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http://dx.doi.org/10.7316/KHNES.2015.26.5.423

Effect of Al Precursor Addition Time on Catalytic Characteristic of Cu/ZnO/Al2O3 Catalyst for Water Gas Shift Reaction  

BAEK, JEONG HUN (Graduate School of Energy Science and Technology, Chungnam National University)
JEONG, JEONG MIN (Graduate School of Energy Science and Technology, Chungnam National University)
PARK, JI HYE (Graduate School of Energy Science and Technology, Chungnam National University)
YI, KWANG BOK (Department of Chemical Engineering Education, Chungnam National University)
RHEE, YOUNG WOO (Graduate School of Energy Science and Technology, Chungnam National University)
Publication Information
Journal of Hydrogen and New Energy / v.26, no.5, 2015 , pp. 423-430 More about this Journal
Abstract
$Cu/ZnO/Al_2O_3$ catalysts for water gas shift (WGS) reaction were synthesized by co-precipitation method with the fixed molar ratio of Cu/Zn/Al precursors as 45/45/10. Copper and zinc precursor were added into sodium carbonate solution for precipitation and aged for 24h. During the aging period, aluminum precursor was added into the aging solution with different time gap from the precipitation starting point: 6h, 12h, and 18h. The resulting catalysts were characterized with SEM, XRD, BET surface measurement, $N_2O$ chemisorption, TPR, and $NH_3$-TPD analysis. The catalytic activity tests were carried out at a GHSV of $27,986h^{-1}$ and a temperature range of 200 to $400^{\circ}C$. The catalyst morphology and crystalline structures were not affected by aluminum precursor addition time. The Cu dispersion degree, surface area, and pore diameter depended on the aging time of Cu-Zn precipitate without the presence of $Al_2O_3$ precursor. Also, the interaction between the active substance and $Al_2O_3$ became more stronger as aging duration, with Al precursor presented in the solution, increased. Therefore, it was confirmed that aluminum precursor addition time affected the catalytic characteristics and their catalytic activities.
Keywords
Water gas shift reaction; Co-precipitation; Copper; $Cu/ZnO/Al_2O_3$ catalyst; Support;
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