Low-temperature selective catalytic reduction of NOx with NH3 over an activated carbon-carbon nanotube composite material prepared by in situ method

Wang, Pengchen; Lu, Yong; Pu, Yijuan; Yang, Lin; Jiang, Xia; Jiang, Wenju

doi:10.1039/c9ra08640d

Cited by 16 publications

(11 citation statements)

References 36 publications

(42 reference statements)

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“…Carbonaceous materials, such as activated carbon 8 , 9 , carbon nanotube 10 , biochar/biocarbon 11 , et al have been attracting considerable interest in the field of air pollution control. The use of activated coke (AC)-based catalyst, in particular, has good potential for industrial application due to its relatively low cost and excellent adaptability 12 .…”

Section: Introductionmentioning

confidence: 99%

Co-blending modification of activated coke using pyrolusite and titanium ore for low-temperature NOx removal

Yang

Lai

et al. 2020

Sci Rep

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Activated coke (AC) has great potential in the field of low-temperature NO removal (DeNOx), especially the branch prepared by blending modification. In this study, the AC-based pyrolusite and/or titanium ore blended catalysts were prepared and applied for DeNOx. The results show blending pyrolusite and titanium ore promoted the catalytic performance of AC (Px@AC, Tix@AC) clearly, and the co-blending of two of them showed a synergistic effect. The (P/Ti-1/2)15@AC performed the highest NO conversion of 66.4%, improved 16.9% and 16.0% respectively compared with P15@AC and Ti15@AC. For the (P/Ti-1/2)15@AC DeNOx, its relative better porous structure (SBET = 364 m2/g, Vmic = 0.156 cm3/g) makes better mass transfer and more active sites exposure, stronger surface acidity (C–O, 19.43%; C=O, 4.16%) is more favorable to the NH3 adsorption, and Ti, Mn and Fe formed bridge structure fasted the lactic oxygen recovery and electron transfer. The DeNOx of (P/Ti-1/2)15@AC followed both the E–R and L–H mechanism, both the gaseous and adsorbed NO reacted with the activated NH3 due to the active sites provided by both the carbon and titanium.

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Section: Introductionmentioning

confidence: 99%

Co-blending modification of activated coke using pyrolusite and titanium ore for low-temperature NOx removal

Yang

Lai

et al. 2020

Sci Rep

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“…3,4 Traditional commercial vanadium-titanium catalysts have been used in various industrial elds due to their stability and high efficiency, but industrial application is still restrained by their inevitable drawbacks, including high operation temperature window, poisoning and deactivation of catalyst by deposited alkaline metal, and vanadium poisoning. [5][6][7] Therefore, it is necessary to develop NH 3 -SCR catalysts with excellent denitration activity in low temperature ranges.…”

Section: Introductionmentioning

confidence: 99%

Promotional mechanism of enhanced denitration activity with Cu modification in a Ce/TiO₂–ZrO₂ catalyst for a low temperature NH₃-SCR system

et al. 2022

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“…The graphite (002) plane reflection at 2θ = 26.6°reveals that the CNTs grew successfully. 28,32 The Ce/CAC-CNTs show weak CeO 2 peaks at 2θ = 28.6, 33.0, 47.7, and 56.6°(JCPDS 34-0394), 33 pointing to the excellent dispersibility of ceria on the surface of CAC-CNTs. The Ce/ CAC-CNTs with or without Cu had very similar XRD patterns, especially the Cu 0.2 Ce/CAC-CNTs, indicating that Cu doping did not change the matrix of Cu x Ce/CAC-CNTs.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Regarding air pollution control, Wang et al prepared the AC-CNTs by the in situ growth method, and the CeO x -doped AC-CNT (Ce/AC-CNT) was 1.41 times higher than the CeO x -doped AC (Ce/AC) at 150 °C. 28 The cost estimate shows that the cost of AC-CNTs prepared by the in situ growth method is only about 2% of the pure CNTs used. All of the above research indicate a great promise of the AC-CNT carrier for SCR application.…”

