摘要:
An object of the present invention is to provide a method and a device, which can suppress poisoning due to CO and efficiently remove a low concentration of amines contained in a gas discharged from a CO2 recovery device that uses various absorbing liquids of CO2 even at low temperature. A discharged gas treatment method for removing amines as absorbent contained in a gas discharged from a CO2 removal device, in which the CO2 removal device has used the amines, the method comprising alternatively performing the step of passing the discharged gas through a catalyst-packed bed which is packed with a catalyst composed of titanium oxide and an oxide of vanadium (V) or titanium oxide, an oxide of vanadium and an oxide of molybdenum (Mo) or tungsten (W), to adsorb and remove the amines contained in the discharged gas; and the step of passing heated air through the catalyst-packed bed wherein the amines are adsorbed thereon to heat the catalyst, and at the same time performing elimination and oxidative decomposition of the adsorbed amines.
摘要:
A catalyst unit is constructed by alternately stacking rectangular catalyst elements (1) formed by cutting catalyst support plates coated with a catalytic material and having ribs (2) inclined at 45.degree. to one specified side edge (1a) of each thereof, and those turned upside down in a case, and the catalyst unit is disposed in a gas passage with the ribs (2) of the catalyst elements (1) inclined at an angle greater than 0.degree. and smaller than 90.degree. to the direction of the gas flow (6). When the catalyst unit comprising the catalyst elements (1) coated with a denitrating catalyst is placed in the gas passage, the ribs (2) of the catalyst elements (1) blocks the gas flow (6) and generate turbulent currents on the downstream side thereof to promote the contact of ammonia and NOx contained in the exhaust gas with the catalyst. When the gas flow (6) is disturbed, the thickness of laminar films covering the surface of the catalyst elements (1) is reduced, so that ammonia and NOx can be easily diffused and the catalytic activity can be enhanced. The catalyst elements exhibits their catalytic abilities effectively without entailing significant pressure loss in the gas flow.
摘要:
A catalyst unit is constructed by alternately stacking rectangular catalyst elements (1) formed by cutting catalyst support plates coated with a catalytic material and having ribs (2) inclined at 45.degree. to one specified side edge (1a) of each thereof, and those turned upside down in a case, and the catalyst unit is disposed in a gas passage with the ribs (2) of the catalyst elements (1) inclined at an angle greater than 0.degree. and smaller than 90.degree. to the direction of the gas flow (6). When the catalyst unit comprising the catalyst elements (1) coated with a denitrating catalyst is placed in the gas passage, the ribs (2) of the catalyst elements (1) blocks the gas flow (6) and generate turbulent currents on the downstream side thereof to promote the contact of ammonia and NOx contained in the exhaust gas with the catalyst. When the gas flow (6) is disturbed, the thickness of laminar films covering the surface of the catalyst elements (1) is reduced, so that ammonia and NOx can be easily diffused and the catalytic activity can be enhanced. The catalyst elements exhibits their catalytic abilities effectively without entailing significant pressure loss in the gas flow.
摘要:
A catalyst for purifying an exhaust gas includes a first component having activity for reducing nitrogen oxides with ammonia and a second component having at least one of activity for forming nitrogen oxide from ammonia and activity for forming carbon dioxide from carbon monoxide. The first component is a composition containing an oxide of at least one member selected from titanium, vanadium, tungsten and molybdenum and the second component is a composition containing a salt of a noble metal selected from platinum, palladium and rhodium or any one of these noble metals supported on a porous material selected from zeolites, alumina and silica. The invention further provides a method for purifying an exhaust gas containing NOx, CO and leak NH.sub.3 using the catalyst.
