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The catalytic activity of a pitch-based activated carbon fiber (ACF) of very large surface area (OG-20A) was studied for NO-NH 3 reaction in a flow reactor at ambient temperatures. The ACF exhibited the highest activity in wet as well as dry gas among heat-treated ACFs so far examined by the present authors. The calcination at 1100 o C was essential to exhibit the highest activity...
The recent development of de-SO x and de-NO x using activated carbon fibers (ACF) in Japan is introduced in this review comparing it with the conventional commercialized system. Pitch-based ACFs showed higher de-SO x activity than other ACFs from different precursors. De-SO x activity can be further modified by the heat-treatment, continuous and complete removal of...
Pore size control of a series of activated carbon fibers was attempted by chemical vapor deposition (CVD) of benzene to clarify the influence of the pore distribution on the development of molecular sieving ability. Weight increase by CVD was found to saturate at a certain level respective to the fiber, reflecting their surface areas. However, when saturation was obtained, the molecular sieving...
Catalytic oxidation of NO (380 ppmv) to NO 2 over activated carbon fibres of moderate surface area (∼800 m 2 g -1 ) at room temperature was carried out, to develop oxidative removal of NO from flue gas. The heat treatment of pitch-based activated carbon fibres of moderate surface area markedly increased the conversion of NO to 87% in dry air, 62% in air of 80% relative...
Continuous removal of SO 2 as aqueous H 2 SO 4 over polyacrylonitrile-based activated carbon fibres (PAN-ACF) was studied kinetically at room temperature to determine the effects of SO 2 (20-1000 ppmv), O 2 (0-10 vol.%) and H 2 O (0-10 vol.%) concentrations and W/Q ratio (mass of ACF/volumetric flow rate of gas). An oxygen level > 3 vol.% was sufficient...
Sulfur dioxide was continuously converted to aqueous sulfuric acid using a polyacrylonitrile-based activated carbon fibre catalyst (PAN-ACF) in a packed-bed reactor system. The qualitative effects of residence time and oxygen, nitrous oxide, sulfur dioxide, and water concentrations were reported in Part 1. The conversion conditions were chosen to be typical of those expected in flue gas streams:...
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