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Support Chemistry
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Alumina
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Silica/Alumina
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Reactors
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Fixed Bed Reactor

 

 

General features: The catalytic particles are packed in their positions in a fixed bed reactor. It is most practical for large-scale, relatively slow reactions not involving large heat generation or consumption. The fluid moves downward through the reactor in nearly plug flow.


Reaction phases : Gas or liquid


Operation : Continuous


Particle size and shape : Pressure drop determines particle size and shape. Larger particles will produce less pressure drop, more diffusion limitations.


Heat of reaction : Moderate. Intermediate cooling or heating may be necessary for highly exothermic or endothermic reactions

Useful equation : Ergun Equation for calculating pressure drop (ΔP) over fixed bed of length L



Examples

  1. Direct oxidation of methanol to formaldehyde over ferric molybdate catalyst at 330~380 ° C, 1.2 ~ 1.5 bar, and 7000~12000 h-1 GHSV.
  2. Production of vinyl acetate over palladium/silica catalyst at 150-175 °C and about 5-10 bar.

References

  1. J.F.Le Page, Applied heterogeneous catalysis-design, manufacture, use of solid catalysts, Gulf Publishing Co., 1987.
  2. C.N.Satterfield, Heterogeneous Catalysis in industrial practice, 2nd Ed., McGraw-Hill Inc., 1991.
  3. R.J.Wijngaarden, A.Kronberg, and K.R.Westerterp, Industrial catalysis-optimizing catalysts and processes, Wiley-VCH, 1998.