scholarly journals Experimental and Kinetic Investigation on NO Reduction by Rice Husk Char and Catalytically with CO

2020 ◽  
Vol 10 (19) ◽  
pp. 6715
Author(s):  
Nan Li ◽  
Yali Wang ◽  
Suping Cui ◽  
Xiaodong Jin
Keyword(s):  
Rice Husk ◽  
No Reduction ◽  
Fixed Bed ◽  
Energy Resource ◽  
Reduction Reaction ◽  
Direct Reaction ◽  
No Reduction By Co ◽  
Co Concentration ◽  
Reaction Orders ◽  
Biomass Char

Biomass char is accepted as an environmentally friendly energy resource, and is promising for NO removal in industrial furnaces. NO reduction with biomass char (rice husk) was investigated in a fixed-bed quartz reactor. The influence of CO concentration, reaction temperature, initial NO concentration, and char loading on the NO reduction were evaluated. The results showed that the overall NO reduction reaction was dominated by the direct reaction of NO with char without CO. Increasing CO concentration resulted in an enhanced catalytic reaction between NO and CO over the char surface and a decreased carbon consumption of char. With decreasing temperature, the influence of CO concentration on NO reduction was strengthened. Over the test temperature range, char provided a surface to catalyze the NO–CO reaction at excess CO/NO ratio. Increasing the initial NO concentration led to an increasingly significant influence on NO reduction with the enhanced CO/NO ratio. With increased char loading, the enhancement of NO reduction became unobservable for excess CO/NO ratio. Reaction orders of NO and activation energy for NO reduction by char were 0.71 and 60.21 kJ·mol−1, respectively, against 0.82 and 34.60 kJ·mol−1, respectively, for NO reduction by CO, catalyzed by char.

Simulation Investigation of NO Reduction by CO in Sintering Process

2013 ◽  
Vol 781-784 ◽  
pp. 2590-2593
Author(s):  
Hong Jing Han ◽  
Yan Guang Chen ◽  
Feng Ming Yu ◽  
Jin Lian Li ◽  
Shu Zhi Liu ◽  
...  
Keyword(s):  
Catalytic Effect ◽  
No Reduction ◽  
Fixed Bed ◽  
Reduction Reaction ◽  
Sintering Process ◽  
No Conversion ◽  
Temperature Range ◽  
No Reduction By Co ◽  
Bed Materials

Effects of CaO, MgO, Fe2O3 and sintering ores on NO reduction by CO was investigated with or without oxygen present. The NO reduction reaction was carried out in a fixed bed quartz reactor with CaO, MgO, Fe2O3 and sintering ore as bed materials under the temperature range from 600°C to 1000°C. The results showed that the order of the catalytic effect on NO reduction by CO was, CaO > sintered ores > Fe2O3 > MgO. Under the action of the sintered ores, the NO conversion was over 90% with 1.2% CO. The presence of oxygen didnt favor the NO reduction by CO.

Effect of Cement Raw Meal on the NO Reduction by Biomass Char

2020 ◽  
Vol 993 ◽  
pp. 1401-1406
Author(s):  
Nan Li ◽  
Su Ping Cui ◽  
Ya Li Wang ◽  
Xiao Yu Ma ◽  
Shi Jie Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
No Reduction ◽  
Fixed Bed ◽  
Reduction Rate ◽  
Laboratory Scale ◽  
Carbon Surface ◽  
Long Time ◽  
Negative Effect ◽  
Biomass Char ◽  
Positive Effect

The influence of cement raw meal on the NO reduction by biomass char at a high temperature of 900 °C with four O2 concentrations of 1%, 3%, 5% and 8% was investigated in a laboratory scale fixed bed quartz reactor. The results showed that the cement raw meal had certain positive effect on NO reduction by biomass char which promotes dissociation adsorption of NO with the help of CO consumption and oxygen transferred to carbon surface, however, it also shows some negative effect, and the degree depends on O2 concentration. A long-time and high NO reduction rate was obtained in the case of 1% O2 concentration.

scholarly journals Pengaruh Jenis Bahan terhadap Proses Gasifikasi Sampah Organik Menggunakan Updraft Fixed Bed Reactor

2017 ◽  
Vol 1 (2) ◽  
pp. 30 ◽  
Author(s):  
Wira Widyawidura ◽  
Maria Ratih Puspita Liestiono ◽  
Muhammad Sigit Cahyono ◽  
Agus Prasetya ◽  
Mochammad Syamsiro
Keyword(s):  
Rice Husk ◽  
Organic Waste ◽  
Fixed Bed ◽  
Energy Resource ◽  
Gas Production ◽  
Raw Material ◽  
Fixed Bed Reactor ◽  
Time Interval ◽  
Burning Time ◽  
Renewable Energy Resource

