The influence of support composition on the activity of Cu:Ce catalysts for selective catalytic reduction of NO by CO in the presence of excess oxygen

Gholami, Zahra; Luo, Guohua; Gholami, Fatemeh

doi:10.1039/c9nj04335g

Cited by 20 publications

(4 citation statements)

References 65 publications

(78 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Cu1:Ce3/CNT catalyst displayed the highest NO conversion of 96% at 220 • C, attributed to its high concentration of surface oxygen vacancies (SOVs), high Cu + species content, superior reducing capability, and the synergistic effect between SOV and Cu + species. Furthermore, Gholami et al [39] investigated the denitration performance of a string of Cu1:Ce3 catalysts supported on various supports (CNTs, AC, TiO 2 , γ-Al 2 O 3 , and SiC) in the presence of excess O 2 (5 vol.%), and found that Cu1:Ce3/Al 2 O 3 catalyst possessed the highest catalytic performance, with 71.8% NO conversion at 420 • C, mainly ascribed to the enrichment of catalytically active centers of Cu on the Al 2 O 3 support. Interestingly, it was observed that with the increase in O 2 concentration from 2% to 5%, the conversion of NO increased slightly.…”

Section: Bimetallic Catalystsmentioning

confidence: 99%

“…Therefore, O 2 existing in the CO-SCR reaction system has an inhibitory effect on NO reduction. Gholami et al [39] investigated the effect of O 2 (2% or 5%) on the denitration performance of the Cu1:Ce3/Al 2 O 3 catalyst for the CO-SCR reaction system, and found that compared with the case without O 2 , the conversion of NO decreased from 59.3% to nearly 40% after 2% O 2 was introduced at 300 • C, but increased to 43.3% when 5% O 2 was introduced. They believe that this is because more O 2 is adsorbed on the surface of the catalyst and then cleaved to O (ad) , thereby promoting the formation of NO 2 , which can further rapidly react with CO to form N 2 and CO 2 .…”

Section: Effect Of Omentioning

confidence: 99%

See 1 more Smart Citation

Recent Advances of Cu-Based Catalysts for NO Reduction by CO under O2-Containing Conditions

Chen

Liu

et al. 2022

Catalysts

View full text Add to dashboard Cite

Selective catalytic reduction of NOxby CO (CO-SCR) to both N2 and CO2 is a promising way to simultaneously remove two harmful gases, CO and NOx, in automobile and factory exhaust gases. The development of efficient catalysts is the key challenge for the technology to be commercialized. The low-cost Cu-based catalysts have shown promising performance in CO-SCR, but there are some technical problems that obstruct their practical implementation, such as high reduction temperature and low O2, H2O, and SO2 resistance. This paper provides a comprehensive overview and insights into CO-SCR under O2-containing conditions over the Cu-based catalysts, including catalytic performances of non-supported, supported mono-metallic, supported bimetallic, and supported multi-metallic Cu-based catalysts. In addition, the effects of O2 concentration, reaction temperature, H2O, and SO2 on the catalytic performance are discussed. Furthermore, the reaction mechanism of CO-SCR on Cu-based catalysts is briefly summarized. Lastly, challenges and perspectives with respect to this reaction are discussed. We hope this work can provide theoretical guidance for the rational design of efficient Cu-based catalysts in the CO-SCR reaction for commercial applications.

show abstract

Section: Bimetallic Catalystsmentioning

confidence: 99%

Section: Effect Of Omentioning

confidence: 99%

Recent Advances of Cu-Based Catalysts for NO Reduction by CO under O2-Containing Conditions

Chen

Liu

et al. 2022

Catalysts

View full text Add to dashboard Cite

show abstract

“…However, it has been restricted due to its high cost and rare reserves. Several non-noble metal oxides were reported for the NO reduction owing to their low price, such as Cu−Ce/TiO 2 [8], Co 3 O 4 [9], Cu/CeO 2 −Fe 2 O 3 [10], Fe/ZSM-5 [11], FeO x /CeO 2 [12], and so on. Still, most of them have low reaction activity and N 2 selectivity at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

NO reduction with CO over a highly dispersed Mn/TiO₂ catalyst at low temperature: a combined experimental and theoretical study

