Abstract: An adsorption process is disclosed for removal of acid gas contaminants from a liquid or gas which comprises providing an activated alumina adsorbent which is impregnated with a compound selected from the group consisting of one or more alkali metal compounds, one or more alkaline earth metal compounds, or a mixture of such compounds; contacting the liquid or gas containing acid gas contaminants with the activated alumina adsorbent to adsorb enough acid gas contaminant in the liquid or gas to lower the contaminant content of the liquid or gas, the alumina adsorbent being formed from agglomerated calcined alumina powder and provided with a mercury pore volume of pores greater than 500 angstroms at least 0.10 cc/g.

Abstract: An improved adsorbent useful in removing contaminants from various hydrocarbon streams comprises a zeolite, an alumina and an added metal component provided in the adsorbent by initially contacting primarily the zeolite with the added metal. In a specific application, an adsorbent comprising sodium-impregnated zeolite Y and alumina is used to purify an ethylene stream in order to remove CO2, H2S, methanol, and other S- and O-containing compounds.

Abstract: An improved adsorbent useful in removing contaminants from various hydrocarbon streams comprises a zeolite, an alumina and an added metal component provided in the adsorbent by initially contacting primarily the zeolite with the added metal. In a specific application, an adsorbent comprising sodium-impregnated zeolite Y and alumina is used to purify an ethylene stream in order to remove CO2, H2S, methanol, and other S- and O-containing compounds.

Abstract: A process for treating an engine exhaust gas stream is disclosed. The process involves arranging a catalyst bed and a molecular sieve bed side by side with a connecting pipe between and parallel to the two beds. When the engine is first started, the cool exhaust is flowed through the catalyst bed, then through the connecting pipe, then through the molecular sieve bed and finally discharged to the atmosphere. When the molecular sieve bed reaches a temperature of about 150.degree. C. to about 200.degree. C. the exhaust stream is diverted such that it is first flowed through the molecular sieve bed, to desorb the adsorbed hydrocarbons, and then through the catalyst bed and finally discharged to the atmosphere. Finally, when all the hydrocarbons are desorbed from the molecular sieve bed, the exhaust stream is diverted such that it is flowed through the catalyst bed and then discharged to the atmosphere.