<p>Organic wastes has potential as a renewable energy resource. The waste could be converted as a gaseous fuel through gasification method. The objective of this reserach was to study the performance of gasification of various organic waste using fixed bed updraft gasifier especially in term of production of heat and stability of gas production. The raw material that used are rice husk, sawdust pellet, and wood branch. The stabilization of gas production was measurdd based on the time interval of gas could be burnt. The result shows that the kind of biomass has influenced the heating rate and stability of gas production. Sawdust pellet have the biggest burning stabilisation, that is 45 minute of burning time, compare to rice husk that have 15 minute burning time, and wood branch that have 30 minutes burning time. The main problem of gasification of organic waste was less stabilization of gas production due to low material compaction and uncontinuous mass flow.</p>

scholarly journals Electrokinetic and in situ spectroscopic investigations of CO electrochemical reduction on copper

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jing Li ◽  
Xiaoxia Chang ◽  
Haochen Zhang ◽  
Arnav S. Malkani ◽  
Mu-jeng Cheng ◽  
...  
Keyword(s):  
Mass Transport ◽  
Active Sites ◽  
Gas Diffusion ◽  
Reduction Reaction ◽  
Adsorbed Hydrogen ◽  
Diffusion Type ◽  
Proton Coupled Electron Transfer ◽  
Alkaline Electrolytes ◽  
Reaction Orders

AbstractRigorous electrokinetic results are key to understanding the reaction mechanisms in the electrochemical CO reduction reaction (CORR), however, most reported results are compromised by the CO mass transport limitation. In this work, we determined mass transport-free CORR kinetics by employing a gas-diffusion type electrode and identified dependence of catalyst surface speciation on the electrolyte pH using in-situ surface enhanced vibrational spectroscopies. Based on the measured Tafel slopes and reaction orders, we demonstrate that the formation rates of C2+ products are most likely limited by the dimerization of CO adsorbate. CH4 production is limited by the CO hydrogenation step via a proton coupled electron transfer and a chemical hydrogenation step of CO by adsorbed hydrogen atom in weakly (7 < pH < 11) and strongly (pH > 11) alkaline electrolytes, respectively. Further, CH4 and C2+ products are likely formed on distinct types of active sites.

A novel integrated rotary reactor for NO reduction by CO and air preheating: Reactor design and heat transfer modelling

2021 ◽  
Vol 190 ◽  
pp. 116815
Author(s):  
Jianjie Li ◽  
Peiliang Sun ◽  
Xingxing Cheng ◽  
Xiangdong Li ◽  
Xiaotao T. Bi ◽  
...  
Keyword(s):  
Heat Transfer ◽  
No Reduction ◽  
Reactor Design ◽  
No Reduction By Co ◽  
Transfer Modelling ◽  
Rotary Reactor

scholarly journals Gasification and Power Generation Characteristics of Rice Husk, Sawdust, and Coconut Shell Using a Fixed-Bed Downdraft Gasifier

2021 ◽  
Vol 13 (4) ◽  
pp. 2027
Author(s):  
Md. Emdadul Hoque ◽  
Fazlur Rashid ◽  
Muhammad Aziz
Keyword(s):  
Rice Husk ◽  
Fixed Bed ◽  
Cost Effective ◽  
Coconut Shell ◽  
Energy Sources ◽  
Airflow Rate ◽  
Gas Generation ◽  
Biomass Feedstocks ◽  
Downdraft Gasifier ◽  
Synthetic Gas

Synthetic gas generated from the gasification of biomass feedstocks is one of the clean and sustainable energy sources. In this work, a fixed-bed downdraft gasifier was used to perform the gasification on a lab-scale of rice husk, sawdust, and coconut shell. The aim of this work is to find and compare the synthetic gas generation characteristics and prospects of sawdust and coconut shell with rice husk. A temperature range of 650–900 °C was used to conduct gasification of these three biomass feedstocks. The feed rate of rice husk, sawdust, and coconut shell was 3–5 kg/h, while the airflow rate was 2–3 m3/h. Experimental results show that the highest generated quantity of methane (vol.%) in synthetic gas was achieved by using coconut shell than sawdust and rice husk. It also shows that hydrogen production was higher in the gasification of coconut shell than sawdust and rice husk. In addition, emission generations in coconut shell gasification are lower than rice husk although emissions of rice husk gasification are even lower than fossil fuel. Rice husk, sawdust, and coconut shell are cost-effective biomass sources in Bangladesh. Therefore, the outcomes of this paper can be used to provide clean and economic energy sources for the near future.

NH3 formation pathways from NO reduction by CO in the presence of water over Rh/Al2O3

2021 ◽  
Vol 286 ◽  
pp. 119893
Author(s):  
Chun-Jae Yoo ◽  
Andrew (Bean) Getsoian ◽  
Aditya Bhan
Keyword(s):  
No Reduction ◽  
No Reduction By Co ◽  
Nh3 Formation

scholarly journals Cover Feature: Operando Shell‐Isolated Nanoparticle‐Enhanced Raman Spectroscopy of the NO Reduction Reaction over Rhodium‐Based Catalysts (ChemPhysChem 15/2021)

ChemPhysChem ◽  
2021 ◽  
Vol 22 (15) ◽  
pp. 1545-1545
Author(s):  
Fabiane C. Ballotin ◽  
Thomas Hartman ◽  
Joris Koek ◽  
Robin G. Geitenbeek ◽  
Bert M. Weckhuysen
Keyword(s):  
Raman Spectroscopy ◽  
No Reduction ◽  
Reduction Reaction
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