Effect of Chlorine on the Chemisorptive Properties and Ammonia Synthesis Activity of Alumina-Supported Ru Catalysts |
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Authors: | Bingyu Lin Rong Wang Jianxin Lin Jun Ni and Kemei Wei |
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Affiliation: | (1) National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian, 350002, People’s Republic of China |
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Abstract: | Abstract A series of Ru/Al2O3 catalysts were prepared to study the effect of the amount and the origin of residual chlorine on chemisorptive property and
the ammonia synthesis activity. The catalysts were characterized by X-ray fluorescence, CO chemisorption, transmission Electron
Microscopy, X-ray photoelectron spectroscopy, hydrogen temperature-programmed desorption, hydrogen temperature-programmed
reduction. It is found that the presence of chlorine had a limited impact on Ru particle size. Residual chlorine originated
from RuCl3 would not influence on Ru 3d5/2 binding energy, but chlorine from HCl solution significantly increased Ru 3d5/2 binding energy. Regardless of their source, the presence of chlorine severely reduced the amount of hydrogen species corresponding
to the desorption peak at medium temperature. The inhibition effect of chlorine on hydrogen adsorption was more strong for
Ru catalyst with residual chlorine from the RuCl3 precursor. With a similar amount of residual chlorine, the catalysts with chlorine originated from the RuCl3 precursor showed much lower catalytic activity than those prepared by impregnation of HCl. These results suggest that chlorine
mainly affects the catalytic properties of alumina supported Ru catalysts for ammonia synthesis by selective site blocking. |
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