Bioreactor performance and methanogenic population dynamics in a low-temperature (5–18°C) anaerobic fixed-bed reactor

2012 ◽  
Vol 104 ◽  
pp. 136-143 ◽  
Author(s):  
Dongdong Zhang ◽  
Wanbin Zhu ◽  
Can Tang ◽  
Yali Suo ◽  
Lijuan Gao ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Low Temperature ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Bioreactor Performance

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.

Denitrification Activities of Mo-V-Ti Catalysts Prepared by Dipping Method at Low Temperature

2018 ◽  
Vol 913 ◽  
pp. 900-906
Author(s):  
Dong Zhu Ma ◽  
Jian Li ◽  
Di Yin ◽  
Yuan Huang ◽  
Rui Min Wang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Conversion Efficiency ◽  
Flue Gas ◽  
Catalytic Reduction ◽  
Fixed Bed ◽  
Space Velocity ◽  
Fixed Bed Reactor ◽  
Optimum Ratio ◽  
Denitrification Activity ◽  
Gas Space

Mo-V-Ti catalysts of low temperature denitrification were prepared by dipping method. In order to study the activity of selective catalytic reduction, the catalyst was placed in a fixed bed reactor. Industrial flue gas was simulated with cylinder gas. The experimental condition is NO: 500ppm, NH3:500ppm, O2:8%, SO2:100ppm, N2: equilibrium gas, space velocity: 36000h-1. Results indicate that the catalyst prepared by dipping method had good denitrification activity and sulfur resistance at low temperature. The optimum ratio of catalyst was 3V2O5-6MoO3-91TiO2 (wt %). The conversion efficiency of NO was 80~93%, and the conversion efficiency of SO2 was less than 1% at 180~260 °C.

Population dynamics in an aerobic submerged fixed bed reactor (ASFBR) process

2002 ◽  
Vol 46 (1-2) ◽  
pp. 257-260 ◽  
Author(s):  
I. Lorda-de-los-Ríos ◽  
E. Bécares-Mantecón ◽  
I. Tejero-Monzón
Keyword(s):  
Population Dynamics ◽  
Oxygen Concentration ◽  
Fixed Bed ◽  
High Load ◽  
Fixed Bed Reactor ◽  
Synthetic Wastewater ◽  
Organic Load ◽  
Experimental Conditions ◽  
Low Load ◽  
Aeration Conditions

In this study, an aerobic submerged fixed bed reactor's (ASFBR) population dynamics has been studied in order to know its behavior in different conditions of organic load and oxygen concentration. The reactor was fed with synthetic wastewater. Tested variables and applied values were: 1) Variations in organic load (OL): 16–65 g COD/m2/d. 2) Variations in influent's COD concentration: 40–400 g COD/m3. 3) Variations in specific air flow (SAF): 15–127 m3air/kgCOD. Biofilm samples were taken at the top of the reactor. This study showed important variations in the composition and abundance of the microfauna depending on the experimental conditions. Variations in influent concentration had no significant effect on the abundance of the studied groups. However, differences depending on organic load and aeration conditions were observed. Organic load influenced every group studied but with different results. Sessile cilliates, metazoa and flagellates were abundant in low load, while crawling ones were in high load. Aeration intensity influenced most of the groups except Peranema and Vorticella spp. Despite obtaining good yields, not many protozoa, typical of biofilms under conventional processes, were found. Thus, a great variety of microorganisms, such as many classes of sessile and crawling cilliates, were not found. Important nitrifying activity was obtained at 20 cm depth in a bed. From this point, the heterotrophic and nitrifying populations exist but are inactive.

scholarly journals Low Temperature Dehydration of Glycerol to Acrolein in Vapor Phase with Hydrogen as Dilution: From Catalyst Screening via TPSR to Real-Time Reaction in a Fixed-Bed

