Lamellar catalyst containing mesoporous titanium-silicate molecular sieves and preparation method and application of lamellar catalyst

A titanium-silicon molecular sieve and catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effects of improving diffusion, improving activity, and improving lifespan

Inactive Publication Date: 2015-03-25
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, so far, no literature has reported the successful and stable preparation of titanium-containing MWW molecular sieves with mesoporous structures.

Method used

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  • Lamellar catalyst containing mesoporous titanium-silicate molecular sieves and preparation method and application of lamellar catalyst
  • Lamellar catalyst containing mesoporous titanium-silicate molecular sieves and preparation method and application of lamellar catalyst
  • Lamellar catalyst containing mesoporous titanium-silicate molecular sieves and preparation method and application of lamellar catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] [Example 1] Preparation of molecular sieve MCM-22 precursor

[0065] The synthesis of MCM-22 precursor uses white carbon black as silicon source, sodium metaaluminate (NaAlO 2 ) is the aluminum source, and hexamethyleneimine (HMI) is the template agent. A typical synthesis method is as follows: under vigorous stirring, NaOH and NaAlO 2 Dissolve in distilled water, slowly add white carbon black, and finally add HMI. Stirring was continued for 2h to obtain a white gel. The molar composition of the mixture is n(Si):n(Al):n(HMI):n(NaOH):n(H 2 (0) = 1:0.07:0.5:0.1:30. The gel was transferred to a 50 mL stainless steel reaction kettle lined with polytetrafluoroethylene, and crystallized at a temperature of 150 °C for 5 days. The stirring speed is 60r / min. After the crystallization was completed, cool down to room temperature, filter the reaction liquid with suction, and rinse repeatedly with distilled water until the washing liquid is neutral. The resulting white filte...

Embodiment 2

[0066] [Example 2] Preparation of molecular sieve ERB-1 precursor

[0067] The synthesis of ERB-1 precursor uses white carbon black as silicon source, boric acid (H 3 BO 3 ) is the boron source, and piperidine (PI) is the template agent. A typical synthesis method is as follows: under vigorous stirring, dissolve NaOH and boric acid into distilled water, slowly add white carbon black, and finally add PI. Stirring was continued for 2h to obtain a white gel. The molar composition of the mixture is n(Si):n(B):n(PI):n(NaOH):n(H 2 (0)=1:2:1.4:0.12:25. The gel was transferred to a 50 mL stainless steel reaction kettle lined with polytetrafluoroethylene, and crystallized at a temperature of 150 °C for 5 days. The stirring speed is 60r / min. After the crystallization was completed, cool down to room temperature, filter the reaction liquid with suction, and rinse repeatedly with distilled water until the washing liquid is neutral. The resulting white filter cake was dried at 100°C...

Embodiment 3

[0068] [embodiment 3] preparation MCM-22 molecular sieve

[0069] The MCM-22 (P) that [embodiment 1] obtains is put into tubular quartz furnace, under nitrogen atmosphere (SV=1240h -1 ) to 600°C at a rate of 3°C / min. After 30 minutes, switch to air with the same space velocity, and continue calcining for 12 hours to obtain MCM-22 molecular sieve.

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Abstract

The invention relates to a lamellar catalyst containing mesoporous titanium-silicate molecular sieves and a preparation method and application of the stratiform catalyst. The stratiform catalyst is provided with a 12-membered ring hole and sine reticulation hole system of an MWW high-silicon molecular sieve, wherein the interlayer is provided with a 2-10 nm mesoporous structure, 4-coordinated titanium or 4-coordinated and 6-coordinated titanium. The preparation method comprises the following steps: an MWW high-silicon molecular sieve containing a template agent serves as a precursor for swelling, then filtering, washing and drying are carried out, pillaring, filtering and drying are performed, then hydrolysis reaction is realized to form an inorganic wall and a mesoporous structure in the interlayer of the MWW high-silicon molecular sieve, re-filtering, re-washing and re-drying are carried out, and high-temperature calcination is carried out to obtain titanium-containing MCM-36 of a microporous-mesoporous composite structure. According to the invention, as a new silicone source and titanium source hybrid pillaring agent is used for pillaring to prepare the titanium-containing mesoporous pure titanium silicate molecular sieve, Bronsted acid site of boron or aluminium in the molecular sieve precursor is eliminated.

Description

technical field [0001] The invention relates to a catalyst, in particular to a layered mesoporous titanium-silicon molecular sieve catalyst used in the epoxidation or ammoxidation of carbon-carbon double bonds and at least one other functional group compound, and its preparation method and application. Background technique [0002] The MWW type molecular sieve has two mutually independent 10-membered ring channels, one of which contains a 12-membered ring supercage (0.71nm×1.81nm), and has a bowl-shaped hole on the surface of the crystal with an entrance of a 12-membered ring (Science , Science, 1994, 264:1910). This type of molecular sieve not only has a unique structure, but also has the characteristics of strong plasticity and modifiability due to its origin from layered precursors. MCM-22, a silica-alumina molecular sieve with a MWW structure synthesized by a hydrothermal method, has been used as a solid acid catalyst in the process of preparing ethylbenzene and cumene ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/89B01J35/10C07D303/04C07D301/19C07C251/44C07C249/08
Inventor 金放
Owner WUHAN INSTITUTE OF TECHNOLOGY
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