In-plasma-catalysis for NOx degradation by Ti3+ self-doped TiO2−x/γ-Al2O3 catalyst and nonthermal plasma

Yang, Xingdong; Qu, Jiyan; Wang, Linxi; Luo, Jianhong

doi:10.1039/d1ra02847b

Cited by 7 publications

(2 citation statements)

References 51 publications

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“…Non-thermal plasma generates a wide range of active species (energetic electrons, ions, radicals, and excited species) in a gaseous mixture that can lead to various chemical reactions. , Several works illustrate the use of dielectric barrier discharge (DBD) to generate a stable plasma under atmospheric conditions for NO x removal application. − The NO x removal capacity of DBD plasma is highly satisfactory for low gas flow rates. However, it is not advantageous for a high flow rate due to the limited discharge gap between the electrodes.…”

Section: Introductionmentioning

confidence: 99%

Essential Features of Gliding Arc Plasma for High-Performance Hydrocarbon Selective Catalytic Reduction of NO_xat Low Temperatures

Denra

Matyakubov

Saud

et al. 2023

Ind. Eng. Chem. Res.

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The high removal efficiency of NO x from diesel engine exhaust gas at low temperatures remains challenging due to the poor activity of catalysts under this condition. This work investigated the effectiveness of gliding arc plasma in the NO x removal over the Ag/γ-Al 2 O 3 catalyst with n-heptane as a reducing agent source for NO x reduction. The plasma conjugated with the catalyst was performed like an injection method, i.e., a small part flow (1/26) that consisted of n-heptane was reformed to H 2 and oxygenated hydrocarbons (OHCs) by gliding arc plasma before mixing it with the gas containing NO x . Then, the overall gas was passed through the catalyst stage at various temperatures from 127 to 253 °C. The experimental data revealed that NO x removal efficiency significantly increased with plasma treatment. The enhancement by plasma treatment increased with temperature from 127 to 226 °C, but the enhancement reduced at a temperature of 253 °C. The result came from formation of H 2 and OHCs in the treated plasma gas, which reactivated NO x removal over the catalyst at low temperatures. Moreover, the enhanced NO x removal efficiency in a wide low-temperature range is obtained due to considerable hydrogen formation by the gliding arc plasma. To sum up, the highest NO x removal efficiency was 68.5% under a temperature of 226 °C and specific energy input of 34.6 J/L, while it was 20.3% for the catalyst alone; in other words, the removal efficiency increased by 48.1% with using plasma under these conditions. Owing to its low energy consumption, high-throughput gas treatment, and effectiveness at low temperatures, the technology is promising in practical applications for refining diesel exhaust gases.

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Section: Introductionmentioning

confidence: 99%

Essential Features of Gliding Arc Plasma for High-Performance Hydrocarbon Selective Catalytic Reduction of NO_xat Low Temperatures

Denra

Matyakubov

Saud

et al. 2023

Ind. Eng. Chem. Res.

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“…, Ni 2+ , Co 2+ , Zn 2+ , or even lanthanides) − for the construction of such frameworks. However, there are very few reports on MTN MOFs containing titanium in the +III oxidation state − or more generally reports on the incorporation of Ti III in metal–organic frameworks, − although Ti 3+ open-metal centers in other types of materials are known to be efficient sites for hydrogen sorption, catalysis, or other applications. − …”

Section: Introductionmentioning

confidence: 99%

Synthesis, Structure, and Thermal Stability of a Mesoporous Titanium(III) Amine-Containing MOF

et al. 2022

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The first mesoporous bimetallic TiIII/Al metal–organic framework (MOF) containing amine functionalities on its linkers has been selectively obtained by converting the cheap commercially available (TiCl3)3AlCl3 into Ti3–x Al x Cl3(THF)3 and reacting this complex with 2-aminoterephthalic acid in dimethylformamide (DMF) under soft solvothermal conditions. This compound is structurally related to the previously described NH2-MIL-101(M) (M = Cr, Al, and Fe) MOFs. Thermal gravimetric analyses and in situ powder X-ray diffraction (PXRD) measurements demonstrated that this highly air-sensitive TiIII-containing MOF is structurally stable up to 200 °C. Nuclear magnetic resonance (NMR) spectroscopy, elemental analysis, and inductively coupled plasma (ICP) revealed that NH2-MIL-101(TiIII) contains trinuclear Ti3(μ3-O)Cl(DMF)2(RCOO)6 clusters with strongly bound DMF molecules and a small amount of aluminum. Sorption experiments revealed a higher affinity of this MOF for hydrogen compared to the previously described monometallic unfunctionalized MIL-101(TiIII) MOF.

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Recent advances of non-noble metals based plasma materials in photocatalysis

Li,

Rao,

Tang

et al. 2024

Coordination Chemistry Reviews

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In-plasma-catalysis for NO_x degradation by Ti³⁺ self-doped TiO_2−x/γ-Al₂O₃ catalyst and nonthermal plasma

Abstract: TiO2−x has a smaller forbidden band width, more abundant Ti3+ and oxygen vacancies, so as to obtain a better and more stable degradation effect of NOx in plasma-catalysis process.

Cited by 7 publications

References 51 publications

Essential Features of Gliding Arc Plasma for High-Performance Hydrocarbon Selective Catalytic Reduction of NO_xat Low Temperatures

Essential Features of Gliding Arc Plasma for High-Performance Hydrocarbon Selective Catalytic Reduction of NO_xat Low Temperatures

Synthesis, Structure, and Thermal Stability of a Mesoporous Titanium(III) Amine-Containing MOF

Recent advances of non-noble metals based plasma materials in photocatalysis

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In-plasma-catalysis for NOx degradation by Ti3+ self-doped TiO2−x/γ-Al2O3 catalyst and nonthermal plasma

Abstract: TiO2−x has a smaller forbidden band width, more abundant Ti3+ and oxygen vacancies, so as to obtain a better and more stable degradation effect of NOx in plasma-catalysis process.

Cited by 7 publications

References 51 publications

Essential Features of Gliding Arc Plasma for High-Performance Hydrocarbon Selective Catalytic Reduction of NOxat Low Temperatures

Essential Features of Gliding Arc Plasma for High-Performance Hydrocarbon Selective Catalytic Reduction of NOxat Low Temperatures

Synthesis, Structure, and Thermal Stability of a Mesoporous Titanium(III) Amine-Containing MOF

Recent advances of non-noble metals based plasma materials in photocatalysis

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In-plasma-catalysis for NO_x degradation by Ti³⁺ self-doped TiO_2−x/γ-Al₂O₃ catalyst and nonthermal plasma

Essential Features of Gliding Arc Plasma for High-Performance Hydrocarbon Selective Catalytic Reduction of NO_xat Low Temperatures

Essential Features of Gliding Arc Plasma for High-Performance Hydrocarbon Selective Catalytic Reduction of NO_xat Low Temperatures