Читать книгу Encyclopedia of Renewable Energy - James Speight G., James G. Speight - Страница 118

Typically, a relatively inexpensive catalyst that is designed to remove impurities and unwanted by-products from gas streams which, at the same time, is sacrificed. For example, alumina (Al₂O₃) guard beds serve as protectors by the act of attrition and may be referred to as an attrition reactor containing an attrition catalyst may be placed ahead of the molecular sieves to remove the sulfur compounds. Downflow reactors are commonly used for adsorption processes, with an upward flow regeneration of the adsorbent and cooling using gas flow in the same direction as adsorption flow.

See also: Guard Bed, Guard Bed Reactor.