Showing papers on "BET theory published in 1982"

Process for the production of ammonia

Abstract: In an improved ammonia production a purge taken from a recycle stream of a primary reactor is fed without compression over an ammonia synthesis catalyst comprising a transition metal, eg ruthenium, promoted by alkali or alkaline earth metal on a carbon support having a basal plane surface area of at least 100 m /g, a ratio of BET surface area to basal plane surface area of not more than 5:1 and a ratio of basal plane surface area to edge surface area of at least 5:1

Relative catalytic activity of iron containing minerals for the hydrogasification of coal

Abstract: Investigation of the catalytic activity of several iron compounds on hydrogasification of coal showed that catalytic activity is dependent on the particular iron compound with the following order observed: Fe/sub 2/O/sub 3/ > Fe/sub 3/O/sub 4/ > FeSO/sub 4/ > FeS/sub 2/ > FeO > Fe In this paper results of two series of experiments performed to aid in interpreting this dependence of reduced iron catalytic activity on precursor species are described The assumption was made that the role of reduced iron in catalzing hydrogasification is dissociation of H/sub 2/ Also, there was evidence that catalysts affected gasification by physical interaction with the coal Hydrogen transfer activity of the reduced iron state for six iron containing minerals were measured Each mineral resulted in a different active site density The nitrogen BET surface area and total pore volume on coal char samples with added iron containing minerals were measured Again, each mineral affected the physical structure of the char differently The investigators concluded that the catalytic activity of iron containing minerals for the hydrogasification of coal is related both to the hydrogen transfer active site density in the reduced iron state of each mineral and to the physical effect each mineralmore » has on increasing surface area and pore volume of the devolatized coal char« less

Catalyst useful for oxidation and combustion of carbon

Abstract: PURPOSE:To effectively reburn floating or free carbon at a relatively lower temperature, by using a catalyst having BET surface area of 5m /g or more, a specified pore distribution and a catalytic component-sustaining depth of 10mu or less from the outermost surface. CONSTITUTION:A catalyst sustained on a carrier is prepared in a manner such that its BET surface area is 5m /g or more, that the pore volume ratio of micropores having a hole size of 10Angstrom or less to macropores having a hole size of 0.1mu or more in its pore distribution is in the range of 1:5-1:150, and that its catalyst-sustaining depth is 10mu or less from the outermost surface. Thus, the carbon-oxidizing burning catalyst effective in recombustion of floating or free carbon, which is an incomlete combustion product in combustion of various fuels or combustibles, at a relatively lower temperature is obtained.