Zinc Oxide adsorbents for sulfur removal from hydrocarbon process feeds are accepted method in industry for pre-treatment of feed gas to steam reforming units. The efficiency and capacity of the current range of Zinc Oxides desulfurizing catalyst allows sulfur to be removed from the process feed on a continuous basis and to the levels necessary to protect the downstream nickel reforming catalysts.
Parmolsiv® 3A is a kind of alkali alumina silicate and able to absorb molecules with their critical diameters no more than 3A. It is the potassium form of the type A crystal structure. Type 3A has an effective pore opening of about 3 angstroms (0.3nm). This is large enough to allow in moisture, but excludes molecules such as unsaturated hydrocarbons which can potentially form polymers; and this maximizes lifetime when dehydrating such molecules.