Temperature-Programmed Reduction Studies of V-Ag Catalysts

✍ Scribed by Xin Ge; Hui-liang Zhang

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 247 KB
• Volume: 141
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1998.7945

✦ Synopsis

In H 2 /N 2 atmosphere, the reduction behavior of V-Ag catalysts with V/Ag atomic ratios 1/0, 9/1, 3/1, 2.16/1, 1.5/1, 1/1, and 0/1 were studied by temperature-programmed reduction (TPR), X-ray diffraction (XRD), and ultraviolet diffuse reflectance spectra (UVDRS). The results showed that the reduction processes of Ag 2 V 4 O 11 , Ag 2 V 4 O 10.84 , and Ag 1.2 V 3 O 8 are all the same while the reduction temperature was raised; they were first reduced to Ag and V 6 O 13 , then to VO 2 , and thence to V 2 O 3 subsequently. To vanadium oxides in V-Ag catalysts, the reactions with hydrogen were accelerated and the peak temperatures (T M ) of TPR were decreased explicitly due to the addition of silver element.