SSZ-13 molecular sieve, method for regulating crystal morphology of SSZ-13 molecular sieve and application of SSZ-13 molecular sieve

Abstract

The invention belongs to the technical field of molecular sieve preparation, and relates to an SSZ-13 molecular sieve, a method for regulating and controlling the crystal morphology of the SSZ-13 molecular sieve and application of the SSZ-13 molecular In order to solve the technical problems that the SSZ-13 molecular sieve is large in particle size and uneven in particle size distribution due to the fact that the SSZ-13 molecular sieve morphology control technology is difficult to control in the prior art, the method for controlling the SSZ-13 molecular sieve crystal morphology is provided, a silicon source, an aluminum source, alkali and a structure-directing agent are added into pure water to be mixed evenly, then a crystal morphology control agent is added for further treatment, and the SSZ-13 molecular sieve crystal morphology is obtained. According to the method, the crystal morphology and size of the SSZ-13 molecular sieve can be effectively controlled, the SSZ-13 molecular sieve of a cubic, polyhedral or spherical crystal can be prepared, the grain size of the crystal is small and can be adjusted within a certain range, and the grain size distribution is uniform. When being used as an SCR (selective catalytic reduction) denitration catalyst to be applied to the field of automobile exhaust treatment, the catalyst shows high denitration catalytic performance, high hydrothermal aging stability and wider effective working temperature range.

Description

technical field [0001] The invention belongs to the technical field of molecular sieve preparation, and in particular relates to a SSZ-13 molecular sieve, a method for regulating its crystal morphology and its application. Background technique [0002] SSZ-13 molecular sieve is a crystalline porous material of aluminosilicate with a CHA-type topology, which has an eight-membered ring window cage structure of 0.38 × 0.38 nm. SSZ-13 molecular sieve is used in catalytic conversion of methanol to olefins (MTO) or ethylene to propylene (ETP), as well as CO 2 / CH 4 or C 2 H 4 / C 2 H 6 It is widely used in adsorption and separation industries such as The Cu-SSZ-13 loaded with metal ions is used as a selective catalytic reduction (SCR) catalyst in exhaust gas treatment, which can reduce the nitrogen oxides (NO X ) into N 2 and H 2 O, etc., have huge industrial application prospects. According to different application scenarios (such as stationary source or mobile source ex...

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Problems solved by technology

[0005] Aiming at the technical problem that the shape regulation process of SSZ-13 molecular sieve is difficult to control in the prior art, resulting in large particle size and uneven particle size distribution of SSZ-13 molecular sieve, the present invention provides a method for regulating the crystal shape of SSZ-13 molecular sieve, By adding silicon source, aluminum source, alkali, and structure-directing agent into pure water and mixing, and then adding crystal morphology regulator for further treatment, the crystal morphology and size of SSZ-13 molecular sieve can be effectively controlled, and regular cubes, polyhedrons or SSZ-13 molecular sieve with spherical crystals, and the crystal particle size is small, adjustable within a certain range, and the particle size distribution is uniform

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