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Influence of graphite as a shaping agent of Bi molybdate powders on their mechanical, physicochemical, and catalytic properties

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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.
Keywords
SELECTIVE OXIDATION, BISMUTH MOLYBDATE, BINDER, OXYGEN, PERFORMANCE, ZEOLITE, DEHYDROGENATION, TEMPERATURE, PROPYLENE, BEHAVIOR

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Chicago
Baldovino-Medrano, Víctor G, Minh Thang Le, Isabel Van Driessche, Els Bruneel, and Eric M Gaigneaux. 2011. “Influence of Graphite as a Shaping Agent of Bi Molybdate Powders on Their Mechanical, Physicochemical, and Catalytic Properties.” Industrial & Engineering Chemistry Research 50 (9): 5467–5477.
APA
Baldovino-Medrano, Víctor G, Le, M. T., Van Driessche, I., Bruneel, E., & Gaigneaux, E. M. (2011). Influence of graphite as a shaping agent of Bi molybdate powders on their mechanical, physicochemical, and catalytic properties. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 50(9), 5467–5477.
Vancouver
1.
Baldovino-Medrano VG, Le MT, Van Driessche I, Bruneel E, Gaigneaux EM. Influence of graphite as a shaping agent of Bi molybdate powders on their mechanical, physicochemical, and catalytic properties. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH. 2011;50(9):5467–77.
MLA
Baldovino-Medrano, Víctor G, Minh Thang Le, Isabel Van Driessche, et al. “Influence of Graphite as a Shaping Agent of Bi Molybdate Powders on Their Mechanical, Physicochemical, and Catalytic Properties.” INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 50.9 (2011): 5467–5477. Print.
@article{1254134,
  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.},
  author       = {Baldovino-Medrano, Víctor G and Le, Minh Thang and Van Driessche, Isabel and Bruneel, Els and Gaigneaux, Eric M},
  issn         = {0888-5885},
  journal      = {INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH},
  keywords     = {SELECTIVE OXIDATION,BISMUTH MOLYBDATE,BINDER,OXYGEN,PERFORMANCE,ZEOLITE,DEHYDROGENATION,TEMPERATURE,PROPYLENE,BEHAVIOR},
  language     = {eng},
  number       = {9},
  pages        = {5467--5477},
  title        = {Influence of graphite as a shaping agent of Bi molybdate powders on their mechanical, physicochemical, and catalytic properties},
  url          = {http://dx.doi.org/10.1021/ie102473h},
  volume       = {50},
  year         = {2011},
}

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