Abstract
The effect of the support material on the Ag-catalyzed decomposition of acrylonitrile (AN) to form N 2 was studied for catalyst systems of Ag-ZSM-5, Ag/Al 2O 3, Ag/TiO 2, Ag/SiO 2, Ag/MgO, and Ag/ZrO 2. Ag/TiO 2 and Ag/SiO 2 exhibited high AN conversion with high N 2 selectivity. X-ray diffraction, ultraviolet–visible spectroscopy, and H 2 temperature-programmed reduction revealed that both metallic and oxidized Ag species were present on TiO 2 and SiO 2. On the basis of diffuse reflectance infrared Fourier transform spectroscopy measurements, NH 3 appeared to be formed by hydrolysis of AN, and this hydrolysis was enhanced by the presence of oxidized Ag species in the catalysts. The high AN decomposition activity was due to the presence of both oxidized and metallic Ag species, which promoted the hydrolysis of AN to form NH 3 and the subsequent oxidation of NH 3 to N 2, respectively.
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