超臨界水と炭素含有廃棄物との反応による炭酸ガス固定型水素メタン混合ガス回収(社会・環境)

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Automobile Shredder Residue (ASR) and Refuse derived fuels (not carbonized and carbonized : YRDF and RDF) as carbonaceous wastes were reacted isothermally with sub-supercritical water (600〜695℃, 200atm) together with a CO_2 fixation reagent Ca(OH)_2 inside a closed metallic tube reactor (7cm^3). Product gas mainly consisted of hydrogen gas and a little methane gas except YRDF. As a whole, gas generated more in order ASR, YRDF, and RDF. Addition of catalysis NaOH or KOH made product gas increase more. KOH was more effective to product gas than NaOH. X-ray diffraction followed that Ca(OH)_2 and CaCO_3 existed mainly in residues after reaction tests with a CO_2 fixation reagent Ca(OH)_2 or CaO. Therefore, it was supposed that an overall chemical reaction took place as shown below. BOF steelmaking slag for CO_2 fixation provided maximum gas generation 1.42 times as much as molar carbon in a RDF sample with KOH. C+H_2O+Ca(OH)_2=CaCO_3+2H_2
社団法人日本鉄鋼協会の論文
2005-09-01