Research progress, challenges and perspectives on the sulfur and water resistance of catalysts for low temperature selective catalytic reduction of NOx by NH3

Wang, Huaijian; Huang, Bichun; Yu, Changming; Lu, Meijuan; Huang, Hong Zhong; Zhou, Yuelong

doi:10.1016/j.apcata.2019.117207

Cited by 106 publications

(30 citation statements)

References 254 publications

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“…Comprehensive analysis of the surface acidity and redox performance of the biochar based catalysts, it shows that the redox performance of each catalyst is relatively different and the catalyst with stronger redox performance has better SCR performance at low temperature. This is consistent with the conclusion that redox capacity of the catalyst is the key to ensure the low temperature activity of the catalyst, which is has been reported in many literatures (Li et al, 2011;Jiang et al, 2019a, b;Wang et al, 2019).…”

Section: Nh 3 -Tpd Analysissupporting

confidence: 92%

Agricultural Waste Derived Catalysts for Low Temperature SCR Process: Optimization of Preparation Process, Catalytic Activity and Characterization

Wang

et al. 2020

Aerosol Air Qual. Res.

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Carbon-based catalytic materials have received significant attention for low temperature flue gas denitrification (DeNO x ) process, due to their physicochemical properties and ease of modification. To improve the DeNO x efficiency, preparation of biochar catalyst supports was conducted that included the acid treatment of the agricultural wastes rice straw, corn cobs and lotus leaves. Taguchi experimental design (3 4 ) was employed to screen suitable carbon materials and optimize the preparation parameters of the biochar. All of the acid-modified and unmodified samples were evaluated to determine their performance and they were characterized by using SEM, BET and FT-IR analysis. The experimental and characterization results showed that acid modification of the biochars improved their DeNO x performance, which may have been due to the changes in the physical and chemical properties of the carbon material following the acid treatment. The optimum combination in the acid modification procedure was found to be the use of lotus leaf carbon treated with an acid/mass ratio of 1.50 and a pyrolysis temperature of 800°C. The biochar prepared using these optimum preparation parameters were then employed as a carrier to support an active catalyst component (MnO x ). The lotus leaf biochar supported 10 wt% manganese catalyst prepared using ultrasonic impregnation method exhibited nearly 90% NO x conversion at 250°C at a high space velocity of 45, 000 -1 , and it exhibited strong resistance to H 2 O. Additional studies showed that higher redox capacity and suitable surface acidity were two of the deciding factors in the improved low temperature SCR performance of the 10% Mn/LBC catalysts.

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Section: Nh 3 -Tpd Analysissupporting

confidence: 92%

Agricultural Waste Derived Catalysts for Low Temperature SCR Process: Optimization of Preparation Process, Catalytic Activity and Characterization

Wang

et al. 2020

Aerosol Air Qual. Res.

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“…In order to control the emission of NO, selective catalytic reduction (SCR) methods have been used to reduce NO to non-toxic and harmless N 2 , using NH 3 as the reducing agent (Li et al, 2011;Wang et al, 2019b). However, there are also some problems in traditional SCR technologies, such as high expense of catalysts, sensitivity to temperature, emission of NH 3 affecting downstream equipment, and so on (Yang and Pan, 2007;Ko et al, 2019;Wang et al, 2019a). In order to realize the reduction of NO, it is also feasible to apply a current.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Performance of Ba0.5Sr0.5Co0.8Fe0.2O3−δ in Symmetric Cells With Sm0.2Ce0.8O1.9 Electrolyte for Nitric Oxide Reduction Reaction

et al. 2020

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The emission of nitric oxide from the combustion process of fossil fuels causes air pollution problems. In addition to traditional removal methods, nitric oxide can be removed by the electrochemical reduction method. In this study, Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ powders were synthesized using a solid-state reaction method. Symmetrical cells, with Sm 0.2 Ce 0.8 O 1.9 as the electrolyte and Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ as the electrodes, were prepared as the electrochemical reactor for nitric oxide reduction. In the process of electrochemical reduction, nitric oxide reduction occurs at the cathode and oxygen evolution occurs at the anode. To study the nitric oxide reduction performance of the electrode, impedances of the symmetrical cell in different atmospheres were analyzed. For the nitric oxide conversion in symmetric cells, two different modes, dual chamber and single chamber, were applied. Results demonstrated that the denitrification performance of the double chamber was better but the single chamber mode had other advantages in its simple structure. Presliminary stability results of the single chamber symmetric cell show that the electrochemical reduction of nitric oxide in symmetric cells with BSCF performed most reliably.

