Efficient catalytic decomposition of CO2 to CO and O-2 over Pd/mixed-conducting oxide catalyst in an oxygen-permeable membrane reactor
ABSTRACT The thermal decomposition of CO2 to CO and O2 is a potential route for the consumption and utilization of CO2. However, this reaction is limited by both the thermodynamic equilibrium and the kinetic barrier. In this study, we reported an innovative catalytic process to decompose CO2 in an oxygen-permeation membrane reactor packed with a mixed-conducting oxide supported noble metal catalyst, or Pd/SrCo0.4Fe0.5Zr0.1O3-delta (Pd/ SCFZ), which is of high activity in the decomposition of CO2 into CO and O2. Pd/SCFZ catalyst was prepared by incipient wetness impregnation of the SCFZ powders with an aqueous solution of PdCl2, and the CO2 sorption/desorption property was examined by in situ Fourier transform infrared spectroscopy and temperature-programmed desorption-mass spectrometry technologies. It was shown that there appeared a typical of bridged carbonyls (Pd-CO) on the surface of the Pd/SCFZ catalyst formed after CO2 decomposition. Both CO2 and CO could be detected in the species desorbed from Pd/SCFZ catalyst, which implied that the Pd/SCFZ catalyst could effectively activate the CO2 molecule. During the catalytic process, furthermore, the activity of the Pd/SCFZ catalyst can self-regenerate by removing the produced lattice oxygen through the dense oxygen-permeable ceramic membrane. At 900 degrees C, this catalytic process attains 100% of CO formation selectivity at 15.8% of CO2 conversions.
SourceAvailable from: Abbas Aghaeinejad MeybodiMembrane Reactors for Energy Applications and Basic Chemical Production, Edited by Basi l e & Di Paol a & Hai & Pi emonte, 01/2015: chapter Membrane reactors for the decomposition of water, nitrogen oxides, and carbon dioxide, Chapter 7; Elsevier.
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ABSTRACT: A gliding arc plasma reactor was designed to destruct carbon dioxide (CO2), which is a major greenhouse gas. To increase the CO2 destruction rate with a high processing gas volume, an orifice baffle for gathering the gas flow at the centre of the electrodes was installed in the gliding arc plasma reactor. The CO2 inflows with methane (CH4) and steam (H2O) improve the CO2 destruction. The parametric studies have been made of the change of CH4 addition, gas injection velocity of the centre nozzle, change of CO2 gas flow rate, and orifice baffle configuration. The produced gases were measured, and the data analysis has been achieved in determining the CO2 destruction rate, CH4 conversion rate, destruction energy efficiency, and selectivity for CO2 and H2. The highest CO2 destruction rate for each parameter has been shown as follows: the CH4/CO2 ratio is 1 as 40%, and the injection gas velocity is 69.5 m/s as 35.7%, the CO2 flow rate is 5 L/min as 42.6%, and the orifice baffle is Type 1, which had the smallest internal area, as 35.7%.Environmental Technology 12/2014; 35(23):2940-6. DOI:10.1080/09593330.2014.925979 · 1.20 Impact Factor
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ABSTRACT: Electrochemical cells and systems play a key role in a wide range of industry sectors. These devices are critical enabling technologies for renewable energy; energy management, conservation, and storage; pollution control/monitoring; and greenhouse gas reduction. A large number of electrochemical energy technologies have been developed in the past. These systems continue to be optimized in terms of cost, life time, and performance, leading to their continued expansion into existing and emerging market sectors. The more established technologies such as deep-cycle batteries and sensors are being joined by emerging technologies such as fuel cells, large format lithium-ion batteries, electrochemical reactors; ion transport membranes and supercapacitors. This growing demand (multi billion dollars) for electrochemical energy systems along with the increasing maturity of a number of technologies is having a significant effect on the global research and development effort which is increasing in both in size and depth. A number of new technologies, which will have substantial impact on the environment and the way we produce and utilize energy, are under development. This paper presents an overview of several emerging electrochemical energy technologies along with a discussion some of the key technical challenges.Frontiers in Chemistry 09/2014; 2:79. DOI:10.3389/fchem.2014.00079