Catalysts ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 43
Author(s):  
Xincheng Wang ◽  
Fenghe Zhao ◽  
Long Huang
Keyword(s):  
Low Temperature ◽  
High Selectivity ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Rapid Screening ◽  
Glycerol Conversion ◽  
Catalyst Screening ◽  
Catalyst Life ◽  
Temperature Programmed Surface Reaction ◽  
Temperature Programmed

Temperature programmed surface reaction (TPSR) was developed as a method for rapid screening of catalysts. In this study, a series of acid catalysts was screened for the low-temperature dehydration of glycerol to acrolein via TPSR. Results suggested that most catalysts show activity of glycerol conversion to acrolein at a greatly different temperature range. HY, SiO2 supported H4SiW12O40 (STA/SiO2), SO42−/ZrO2, and SO42−/TiO2 were observed to be efficient for the conversion of glycerol into acrolein at 210 °C, which was significantly lower than that generally reported (250–340 °C). Moreover, high selectivity of acrolein was gained at 85% and 86% over SiW/SiO2 and SO42−/TiO2, respectively. A new style catalyst, ZnCl2/SiO2, was also found to be highly selective to acrolein and evaluated in a conventional fixed-bed reactor. Especially, stability tests showed that the catalyst life was up to 300 h with no clear deactivation on ZnCl2/SiO2 with hydrogen as dilution.

Effect of Minerals in Coal on the Product Yield of Coal Pyrolysis and Phenols in the Low-Temperature Tar

2012 ◽  
Vol 512-515 ◽  
pp. 1129-1136 ◽  
Author(s):  
Fan Hu Zeng ◽  
De Min He ◽  
Jun Guan ◽  
Qiu Min Zhang
Keyword(s):  
Carbon Monoxide ◽  
Low Temperature ◽  
Brown Coal ◽  
Atmospheric Pressure ◽  
Fixed Bed ◽  
Product Yield ◽  
Fixed Bed Reactor ◽  
Coal Pyrolysis ◽  
Catalytic Role

Wulagai brown coal and Wulagai acid washed brown coal were used to investigate the effect of minerals in coal on the reactivity of coal pyrolysis. The experiments were carried out at atmospheric pressure in a fixed bed reactor. The results showed that minerals in brown coal affected the product yield of coal pyrolysis and phenols in the low-temperature tar. The minerals in coal played a catalytic role on the generation of carbon monoxide and ethylene, and the decomposition of tar. At the same time, they may suppress the decomposition of intermediates or the producing of final phenols during coal pyrolysis.

Denitrification Activities of Mg-Mo-V-Ti Catalysts Prepared by Dipping Method at Low Temperature

2018 ◽  
Vol 913 ◽  
pp. 893-899
Author(s):  
Dong Zhu Ma ◽  
Jian Li ◽  
Ling Zhang ◽  
Peng Guo ◽  
Zi Qiang Wen ◽  
...  
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Oxygen Content ◽  
Oxygen Concentration ◽  
Flue Gas ◽  
Catalytic Reduction ◽  
Fixed Bed ◽  
Space Velocity ◽  
Fixed Bed Reactor ◽  
Sulfur Resistance

Mg-Mo-V-Ti catalysts of low temperature denitrification were prepared by dipping method. In order to study the activity of selective catalytic reduction, the catalyst was placed in a fixed bed reactor. Industrial flue gas was simulated with cylinder gas. Results indicate that the 0.1wt% content of MgO catalyst has good performance on denitration activity and sulfur resistance. The effects of oxygen content, space velocity and reaction temperature on the activity of the 0.1MgO-6MoO3-3V2O5-TiO2 wt% catalyst were investigated. With the increase of oxygen concentration, the denitrification efficiency increases when the oxygen concentration is less than 8%. When the oxygen content is greater than 8%, the denitrification efficiency is almost the same. The denitrification efficiency decreases with the increase of space velocity. The removal efficiency of NO 0.1MgO-6MoO3-3V2O5-TiO2 wt% catalyst over increases first and then becomes stable with the increase of temperature, and the conversion efficiency of SO2 is less than or equal to 2.2% at 120~240 °C.

