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A kind of meapso-34 molecular sieve and synthetic method thereof

A technology of molecular sieves and mixtures, applied in the field of molecular sieves, can solve the problems of cumbersome synthesis methods, increased time costs, equipment usage costs, and long time consumption

Active Publication Date: 2021-04-30
CHIA TAI ENERGY MATERIALS DALIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The yield of molecular sieves can be increased by adding seed crystals or seed crystal guiding fluids, but the hydrothermal stability is poor, and the synthesis method is cumbersome and time-consuming
[0005] In summary, there are still many problems that need to be improved in the improvement technology of SAPO-34 molecular sieve, such as the catalytic performance, catalytic life and hydrothermal stability of molecular sieve, and the current synthesis method is cumbersome and time-consuming, which increases the time cost and equipment costs

Method used

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  • A kind of meapso-34 molecular sieve and synthetic method thereof
  • A kind of meapso-34 molecular sieve and synthetic method thereof
  • A kind of meapso-34 molecular sieve and synthetic method thereof

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preparation example Construction

[0036] The synthetic method of above-mentioned MeAPSO-34 molecular sieve, comprises the following steps:

[0037] (1) mixing zeolite imidazolate framework material, aluminum source, phosphorus source, silicon source, templating agent and water according to a certain ratio to form an initial gel mixture;

[0038] (2) Pour the initial gel mixture into the reaction kettle, and perform aging treatment at 100-180° C. for 4-24 hours;

[0039] (3) heating up, and crystallizing the aging-treated mixture at 170-220° C. for 4-72 hours to obtain a crystallized product;

[0040] (4) After the crystallization is completed, the crystallized product is cooled to room temperature, and the solid powder obtained after washing, centrifuging and drying is MeAPSO-34 molecular sieve.

Embodiment 1

[0042] A MeAPSO-34 molecular sieve, prepared and synthesized by the following raw materials: ZIF-67, aluminum isopropoxide, phosphoric acid, silica sol, triethylamine and water; the aluminum isopropoxide, silica sol, phosphoric acid, triethylamine and water The molar ratio of ZIF-67 to aluminum isopropoxide is 0.06:1.

[0043] The synthetic method of above-mentioned MeAPSO-34 molecular sieve, comprises the following steps:

[0044] (1) Add water in a beaker, add zeolite imidazolate framework material, aluminum source, phosphorus source, silicon source and templating agent in proportion to it, stir evenly, form initial gel mixture;

[0045] (2) Pour the initial gel mixture into a stainless steel reaction kettle, and place it in a rotary oven at 150°C for aging treatment for 10 hours;

[0046] (3) heating up, and crystallizing the aging-treated mixture at 200° C. for 8 hours to obtain a crystallized product;

[0047] (4) After the crystallization is completed, the crystallized p...

Embodiment 2

[0054] A kind of MeAPSO-34 molecular sieve, is prepared synthetically by following raw material: ZIF-67, ZIF-8, aluminum isopropoxide, phosphoric acid, silica sol, triethylamine and water, and the difference of embodiment 1 is that the isopropanol The molar ratio of aluminum, silica sol, phosphoric acid, triethylamine and water is 1:0.4:1.5:2.5:60, and the mass ratios of ZIF-67, ZIF-8 and aluminum isopropoxide are 0.04:1 and 0.02:1, respectively .

[0055] In this example, ZIF-67 and ZIF-8 were used as heteroatom sources, and the prepared MeAPSO-34 molecular sieve was a mixed molecular sieve of CoAPSO-34 and ZnAPSO-34.

[0056] The synthesized MeAPSO-34 molecular sieve was characterized by X-ray diffraction (XRD), as figure 1 As shown, the solid product structure is a CHA-type skeleton structure.

[0057] The electron micrograph of the synthesized MeAPSO-34 molecular sieve is as image 3 As shown, the grain size is about 4 microns, and the morphology is cubic.

[0058] Aft...

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Abstract

The invention discloses a MeAPSO-34 molecular sieve and a synthesis method thereof. The MeAPSO-34 molecular sieve is prepared and synthesized from the following raw materials: a zeolite imidazolate skeleton structure material, an aluminum source, a phosphorus source, a silicon source, a template agent and water, and the aluminum The molar ratio of source, silicon source, phosphorus source, templating agent and water is 1:(0.1~1):(0.75~3):(0.5~5):(20~100), and the zeolite imidazolate framework material The mass ratio to the aluminum source is (0.005-0.3):1. The zeolite imidazolate framework material used in the present invention can not only introduce its metal ions into the SAPO-34 molecular sieve framework, but also play the role of assisting crystal seeds. The synthesized MeAPSO-34 molecular sieve has excellent catalytic performance and hydrothermal stability Good property and long service life, the synthetic method step is simple, shortens synthetic time at the same time.

Description

technical field [0001] The invention belongs to the field of molecular sieves, in particular to a MeAPSO-34 molecular sieve and a synthesis method thereof. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important basic chemical raw materials, and methanol-to-olefin (MTO) technology is currently an important chemical technology. SAPO-34 molecular sieve is a microporous crystal composed of [SiO 4 ], [AlO 4 ], and [PO 4 ] tetrahedral units. It has excellent hydrothermal stability, acidic active center and pore structure, and has excellent methanol production The catalytic reaction performance of olefins has therefore become the core of the methanol-to-olefins technical route and an important active component of the reaction catalyst. [0003] Patent CN201410786430.0 discloses a method for synthesizing metal-modified SAPO-34 molecular sieves. Metal salts are mixed with the crystallization mother liquor of SAPO-34 molecular sieves to form met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/54
CPCC01B39/54
Inventor 王亚松胡小倩王闯袁龙姜叶葳程士敏罗金玲
Owner CHIA TAI ENERGY MATERIALS DALIAN