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Titanium-silicon molecular sieve, preparation method and application thereof, and propylene epoxidation method

A technology of titanium-silicon molecular sieve and propylene, which is applied in the field of molecular sieves, can solve problems such as poor catalytic effect, achieve the effects of improving selectivity, low price, and reducing production costs

Active Publication Date: 2019-09-24
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect of poor catalytic effect of titanium-silicon molecular sieves in the prior art, to provide a titanium-silicon molecular sieve, its preparation method and application, and a method for propylene epoxidation

Method used

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  • Titanium-silicon molecular sieve, preparation method and application thereof, and propylene epoxidation method
  • Titanium-silicon molecular sieve, preparation method and application thereof, and propylene epoxidation method
  • Titanium-silicon molecular sieve, preparation method and application thereof, and propylene epoxidation method

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Embodiment approach

[0028] According to a preferred embodiment of the present invention, a:c is in the range of 4-10:1, and b:c is in the range of 2-3:1.

[0029] According to a most preferred embodiment of the present invention, the thickness of the crystal grains of the titanium-silicon molecular sieve is 600-1200 nm, a:c is in the range of 4-10:1, and b:c is in the range of 2-3:1. The titanium-silicon molecular sieve grains of this preferred embodiment are not only thinner but also smaller in size, and when used in the propylene epoxidation process, have higher catalytic activity and selectivity of target products.

[0030] According to the titanium silicon molecular sieve of the present invention, preferably, the molar ratio of silicon element: titanium element is 1: (0.01-0.5), more preferably silicon element: the molar ratio of titanium element is 1: (0.01-0.3), most preferably 1: (0.01-0.03). In the present invention, X-ray fluorescence spectrometry (XRF) is used to measure the content of...

specific Embodiment approach

[0046] According to a specific embodiment of the present invention, the method further includes filtering and washing after hydrothermal crystallization to obtain the solid product described in step (2). The solid is dried or not dried and then calcined, preferably dried and then calcined.

[0047] According to a specific embodiment of the present invention, the drying conditions include: a temperature of 80-150° C., preferably 100-120° C., and a time of 4-24 hours, preferably 10-16 hours.

[0048] According to the method provided by the present invention, preferably, the roasting conditions include: a temperature of 400-700° C., preferably 500-650° C., and a time of 1-8 hours, preferably 3-6 hours.

[0049] The third aspect of the present invention provides the titanium-silicon molecular sieve prepared by the above-mentioned preparation method. The grains of the titanium-silicon molecular sieve obtained by the above preparation method are plate-shaped, and the thickness of t...

Embodiment 1

[0059] Put 30g of deionized water into the pressure vessel, then mix 10.4g of ethyl orthosilicate, 2g of tetrapropylammonium bromide and 10g of urea evenly, stir at room temperature (25°C) for 0.5h, and then Add 2.4g of titanium sulfate, and mix uniformly to obtain a mixture (pH value of 9.3). Place it in a closed stainless steel reaction kettle, and keep it under autogenous pressure at 200°C for 20h. The sample was taken out, filtered and washed, dried at 120°C for 12 hours, and calcined at 550°C for 5 hours to obtain TS-1 molecular sieve powder, which was named T-1. The molecular sieve was analyzed by XRF, SEM and XRD, and the titanium and silicon elements are listed in Table 1. SEM picture as figure 1 shown, from figure 1 It can be seen from the figure that the grain size is relatively uniform, and it is plate-shaped. The thickness of the grain and the values ​​of a:c and b:c are listed in Table 1. XRD spectrum as image 3 shown, from image 3 It can be seen that the T...

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Abstract

The invention relates to the field of molecular sieves, and discloses a titanium-silicon molecular sieve, a preparation method and an application thereof, and a propylene epoxidation method. In the SEM image of the titanium-silicon molecular sieve, the crystal grains of the titanium-silicon molecular sieve have a plate-shaped shape, the thickness of the crystal grains of the titanium-silicon molecular sieve is 500-5000 nm, and the crystal grains of the titanium-silicon molecular sieve meet the following conditions: the ratio of a:c is (2-10):1, and the ratio of b:c is (1-5):1, wherein a represents the length of the crystal grains, b represents the width of the crystal grains, and c represents the thickness of the crystal grains. The preparation method of the titanium-silicon molecular sieve comprises the following steps: (1) contacting a silicon source, a titanium source, tetrapropylammonium bromide, an alkali source and water to obtain a mixture; and (2) hydrothermally crystallizing the mixture, drying or not drying a solid product obtained by hydrothermal crystallization, and calcining the solid product. The molecular sieve can improve the catalytic activity and selectivity of molecular sieves when used for the propylene epoxidation process, and the method can effectively reduce the production cost.

Description

technical field [0001] The invention relates to the field of molecular sieves, in particular to a titanium-silicon molecular sieve, a preparation method and application thereof, and a propylene epoxidation method. Background technique [0002] Titanium-silicon molecular sieve TS-1 was obtained by hydrothermal synthesis for the first time in 1983 by Taramasso et al. It has an MFI-type topological framework structure and belongs to the orthorhombic crystal system. Its three-dimensional channel structure is composed of elliptical straight channels and "Z"-shaped channels. The average pore diameter is about 0.55nm. TS-1 molecular sieve has excellent catalytic oxidation activity, especially in the 2 o 2 The participating reactions show good shape selection and environment-friendly characteristics, which lay a good foundation for the research of hydrocarbon oxidation reactions and the development of environment-friendly processes. [0003] In the traditional synthesis method of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/08B01J29/89C07D301/12C07D303/04
CPCB01J29/89C01B39/085C01P2004/20C07D301/12C07D303/04
Inventor 杨虹田大勇缪平孙琦
Owner CHNA ENERGY INVESTMENT CORP LTD
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