| 摘要 |
PROBLEM TO BE SOLVED: To provide a pentasil-type zeolite having both a higher BET specific surface area and a higher acid amount than a conventional one and a method for producing the same.SOLUTION: There is provided a pentasil-type zeolite having a BET specific surface area of 450 m/g or more and an acid amount as determined by the ammonia-TPD method of 0.38 mmol/g or more. Such a pentasil-type zeolite can be obtained by a production method which includes a crystallisation step of crystallizing a mixture containing tetrabutylphosphonium cations, a silica source, an alumina source, an alkali metal source and water, where the molar ratio of the alkali metal to the silica in the mixture is more than 0.04 and less than 0.10. |