Zhang¹,

Li²,

Liu³

et al. 2021

Nanotechnology

View full text Add to dashboard Cite

A highly dispersed Mn/TiO2 catalyst, which has high efficiency for NO conversion with CO and almost completed N2 selectivity at a low-temperature range (350–550 K), was investigated using experimental and DFT theoretical calculation. The characterization results illustrated that the catalyst assembled with nanoparticles and the Mn doping into the TiO2 surface lattice led to the formation of Mn–O–Ti configuration, which enhanced the dispersion of Mn on the body of TiO2. The DFT study mapped out the complete catalytic cycle, including reactants adsorption, oxygen vacancy generation, N2O intermediates formation, N2 formation in Eley−Rideal (ER), Langmuir−Hinshelwood, and termolecular Eley−Rideal mechanisms. With thermodynamic and kinetic analysis combined with experimental results, the ER reaction process was considered to be the fundamental mechanism over the highly dispersed Mn/TiO2 catalyst. The calculation results indicated that N2O was a significant intermediate. However, the rapid N2O reduction process led to high N2 selectivity. The rate-limiting step was the deoxygenation step of NO−MnOv/TiO2 from N−O bond scission. The active site Mn−Ov pair embedded in Mn/TiO2 was responsible not only for the formation of N−Mn/TiO2 in the ER-1 step but also for the N2O deoxygenation process to make the final product N2 in the ER-2 step. The synergetic effect between Mn 3d electron and the oxygen vacancy of TiO2 were responsible for the catalytic activity of Mn/TiO2.

show abstract

“…Many efforts have recently been devoted to reduce and control NO x from the air using different technologies, such as selective catalytic reduction (SCR) that converts harmful NO x to harmless N 2 . Considerable attention has been given to the development of SCR of NO x using CO, which can efficiently remove NO and CO co-existing in many industrial exhaust gases [1][2][3]. However, this method has several challenges, such as resistance to O 2 and SO 2 , ensuring low-temperature activation, and durable operation.…”

Section: Introductionmentioning

confidence: 99%

Promotional Effect of Manganese on Selective Catalytic Reduction of NO by CO in the Presence of Excess O2 over M@La–Fe/AC (M = Mn, Ce) Catalyst

Gholami

Martı́n

et al. 2020

Catalysts

Self Cite

View full text Add to dashboard Cite

The catalytic performance of a series of La-Fe/AC catalysts was studied for the selective catalytic reduction (SCR) of NO by CO. With the increase in La content, the Fe2+/Fe3+ ratio and amount of surface oxygen vacancies (SOV) in the catalysts increased; thus the catalytic activity improved. Incorporating the promoters to La3-Fe1/active carbon (AC) catalyst could affect the catalyst activity by changing the electronic structure. The increase in Fe2+/Fe3+ ratio after the promoter addition is possibly due to the extra synergistic interaction of M (Mn and Ce) and Fe through the redox equilibrium of M3+ + Fe3+ ↔ M4+ + Fe2+. This phenomenon could have improved the redox cycle, enhanced the SOV formation, facilitated NO decomposition, and accelerated the CO-SCR process. The presence of O2 enhanced the formation of the C(O) complex and improved the activation of the metal site. Mn@La3-Fe1/AC catalyst revealed an excellent NO conversion of 93.8% at 400 °C in the presence of 10% oxygen. The high catalytic performance of MnOx and double exchange behavior of Mn3+ and Mn4+ can increase the number of SOV and improve the catalytic redox properties.

show abstract

The influence of support composition on the activity of Cu:Ce catalysts for selective catalytic reduction of NO by CO in the presence of excess oxygen

Abstract: Excellent catalytic performance for NO reduction by CO in the presence of 5% O2 over Cu1:Ce3/Al2O3.

Cited by 20 publications

References 65 publications

Recent Advances of Cu-Based Catalysts for NO Reduction by CO under O2-Containing Conditions

Recent Advances of Cu-Based Catalysts for NO Reduction by CO under O2-Containing Conditions

NO reduction with CO over a highly dispersed Mn/TiO₂ catalyst at low temperature: a combined experimental and theoretical study

Promotional Effect of Manganese on Selective Catalytic Reduction of NO by CO in the Presence of Excess O2 over M@La–Fe/AC (M = Mn, Ce) Catalyst

Contact Info

Product

Resources

About

The influence of support composition on the activity of Cu:Ce catalysts for selective catalytic reduction of NO by CO in the presence of excess oxygen

Abstract: Excellent catalytic performance for NO reduction by CO in the presence of 5% O2 over Cu1:Ce3/Al2O3.

Cited by 20 publications

References 65 publications

Recent Advances of Cu-Based Catalysts for NO Reduction by CO under O2-Containing Conditions

Recent Advances of Cu-Based Catalysts for NO Reduction by CO under O2-Containing Conditions

NO reduction with CO over a highly dispersed Mn/TiO2 catalyst at low temperature: a combined experimental and theoretical study

Promotional Effect of Manganese on Selective Catalytic Reduction of NO by CO in the Presence of Excess O2 over M@La–Fe/AC (M = Mn, Ce) Catalyst

Contact Info

Product

Resources

About

NO reduction with CO over a highly dispersed Mn/TiO₂ catalyst at low temperature: a combined experimental and theoretical study