DeNOx performance of Ag/Al2O3 catalyst using simulated diesel fuel–ethanol mixture as reductant

Kim, Mun Kyu; Kim, Pyung Soon; Baik, Joon Hyun; Nam, In−Sik; Cho, Byong K.; Oh, Se H.

doi:10.1016/j.apcatb.2011.03.017

Cited by 72 publications

(67 citation statements)

References 43 publications

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“…The role of each silver site in Ag/Al2O3 catalyst is much discussed topic leading to several articles [10][11][12][13], it is generally accepted that metallic silver has an oxidizing function and is thus responsible for activation of HC and NOx. Small silver clusters and oxidized silver have been proposed to activate the NOx reduction activity by partially oxidizing the reductant and promoting surface nitrate formation.…”

Section: Introductionmentioning

confidence: 99%

Studies on H2-Assisted Liquefied Petroleum Gas Reduction of NO over Ag/Al2O3 Catalyst

Yadav

Thakur

et al. 2017

Bull. Chem. React. Eng. Catal.

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Hydrocarbon-Selective catalytic reduction (HC-SCR) is one of the potential methods to remove NOx emissions from diesel engine, lean burn petrol engines and natural gas engines exhaust. Ag/Al2O3 is a good catalyst for HC-SCR of NOx under lean-burn conditions. Further, addition of small amount of H2 is effective for enhancing HC-SCR activity. This effect is unique to silver and to specific Ag/support combinations, namely, Ag/γ-Al2O3. Various HC reductants, such as: octane, decane, dodecane and propane, have been reported in the literatures. Only a single study on LPG as a reductant over Cu-ZSM catalyst was reported. There was no work reported on H2 assisted LPG over Ag/Al2O3 catalyst. Thus, this gap in the literature is filled with the present investigation of NO reduction over 2 wt.% Ag/Al2O3 catalyst using LPG reductant. The fresh and used catalyst was characterized by various techniques like low temperature N2-adsorption, XRD, XPS and SEM. There was practically no change in the characteristics of the fresh and used catalyst. Two different reductants of CO and LPG were compared for SCR of NO over the catalyst without and with H2-assisted. The experiments were performed in a fixed bed tubular flow reactor under the following conditions: 100mg catalyst; 0.13% NO, 2.5% LPG/CO, 1% H2, 10% O2, rest Ar; total flow rate 60 mL/min; temperature ambient 400 o C and pressure 1 atm. Around 100% conversion of NO was achieved using LPG reductant. Light off temperature of NO reduction significantly reduced by H2assisted LPG reductant. The maximum conversion of NO with CO was limited to 35.15% at temperature of 224 o C and above. Whereas, 97.79 % NO conversion was achieved at 365 o C with LPG reductant. While, the maximum conversions with H2-LPG and H2-CO reductants were 100 and 99.46% at 117 and 220 o C, respectively. Therefore, H2-LPG-SCR of NOx over 2 wt.% Ag/Al2O3 catalyst system can be used to get 100% reduction at low temperature.

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Section: Introductionmentioning

confidence: 99%

Studies on H2-Assisted Liquefied Petroleum Gas Reduction of NO over Ag/Al2O3 Catalyst

Yadav

Thakur

et al. 2017

Bull. Chem. React. Eng. Catal.

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“…The Cu-ZSM5 catalyst was prepared by the wet ion exchange method at room temperature using 0.01 M of (CH 3 COO) 2 CuÁH 2 O (Aldrich) with 15 g of ZSM5 (Tosoh, HSZ-830NHA) [17]. All catalysts prepared in the present study were oven-dried overnight at 110°C and calcined in a muffle furnace at 550°C for 5 h.…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…Ag/Al 2 O 3 catalysts were prepared by the incipient wetness method for impregnating Ag on c-Al 2 O 3 (CATALOX SBa-200, Sasol) with AgNO 3 (Kojima) aqueous solution [17]. The Cu-ZSM5 catalyst was prepared by the wet ion exchange method at room temperature using 0.01 M of (CH 3 COO) 2 CuÁH 2 O (Aldrich) with 15 g of ZSM5 (Tosoh, HSZ-830NHA) [17].…”

Section: Catalyst Preparationmentioning

confidence: 99%

Autocatalytic synergism observed during lean-NO reduction with a bifunctional reductant over Ag/Al2O3 catalyst

Kim

Cho

et al. 2012

Journal of Catalysis

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“…The silver-based adsorbents have been successfully applied to the treatment of exhausted gases and pollutants in environment due to its higher specific surface area and the role of silver ion loaded on adsorbents [16][17][18]. The mechanism of silver-loaded adsorbents trapping iodine has been reported for a long time [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of gaseous radioactive iodine by Ag/13X zeolite at high temperatures

Cheng

Yang

et al. 2014

J Radioanal Nucl Chem

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Ag/13X adsorbents were synthesized, characterized and tested for decontamination of gaseous effluents from 131 I 2 at high temperatures. X-ray diffraction patterns showed that the Ag/13X samples maintained a stable structure after calcined at 650°C for 2 h. The decontamination factors achieved with 15 % Ag/13X and 20 % Ag/13X adsorbents for 131 I 2 were nearly close to 10 3 at 650°C. In addition, 15 % Ag/13X had a stable performance for removal of 131 I 2 at 550 and 650°C, even after calcined at 550 and 650°C for over 10 h, which might be suitable for future potential use during nuclear reactor operation or in the case of nuclear accidents.

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DeNOx performance of Ag/Al2O3 catalyst using simulated diesel fuel–ethanol mixture as reductant

Cited by 72 publications

References 43 publications

Studies on H2-Assisted Liquefied Petroleum Gas Reduction of NO over Ag/Al2O3 Catalyst

Studies on H2-Assisted Liquefied Petroleum Gas Reduction of NO over Ag/Al2O3 Catalyst

Autocatalytic synergism observed during lean-NO reduction with a bifunctional reductant over Ag/Al2O3 catalyst

Adsorption of gaseous radioactive iodine by Ag/13X zeolite at high temperatures

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