Calcined shot coke

In an attempt to explain the activity of Nafion it was hypothesized that the SO3H groups were not in the inverted micelle, but rather were exposed at the surface of the micelle. This observation suggested selecting a different hydrophobic material. The next approach was to utilize a liquid composition of Nafion and coat a hydrophobic support such as carbon. The carbon selected was calcined shot coke, a material with very large pores. The mean pore diameter was about lOOOA. 

The liquid composition of Nafion , approximately 5 wt% solution, was used to coat the calcined shot coke (10-20 mesh, 0.42m /gram). Loadings were varied up to 3 wt%. The oligomerization of isobutylene in toluene at 110°C was used to measure the activity of the sulfonic acid catalysts. Table 4 compares the activity of several supported and non-supported sulfonic acid polymers. The... 

CSC is calcined shot coke DOW fluorocarbon sulfonic acid polymer on a-alumina. 

The coefficient of thermal expansion of calcined shot coke is too high, making it unsuitable for high-quality anode production. 

There are basic differences in coke sizing and structure for delayed and fluid cokes because of differences in the two coking operations. Sometimes, fluidization occurs in delayed coke drums when the feed has a high asphaltene content and the recycle ratio is low. Such conditions tend to produce millimeter-size "shot" coke, which is very isotropic, and yields a calcined coke which is very hard with low porosity and high density. Such coke is hard to... 

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