Next, activated alumina, activated bauxite, activated carbon, attapulgite clay, and diatomaceous earth were experimentally evaluated for their sulfur adsorption capabilities from methanol that had been doped with 1 voI% diesel fuel (containing 0.29% S). Activated carbon (AC) was found to be the most effective. Subsequently, several commercially available activated carbons (Table 2) made with different starting materials and activation processes were screened. In general, the coconut-based carbons activated by high-temperature steam were found to be more effective than the coal-based activated carbons in removing sulfur compounds from the contaminated methanol.

Table 2. List of Activated Carbons Tested for the Adsorption of Sulfur in Methanol

Carbon Type

Raw Material

Activation Process

Surface Area," m2/g

Filtrasorb 400b

Bituminous Coal

High Temp. (HT) Steam

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