Remarkable low temperature catalytic activity for SCR of NO with propylene under oxygen-rich conditions over Mn0.2La0.07Ce0.05Ox/ZSM-5 catalyst

Xu, Junqiang; Tang, Tian; Zhang, Qiang; Zhang, Chuan; Guo, Fang

doi:10.1016/j.vacuum.2021.110174

Cited by 14 publications

(6 citation statements)

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“… 52 NCO was also a key active intermediate for Ag/Al 2 O 3 catalysts, 52 which was formed through the reaction between acetates and nitrates, and was easily further oxidized into CO 2 and N 2 . Xu et al 46 and Guo et al 12 also reported that NCO species played an important role in improving C 3 H 6 -SCR process. The band assigned to NCO did not appear under the pre-adsorption reaction conditions, indicating that the SCR reaction of the 1Sn5Ag/γ-Al 2 O 3 catalyst not only followed the E-R mechanism, but also followed the L-H mechanism.…”

Section: Resultsmentioning

confidence: 99%

“…Due to the abundant reserves and low price, transitional metal-based catalysts such as Cu, Sn, Fe, Co, and Mn have been widely studied for C 3 H 6 -SCR. [11][12][13][14][15][16][17][18][19] In addition, due to the strong oxidizing ability of precious metals and excellent NO x removal performance, Ag, Pt, Pd and other precious metals are also widely used in various industrial ue gases purication. 20,21 Among them, SnO 2 has been found to be rich in surface oxygen vacancies and acidic sites and showed great potential.…”

Section: Introductionmentioning

confidence: 99%

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Rationally tailored redox ability of Sn/γ-Al₂O₃ with Ag for enhancing the selective catalytic reduction of NO_x with propene

Zhang

et al. 2023

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rationally tailored redox ability of Sn/γ-Al₂O₃ with Ag for enhancing the selective catalytic reduction of NO_x with propene

Zhang

et al. 2023

RSC Adv.

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“…The selective catalytic reduction of NO x by hydrocarbons (HC-SCR) has been a research focus of environmental catalysis since the 1990s. − Among the available hydrocarbons, methane was regarded as a special beneficial reducing agent for its cheap cost and abundant resource . For catalysts in the hydrocarbon SCR, indium-containing zeolites, including ZSM-5, BEA, and MOR, have shown significant activity and resistance to water in the process.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Propane Adsorption and the Following NO_x Reduction over an In/BEA Catalyst: A Computational Study

et al. 2022

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To expand the knowledge on hydrocarbon selective catalytic reduction (SCR) and follow the research steps of methane-SCR and propane-SCR in our previous work, we studied the characteristics of propane adsorption on In/BEA zeolite, explored the NO and NO2 activation process on a propane adsorbed catalyst, and calculated the reaction enthalpy of two reaction pathways. Results showed that O site in the L-model (the [InO]+/BEA structure) was the main active site in the adsorption process, and any of the carbon atoms in the propane molecule could react with it, with a lower adsorption energy than methane (−3.20 vs −2.98 eV). Also, NO or NO2 could not be directly activated on the propane adsorbed catalyst, indicating that the process may be complicated. In addition, propane reduces the NO or NO2 molecule with two different pathways and the final products were less stable than those of methane (−5.6 vs −20 eV). These results could explain the fact that propane and methane had different reaction temperatures and would further deepen our understanding of the propane-SCR process.

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“…24 In some studies, noble metal, Ag, 25 Pt, 26 and Au 27 were mixed with transitional metal oxides to improve catalyst activity, which provides excellent activity and stability. Furthermore, rare earth elements, Ce, 28 Ru, 29 La, 30 and etc., doping on zeolites, activated carbon or trans-metal oxides can greatly increase catalyst activity in a small amount.…”

Section: Introductionmentioning

confidence: 99%

An effective selective catalytic reduction catalyst contains oxygen bridge for NO _x reduction based on low concentration of C ₃ H ₆ at medium‐low temperatures

Liu

et al. 2022

Intl J of Energy Research

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Ammonia slip in NH 3 -SCR will lead to the formation of viscous salt, which may block the downward heat exchangers, which is particularly serious in oil refinery stations. Oil refinery stations are usually rich in low concentration propane (C 3 H 6 ), and C 3 H 6 -SCR is considered to be a very promising NO x emission reduction technology. This study reported an effective NO x reduction catalyst based on low concentration C 3 H 6 at medium-low temperature. CeO 2 was used to optimize the catalyst, but instead of doping CeO 2 to active component, and it was found that doping CeO 2 on TiO 2 to produce Ce-Ti synthetic support was effective. This study elucidates that in refinery tail gas environment, a 5 wt.% Mn loaded on Ce-Ti support catalyst (Mn 5 -Ce/TiO 2 ) can achieve 70% NO conversion, meanwhile the N 2 selectivity is 100%. In order to explore the mechanism of activity enhancement, the catalysts were characterized before and after reaction. The results indicate that the addition of CeO 2 provided more acid sites for the adsorption of propene, and the structure and properties of Mn 5 -Ce/TiO 2 hardly changed after reaction, which helped to maintain high activity in de-NO x process. The oxidation of Ce 3+ to Ce 4+ , and the reduction of Mn 3+ to Mn 2+ promoted the reduction of NO, while the oxygen bridge Ce-O-Ti promoted the stability of the catalyst, so as to achieve a high conversion of NO.

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Remarkable low temperature catalytic activity for SCR of NO with propylene under oxygen-rich conditions over Mn0.2La0.07Ce0.05Ox/ZSM-5 catalyst

Cited by 14 publications

References 50 publications

Rationally tailored redox ability of Sn/γ-Al₂O₃ with Ag for enhancing the selective catalytic reduction of NO_x with propene

Rationally tailored redox ability of Sn/γ-Al₂O₃ with Ag for enhancing the selective catalytic reduction of NO_x with propene

Mechanism of Propane Adsorption and the Following NO_x Reduction over an In/BEA Catalyst: A Computational Study

An effective selective catalytic reduction catalyst contains oxygen bridge for NO _x reduction based on low concentration of C ₃ H ₆ at medium‐low temperatures

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Remarkable low temperature catalytic activity for SCR of NO with propylene under oxygen-rich conditions over Mn0.2La0.07Ce0.05Ox/ZSM-5 catalyst

Cited by 14 publications

References 50 publications

Rationally tailored redox ability of Sn/γ-Al2O3 with Ag for enhancing the selective catalytic reduction of NOx with propene

Rationally tailored redox ability of Sn/γ-Al2O3 with Ag for enhancing the selective catalytic reduction of NOx with propene

Mechanism of Propane Adsorption and the Following NOx Reduction over an In/BEA Catalyst: A Computational Study

An effective selective catalytic reduction catalyst contains oxygen bridge for NO x reduction based on low concentration of C 3 H 6 at medium‐low temperatures

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Rationally tailored redox ability of Sn/γ-Al₂O₃ with Ag for enhancing the selective catalytic reduction of NO_x with propene

Rationally tailored redox ability of Sn/γ-Al₂O₃ with Ag for enhancing the selective catalytic reduction of NO_x with propene

Mechanism of Propane Adsorption and the Following NO_x Reduction over an In/BEA Catalyst: A Computational Study

An effective selective catalytic reduction catalyst contains oxygen bridge for NO _x reduction based on low concentration of C ₃ H ₆ at medium‐low temperatures