Decomposition of nitric oxide over perovskite oxide catalysts: effect of CO2, H2O and CH4

Tofan, C

doi:10.1016/s0926-3373(01)00312-5

Cited by 78 publications

(16 citation statements)

References 22 publications

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“…It has been reported extensively that water vapor in the feed will inhibit the catalytic performance of perovskite-type oxide catalysts in the directd ecomposition of NO in the CRM. [2,59] We investigated the effect of water vapor on NO conversion and N 2 selectivity over BaCoO 3 mixed oxide (one of the most active catalysts of thet hree mixed oxidesi nt his study) in the MCRM. The NO conversion and N 2 selectivity display slight decreases in the presence of 5% H 2 O( Figure8).…”

Section: Effects Of Water Vapor In the Feed In The Mcrmmentioning

confidence: 99%

ChemInform Abstract: Highly Effective Direct Decomposition of Nitric Oxide by Microwave Catalysis over BaMeO₃ (Me: Mn, Co, Fe) Mixed Oxides at Low Temperature under Excess Oxygen.

Cai

Zhou

et al. 2016

ChemInform

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Highly Effective Direct Decomposition of Nitric Oxide by Microwave Catalysis over BaMeO 3 (Me: Mn, Co, Fe) Mixed Oxides at Low Temperature under ExcessOxygen. -BaMO 3 (M: Mn, Co, Fe) mixed oxide NOx decomposition co-catalysts are prepared by sol gel reaction of an aqueous M(NO3)2 solution with citric acid and ethylene glycol is given (80 C) followed by calcination in air (1. 400 C, 2 h, 2. 700 C, 4 h). NO decomposition through microwave catalysis under excess O 2 shows that the BaCoO 3 catalyst has an outstanding activity with a high NO conversion and N2 selectivity of up to 99.8 and 99.9%, resp., even at 250 C. Furthermore, the catalyst shows a superior resistance to H2O vapor. BaMnO3 and BaFeO3 exhibit best NO conversions of 93.7 and only 64.1% under microwave irradiation, respectively. Temperature-programmed H 2 reduction and O2 desorption, as well as microwave-absorbing properties of the mixed oxides are systematically studied in terms of clarifying differences in the catalytic performance. Apparent activation energies of 33.4, 13.7, and 46.7 kJ/mol for BaMnO 3, BaCoO3, and BaFeO3, resp., suggest a significant microwave catalytic effect. -(XU, W.; CAI, J.; ZHOU*, J.; OU, Y.; LONG, W.; YOU, Z.; LUO, Y.; ChemCatChem 8 (2016) 2, 417-425, http://dx.

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Section: Effects Of Water Vapor In the Feed In The Mcrmmentioning

confidence: 99%

ChemInform Abstract: Highly Effective Direct Decomposition of Nitric Oxide by Microwave Catalysis over BaMeO₃ (Me: Mn, Co, Fe) Mixed Oxides at Low Temperature under Excess Oxygen.

Cai

Zhou

et al. 2016

ChemInform

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“…In fact, higher carbon dioxide concentrations have nearly no additional effect; therefore, the inhibition effect apparently reached saturation. 48,69 In these conditions, active sites for hydrocarbon oxidation could be blocked by carbon dioxide, and propane conversion drops to a certain Figure 6. Effect of carbon dioxide concentration on nitrous oxide (a) and propane (b) conversions for the reduction of nitrous oxide with propane over Fe-ZSM-5 supported on ceramic monoliths at 500 (9) and 350°C (b).…”

Section: Effect Of Carbon Dioxide Concentrationmentioning

confidence: 99%

Bench-Scale Experimental Study on the Effect of the Fluidized Bed Combustion Off-Gas Composition on the Reduction of Nitrous Oxide by Propane over an Fe-Zeolite Monolith

Ruiz

Sánchez

Otero

2004

Ind. Eng. Chem. Res.

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The selective catalytic reduction (SCR) of nitrous oxide with propane has been investigated at bench scale over an Fe-zeolite monolith in the presence of the different gaseous constituents typically found in fluidized bed combustion (FBC) off-gases. The catalytic system shows high activity and selectivity irrespective of the feeding gas composition. The increment of nitrous oxide or carbon dioxide feed concentration has no significant effect on the nitrous oxide SCR. Oxygen improves the activity of the catalyst for the nitrous oxide SCR, irrespective of its feeding gas concentration. Water, sulfur dioxide, and nitric oxide exhibit an inhibiting effect on the nitrous oxide SCR, which rises, upon increasing feed concentration and decreasing temperature. For all cases, a high process temperature is beneficial for nitrous oxide removal efficiency and lowers the hydrocarbon slip emission, conditioning catalyst location in FBC installations.

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“…For example, the N 2 yield achieved with La 0.2 Ba 0.8 Mn 0.8 Mg 0.2 O 3 reaches 85% in the absence of CO 2 at 850°C, but it decreases dramatically to below 20% in the presence of 5% CO 2 (Iwakuni, 2008). Furthermore, activity of perovskite-type catalysts may be influenced by the presence of H 2 O (g) (Tofan et al, 2002). Since CO 2 , O 2 , and H 2 O (g) commonly exist in industrial flue gases, tolerances of CO 2 , O 2 , and H 2 O (g) should be considered for field application.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of nitric oxide decomposition efficiency achieved with lanthanum-based perovskite-type catalyst

