;/sub&gt; resistance of denitration catalysts in low-temperature NH&lt;sub&gt;3&lt;/sub&gt;-SCR reactions

Research progress in the SO&lt;sub&gt;2&lt;/sub&gt; resistance of denitration catalysts in low-temperature NH&lt;sub&gt;3&lt;/sub&gt;-SCR reactions

Cerium Oxide-Based Catalysts for Low-Temperature Selective Catalytic Reduction of NOx with NH3: A Review

Research Progress on Photocatalytic/Photoelectrocatalytic Oxidation of Nitrogen Oxides

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Research progress in the SO<sub>2</sub> resistance of denitration catalysts in low-temperature NH<sub>3</sub>-SCR reactions

Research progress in the SO<sub>2</sub> resistance of denitration catalysts in low-temperature NH<sub>3</sub>-SCR reactions

Cerium Oxide-Based Catalysts for Low-Temperature Selective Catalytic Reduction of NO_x with NH₃: A Review