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AssigneesMitsui Mining & Smelting Co., Ltd., National University Corporation Tottori University, National University Corporation Yokohama National University
InventorsYoshihiro Kamimura, Akira Endou, Yasuo Yamazaki, Naonobu Katada, Satoshi Suganuma, Yoshihiro Kubota, Satoshi Inagaki
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Provided are the following: an MWW type zeolite which has many Brønsted acid sites when in the form of a proton type and which is highly suitable as a cracking catalyst for cumene; a method for producing same; and an application of same. The present invention provides an MWW type zeolite in which the ratio (B/A) of the peak intensity (B) attributable to tetracoordinate aluminum relative to the peak intensity (A) attributable to hexacoordinate aluminum is 2 or more in 27Al MAS NMR, when measured as an ammonium type. The present invention also provides a method for producing an MWW type zeolite, the method having a step for carrying out a hydrothermal synthesis reaction in the presence of: a seed crystal of an MWW type zeolite containing no organic structure-directing agent; and a reaction mixture containing a silica source, an alumina source, an alkali source, an organic structure-directing agent, and water. The reaction mixture satisfies the following molar ratio: X/SiO2<0.15 (here, X denotes the number of moles of the organic structure-directing agent).
An MWW-type zeolite wherein a ratio (B/A) of a peak intensity (B) attributable to tetracoordinate aluminum to a peak intensity (A) attributable to hexacoordinate aluminum is 2 or more in 27Al MAS NMR as measured from an ammonium form of the MWW-type zeolite, wherein the ratio (B/A) refers to a peak height ratio in the NMR chart, wherein the MWW-type zeolite is a calcined product after synthesis, and wherein the 27Al MAS NMR is measured directly from the MWW-type zeolite in a case where the MWW-type zeolite is the ammonium form or measured after the MWW-type zeolite is converted into the ammonium form in a case where the MWW-type zeolite is not in the ammonium form.
Dependencies are inferred from the claim text.