Pan

Chen

Sheng

et al. 2016

Journal of the Air & Waste Management Association

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Direct decompositions of nitric oxide (NO) by La 0.7 Ce 0.3 SrNiO 4 , La 0.4 Ba 0.4 Ce 0.2 SrNiO 4 , and Pr 0.4 Ba 0.4 Ce 0.2 SrNiO 4 are experimentally investigated, and the catalysts are tested with different operating parameters to evaluate their activities. Experimental results indicate that the physical and chemical properties of La 0.7 Ce 0.3 SrNiO 4 are significantly improved by doping with Ba and partial substitution with Pr. NO decomposition efficiencies achieved with La 0.4 Ba 0.4 Ce 0.2 SrNiO 4 and Pr 0.4 Ba 0.4 Ce 0.2 SrNiO 4 are 32% and 68%, respectively, at 400°C with He as carrier gas. As the temperature is increased to 600°C, NO decomposition efficiencies achieved with La 0.4 Ba 0.4 Ce 0.2 SrNiO 4 and Pr 0.4 Ba 0.4 Ce 0.2 SrNiO 4 , respectively, reach 100% with the inlet NO concentration of 1000 ppm while the space velocity is fixed at 8000 hr −1 . Effects of O 2 , H 2 O (g) , and CO 2 contents and space velocity on NO decomposition are also explored. The results indicate that NO decomposition efficiencies achieved with La 0.4 Ba 0.4 Ce 0.2 SrNiO 4 and Pr 0.4 Ba 0.4 Ce 0.2 SrNiO 4 , respectively, are slightly reduced as space velocity is increased from 8000 to 20,000 hr −1 at 500°C. In addition, the activities of both catalysts (La 0.4 Ba 0.4 Ce 0.2 SrNiO 4 and Pr 0.4 Ba 0.4 Ce 0.2 SrNiO 4 ) for NO decomposition are slightly reduced in the presence of 5% O 2 , 5% CO 2 , or 5% H 2 O (g) . For durability test, with the space velocity of 8000 hr −1 and operating temperature of 600°C, high N 2 yield is maintained throughout the durability test of 60 hr, revealing the long-term stability of Pr 0.4 Ba 0.4 Ce 0.2 SrNiO 4 for NO decomposition. Overall, Pr 0.4 Ba 0.4 Ce 0.2 SrNiO 4 shows good catalytic activity for NO decomposition. Implications: Nitrous oxide (NO) not only causes adverse environmental effects such as acid rain, photochemical smog, and deterioration of visibility and water quality, but also harms human lungs and respiratory system. Pervoskite-type catalysts, including La 0.7 Ce 0.3 SrNiO 4 , La 0.4 Ba 0.4 Ce 0.2 SrNiO 4 , and Pr 0.4 Ba 0.4 Ce 0.2 SrNiO 4 , are applied for direct NO decomposition. The results show that NO decomposition can be enhanced as La 0.7 Ce 0.3 SrNiO 4 is substituted with Ba and/or Pr. At 600°C, NO decomposition efficiencies achieved with La 0.4 Ba 0.4 Ce 0.2 SrNiO 4 and Pr 0.4 Ba 0.4 Ce 0.2 SrNiO 4 reach 100%, demonstrating high activity and good potential for direct NO decomposition. Effects of O 2 , H 2 O (g) , and CO 2 contents on catalytic activities are also evaluated and discussed. PAPER HISTORY

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Decomposition of nitric oxide over perovskite oxide catalysts: effect of CO2, H2O and CH4

Cited by 78 publications

References 22 publications

ChemInform Abstract: Highly Effective Direct Decomposition of Nitric Oxide by Microwave Catalysis over BaMeO₃ (Me: Mn, Co, Fe) Mixed Oxides at Low Temperature under Excess Oxygen.

ChemInform Abstract: Highly Effective Direct Decomposition of Nitric Oxide by Microwave Catalysis over BaMeO₃ (Me: Mn, Co, Fe) Mixed Oxides at Low Temperature under Excess Oxygen.

Bench-Scale Experimental Study on the Effect of the Fluidized Bed Combustion Off-Gas Composition on the Reduction of Nitrous Oxide by Propane over an Fe-Zeolite Monolith

Enhancement of nitric oxide decomposition efficiency achieved with lanthanum-based perovskite-type catalyst

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Decomposition of nitric oxide over perovskite oxide catalysts: effect of CO2, H2O and CH4

Cited by 78 publications

References 22 publications

ChemInform Abstract: Highly Effective Direct Decomposition of Nitric Oxide by Microwave Catalysis over BaMeO3 (Me: Mn, Co, Fe) Mixed Oxides at Low Temperature under Excess Oxygen.

ChemInform Abstract: Highly Effective Direct Decomposition of Nitric Oxide by Microwave Catalysis over BaMeO3 (Me: Mn, Co, Fe) Mixed Oxides at Low Temperature under Excess Oxygen.

Bench-Scale Experimental Study on the Effect of the Fluidized Bed Combustion Off-Gas Composition on the Reduction of Nitrous Oxide by Propane over an Fe-Zeolite Monolith

Enhancement of nitric oxide decomposition efficiency achieved with lanthanum-based perovskite-type catalyst

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Product

Resources

About

ChemInform Abstract: Highly Effective Direct Decomposition of Nitric Oxide by Microwave Catalysis over BaMeO₃ (Me: Mn, Co, Fe) Mixed Oxides at Low Temperature under Excess Oxygen.

ChemInform Abstract: Highly Effective Direct Decomposition of Nitric Oxide by Microwave Catalysis over BaMeO₃ (Me: Mn, Co, Fe) Mixed Oxides at Low Temperature under Excess Oxygen.