摘要:
A method for treating a gas characterized in that a low temperature plasma is generated in the presence of a metallic oxide oxidation catalyst, and an apparatus for treating a gas characterized by containing a low temperature plasma-generating unit carrying a metallic oxide oxidation catalyst are disclosed. According to the treating method and the treating apparatus, harmful components (such as carbon monoxide or a volatile organic compound) in a gas to be treated can be efficiently oxidized and rendered harmless, a foul odor may be rendered odorless, and further, microorganisms may be removed from and reduced in the treated gas.
摘要:
A device for cleaning a noxious gas comprising a means (11) for supplying a gas containing a noxious gas component, a buffer means using a liquid (42) which dissolves the noxious gas component in the supplied gas temporarily for later releasing, and a means (51) for cleaning the noxious gas component in the gas supplied from the buffer means, wherein the liquid (42) in the buffer means dissolves the noxious gas component when the concentration of the noxious gas component in the supplied gas is high and releases the noxious gas component dissolved thus far when the concentration is low, water being used as the liquid when the noxious gas is ethylene oxide.
摘要:
A purifier of a noxious gas is provided with means for supplying a gas containing a noxious gas component, buffer means using a liquid which dissolves the noxious gas component in the supplied gas temporarily and later releases the dissolved noxious gas component, and means for purifying the noxious gas component in the gas supplied from the buffer means. The liquid in the buffer means dissolves the noxious gas component when the concentration of the noxious gas component in the supplied gas is high and releases the noxious gas component dissolved thus far when the concentration is low. When the noxious gas is ethylene oxide, water is used as the liquid.
摘要:
Fluorine contained within a photocatalyst layer containing titanium oxide and other metallic oxide semiconductors increases the metallic oxide s photocatalytic activity. The described photocatalyst may be in the form of either film, flake, particulate, or fiber. In addition, it can be used for coating the surface of a base material of various forms, such as sheet, film, flake, particulate, bar, or fiber. When using a base material that has an alkaline-containing glass composition, establishing a fluorine-containing layer, such as a layer of fluorine-containing silicon dioxide and other metallic oxide, between the photocatalyst film and the base material can prevent the deterioration of photocatalytic activity of the photocatalyst layer. The fluorine-containing layer functions as an alkaline barrier that controls the diffusion and migration of alkali metallic ions in the glass fibers, such as Na ions, into the photocatalyst layer. Inorganic fiber- and glass sheet-based photocatalyst bearing materials have an excellent capability to decompose rarefied harmful organic gases, and are suitable for use as interior wall and air filters in super clean enclosed spaces and conveyance spaces for semiconductor production, clean rooms for various other purposes, and office and residential buildings, and for other purposes including air cleaning, antibacterial action, anti-fouling action, and defogging of clear sheets (maintaining hydrophilicity).
摘要:
The description relates to a honeycomb catalyst base primarily consisting of SiO2 which comprises at least one calcined and subsequently acid-leached silicate laminate with a pore volume of some 0.1 to 1.2 ml/g and a specific area (to BET) of some 20 to 400 m2/g and additionally some 10 to 50 wt.%. amorphous silicic acid or amorphous aluminium silicate, and has a web width of some 0.1 to 5 mm, in which the ratio between web width and interstice is about 1:5 to 5:1. The catalyst base can be produced by making at least one finely divided silicate laminate with a specific area of over 10 m2/g, preferably about 40 to 500 m2/g, into a paste with a liquid, preferably water, extruding this into comb-like mouldings, drying the mouldings and calcining them at a temperature of some 50 to 200 °C below the sintering temperature of silicon dioxide or aluminium silicate and subjecting the calcined mouldings to an acid treatment. The catalyst base can be charged with at least one catalytically active element from group (1A, 1B, 2A, 2B, 6A) and/or (8) of the periodic system. The catalyst can be used to produce unsaturated esters from olefines, acids and oxygen in the gas phase, to purify organically polluted exhaust air and to alkylate aromatics, especially for producing ethyl benzole from benzole and ethylene.