Effect of tellurium addition to supported Mo-V-O catalysts for the ammoxidation of propane to acrylonitrile

✍ Scribed by M. Olga Guerrero-Pérez; M.C. Herrera; I. Malpartida; M.A. Larrubia; L.J. Alemany

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 442 KB
• Volume: 133-135
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/j.cattod.2007.12.101

✦ Synopsis

The effect of Te addition over Mo-V-O catalysts supported on alumina is discussed for the ammoxidation of propane to acrylonitrile. Catalysts were characterized before and after catalytic reaction by XPS, XRD, UV-vis and in situ Raman spectroscopies. The absence of Te in catalysts formulation and the presence of a high amount of vanadium induce the presence of V 5+ species and the formation of V 2 O 5 oxide; associated with a decrease in acrylonitrile selectivity. The presence of heteropolyacids-type structures, such as Al-Mo-V-O or Al-Mo-O, promotes a decreasing of the selectivity to acrylonitrile. The characterization results reveal that the surface of Mo-V-Te-O catalysts is further different from the binary counterparts, due to the presence of stabilized and reduced structures dispersed on the support. The Te incorporation to supported Mo-V catalysts conduces to a better performance during propane ammoxidation.