Energy & Fuels 1995,9, 659-664
659
Reduction of NO of Very Low Concentration in Air with N H 3 at Room Temperature over Calcined Active Carbon Fibers Isao Mochida," Shizuo Kawano, Motohiro Hironaka, Shunsuke Yatsunami, Yozo Korai, Yuji Matsumura,' and Masaaki Yoshikawa? Institute of Advanced Material Study, Kyushu University, 6-1 Kasugakoen, Kasuga-shi, Fukuoka 81 6, Japan, and Research & Development Center, Osaka Gas Co., Ltd., 6-19-9, Torishima, Konohana-ku, Osaka 554, Japan Received November 16, 1994@
Reduction of very low concentration NO with NH3 at room temperature was examined over active carbon fibers (ACF) derived from pitch (P) and poly(acrylonitri1e)(PAN), in order t o find a way for cleaning the humid atmosphere of 10 ppm NO. As-received (not calcined) ACFs exhibited considerable activity in dry air by converting 50-65% of NO by W/F (weight of fiber/ gas flow) = 5 x lop3gmineml-l; however, humidity especially over 50%,inhibited the reduction very severely. The conversions were 5%over both P-ACF and PAN-ACF at 80%relative humidity (rh). The calcination of P-ACF under N2 flow at 800 "C increased the activity slightly in dry air, and significantly in the wet air. The conversions over P-ACF calcined a t 800 "C were 25% in 80% rh and
