Method of reproducing molecular sieve crystallization processes and describing appearances
A molecular sieve and appearance technology, applied in image data processing, instruments, etc., can solve the problems of not providing a mathematical model of crystal growth, it is difficult to find high-frequency electromagnetic rays, etc., and achieve great guiding significance and wide applicability
Active Publication Date: 2016-07-06
CHINA PETROLEUM & CHEM CORP +1
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However, this scheme does not provide a mathematical model of crystal growth for this type of system; secondly, the He-Ne laser wavelength given in the examples is 632.8nm, and the relevant laser half-wavelength is limited. The crystal size that can be measured by this method should not be less than It is about 320nm, so it is difficult to find high-frequency electromagnetic wave rays that can produce stable interference for small-particle nanoscale crystals
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Embodiment 1
[0060] Taking industrial grade NaY molecular sieve as an example, the crystallization process of FAU molecular sieve and the method of describing its appearance are described in detail, including the following steps:
[0061] 1. Screening and establishment of primary cells in FAU molecular sieve crystals:
[0062] 1) Analyze the recurring structural units in the structure of industrial grade NaY molecular sieves, such as Figure 4 Various basic structural units such as A, B, C, D, E shown;
[0063] 2) Considering the symmetry of the original cell itself, the complexity of the subsequent automaton algorithm, and the related calculation intensity, etc., the selection of the original cell is analyzed in turn, and the silicon-oxygen or aluminum-oxygen tetrahedron in the molecular sieve can be used as the original cell. As shown in Figure A, four-membered rings or six-membered rings composed of silicon-oxygen or aluminum-oxygen tetrahedrons can also be used as primitive cells, as ...
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The invention relates to a method of reproducing molecular sieve crystallization processes and describing appearances, comprising the steps of: first, screening and establishing primitive cells; second, establishing a crystal growth dynamic model; third, obtaining crystal surface primitive cell position data; and fourth, drafting a molecular sieve crystal appearance graph according to the crystal surface primitive cell position data. The method utilizes a cellular automation and random theoretical method and a multi-core computer string / parallel calculating mode to dynamically describe molecular sieve crystal growth processes, and draft molecular sieve appearances according with industrial molecular sieve real characteristics and having different resolutions, and possesses important guiding significance and wide applicability in molecular sieve crystallization processes and appearance reconstruction.
Description
technical field [0001] The invention relates to a method for reproducing the crystallization process of a molecular sieve and describing its appearance, and belongs to the technical field of crystal-type catalytic material structure research. Background technique [0002] For a long time, molecular sieves have been widely used in industry as an important carrier of industrial catalysts, especially cracking catalysts. However, the mechanistic research on related catalytic processes is still in its infancy. On the one hand, the reason is rooted in the extreme complexity of the nature of the catalytic process; on the other hand, the research model adopted in the classical mechanism research is a hypothetical ideal unit cell structure, and this ideal unit cell structure is quite different from the real morphology of industrial molecular sieves. As a result, there is a disconnect between theoretical research and practical application, and the research results cannot be truly app...
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IPC IPC(8): G06T19/20
Inventor 王阔
Owner CHINA PETROLEUM & CHEM CORP