CFD simulations, experimental validation and parametric studies for the catalytic reduction of NO by hydrogen in a fixed bed reactor

RSC Advances ◽  
2016 ◽  
Vol 6 (92) ◽  
pp. 89259-89273 ◽  
Author(s):  
Maria Mihet ◽  
Vasile-Mircea Cristea ◽  
Paul-Serban Agachi ◽  
Ana-Maria Cormos ◽  
Mihaela D. Lazar
Keyword(s):  
Experimental Validation ◽  
No Reduction ◽  
Catalytic Reduction ◽  
Fixed Bed ◽  
Reduction Process ◽  
Fixed Bed Reactor ◽  
Catalytic Reactor ◽  
Cfd Simulations ◽  
Reduction Of No ◽  
Parametric Studies

CFD simulations and parametric studies of the NO reduction process in a fixed bed catalytic reactor.

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) 

Mechanistic insight into the influence of O2 on N2O formation in the selective catalytic reduction of NO with NH3 over Pd/CeO2 catalyst

2021 ◽  
Author(s):  
Liping Sheng ◽  
Songda Li ◽  
Zhaoxia Ma ◽  
Fei Wang ◽  
Hu He ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
No Reduction ◽  
Catalytic Reduction ◽  
Temperature Dependent ◽  
N2o Formation ◽  
Reduction Of No ◽  
Mechanistic Insight ◽  
Insight Into

O2 greatly affected the pathway for NO reduction over the Pd/CeO2 catalyst and resulted in a temperature-dependent NH3-SCR performance and formation of N2O.

Investigation of radial heat transfer in a fixed-bed reactor: CFD simulations and profile measurements

2017 ◽  
Vol 317 ◽  
pp. 204-214 ◽  
Author(s):  
Ying Dong ◽  
Bahne Sosna ◽  
Oliver Korup ◽  
Frank Rosowski ◽  
Raimund Horn
Keyword(s):  
Heat Transfer ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Cfd Simulations ◽  
Radial Heat

scholarly journals Effect of Temperature on Plasma-Assisted Catalytic Cracking of Palm Oil into Biofuels

2020 ◽  
Vol 9 (1) ◽  
pp. 107-112 ◽  
Author(s):  
I. Istadi ◽  
Teguh Riyanto ◽  
Luqman Buchori ◽  
Didi Dwi Anggoro ◽  
Roni Ade Saputra ◽  
...  
Keyword(s):  
Palm Oil ◽  
Catalytic Cracking ◽  
Plasma Reactor ◽  
Fixed Bed ◽  
Liquid Product ◽  
Fixed Bed Reactor ◽  
Effect Of Temperature ◽  
Catalytic Reactor ◽  
Catalytic Role ◽  
Reactor Temperature

Plasma-assisted catalytic cracking is an attractive method for producing biofuels from vegetable oil. This paper studied the effect of reactor temperature on the performance of plasma-assisted catalytic cracking of palm oil into biofuels. The cracking process was conducted in a Dielectric Barrier Discharge (DBD)-type plasma reactor with the presence of spent RFCC catalyst. The reactor temperature was varied at 400, 450, and 500 ºC. The liquid fuel product was analyzed using a gas chromatography-mass spectrometry (GC-MS) to determine the compositions. Result showed that the presenceof plasma and catalytic role can enhance the reactor performance so that the selectivity of the short-chain hydrocarbon produced increases. The selectivity of gasoline, kerosene, and diesel range fuels over the plasma-catalytic reactor were 16.43%, 52.74% and 21.25%, respectively, while the selectivity of gasoline, kerosene and diesel range fuels over a conventional fixed bed reactor was 12.07%, 39.07%, and 45.11%, respectively. The increasing reactor temperature led to enhanced catalytic role of cracking reaction,particularly directing the reaction to the shorter hydrocarbon range. The reactor temperature dependence on the liquid product components distribution over the plasma-catalytic reactor was also studied. The aromatic and oxygenated compounds increased with the reactor temperature.©2020. CBIORE-IJRED. All rights reserved

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.

Study on NO Emission during Co-Combustion of PVC and Biomass

2011 ◽  
Vol 347-353 ◽  
pp. 2423-2427
Author(s):  
Yan Fen Liao ◽  
Guang Yang ◽  
Xiao Qian Ma
Keyword(s):  
No Reduction ◽  
Combustion Process ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Rice Hull ◽  
No Emission ◽  
Experiment Data ◽  
Main Production ◽  
Reducing Substances ◽  
Good Agreement

In this work, some combustion experiments on PVC, rice hull, and their mixture were carried out in a fixed-bed reactor to obtain the influence of temperature, oxygen concentrations on the emission of NO. The NO emission during the co-combustion of PVC and rice hull had the same tendency as the rice hull combustion had, and it increased slowly along with the rising of temperature and oxygen concentration. The experiment results also indicate the co-combustion leaded to lower NO concentration, and it was considered that some reducing substances existed in co-combustion process leaded to a certain reduction in NO emission. The FactSage and Chemkin simulation results have a good agreement with the experiment data, and reveal that the main production reactions are: NO2+ONO+O2, NO2+HNO+OH. In addition, large amounts of volatile released by PVC in co-combustion process formed strong reducing atmospheres, which acted the major roles in the NO reduction.

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