Reduction of NO at Very Low Concentration in Air with NH3 at Room Temperature over a Series of Calcined Pitch Based Active Carbon Fibers

Abstract

Catalytic activities of a series of pitch based active carbon fibers (ACFs) were examined for the reduction of NO (10 ppm) with NH3 (20 ppm) at 293 K. A particular ACF of 840 m2 g−1 surface area exhibited the excellent activities after the calcination at 1123 K, providing conversions of 75 and 47 % in dry and wet (80 % relative humidity) air, respectively, at W/F of 5 × 10−3 g min ml−1. The ACF of the largest surface did not show the largest activity.

Kinetic Study on Reduction of NO of Low Concentration in Air with NH3 at Room Temperature over Pitch-Based Active Carbon Fibers of Moderate Surface Area

“…The present study clarified several features of the NO + NH 3 reaction over pitch based active carbon fibers of moderate surface area, reporting the largest activity so far obtained among the commercially available ACFs for NO reduction in wet and dry air at room temperature .…”

“…In a previous paper, a series of pitch-based active carbon fibers activated to varying degrees were examined after calcination up to 850 °C to identify the highest activity ACF among the fibers having moderate surface areas …”

“…In the present study, two such pitch-based active carbon fibers, OG-7A and OG-8A, having a moderate surface area and high catalytic activity, were examined at 600−1000 °C and various humidities, ACF weights, flow rates, and ammonia and NO concentrations, in order to establish their performance and kinetics for the reduction of NO in ambient atmospheres. Temperature-programmed decomposition (TPDE) of the ACFs was applied to measure evolved CO and CO 2 , and the adsorption of ammonia, NO, and H 2 O were also measured to evaluate the role of the active sites and the surface properties of the ACFs subjected to the calcination.…”

High energy density supercapacitors from lignin derived submicron activated carbon fibers in aqueous electrolytes

“…The fibrous form of ACFs makes them easy to handle and to be further processed into various forms of sheets, felts and composites. The high specific surfaces, short diffusive paths and abundant accessible pores to sorbates are desirable characteristics of ACFs for removing toxic gases such as SO 2 [1], NO x [2], organic compounds from air [3] and in waste water [4] as well as in storing hydrogen [5], methane and ethane [6]. Besides those excellent attributes, the high electrical conductivity of ACFs make them good candidate for supercapacitors, a pulse energy storage and delivery device used in the pitch system of wind turbines [7], electric vehicles [8] and actuators [9] to physically uptake and release charges accumulated at the interface of carbon material and the electrolyte.…”

Ultrafine microporous and mesoporous activated carbon fibers from alkali lignin

“…The brous form of ACFs makes them easy to handle and to be fabricated into different forms of textiles, felts and composites that are versatile for applications. With diameters one to three orders of magnitude smaller than PACs, ACFs have signicantly higher specic surfaces, shorter diffusive paths and more accessible pores to sorbates to be used in removing toxic gases, such as SO 2 , 17 NO x , 18 volatile organic compounds 19 and natural gas, 20 in water purication, 21,22 and as capacitors 23,24 and vapor sensors. 25 To date, lignin-based ACFs have only been reported on precursor bers either melt spun from sowood acetic acid lignin 26 or electrospun from Alcell lignin in ethanol.…”