scholarly journals Study on Low-Temperature Catalytic Dehydrogenation Reaction of Tail Chlorine by Pd/Al2O3

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Hanhan Wang ◽  
Tingting Lu ◽  
Yuna Li ◽  
Bo Wu ◽  
Jianwei Xue ◽  
...  
Keyword(s):  
Low Temperature ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Incipient Wetness Impregnation ◽  
Catalytic Dehydrogenation ◽  
Impregnation Method ◽  
Pd Catalysts ◽  
Dehydrogenation Reaction ◽  
Loading Amount ◽  
Oxygen Reaction

The catalytic dehydrogenation reaction of tail chlorine by Pd was studied using a fixed-bed reactor at low temperature from 30 to 100°C. Different catalyst supports such as SiO2 and Al2O3 were applied to prepare Pd catalysts by the incipient-wetness impregnation method. And the catalysts were characterized by XRD, FTIR, XPS, SEM, and N2 adsorption-desorption. The catalyst Pd loading on both SiO2 and Al2O3 had a catalytic effect on the dehydrogenation reaction, but the carrier Al2O3 was more superior. The hydrogen conversion and selectivity of hydrogen-oxygen reaction increased first and then decreased with Pd loading amount and temperature by using Pd/Al2O3 as catalysts, but the influence of temperature was limited when it was higher than 60°C. The hydrogen conversion was 97.38% and selectivity of hydrogen-oxygen reaction was 79% when the reaction temperature was at 60°C with 1 wt.% Pd/Al2O3.

A Novel Fe 1-xO-Based Fused Iron Catalyst for Fischer-Tropsch Synthesis with the High Olefine Selectivity

2012 ◽  
Vol 512-515 ◽  
pp. 2207-2211
Author(s):  
Hua Zhang Liu ◽  
Xia Zhen Yang ◽  
Ya Qing Cen ◽  
Hao Dong Tang
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
High Stability ◽  
Iron Catalyst ◽  
Low Cost ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Preparation Process ◽  
Fischer Tropsch ◽  
Fused Iron Catalyst

The performance and stability for FTS was studied on novel Fe1-xO-based iron catalyst (FIC) in agitated slurry reactor (ASR) and fixed bed reactor (FBR), and compared with precipitation-iron catalyst (PIC). The studied results indicate that novel Fe1-xO-based iron catalyst has the high conversion and high stability, especially, the high alkene selectivity in C2 ~ C4 products that the ratios of olefines and paraffines the more than 9 and the low cost, the preparation process and the high mechanical intensity. The catalyst can be used at FBR or ASR, and FTS at high temperature or low temperature.

Experimental Research on Catalysts of V2O5/AC and V2O5/CNTs for Low Temperature SCR Denitrification

2014 ◽  
Vol 694 ◽  
pp. 478-483 ◽  
Author(s):  
Jing Liu ◽  
Kai Zhang ◽  
Meng Si ◽  
Jing Hong Lian ◽  
Lian Sheng Liu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Experimental Research ◽  
Reaction Temperature ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Impregnation Method ◽  
No Conversion ◽  
Temperature Range ◽  
Effects Of Temperature ◽  
Low Temperature Scr

Two catalysts (V2O5/AC and V2O5/CNTs) with different loadings, prepared by impregnation method, were used to research the DeNOx activity under N2and CO2atmospheres respecitively at the temperature range from 100°C to 300°C using a fixed bed reactor. Effects of temperature, loading and support on the DeNOx activity were studied. The results show that the NO conversion of the both catalysts increases with the reaction temperature. The loading and support have significant effects on the activities. 9%V2O5/AC and 9%V2O5/CNTs yielded 80% and 66.6% NO conversion at 250°C respectively under N2atmosphere, however, they yielded 78.1% and 75.1% respectively under CO2atmosphere.

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