Patent ID: 9493362
Filing Date: 2016-11-15
CPC Classification: B01J,C01B,Y10T

Claim Text:
1. A DDR-type zeolite powder having a mean particle diameter of 0.1 μm or more and below 2.5 μm and a particle size distribution where particle sizes of 80% or more of the entire particles are within the range from −45% to +90% with respect to the mean particle diameter; wherein a Y value calculated from the formula (III), which shows a ratio of the value of A, which is a value of the diffraction intensity of the diffraction peak attributed to the DDR-type zeolite crystal calculated from the formula (I) is corrected to the value of B, which is a value of the diffraction intensity attributed to the amorphous contained in the DDR-type zeolite powder calculated from the formula (II) is corrected on the basis of diffraction intensity obtained by X-ray diffraction analysis, is 100 or more: wherein, C1 is the minimum value of diffraction intensity between a diffraction peak derived from a (012) face of a DDR-type zeolite crystal and a diffraction peak derived from a (104) face of the same crystal, θ1 is a diffraction angle (2θ) showing C1, C2 is the minimum value of diffraction intensity between a diffraction peak derived from a (606) face of a DDR-type zeolite crystal and a diffraction peak derived from a (1 2 20) face of the same DDR-type zeolite crystal, θ2 is a diffraction angle (2θ) showing C2, Ca is diffraction intensity of a diffraction peak derived from a (024) face of a DDR-type zeolite crystal, θa is a diffraction angle (2θ) showing Ca, Cb is the minimum value of diffraction intensity between a diffraction peak derived from a (122) face of a DDR-type zeolite crystal and a diffraction peak derived from a (027) face of the same DDR-type zeolite crystal, and θb is a diffraction angle (2θ) showing Cb.