Victor Baldovino-Medrano - Influence of Graphite as a Shaping Agent of Bi Molybdate Powders on Their Mechanical, Physicochemical, and Catalytic Properties

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  Publication Details (including relevant citation   information):

  Ind. Eng. Chem.   Res., 2011, 50 (9), pp   5467–5477

  Publication Date (Web): March 25, 2011   (Article)

  DOI: 10.1021/ie102473h

  Abstract:

  The influence of using graphite (G) as a shaping agent for   bismuth molybdate (BiMo) catalysts was analyzed. Shaping was done   by tableting, with addition of different loadings of graphite (0,   0.5, 1, 3, 5, 7, and 10 wt %). The use of graphite during the   pressing of bismuth molybdate powders eases tableting because of   the lubricating properties of the former. Furthermore, the   compressive strength of BiMo-G tablets is higher than that of   pure BiMo. Concerning the physicochemical properties of BiMo-G,   XRD and XPS showed that graphite changes neither the relative   distribution of the crystallographic phases of bismuth molybdate   nor the oxidation state of bismuth and molybdenum in the tableted   powders. Consequently, the shaped BiMo-G catalysts displayed   similar, or slightly better, performances in the selective   oxidation of propylene to acrolein. TGA analysis of samples of   BiMo-G confirmed the thermal stability of the catalysts under   oxidative conditions. Graphite was observed to experience   crystallization into the hexagonal 2H phase during the catalytic   tests. The results reported herein demonstrate that graphite is   an effective shaping agent for bismuth molybdate powders.

  Address (URL): http://pubs.acs.org/doi/abs/10.1021/ie102473h?prevSearch=%255BContrib%253A%2Bbal dovino-medrano%255D&searchHistoryKey=

 

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