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Synthetic method of mfi zeolite containing rare earth

A synthesis method and rare earth technology, applied in the field of synthesis of MFI zeolite, can solve the problem of low rare earth content

Active Publication Date: 2018-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The technical problem to be solved by the present invention is the problem of low rare earth content in MFI zeolite crystals in the prior art

Method used

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  • Synthetic method of mfi zeolite containing rare earth
  • Synthetic method of mfi zeolite containing rare earth

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 2 grams of Magadiite with a silicon-aluminum ratio of 200 (molar ratio) and 30 milliliters of 1mol / L La(NO3) solution mixed, the mixture was stirred at room temperature for 18 hours, then washed, separated and dried to obtain a mixture containing La Magadiite material.

[0030] Mix 1.8 grams of the above-mentioned Magadiite material containing La with 0.0074 grams of sodium metaaluminate, 0.27 grams of NaOH, 1.04 grams of tetrapropylammonium bromide and 10 ml of water. After crystallization in the system for 48 hours, the crystallized product obtained becomes MFI zeolite containing rare earth after washing, separation, drying and roasting. Its XRD spectrum is as follows: figure 1 As shown, the La in the zeolite 2 o 3 The content is 24.5%.

Embodiment 2

[0032] 2 grams of Magadiite with a silicon-aluminum ratio of 200 (molar ratio) and 30 milliliters of 1mol / L La(NO3) solution mixed, the mixture was stirred at room temperature for 18 hours, then washed, separated and dried to obtain a mixture containing La Magadiite material.

[0033] Mix 1.8 grams of the above-mentioned Magadiite material containing La with 0.0074 grams of sodium metaaluminate, 0.27 grams of NaOH, 1.04 grams of tetrapropylammonium bromide and 10 ml of water. After crystallization in the system for 96 hours, the obtained crystallized product becomes a rare earth-containing MFI zeolite after washing, separation, drying and roasting, and its XRD pattern is consistent with that of figure 1 Similarly, the La in this zeolite 2 o 3 The content is 22.8%.

Embodiment 3

[0035] 2 grams of Magadiite with a silicon-aluminum ratio of 200 (molar ratio) and 30 milliliters of 1mol / L La(NO3) solution mixed, the mixture was stirred at room temperature for 18 hours, then washed, separated and dried to obtain a mixture containing La Magadiite material.

[0036] 1.8 grams of the above-mentioned Magadiite material containing La were uniformly mixed with 0.23 grams of NaOH, 1.04 grams of tetrapropylammonium bromide and 10 ml of water, and the resulting mixture was crystallized in a closed system at a temperature of 170 ° C for 48 hours to obtain The crystallized product of the crystallized product becomes the rare earth-containing MFI zeolite after washing, separation, drying and roasting, and its XRD pattern is consistent with that of figure 1 Similarly, the La in this zeolite 2 o 3 The content is 23.5%.

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Abstract

The invention relates to a synthesis method of rare earth-containing MFI zeolite, which mainly solves the problem of low rare earth content in the MFI zeolite crystal in the prior art. SiO2 in layered silicate material and aluminum source, template and alkali in water: Al2O3 in aluminum source: M2O in alkali source: template: H2O=1: (0~0.05): (0.05~0.25):(0.01~0.5):(10~100) are mixed in molar ratio, and the obtained initial sol is crystallized in a closed system at 130~200℃ for 20~120 hours, and the product is washed according to the conventional method After drying and roasting, the technical solution of rare earth-containing MFI zeolite is obtained, which better solves the technical problem and can be used in high-temperature catalytic reactions accompanied by water vapor.

Description

technical field [0001] The invention relates to a synthesis method of MFI type zeolite containing rare earth. Background technique [0002] The MFI zeolite represented by ZSM-5 has a unique pore structure and easy-to-regulate solid acid properties, so it is used in petrochemical processes such as catalytic cracking, alkylation, isomerization, disproportionation, dewaxing and etherification of hydrocarbons. has been widely applied. The earliest MFI type zeolite (ZSM-5) was invented by the original Mobil company in the early 1970s [USP 3702886]. They used expensive tetrapropyl ammonium hydroxide as a template to synthesize a lower silicon Aluminum ratio products. After decades of development, the synthesis method of MFI zeolite has been greatly improved [Cracking, 1997, 16, 53], such as the use of cheap alkylamines, cheap alcohols, and even without the use of organic The template agent also synthesized MFI zeolite [USP4151189, USP 4175114, EP 0042225, GB 1553209, CN 8510046...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/04
Inventor 袁志庆陶伟川滕加伟
Owner CHINA PETROLEUM & CHEM CORP
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