Theodore A Gens

42357497, Nov 25, 1980

Sep 17, 1979

6/076288

Theodore A. Gens - Lake Zurich IL

Indianapolis Center for Advanced Research - Indianapolis IN

B01J 2378
B01J 2720

252443

The activity of conventional iron-based ammonia synthesis catalysts is enhanced by supplying alkali to the finished catalyst by vapor transpiration, either during preparation of the catalyst or during its use in synthesis operation, or during both. The catalyst used may contain one or more conventional promoters, including alkali embodied in the catalyst during its manufacture. The vapor transpiration provides increased effective alkali at the catalyst surfaces in the form of a inorganic compound, such as the hydroxide or carbonate or hydride. It avoids the problem of loss of surface area which would result from adding more alkali during manufacture of the catalyst. Vapor transpiration conditions, especially the relative temperatures of the vaporization chamber and hence the alkali vapor partial pressure in the catalyst chamber, are controlled to achieve an effective deposition while avoiding pore blockage or reduction of surface area.

45500983, Oct 29, 1985

Nov 12, 1982

6/441383

Theodore A. Gens - Lake Zurich IL

The BOC Group, Inc. - Montvale NJ

B01J 2104
B01J 2378
C01B 1704
B01D 5334

502324

Methods are disclosed for the purification of mixed gas streams containing hydrogen sulfide, carbon dioxide, carbon monoxide, sulfur, hydrogen, and methane and other hydrocarbon gases, and mixtures thereof, by the use of an oxidizing reactive solid. In one method, the oxidizing reactive solid is, in a first step, contacted with the mixed gas stream which may contain, among other gases, hydrogen sulfide and carbon dioxide. The reactive solid removes the hydrogen sulfide in the form of elemental sulfur with no detectable formation of sulfur oxide. The reactive solid also partially removes the carbon dioxide from the mixed gas stream. In the second step of the first method, the oxidizing reactive solid is regenerated by flowing air. In a second method of the present invention, mixed gas streams, containing hydrogen sulfide and oxygen in an approximate stoichiometric amount, are contacted with the solid, and hydrogen sulfide is converted directly to sulfur with minimal formation of compounds of sulfur. The oxidizing reactive solid has the general formula D-M-O, wherein D is chosen from the alkali metals or alkaline earth metals comprising sodium, potassium, lithium, calcium or magnesium; M represents a transition metal selected from the group comprising manganese, copper, and iron, and groups IB, VB, VIB, VIIB or VIII from the Periodic Table; and O designates oxygen.