Catalytic Hydrolysis of CCl2F2 over Solid Base CaO/ZrO2

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.

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Catalytic Decomposition of CCl2F2 over Solid Base Na2O/ZrO2

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.634-638.494 ◽

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.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.726-731.535 ◽

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.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.750-752.1283 ◽

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.

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Adsorption Thermodynamics Study on CCl2F2 over Solid Base Na2O/ZrO2

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.457-458.112 ◽

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.

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Catalytic hydrolysis of urea from wastewater using different aluminas by a fixed bed reactor

Environmental Science and Pollution Research ◽

10.1007/s11356-014-3189-9 ◽

2014 ◽

Vol 21 (21) ◽

pp. 12563-12568 ◽

Cited By ~ 4

Author(s):

Shuguang Shen ◽

Meina Li ◽

Binbin Li ◽

Zhijun Zhao

Keyword(s):

Fixed Bed ◽

Fixed Bed Reactor ◽

Catalytic Hydrolysis ◽

Hydrolysis Of ◽

Hydrolysis Of Urea

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Catalytic hydrolysis of sodium borohydride in an auto-thermal fixed-bed reactor

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2005.07.008 ◽

2006 ◽

Vol 31 (7) ◽

pp. 961-965 ◽

Cited By ~ 33

Author(s):

Q ZHANG ◽

G SMITH ◽

Y WU ◽

R MOHRING

Keyword(s):

Sodium Borohydride ◽

Fixed Bed ◽

Fixed Bed Reactor ◽

Catalytic Hydrolysis ◽

Hydrolysis Of

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

Volume 3: Student Paper Competition; Thermal-Hydraulics; Verification and Validation ◽

10.1115/icone2020-16450 ◽

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.

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Influence of Preparation Conditions of the Solid Base Catalyst on the Performance of Synthesizing Polyglycerol

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.549.109 ◽

2012 ◽

Vol 549 ◽

pp. 109-112

Author(s):

Jia Wei Qu ◽

Min Wei Wang ◽

Ren Lang Wang

Keyword(s):

Reaction Time ◽

Catalyst Preparation ◽

Solid Base ◽

Polymerization Degree ◽

Base Catalyst ◽

Solid Base Catalyst ◽

Solid Base Catalysts ◽

Base Catalysts ◽

Preparation Conditions ◽

Catalyst Type

Different solid base catalysts used for the polymerization of glycerol were prepared by impregnation. Catalyst type and the preparation conditions were optimized on the base of polymerization degree. Results showed: the best catalyst was KF/Al2O3, and optimal condition for catalyst preparation was as follows: loading of 40% KF, calcinations temperature 600°C. The polymerization degree of 5.92 was obtained under the following reaction condition: the amount of catalyst 11.62,reaction temperature 250°C, reaction time 4 h.

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