MWW type zeolite, method for producing same, and cracking catalyst
US11447396B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 28, 2018 |
| Grant date | Sep 20, 2022 |
| Priority date | — |
| Expiry date | Nov 28, 2038 |
Classification
- Technology area (CPC —)General
Abstract
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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.