71.ゼオライト合成原料としての褐炭フライアッシュの利用

概要

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Lignite fly ash was used as a raw material for synthesis of ZSM-5 zeolite and zeolite Y. The effects of reaction temperature, SiO_2/Al_2O_3 mole ratio, NaOH concentration, initial pressure and reaction time on yields of zeolite products are investigated. Maximum yield of ZSM-5 zeolite (59wt%) was obtained at SiO_2/Al_2O_3 mole ratio, 40; initial pressure, 4 bar; treatment temperature, 210℃ and treatment period, 4h. The maximum yield of zeolite Y of 37wt% was achieved at different conditions. Catalytic performance of zeolite product was investigated for CO_2 hydrogenation. The CO_2 conversion at 500℃ were 30 and 41% with ZSM-5 zeolite and zeolite Y from fly ash, respectively. It was a little higher than the commercial zeolite. The main products were methane, carbon monoxide and C_2-C_3.
一般社団法人日本エネルギー学会の論文
2003-10-23