Fe–Ti spinel for the selective catalytic reduction of NO with NH3: Mechanism and structure–activity relationship

Yang, Shijian; Li, Junhua; Wang, Chizhong; Chen, Jinghuan; Ma, Lei; Chang, Huazhen; Chen, Liang; Peng, Yue; Yan, Naiqiang

doi:10.1016/j.apcatb.2012.01.001

Cited by 179 publications

(127 citation statements)

References 29 publications

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“…Various catalysts have been reported to be effective for NH 3 /urea-SCR, including vanadium-based catalysts [5], Fe-, Cu-, Ce-exchanged zeolite materials [4,[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], and various vanadium-free oxide catalysts [22][23][24][25][26][27][28]. The toxicity of active vanadium species, together with the low stability at high temperatures, has restrained the wide application of vanadium-based catalysts, while the activities of vanadiumfree oxide catalysts are often insufficient and mainly tested using simulating gas in laboratory.…”

Section: Introductionmentioning

confidence: 99%

High-efficiency reduction of NO emission from diesel exhaust using a CeWO catalyst

Shan

Liu

et al. 2015

Catalysis Communications

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Section: Introductionmentioning

confidence: 99%

High-efficiency reduction of NO emission from diesel exhaust using a CeWO catalyst

Shan

Liu

et al. 2015

Catalysis Communications

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“…To date, the effect of O 2 on SCR of NO x over spinel catalyst has been addressed in Refs. [8,14,15]. Yang et al [8] have reported that Fe +3 oxidizes NO to NO 2 under excess oxygen and Fe +3 is obtained by reaction of Fe +2 oxidation.…”

Section: Introductionmentioning

confidence: 98%

“…[8,14,15]. Yang et al [8] have reported that Fe +3 oxidizes NO to NO 2 under excess oxygen and Fe +3 is obtained by reaction of Fe +2 oxidation. Okimura et al [14] have reported that oxygen only oxidizes NO to NO 2 and does not activate CH 4 .…”

Section: Introductionmentioning

confidence: 98%

“…For instance, NO x is responsible for greenhouse effect with high global warming potential [2], contributes to formation of acid rains [3], and can deplete the ozone layer even if destruction of a small percentage of ozone may noticeably increase the UV radiation level [4]. To effectively remove this harmful substance, much effort is currently devoted to reducing NO x in excess oxygen over spinel-oxide catalysts [5][6][7][8][9][10][11]. Laboratory and pilot scale synthesis, characterization and reactivity of multicomponent cobalt spinel catalyst for low temperature removal of N 2 O from nitric acid plant tail gases has been revealed [5].…”

Section: Introductionmentioning

confidence: 99%

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Effect of O2 on reduction of NO2 with CH4 over gallium-modified ZnAl2O4 spinel-oxide catalyst by first principle analysis

Xiang

Tan

et al. 2015

Applied Surface Science

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“…In power plants, the commercial catalysts (V 2 O 5 -WO 3 (MoO 3 )/TiO 2 ), with relatively narrow temperature window of 300-400°C, have been widely used. However, due to the drawbacks of these catalysts, such as high catalytic temperature, narrow temperature window and toxicity of vanadium by SO 2 or dust, there has been a continuing effort to develop a highly low-temperature (≤ 250°C) efficient, stable, environmentalfriendly SCR catalysts for the removal of NO x (Lou et al, 2003Jiang et al, 2009;Yang et al, 2012;Liu et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

In Situ DRIFTS Study of the Low Temperature Selective Catalytic Reduction of NO with NH3 over MnOx Supported on Multi-Walled Carbon Nanotubes Catalysts

Wang

Huang

2015

Aerosol Air Qual. Res.

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MnO x supported on multi-walled carbon nanotubes (MWCNTs) catalysts were prepared by the pore volume impregnation method and used for low-temperature selective catalytic reduction (SCR) of NO with NH 3 . Based on the previous study, 10 wt.% loading MnO x /MWCNTs were then selected for investigation of the reaction mechanism by in situ Diffuse Reflectance Infrared Fourier Transform spectroscopy (in-situ DRIFTS). The important intermediates in the SCR of NO x process at 210°C were discussed based on the DRIFTS results. Furthermore, the NH 3 -SCR reaction pathways over MnO x /MWCNTs catalysts were proposed. The results showed that NH 4 + species on Brønsted acid sites and coordinate ammonia species on Lewis acid sites existed during the SCR reaction. NH 4 + species was more active than coordinate ammonia species over the catalysts at 210°C. Most of NO x ad-species would react with NH 3 ad-species. However, nitrite species, bidentate and monodentate nitrates contributed to the SCR reaction over the catalysts mostly. Two possible reaction pathways were proposed. One was that NO x ad-species could react with NH 4 + to form intermediate of NH 4 N 2 O 4 (a), NH 4 NO 2 (a) or NH 4 NO 3 (a), then to produce N 2 and H 2 O as the final products. The other pathway was that NH 3 was initially adsorbed on active site and NH 2 was formed, then NH 2 reacted with NO x ad-species to produce intermediate NH 2 NO 2 or NH 2 NO 3 which were unstable and would decompose into N 2 and H 2 O.

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Fe–Ti spinel for the selective catalytic reduction of NO with NH3: Mechanism and structure–activity relationship

Cited by 179 publications

References 29 publications

High-efficiency reduction of NO emission from diesel exhaust using a CeWO catalyst

High-efficiency reduction of NO emission from diesel exhaust using a CeWO catalyst

Effect of O2 on reduction of NO2 with CH4 over gallium-modified ZnAl2O4 spinel-oxide catalyst by first principle analysis

In Situ DRIFTS Study of the Low Temperature Selective Catalytic Reduction of NO with NH3 over MnOx Supported on Multi-Walled Carbon Nanotubes Catalysts

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