【課題】安価に入手でき、しかも量産に適した原料から製造可能な炭素固体酸を提供するとともに、当該炭素系固体酸の製造に好適な調製条件を満たす製造方法を提供する。併せて、濃硫酸や発煙硫酸を用いた反応よりも効率を高めた製造方法も提案する。 【解決手段】スルホン酸基が導入された以下に定義されるBET比表面積が3〜1600m 2 /gである多孔質炭素からなり、前記多孔質炭素のスルホン酸基量が、0.2mmol/g以上であり、三酸化硫黄または三酸化硫黄を含有したスルホ化剤をセルロース含有原料または植物系原料に接触させてスルホ化する。または、植物系原料に塩化亜鉛またはリン酸を含浸した後、予備炭化として加熱処理して得られたものを、さらに濃硫酸または発煙硫酸中、あるいは三酸化硫黄のガス中または液中でスルホ化として加熱処理する。 【選択図】図1
PROBLEM TO BE SOLVED: To provide a carbon-based solid acid capable of being produced from raw materials which can be obtained at low prices and are suitable for mass production and to provide a method for producing the carbon-based solid acid, which satisfies preparation conditions suitable for producing the carbon-based solid acid and the efficiency of which is made higher than that of a method for producing the carbon-based solid acid by a reaction using strong sulfuric acid or fuming sulfuric acid.SOLUTION: The carbon-based solid acid includes porous carbon into which a sulfonate group is introduced and which has 3-1,600 m/g BET specific surface area to be defined below. The amount of the sulfonate group in the porous carbon is ≥0.2 mmol/g. The porous carbon is sulfonated by bringing sulfur trioxide or a sulfur trioxide-containing sulfonating agent into contact with a cellulose-containing raw material or a vegetable raw material. Otherwise, the porous carbon is sulfonated by impregnating the vegetable raw material with zinc chloride or phosphoric acid, heating and preliminarily carbonating the raw material thus impregnated, and heating and sulfonating the preliminarily-carbonated raw material in strong sulfuric acid or fuming sulfuric acid or in the gas or liquid of sulfur trioxide.




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