Kinetic study of NO reduction on carbon-supported chromium catalysts

Rosas, Juana M.; Ruiz-Rosas, Ramiro; Rodríguez-Mirasol, José; Cordero, Tomás

doi:10.1016/j.cattod.2011.10.032

Cited by 22 publications

(15 citation statements)

References 19 publications

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“…19 Carbon materials in the presence or absence of additional metals are extensively used in NO x treatment. 20,21 Carbon-based materials loaded with transition metals, such as Co, 22 Cr, 23 and Cu, 24 also reveal high activity in NO x reduction by CO below 300 °C in the absence of O 2 . Carbon nanotubes (CNTs) are interesting and competitive supports for heterogeneous catalysts given their high mechanical strength, high thermal and electrical conductivity and adsorption, unique nanostructure, mechanical and thermal properties, and hydrophobicity.…”

Section: Introductionmentioning

confidence: 99%

“…Supported copper-based catalysts are extensively studied using different support materials, such as alumina, zirconia, , and mesoporous silica . Carbon materials in the presence or absence of additional metals are extensively used in NO x treatment. , Carbon-based materials loaded with transition metals, such as Co, Cr, and Cu, also reveal high activity in NO x reduction by CO below 300 °C in the absence of O 2 . Carbon nanotubes (CNTs) are interesting and competitive supports for heterogeneous catalysts given their high mechanical strength, high thermal and electrical conductivity and adsorption, unique nanostructure, mechanical and thermal properties, and hydrophobicity. , Previous research − indicated that CNT is a good option as a support because of the excellent properties of CNT in CO oxidation and NO reduction.…”

Section: Introductionmentioning

confidence: 99%

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Low-Temperature Selective Catalytic Reduction of NO by CO in the Presence of O₂ over Cu:Ce Catalysts Supported by Multiwalled Carbon Nanotubes

Gholami

Luo

2018

Ind. Eng. Chem. Res.

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The catalytic activity of a series of Cu–Ce catalysts supported on carbon nanotubes was studied for NO reduction by CO. The 20 wt % Cu1:Ce3/CNT catalyst showed the highest NO x conversion of 96% at 220 °C in the presence of oxygen (O2/CO ≤ 0.6). The catalytic activity of the CNT-supported catalysts was significantly enhanced due to synergistic interactions between surface oxygen vacancies and Cu+ species in the CNT-supported catalysts. Shifting of redox equilibrium to right (Cu2+ + Ce3+ ↔ Cu+ + Ce4+) resulted in creation of more reduced state Cu+. In the presence of excess oxygen (O2/CO ≥ 0.6), the catalyst can effectively catalyze the CO–O2 reaction and the NO + CO reaction did not occur. Compared with Cu1:Ce3/CNT catalyst, Cu1:Ce3 catalyst supported on activated carbon showed lower activity due to the lower Cu+/Cu2+. A possible reaction mechanism was proposed, providing insight into the catalytic reactions between NO and CO.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-Temperature Selective Catalytic Reduction of NO by CO in the Presence of O₂ over Cu:Ce Catalysts Supported by Multiwalled Carbon Nanotubes

Gholami

Luo

2018

Ind. Eng. Chem. Res.

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“…Recently, carbon-based materials have been investigated as catalysts or supports for the NO + CO reaction. 34,35 It was established that carbonaceous species could activate NO reacting with CO, additionally, Cr introduction would enhanced the reaction greatly. Besides Cr addition, metal or acid modication can also enhance the reaction of NO + CO over carbon-based materials.…”

Section: Introductionmentioning

confidence: 99%

In situ DRIFTS study of the NO + CO reaction on Fe–Co binary metal oxides over activated semi-coke supports

Wang

Cheng

et al. 2017

RSC Adv.

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“…Figure 7a shows that the maximum NO conversion of 64.4% was obtained for Fe/AC at 400 • C. The addition of transition metal oxides into the catalyst can improve the redox properties and thermal stability of the composite materials. It has been reported that the carbon-based materials loaded with transition metals reveal high activity in NO x reduction by CO [16,50]. The physicochemical properties of the catalyst can affect the catalytic pathway [51,52].…”

Section: Catalytic Activity Evaluationmentioning

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

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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.

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Kinetic study of NO reduction on carbon-supported chromium catalysts

Cited by 22 publications

References 19 publications

Low-Temperature Selective Catalytic Reduction of NO by CO in the Presence of O₂ over Cu:Ce Catalysts Supported by Multiwalled Carbon Nanotubes

Low-Temperature Selective Catalytic Reduction of NO by CO in the Presence of O₂ over Cu:Ce Catalysts Supported by Multiwalled Carbon Nanotubes

In situ DRIFTS study of the NO + CO reaction on Fe–Co binary metal oxides over activated semi-coke supports

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

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Kinetic study of NO reduction on carbon-supported chromium catalysts

Cited by 22 publications

References 19 publications

Low-Temperature Selective Catalytic Reduction of NO by CO in the Presence of O2 over Cu:Ce Catalysts Supported by Multiwalled Carbon Nanotubes

Low-Temperature Selective Catalytic Reduction of NO by CO in the Presence of O2 over Cu:Ce Catalysts Supported by Multiwalled Carbon Nanotubes

In situ DRIFTS study of the NO + CO reaction on Fe–Co binary metal oxides over activated semi-coke supports

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

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Low-Temperature Selective Catalytic Reduction of NO by CO in the Presence of O₂ over Cu:Ce Catalysts Supported by Multiwalled Carbon Nanotubes

Low-Temperature Selective Catalytic Reduction of NO by CO in the Presence of O₂ over Cu:Ce Catalysts Supported by Multiwalled Carbon Nanotubes