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

2018 ◽  
Vol 13 (2) ◽  
pp. 227 ◽  
Author(s):  
Pratichi Singh ◽  
Deepak Yadav ◽  
Pooja Thakur ◽  
Jitendra Pandey ◽  
Ram Prasad
Keyword(s):  
Low Temperature ◽  
No Reduction ◽  
Flow Reactor ◽  
Catalytic Reduction ◽  
Fixed Bed ◽  
Liquefied Petroleum Gas ◽  
Lean Burn ◽  
Reduction Of No ◽  
Al2o3 Catalyst ◽  
Scr Of Nox

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 oC 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 oC and above. Whereas, 97.79 % NO conversion was achieved at 365 oC with LPG reductant. While, the maximum conversions with H2-LPG and H2-CO reductants were 100 and 99.46% at 117 and 220 oC, respectively. Therefore, H2-LPG-SCR of NOx over 2 wt.% Ag/Al2O3 catalyst system can be used to get 100% reduction at low temperature. Copyright © 2018 BCREC Group. All rights reservedReceived: 24th June 2017; Revised: 6th October 2017; Accepted: 10th November 2017; Available online: 11st June 2018; Published regularly: 1st August 2018How to Cite: Singh, P., Yadav, D., Thakur, P., Pandey, J., Prasad, R. (2018). Studies on H2-Assisted Liquefied Petroleum Gas Reduction of NO over Ag/Al2O3 Catalyst. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (2): 227-235 (doi:10.9767/bcrec.13.2.1307.227-235) 

Preparation and Performance of Several Non-Precious Metal Oxides Catalysts for the Low Temperature SCR of NOx with NH3

2011 ◽  
Vol 356-360 ◽  
pp. 1528-1534
Author(s):  
Wei Fang Dong
Keyword(s):  
Low Temperature ◽  
Metal Oxides ◽  
Flue Gas ◽  
Precious Metal ◽  
Catalytic Reduction ◽  
Fixed Bed ◽  
Catalytic Performance ◽  
Fixed Bed Reactor ◽  
Low Temperature Scr ◽  
Scr Of Nox

A series of non-precious metal oxides catalysts were prepared for low-temperature selective catalytic reduction (SCR) of NOx with NH3 in a fixed bed reactor. The catalytic performance was evaluated by the removal efficiency of NOx and N2selectivity which were respectively detected by flue gas analyzer and flue gas chromatograph. Furthermore, the components of gas products from the above experiments were analysed with 2010 GC-MS. The results illustrated that the MnO2exhibited the highest NOx conversion to 95.46% and the highest selectivity of N2to 100% at temperature of 393K, then followed ZrO2, Al2O3and Fe2O3.

scholarly journals Insights into the promotion role of phosphorus doping on carbon as a metal-free catalyst for low-temperature selective catalytic reduction of NO with NH3

RSC Advances ◽  
2020 ◽  
Vol 10 (22) ◽  
pp. 12908-12919
Author(s):  
Weifeng Li ◽  
Shuangling Jin ◽  
Rui Zhang ◽  
Yabin Wei ◽  
Jiangcan Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
No Reduction ◽  
Catalytic Reduction ◽  
Carbon Aerogels ◽  
Phosphorus Doping ◽  
Reduction Of No ◽  
Metal Free

P species can effectively enhance the catalytic activity of carbon aerogels for NO reduction at low temperature.

Ag modified Mn–Ce/γ-Al2O3 catalyst for selective catalytic reduction of NO with NH3 at low-temperature

2015 ◽  
Vol 135 ◽  
pp. 66-72 ◽  
Author(s):  
Fan Cao ◽  
Jun Xiang ◽  
Sheng Su ◽  
Pengying Wang ◽  
Song Hu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Reduction Of No ◽  
Al2o3 Catalyst

The Effect of Iron Doping on the Performance of Mn/TiO2 Catalysts for NO Reduction with NH3 at Low Temperature

2013 ◽  
Vol 864-867 ◽  
pp. 1415-1420
Author(s):  
Jie Nan Hong ◽  
Wei Guo Pan ◽  
Rui Tang Guo ◽  
Wen Long Zhen ◽  
Yue Liang Yu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
No Reduction ◽  
Catalytic Reduction ◽  
Poor Performance ◽  
Acid Sites ◽  
Iron Doping ◽  
Reduction Of No ◽  
Catalysts For No Reduction ◽  
Redox Ability

