Selective Oxidation of H2S Over SiC-Supported Iron Catalysts into Elemental Sulfur

4 Selective Oxidation of H2S Over SiC-Supported Iron Catalysts into Elemental Sulfur 

5 Partial Oxidation of ra-Butane to Maleic Anhydride Using SiC-Mixed and Pd-Modified Vanadyl Pyrophosphate (VPO) Catalysts (Case study) 

As stated, SiC is expected to act as an efficient heat transfer medium to distribute heat and assist with hot-spot reduction associated with the very high exothermicity of this reaction. The use of SiC as a catalyst support was expected to result in an increase in catalyst lifetime and the prevention of VPO over oxidization [24,25]. To be effective, the thermally conductive material should have a thermal conductivity of at least 1 W m-1K-1 [20], making a-SiC a good candidate material, having a thermal conductivity ranging from 3.7 to 4.9 W m-1K-1. In this work, varying weight percents of the a-SiC were used as a modifier for the as-prepared VPO catalyst. In addition, the small reactor inner diameter (4 mm) ensures that isothermal conditions are favored. 

Sample Catalyst weight (g) Total product weight (g) Total product actual yield (%)a Space time yield g total product kg catalyst x hoperatlon 

This work has demonstrated that a VPO catalyst modified with a-SiC (2 pm) crystallites for use in the partial oxidation of n-butane to MA showed at least an 18 % increase in yield of MA as compared with bulk VPO Table 11.1. 

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N. Keller, C. Pham-Huu and M. Ledoux, Continuous process for selective oxidation of H2S over SiC-supported iron catalysts into elemental sulfur above its dewpoint, Appl. Catal., A, 217, 205-217 (2001). 

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