Adsorption Thermodynamics Study on CCl2F2 over Solid Base Na2O/ZrO2

2013 ◽  
Vol 457-458 ◽  
pp. 112-115
Author(s):  
Tian Cheng Liu ◽  
Yu Jiao Guo ◽  
Guang Yang Tang ◽  
Ming Long Yuan ◽  
Ping Ning
Keyword(s):  
Water Vapor ◽  
Fixed Bed ◽  
Adsorption Heat ◽  
Fixed Bed Reactor ◽  
Solid Base ◽  
Adsorption Thermodynamics ◽  
Catalytic Hydrolysis ◽  
Chemical Adsorption ◽  
Freundlich Model

Catalytic hydrolysis decomposition of dichlorodifluoromethane (CCl2F2) in the presence of water vapor and oxygen was studied over solid base Na2O/ZrO2 using a fixed-bed reactor. The CCl2F2 adsorption was multilayer chemical adsorption and its process was corresponding with Freundlich model. Its adsorption heat was from 43.74 to 76.31 KJ.mol-1, and the CCl2F2 adsorption over solid base Na2O/ZrO2 was exothermic and chemical.

Thermodynamics Study on Catalytic Hydrolysis of CCl2F2 over Solid Acid MoO3/ZrO2

2013 ◽  
Vol 726-731 ◽  
pp. 535-538
Author(s):  
Tian Cheng Liu ◽  
Yu Jiao Guo ◽  
Ping Ning ◽  
Guang Yang Tang ◽  
Ming Long Yuan
Keyword(s):  
Water Vapor ◽  
Solid Acid ◽  
Exothermic Reaction ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Catalytic Hydrolysis ◽  
Chemical Adsorption ◽  
Freundlich Model ◽  
Hydrolysis Of

Catalytic hydrolysis decomposition of dichlorodifluoromethane (CCl2F2) in the presence of water vapor and oxygen was studied over solid acid MoO3/ZrO2 using a fixed-bed reactor. The CCl2F2 adsorption was multilayer chemical adsorption and its process was corresponding with Freundlich model. Its heat was from 56.3 to 73.2 KJ.mol-1, and it was exothermic reaction and chemical adsorption.

Catalytic Hydrolysis of CCl2F2 over Solid Base CaO/ZrO2

2013 ◽  
Vol 652-654 ◽  
pp. 1533-1538
Author(s):  
Tian Cheng Liu ◽  
Ping Ning ◽  
Hong Bin Wang ◽  
Jun Ming Guo
Keyword(s):  
Water Vapor ◽  
Fixed Bed ◽  
Catalyst Preparation ◽  
Fixed Bed Reactor ◽  
Solid Base ◽  
Catalytic Hydrolysis ◽  
High Concentration ◽  
Zro2 Content ◽  
Preparation Conditions ◽  
Hydrolysis Of

Catalytic hydrolysis decomposition of dichlorodifluoromethane (CCl2F2) in the presence of water vapor and oxygen was studied over a series of solid base that have different ZrO2 content using a fixed-bed reactor. CO2 and CClF3 were the main-products and no CO was detected as by-product. The decomposition activity depended on the calcination temperature and the Zr:Ca. Calcined at 650 °C and Zr:Ca=1:0.35 were the best catalyst preparation conditions. Adopting low concentration of oxygen and CCl2F2 and high concentration of water vapor is preferable to the achievement of high conversion of CCl2F2 and selectivity for CO2. The catalytic activity of CaO/ZrO2 remained steady for 20 h on stream.

Catalytic Decomposition of CCl2F2 over Solid Base Na2O/ZrO2

2013 ◽  
Vol 634-638 ◽  
pp. 494-499
Author(s):  
Tian Cheng Liu ◽  
Ping Ning ◽  
Hong Bin Wang ◽  
Lin Zhuan Ma ◽  
Bin Li
Keyword(s):  
Catalytic Activity ◽  
Water Vapor ◽  
Fixed Bed ◽  
Catalytic Decomposition ◽  
Catalyst Preparation ◽  
Fixed Bed Reactor ◽  
Solid Base ◽  
High Concentration ◽  
Zro2 Content ◽  
Preparation Conditions

Catalytic decomposition of dichlorodifluoromethane (CCl2F2) in the presence of water vapor and oxygen was studied over a series of solid base that have different ZrO2 content using a fixed-bed reactor. CO2 and CClF3 were the main-products and no CO was detected as by-product. The decomposition activity depended on the calcination temperature and the Zr:Na. Calcined at 600 °C and Zr:Na=1:0.35 were the best catalyst preparation conditions. Adopting low concentration of oxygen and CCl2F2 and high concentration of water vapor is preferable to the achievement of high conversion of CCl2F2 and selectivity for CO2. The catalytic activity of Na2O/ZrO2 remained steady for 120 h on stream.