Section: ■ Introductionmentioning

confidence: 80%

Copper Doping Promotion on Ce/CAC-CNT Catalysts with High Sulfur Dioxide Tolerance for Low-Temperature NH₃–SCR

Yang

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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The stumbling block to the ever-increasing need for improving air quality remains nitrogen oxides (NO x ). The copper-introduced Ce/CAC-CNT (Cu x Ce/CAC-CNTs) catalyst using the in situ-growth-prepared activated carbon and carbon-nanotube composite (CAC-CNT) carrier with high sulfur dioxide tolerance was successfully applied to low-temperature NH3–SCR in this study. The findings indicate that the Cu x Ce/CAC-CNTs obtained at a 0.2 Cu/Ce molar ratio and the calcination temperature of 450 °C showed the highest 100% NO conversion with 95.8% N2 selectivity at 150 °C and 10 000 h–1. The incorporation of Cu improved the Cu0.2Ce/CAC-CNTs in Lewis acid, lattice oxygen (31.99%), and Ce3+ (26.03%). The accelerated NH3 adsorption on acid sites, the encouraging electron transfer by the Ce4+ + Cu+ ↔ Ce3+ + Cu2+ redox circle, and the more surface chemisorbed oxygen (Oβ) improved the catalytic activity of Cu0.2Ce/CAC-CNTs. The NH3–SCR of Cu0.2Ce/CAC-CNTs largely follows the L–H mechanism, together with a certain degree of “Fast SCR.” The added Cu species effectively prevented surface SO2 adsorption and oxidation, and the Cu0.2Ce/CAC-CNTs restored more than 94% SCR activity after 8 h of poisoning in 50 ppm SO2 and 5 vol % H2O.

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Low-temperature selective catalytic reduction of NO_x with NH₃ over an activated carbon-carbon nanotube composite material prepared by in situ method

Abstract: A Ce-supported activated carbon-carbon nanotube composite (Ce/AC-CNTs) catalyst was prepared by in situ formation of CNTs on AC and then modified by Ce, and was subsequently used for low-temperature selective catalytic reduction of NOx with NH3.

Cited by 16 publications

References 36 publications

Co-blending modification of activated coke using pyrolusite and titanium ore for low-temperature NOx removal

Co-blending modification of activated coke using pyrolusite and titanium ore for low-temperature NOx removal

Promotional mechanism of enhanced denitration activity with Cu modification in a Ce/TiO₂–ZrO₂ catalyst for a low temperature NH₃-SCR system

Copper Doping Promotion on Ce/CAC-CNT Catalysts with High Sulfur Dioxide Tolerance for Low-Temperature NH₃–SCR

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Low-temperature selective catalytic reduction of NOx with NH3 over an activated carbon-carbon nanotube composite material prepared by in situ method

Abstract: A Ce-supported activated carbon-carbon nanotube composite (Ce/AC-CNTs) catalyst was prepared by in situ formation of CNTs on AC and then modified by Ce, and was subsequently used for low-temperature selective catalytic reduction of NOx with NH3.

Cited by 16 publications

References 36 publications

Co-blending modification of activated coke using pyrolusite and titanium ore for low-temperature NOx removal

Co-blending modification of activated coke using pyrolusite and titanium ore for low-temperature NOx removal

Promotional mechanism of enhanced denitration activity with Cu modification in a Ce/TiO2–ZrO2 catalyst for a low temperature NH3-SCR system

Copper Doping Promotion on Ce/CAC-CNT Catalysts with High Sulfur Dioxide Tolerance for Low-Temperature NH3–SCR

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About

Low-temperature selective catalytic reduction of NO_x with NH₃ over an activated carbon-carbon nanotube composite material prepared by in situ method

Promotional mechanism of enhanced denitration activity with Cu modification in a Ce/TiO₂–ZrO₂ catalyst for a low temperature NH₃-SCR system

Copper Doping Promotion on Ce/CAC-CNT Catalysts with High Sulfur Dioxide Tolerance for Low-Temperature NH₃–SCR