The catalysts of Mn/TiO2, Fe/TiO2and Mn-Fe/TiO2prepared by coprecipitation method were investigated for low temperature selective catalytic reduction of NO with NH3. The catalytic activity and SO2resistance of these three catalysts were tested and the properties of the catalysts were characterized by using N2-BET, XRD, H2-TPR, NH3-TPD methods. It was found that the doping of iron reduced the catalytic activity of Mn/TiO2catalyst at low temperature and also has an adverse effect for its SO2resistance at the same time. The decrease of surface area , redox ability and surface acid sites caused by doping of iron might be the main reasons for poor performance of this catalyst.

scholarly journals Low Temperature Selective Catalytic Reduction (SCR) of NOx Emissions by Mn-doped Cu/Al2O3 Catalysts

2017 ◽  
Vol 12 (3) ◽  
pp. 415 ◽  
Author(s):  
Deepak Yadav ◽  
Ashish R. Kavaiya ◽  
Devendra Mohan ◽  
Ram Prasad
Keyword(s):  
Low Temperature ◽  
Pore Size Distribution ◽  
Pore Size ◽  
No Reduction ◽  
Catalytic Reduction ◽  
Nox Emissions ◽  
Narrow Pore Size Distribution ◽  
X Ray ◽  
Mn Doped ◽  
Scr Of Nox

The 15 mol% Cu/Al2O3 catalysts with different Mn doping (0.5, 1.0, 1.5, mol%) were prepared using PEG-300 surfactant following evaporation-induced self-assembly (EISA) method. Calcination of precursors were performed in flowing air conditions at 500 ºC. The catalysts were characterized by X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscope Energy Dispersive X-Ray (SEM-EDX), Fourier Transform Infra Red (FTIR), and N2 physisorption. The catalysts activities were evaluated for H2 assisted LPG-SCR of NO in a packed bed tubular flow reactor with 200 mg catalyst under the following conditions: 500 ppm NO, 8 % O2, 1000 ppm LPG, 1 % H2 in Ar with total flow rate of 100 mL/min. Characterization of the catalysts revealed that surface area of 45.6-50.3 m2/g, narrow pore size distribution (1-2 nm), nano-size crystallites, Cu2+ and Mn2+ phases were principal active components. Hydrogen enhanced significantly selective reduction of NO to N2 with LPG over 1.0 mol % Mn-Cu/Al2O3 giving 95.56 % NO reduction at 150 ºC. It was proposed that the synergistic interaction between H2 and LPG substantially widened the NO reduction temperature window and a considerable increase in both activity and selectivity. Negligible loss of catalyst activity was observed for the 50 h of stream on run experiment at 150 ºC. The narrow pore size distribution, thermal stability of the catalyst and optimum Mn doping ensures good dispersion of Cu and Mn over Al2O3 that improved NO reduction in H2-LPG SCR system. Copyright © 2017 BCREC Group. All rights reservedReceived: 5th January 2017; Revised: 20th May 2017; Accepted: 20th May 2017; Available online: 27th October 2017; Published regularly: December 2017How to Cite: Yadav, D., Kavaiya, A.R., Mohan, D., Prasad, R. (2017). Low Temperature Selective Catalytic Reduction (SCR) of NOx Emissions by Mn-doped Cu/Al2O3 Catalysts. Bulletin of Chemical Reaction Engineering & Catalysis, 12 (3): 415-429 (doi:10.9767/bcrec.12.3.895.415-429) 

Selective catalytic reduction of NO with NH3 over MnO2/PDOPA@CNT catalysts prepared via poly(dopamine) functionalization

2018 ◽  
Vol 42 (14) ◽  
pp. 11273-11275 ◽  
Author(s):  
Yanbing Zhang ◽  
Mingjie Ding ◽  
Chengjian Song ◽  
Yingjie Lv ◽  
Haipeng Zhao
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
No Reduction ◽  
Catalytic Reduction ◽  
Reduction Of No ◽  
First Time

MnO2/PDOPA@CNT catalysts were for the first time prepared via poly(dopamine) functionalization and applied in low-temperature NO reduction with NH3.

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