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Mordenite molecular sieve as well as preparation method and application thereof

A technology of mordenite and molecular sieve, which is applied in the direction of mercerized crystalline aluminum silicate zeolite, molecular sieve catalyst, molecular sieve and alkali exchange compound, etc. It can solve the problems of small particles, uncontrollable particle shape, high crystallization temperature, etc.

Active Publication Date: 2019-12-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems such as the particles are too small, the shape of the particles cannot be controlled, and the crystallization temperature is too high.

Method used

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  • Mordenite molecular sieve as well as preparation method and application thereof
  • Mordenite molecular sieve as well as preparation method and application thereof
  • Mordenite molecular sieve as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] The preparation of the former powder of embodiment 1 mordenite molecular sieve

[0109] It is synthesized by hydrothermal method, and the specific batching process is as follows, sequentially add 5.30g of water, 0.42g of sodium aluminate, 0.58g of NaOH and stir evenly, then add 13.10g of silica sol (31wt%) and mix and stir for 1 hour, then transfer the mixture to a stainless steel In the reaction kettle, seal it, and place it in an oven preheated to 165°C for crystallization for 48 hours. After the crystallization, the solid product was centrifuged, washed, and dried in air at 100° C. to obtain the original powder of mordenite molecular sieve (MOR).

Embodiment 2～17

[0110] The preparation of embodiment 2~17 mordenite molecular sieves

[0111] Mordenite molecular sieves were prepared by the following steps:

[0112] a) Mix and stir the aluminum source, the alkali source, the amine / ammonium substance and water in proportion, and record it as mixture A;

[0113] b) Soak the silicon source in A for a period of time, the volume ratio of the silicon source to A is 0.2-0.5:1; filter to remove excess liquid to obtain precursor B.

[0114] c) Pre-add the mixed liquid of nitrogen-containing compound and water in the reactor, the molar ratio of nitrogen-containing compound and water is 0.001-0.05:1, and place the precursor in step b) in the polytetrafluoroethylene in the reactor In the lining, the distance between the precursor and the liquid at the bottom of the reactor is 4-5 cm. After the reaction kettle is sealed, it is aged at 80-120°C for 0.5-12 hours. Then heat up to 150-210°C to crystallize for 24-144 hours, wash the solid product with de...

Embodiment 18

[0132] XRD characterization of embodiment 18 mordenite molecular sieve

[0133] right Example 1 The structure of the obtained sample was characterized by XRD, and the XRD data results are shown in Table 2. The results show that the sample of Example 1 conforms to the MOR structural feature through XRD analysis, that is, the obtained solid sample is mordenite molecular sieve.

[0134] The raw mordenite molecular sieve powder sample obtained in this example was used as a standard sample for XRD characterization analysis of samples obtained in subsequent examples.

[0135] right Example 2-17 The sample obtained in carries out XRD characterization, and its XRD result is compared with the XRD data of embodiment 1 sample, the result shows, the XRD data of the sample obtained in embodiment 2-17 is similar to the XRD data of embodiment 1 sample, That is, the peak positions are similar, but the peak intensities are slightly different, indicating that the samples synthesized in Exa...

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Abstract

The invention discloses a mordenite molecular sieve, which is a millimeter-scale spherical molecular sieve; wherein the mordenite molecular sieve is obtained by assembling micron-sized flaky mordenitecrystals; the specific surface area of the mordenite molecular sieve is 200-500 m<2> / g, and the pore volume is 0.1-0.3 cm<3> / g. The molecular sieve is binder-free spherical mordenite suitable for fixed bed and moving bed reactors, wherein the size of the molecular sieve is adjustable within a certain range, and the molecular sieve macroscopically has a millimeter-scale spherical structure and hashigh mechanical strength. The invention further discloses a preparation method of the mordenite molecular sieve and application of the mordenite molecular sieve in acid catalytic reaction and reaction for preparing carbonyl compounds through oxygen-containing compound conversion, the method is high in raw material conversion efficiency and simple and efficient in treatment process, and the mordenite molecular sieve prepared through the method shows good catalytic performance when used as a catalyst.

Description

technical field [0001] The application relates to a mordenite molecular sieve, its preparation method and application, and belongs to the fields of chemical engineering and catalyst preparation. Background technique [0002] The role of molecular sieves in the catalytic process is particularly important, and has been applied in catalytic cracking, aromatics isomerization, methanol to olefins and other reaction processes, resulting in huge economic benefits. Molecular sieves obtained by traditional methods are in powder form and cannot be directly applied to industrial reactors. A shaping process is generally required to obtain a granular catalyst. Since the molecular sieve itself is a barren material, a binder must be added to increase the mechanical strength. The inorganic binder will remain in the catalyst, resulting in a decrease in the molecular sieve content in the catalyst and a decrease in the activity of the catalyst. Binders also affect the diffusion of reactants...

Claims

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Application Information

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IPC IPC(8): C01B39/26B01J29/18C07C67/00C07C69/14
CPCB01J29/18C01B39/26C01B39/265C01P2002/72C01P2004/03C01P2006/12C01P2006/14C01P2006/17C01P2006/21C07C67/00C07C69/14
Inventor 李凌云田鹏王全义刘中民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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