摘要:
An apparatus for removing of traces of toxic substances from exhaust gas, comprising, disposed in sequence from the upstream side in a flow channel of exhaust gas emitted from combustion equipment, a denitration unit including a denitration catalyst layer capable of removing nitrogen oxides from the exhaust gas and capable of oxidizing metallic mercury; an air preheater adapted for heat exchange between air for combustion in the combustion equipment and the exhaust gas; a dust removal unit having a bag filter containing a catalyst for metallic mercury oxidation; and a desulfurization unit for removing sulfur oxide from the exhaust gas. The bag filter may be disposed in advance of the desulfurization unit. Thus, there can be provided an apparatus for removing of traces of toxic substances from exhaust gas that is stable over a prolonged period of time and is highly reliable; and provided a method of operating the same.
摘要:
An apparatus for removing of traces of toxic substances from exhaust gas, comprising, disposed in sequence from the upstream side in a flow channel of exhaust gas emitted from combustion equipment, a denitration unit including a denitration catalyst layer capable of removing nitrogen oxides from the exhaust gas and capable of oxidizing metallic mercury; an air preheater adapted for heat exchange between air for combustion in the combustion equipment and the exhaust gas; a dust removal unit having a bag filter containing a catalyst for metallic mercury oxidation; and a desulfurization unit for removing sulfur oxide from the exhaust gas. The bag filter may be disposed in advance of the desulfurization unit. Thus, there can be provided an apparatus for removing of traces of toxic substances from exhaust gas that is stable over a prolonged period of time and is highly reliable; and provided a method of operating the same.
摘要:
The invention is to provide (1) a method for decomposing chlorine containing organic compounds (DXNs) contained in an exhaust gas in which method a high decomposition ratio of the DXNs can be obtained even at a low temperature and the effects by SOx can be repressed to a minimum and (2) a method for treating a used catalyst; the method for decomposing DXNs contained in an exhaust gas comprises contacting the DXNs contained in the exhaust gas with nitrogen dioxide (NO2) which is contained in the exhaust gas or added from the outside into the exhaust gas at 100 to 450° C. in the presence of a catalyst comprising a titanium oxideu, molybdenum oxide, and vanadium oxide, the contents of Ti, Mo, and V in which catalyst being in the range of 99 to 70/0.5 to 15/0.5 to 15 in terms of atomic ratio, respectively, to oxidatively decompose the DXNs with the nitrogen dioxide; and acocording to the method for treating a used catalyst, the DXNs adhered to the catalyst can be made innoxious by contacting the used catalyst with a gas containing NO2 to oxidatively decompose the DXN2 adhered to the catalyst, with the NO2.
摘要:
Provided is a silver-supported alumina catalyst for reducing nitrogen oxides using ethanol, which has the drawbacks of the conventional silver-supported alumina catalysts improved, has high performance, is not likely to deteriorate over time, and has excellent initial performance and durability.A catalyst for purifying nitrogen oxides, which purifies nitrogen oxides in exhaust gas using an alcohol as a reducing agent, and contains alumina, aluminum sulfate and silver as main components.
摘要:
Provided is a catalyst structure used for purifying an exhaust gas; to be disposed in an exhaust gas flow passage; preferable for obtaining a highly efficient and compact exhaust gas purifying apparatus; and produced by alternately stacking platelike catalysts 1, and gas dispersing members composed of netlike products 7 having many holes passing from the front surface to the back surface thereof, or linear, belt-shaped, or rodlike materials of a metal, ceramic, or glass to disturb the flow of an exhaust gas in a flow passage of the gas thereby to promote contact of the gas to be treated with the catalyst.
摘要:
Provided is a method capable of removing a low concentration of amines contained in an exhaust gas that is discharged from a CO2 recovery process, at low temperature with high efficiency.A method of treating an exhaust gas containing carbon dioxide, the method including absorbing and removing CO2 by bringing an exhaust gas containing carbon dioxide (CO2) and nitrogen oxides, into contact with a CO2 absorbent liquid containing amines, subsequently bringing the resultant into contact with a catalyst comprising titanium oxide and an oxide of vanadium (V), or from titanium oxide, an oxide of vanadium (V) and an oxide of molybdenum (Mo) or tungsten (W), at a temperature of 130° C. to 250° C., and thereby oxidizing and removing the amines.