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“…The catalyst is the key factor that can determine the efficiency of the selective catalytic reduction system [1]. The temperature window of traditional commercial catalyst (V 2 O 5 -WO 3 (MoO 3 )/TiO 2 ) is 300-400 • C, and low-temperature NH 3 -SCR catalysts, which can be placed downstream of the desulfurizer and electrostatic precipitator, have attracted increasing attention in recent years [2]. Research on the low-temperature NH 3 -SCR reaction using transition metal oxides (MnO x [3], FeO x [4], CuO x [5], CeO x [6]) as the active components has become widespread.…”

Section: Introductionmentioning

confidence: 99%

“…Due to their adjustable pore sizes and unique structural properties, Gao et al [10] demonstrated manganese oxide nanoparticles with a hierarchical mesopore structure in the walls of the macroporous skeleton supported by three-dimensionally ordered macroporous carbon, which exhibited better low-temperature NH 3 -SCR reaction activity, stability, as well as H 2 O and SO 2 resistance. Fang et al [11] prepared foam-like Fe 2 O 3 @CuO x monolith catalysts with a three-dimensional hierarchical structure and displayed a higher activity, stability, as well as SO 2 and H 2 O resistance than the catalyst without Fe 2 O 3 . In addition, some research studies have also focused on the hierarchical zeolite supported metal oxides.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Catalytic Performance of Hierarchical MnOx/ZSM-5 Catalyst for the Low-Temperature NH3-SCR

Shao

Cheng

et al. 2020

Catalysts

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A ZSM-5 zeolite with a hierarchical pore structure was synthesized by the desilication-recrystallization method using tetraethyl ammonium hydroxide (TEAOH) and cetyltrimethylammonium bromide (CTAB) as the desilication and structure-directing agents, respectively. The MnO x /ZSM-5 catalyst was synthesized by the ethanol dispersion method and applied for the low-temperature selective catalytic reduction of NO x with NH 3 . The results showed that NO x conversion of the hierarchical MnO x /ZSM-5 catalyst could reach 100% at about 120 • C and could be maintained in the temperature range of 120-240 • C with N 2 selectivity over 90%. Furthermore, the hierarchical MnO x /ZSM-5catalyst presented better SO 2 resistance performance than the traditional catalyst in the presence of 100 ppm SO 2 at 120 • C. XRD, SEM, TEM, XPS, BET, NH 3 -TPD, and TG were applied to characterize the structural properties of the MnO x /ZSM-5 catalysts. These results showed that the MnO x /ZSM-5 catalyst had micropores (0.78 nm) and mesopores (3.2 nm) leading to a larger specific surface area, which improved the mass transfer of reactants and products while reducing the formation of sulfates. The better catalytic performance over hierarchical MnO x /ZSM-5 catalyst could be attributed to the higher concentration of Mn 4+ and chemisorbed oxygen species and higher surface acidity. The improved SO 2 resistance was related to the catalyst's hierarchical pore structure.

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Research progress, challenges and perspectives on the sulfur and water resistance of catalysts for low temperature selective catalytic reduction of NOx by NH3

Cited by 106 publications

References 254 publications

Agricultural Waste Derived Catalysts for Low Temperature SCR Process: Optimization of Preparation Process, Catalytic Activity and Characterization

Agricultural Waste Derived Catalysts for Low Temperature SCR Process: Optimization of Preparation Process, Catalytic Activity and Characterization

Electrochemical Performance of Ba0.5Sr0.5Co0.8Fe0.2O3−δ in Symmetric Cells With Sm0.2Ce0.8O1.9 Electrolyte for Nitric Oxide Reduction Reaction

Enhanced Catalytic Performance of Hierarchical MnOx/ZSM-5 Catalyst for the Low-Temperature NH3-SCR

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