摘要:
Methods and systems for reducing mercury emissions from fluid streams having a high concentration of sulfur oxide species are provided herein. In embodiments, mercury is removed from flue gas streams by injecting a dry admixture of a porous mercury adsorptive material and at least one dry agent into the flue gas stream.
摘要:
Methods and systems for reducing mercury emissions from fluid streams having a high concentration of sulfur oxide species are provided herein. In embodiments, mercury is removed from flue gas streams by injecting a dry admixture of a porous mercury adsorptive material and at least one dry agent into the flue gas stream.
摘要:
Methods and systems for reducing mercury emissions from fluid streams having a high concentration of sulfur oxide species are provided herein. In embodiments, mercury is removed from flue gas streams containing sulfur trioxide (SO3) by injecting a dry admixture of a porous mercury adsorptive material and at least one dry agent into the flue gas stream.
摘要:
A method is provided for reducing the chemical conversion of oxidizable or disproportionable compounds contained in liquid or gaseous process media which contact carbonaceous chars. In this method the carbonaceous char contacting the oxidizable or disproportionable compounds is first treated with a non-nitrogen-containing Bronsted acid. The acid-treated char is then heated to temperatures greater than 750° C. In this manner the inherent catalytic reactivity of the carbon in the char is reduced effectively and largely irreversibly.
摘要:
A method is provided for the removal of metalloid and non-metal hydrides from gas or liquid media. The improvement is provided by the use of a high-temperature carbonaceous char derived from a carbonaceous feedstock which has been exposed to nitrogen-containing compounds at temperatures above 700.degree. C. In the preferred embodiment of the method, the high-temperature carbonaceous char is prepared by carbonizing and oxidizing a bituminous coal at temperatures less than 700.degree. C followed by exposure to urea, ammonia, or nitrogen-containing compound as the temperature is raised to above 700.degree. C.
摘要:
A improved process is provided for the catalytic oxidation of ferrous iron in liquid media in the presence of oxygen. The improvement is provided by the use of a carbonaceous char catalytically active for said oxidation which is prepared by the carbonization and oxidation of a bituminous coal or a bituminous material at temperatures below 700.degree. C. followed by exposure of the carbonized, oxidized char to a nitrogen-containing compound and, during or after said exposure, increasing the temperature to at least 700.degree. C.
摘要:
A method is provided for evaluating the catalytic activity of carbonaceous chars via the decomposition of hydrogen peroxide in contact with such materials. In this method the rise in temperature occasioned by the decomposition of hydrogen peroxide under essentially adiabatic conditions is monitored as a function of time. By use of this method, carbonaceous chars having high catalytic activities may be rapidly and conveniently identified.
摘要:
A process is provided for the removal of peroxides from gaseous or liquid media. The improvement is provided by the use of a carbonaceous char active for peroxide decomposition which is prepared by the carbonization and oxidation of a bituminous coal or bituminous coal-like material at temperatures below 700.degree. C. followed by exposure of the carbonized, oxidized char to a nitrogen-containing compound during the initial calcination and condensation of the carbon structure as the temperature is raised to above 700.degree. C.
摘要:
Carbonaceous chars capable of catalytically decomposing aqueous hydrogen peroxide at higher rates at given char densities than other known catalytic chars are provided for. This improvement is provided by an increase in the catalytic activity at a given char density of the said catalytically-active carbonaceous char. The catalytically-active carbonaceous chars are useful for, but not limited to, the catalytic conversion of H.sub.2 S, SO.sub.x, NO.sub.x, peroxides, and/or chloramines in liquid and/or gaseous media.
摘要:
Methods and systems for reducing mercury emissions are provided herein. The methods, generally, include the steps of burning a heavy metal containing fuel source and introducing sorbent materials and introducing one or more halogen compounds into the combustion chamber and/or exhaust stream to remove the heavy metal.