Feasibility Study for Copper/Zirconium Oxides as Oxygen Carrier in Chemical Looping Air Separation (CLAS)

2013 ◽  
Vol 683 ◽  
pp. 479-483 ◽  
Author(s):  
Kun Wang ◽  
Qing Bo Yu ◽  
Qin Qin ◽  
Jiu Chong Li
Keyword(s):  
Oxygen Carrier ◽  
Active Phase ◽  
Reaction Rates ◽  
High Reactivity ◽  
Air Separation ◽  
Chemical Looping ◽  
Oxygen Carriers ◽  
Mechanical Mixing ◽  
Zirconium Oxides ◽  
Chemical Looping Air Separation

Chemical looping air separation (CLAS) is a new and energy saving method to separate oxygen from air. In this work, oxygen carrier was prepared by mechanical mixing method using CuO as active phase and ZrO2 as binder. XRD and SEM analysis indicate that ZrO2 cannot react with CuO at high sintering temperature and oxygen carriers prepared by this method are porous. Reactivity tests of oxygen carrier were investigated in STA409PC thermogravimetric analyzer using both temperature-programmed and isothermal thermogravimetry. The results show that the copper-based oxygen carrier has the capability of releasing oxygen when the temperatures higher than 850°C in nitrogen atmosphere. The reaction rates increase greatly as the temperature increases. Moreover, the oxygen carrier can keep high reactivity after several cycles. The copper/zirconium oxides as oxygen carrier were found to be suitable for CLAS process.

Kinetics of perovskite-like oxygen carriers for chemical looping air separation

2018 ◽  
Vol 35 (3) ◽  
pp. 626-636 ◽  
Author(s):  
Limin Hou ◽  
Qingbo Yu ◽  
Tuo Wang ◽  
Kun Wang ◽  
Qin Qin ◽  
...  
Keyword(s):  
Air Separation ◽  
Chemical Looping ◽  
Oxygen Carriers ◽  
Chemical Looping Air Separation ◽  
Kinetics Of

Review of Hydrogen Production from the Steam-Iron Process by Chemical-Looping Combustion

2014 ◽  
Vol 953-954 ◽  
pp. 966-969 ◽  
Author(s):  
Long Fei Wang ◽  
Shu Zhong Wang ◽  
Ming Luo
Keyword(s):  
Hydrogen Production ◽  
Solid Fuel ◽  
Process Development ◽  
Oxygen Carrier ◽  
Energy Conversion Efficiency ◽  
High Reactivity ◽  
Future Research ◽  
Pure Hydrogen ◽  
Chemical Looping ◽  
Oxygen Carriers

Chemical looping hydrogen production (CLH) is a promising method for pure hydrogen production, which not only can improve energy conversion efficiency and reduce environmental pollution, but also can separate carbon dioxide. This paper try to review the present chemical looping hydrogen process development on the screening of oxygen carrier particles of gaseous fuel and solid fuel, the design of proper reactors, and the system simulation. The design of solid fuel CLH system and the development of oxygen carriers with high reactivity and abrasion resistance for solid fuel at high temperature and pressure will be future research focuses.

scholarly journals Comparison of oxygen carriers for chemical-looping combustion

2006 ◽  
Vol 10 (3) ◽  
pp. 93-107 ◽  
Author(s):  
Marcus Johansson ◽  
Tobias Mattisson ◽  
Anders Lyngfelt
Keyword(s):  
Fossil Fuels ◽  
Oxygen Carrier ◽  
High Reactivity ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Oxygen Carriers ◽  
Reducing Conditions ◽  
Different Temperatures ◽  
Combustion Technology ◽  
Separation Of Co2

Chemical-looping combustion is a combustion technology with inherent separation of the greenhouse gas CO2. This technique involves combustion of fossil fuels by means of an oxygen carrier which transfers oxygen from the air to the fuel. In this manner a decrease in efficiency is avoided for the energy demanding separation of CO2 from the rest of the flue gases. Results from fifty oxygen carriers based on iron-, manganese- and nickel oxides on different inert materials are compared. The particles were prepared using freeze granulation, sintered at different temperatures and sieved to a size 125-180 mm. To simulate the environment the particles would be exposed to in a chemical-looping combustor, reactivity tests under alternating oxidizing and reducing conditions were performed in a laboratory fluidized bed-reactor of quartz. Reduction was performed in 50% CH4/50% H2O while the oxidation was carried out in 5% O2 in nitrogen. In general nickel particles are the most reactive, followed by manganese. Iron particles are harder but have a lower reactivity. An increase in sintering temperatures normally leads to an increase in strength and decrease in reactivity. Several particles investigated display a combination of high reactivity and strength as well as good fluidization behavior, and are feasible for use as oxygen carriers in chemical-looping combustion.

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