Kinetics Study on Catalytic Hydrolysis of CCl2F2 over Solid Acid MoO3/ZrO2

2013 ◽  
Vol 750-752 ◽  
pp. 1283-1286
Author(s):  
Tian Cheng Liu ◽  
Yu Jiao Guo ◽  
Ping Ning ◽  
Si Ping Ji ◽  
Bin Li ◽  
...  
Keyword(s):  
Water Vapor ◽  
Solid Acid ◽  
Arrhenius Equation ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Kinetics Study ◽  
Catalytic Hydrolysis ◽  
Reaction Energy ◽  
Velocity Equation ◽  
Hydrolysis Of

Catalytic hydrolysis decomposition of dichlorodifluoromethane (CCl2F2) in the presence of water vapor and oxygen was studied over solid acid MoO3/ZrO2 using a fixed-bed reactor. The adsorption velocity equation was calculated by Bangham Equation. Reaction energy was determined by Arrhenius Equation and it was 123.12 KJ.mol-1.

Modeling of Low-Temperature Reduction of Metal Oxide in Hydrogen Treatment System for Severe Accidents in Nuclear Power Plants

2020 ◽  
Author(s):  
Kotaro Nakamura ◽  
Masashi Tanabe ◽  
Satoru Abe ◽  
Takashi Mawatari ◽  
Takao Nakagaki
Keyword(s):  
Water Vapor ◽  
Metal Oxide ◽  
Nuclear Power ◽  
Elevated Temperatures ◽  
Fixed Bed ◽  
Reaction Rates ◽  
Numerical Calculations ◽  
Treatment System ◽  
Fixed Bed Reactor ◽  
Hydrogen Treatment

Abstract At the Fukushima Daiichi nuclear power plant, zirconium in the fuel rod cladding reacted with water vapor at elevated temperatures due to a loss of cooling water, resulting in the production of a large amount of hydrogen. This hydrogen leaked from the reactor vessel and accumulated in the top of reactor building, eventually leading to an explosion. A hydrogen treatment system that re-oxidizes hydrogen to water vapor is one of the effective methods to prevent such an explosion. A prominent re-oxidation method is via a fixed bed reactor packed with metal oxide pellets. The advantages of this method are its relatively fast oxidation rate without external oxygen/air injection. In this study, experiments and complementary numerical calculations were performed on the hydrogen re-oxidation reaction by metal oxides. The oxidation of hydrogen by copper oxide is modeled by 5 interacting, elementary reactions consisting of 6 chemical species. Experiments were performed using two packed bed set-ups, with measurement of inlet/outlet gas composition and pre/post-analysis of solid composition used to determine constants of the individual reaction rates for numerical calculations. From these reaction constants, the temporal behavior of the outlet gas was predicted.

Kinetics of the Transesterification Reaction Catalyzed by Solid Base in a Fixed-Bed Reactor

2010 ◽  
Vol 24 (11) ◽  
pp. 5829-5833 ◽  
Author(s):  
Yang Xiao ◽  
Lijing Gao ◽  
Guomin Xiao ◽  
Jianhua Lv
Keyword(s):  
Fixed Bed ◽  
Transesterification Reaction ◽  
Fixed Bed Reactor ◽  
Solid Base ◽  
Kinetics Of

The Study on the Effect of Water Vapor for the Decarbonization Capacity of CaO

2012 ◽  
Vol 610-613 ◽  
pp. 2149-2152
Author(s):  
Ri Guang Wei ◽  
Jian Mei ◽  
Jian Qiang Gao ◽  
Hong Wei Chen ◽  
Chun Bo Wang
Keyword(s):  
Water Vapor ◽  
Calcination Temperature ◽  
Conversion Rate ◽  
Fixed Bed ◽  
Water Vapor Content ◽  
Fixed Bed Reactor ◽  
Effect Of Water ◽  
Reaction Atmosphere

In order to find the trends of carbonation conversion rate X when the carbonated atmosphere contains water vapor, experiments were carried out by the homemade calcination/carbonation fixed-bed reactor, in which water vapor could be added in the reaction atmosphere. By experiments in different conditions, the results have showed that: with the increase of the water vapor content X was improved significantly, and the exaltation was also reflected in the cycles; when the carbonation temperature was low water vapor on the absorbent performance will show a greater improvement; calcination temperature also has an affect on X, when the calcination temperature was higher, the effect of water vapor was more obvious.

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