CN103464196A - Preparation method for immobilized Lewis acid - Google Patents

Preparation method for immobilized Lewis acid Download PDF

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CN103464196A
CN103464196A CN2013103171233A CN201310317123A CN103464196A CN 103464196 A CN103464196 A CN 103464196A CN 2013103171233 A CN2013103171233 A CN 2013103171233A CN 201310317123 A CN201310317123 A CN 201310317123A CN 103464196 A CN103464196 A CN 103464196A
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lewis acid
beta
preparation
molecular sieve
immobilized lewis
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郭庆祥
刘海峰
邓理
魏续瑞
廖兵
庞浩
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Guangzhou Chemical Co Ltd of CAS
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Guangzhou Chemical Co Ltd of CAS
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Abstract

The invention discloses a preparation method for immobilized Lewis acid, belonging to the field of catalysis in organic synthesis. The immobilized Lewis acid referred to in the invention comprises Sn-Beta, Ti-Beta, In-Beta, Cu-Beta, Zn-Beta, Cr-Beta, etc. Solid acid with activity of Lewis acid is prepared by reacting a salt solution of a metal with a dealuminated molecular sieve and then carrying out sintering. The invention has the following advantages: raw materials are cheap and easily available, a generation period is short, the preparation method has high yield, the immobilized Lewis acid is easy to separate, reaction conditions are simple, and the immobilized Lewis acid can be extensively applied in the Baeyer-Villiger oxidation reaction, a reaction for preparation of methyl lactate from 1,3-dioxyacetone or a reaction for preparation of fructose from glucose.

Description

Preparation method of immobilized Lewis acid
Technical Field
The invention belongs to the field of catalysis in organic synthesis, and particularly relates to a preparation method of immobilized Lewis acid.
Background
In recent years, with the progress of catalytic technology, it has become important to support a catalyst and to easily separate the catalyst from a substrate. In the case of the conventional acid-based catalysts,
Figure BDA00003567203300011
the immobilization of the acid is mature, and the sulfonic group is mainly connected with a loaded matrix through an alkyl chain. However, this method cannot be used in the synthesis process of Lewis acid, so the research on the immobilization technology of Lewis acid is laggard. Corma, Davis et al (Nature 2001,412:424-4·H2The molecular sieve (Sn-Beta) containing tin is obtained after hydrolysis and crystallization of O and the like, and has good Lewis acidity. However, this method requires a long preparation period (up to 40 days). Hermans et Al (Angew. chem. int. Ed.2012,51: 1-5) improved this process by using commercial H-Beta as the starting material, removing internal Al with nitric acid solution to form a voided Beta with a cavity, and then reacting it with Sn (CH)3COO)2Grinding and sintering in air atmosphere to obtain the Beta molecular sieve containing tin, which omits the crystallization process, greatly shortens the preparation period, but only limits the volatilizable Sn (CH)3COO)2Preparation of Sn-Beta, and Sn (CH)3COO)2The price is high, and the large-scale preparation is not suitable.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention mainly aims to provide a preparation method of immobilized Lewis acid. The preparation method has strong practicability and can be used for immobilized preparation of various metal Lewis acids.
The purpose of the invention is realized by the following technical scheme: a preparation method of immobilized Lewis acid comprises the following steps:
uniformly mixing 1 part by weight of H-Beta molecular sieve and 5-50 parts by weight of concentrated nitric acid with the concentration of 8-16 mol/L, stirring and reacting at 50-100 ℃ for 1-48H to remove aluminum in the molecular sieve, filtering, washing with water to be neutral, drying and removing water to obtain an aluminum-removed molecular sieve (deAlBeta); then adding 0.1-10 parts by weight of metal salt and 5-100 parts by weight of organic solvent, stirring for 10-48 h at 10-150 ℃ to enable the metal salt to diffuse into the deAlBeta, and then filtering, washing and roasting to obtain the immobilized Lewis acid containing the metal center.
The H-Beta molecular sieve is commercially available H-Beta molecular sieves of all kinds;
the metal salt is SnCl4,TiCl4,InCl3,CuCl2,ZnCl2,CrCl3Or FeCl3One of (1);
the organic solvent is one of methanol, ethanol, acetone, toluene, benzene, xylene, chloroform, carbon dichloride or ethyl acetate;
the washing is washing by using an organic solvent; the organic solvent is one of methanol, ethanol, acetone, toluene, benzene, xylene, chloroform, carbon dichloride or ethyl acetate;
the roasting is carried out for 1-20 h at 400-800 ℃ in an air atmosphere;
the process of the preparation method of the immobilized Lewis acid is shown as a formula I:
Figure BDA00003567203300021
solid Lewis acid
Formula I;
wherein,
Figure BDA00003567203300022
represents a commercially available H-Beta molecular sieve;
Figure BDA00003567203300023
represents a dealuminized molecular sieve;the supported Lewis acid containing a metal center is formed after metal salt diffusion, and M is one of Sn, Ti, In, Cu, Zn, Cr or Fe; the metal salt solution is formed by metal salt in an organic solvent; the metal salt is SnCl4,TiCl4,InCl3,CuCl2,ZnCl2,CrCl3Or FeCl3One of (1); the organic solvent is one of methanol, ethanol, acetone, toluene, benzene, xylene, chloroform, carbon dichloride or ethyl acetate.
The immobilized Lewis acid is prepared by the preparation method.
The immobilized Lewis acid obtained by the method can be applied to the reaction of activating carbonyl, wherein the reaction of activating carbonyl is Baeyer-Villiger oxidation reaction, the reaction of preparing methyl lactate from 1, 3-dihydroxyacetone and the reaction of preparing fructose from glucose.
Compared with the prior art, the invention has the following advantages: the raw materials of the method are cheap metal salt and organic solvent, not onlyLimited to Sn (CH)3COO)2The metal salt has wide applicability and solves the problem of preparation of immobilized Lewis.
Drawings
FIG. 1 is an energy spectrum of Sn-Beta in example 1.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
The parts mentioned in examples 1 to 10 are parts by weight.
Example 1
Synthesis of tin-containing molecular sieves (Sn-Beta): 1 part of hydrogen type beta molecular sieve (H-beta) and 20 parts of 13M nitric acid solution are mixed and heated to 100 ℃ for reaction for 20 hours. Filtering, washing with water to neutrality, drying and removing water to obtain the dealuminized molecular sieve (deAlBeta). Then adding into the solution 10 weight portions of anhydrous SnCl4100 parts of benzene (D), stirred at 25 ℃ for 24h, filtered and washed with 1000mL of benzene to remove free SnCl4And introducing air at 550 ℃ for activation for 3h, and cooling to obtain Sn-Beta.
Example 2
Synthesis of Ti-containing molecular sieve (Ti-Beta): 1 part of hydrogen type beta molecular sieve (H-beta) and 50 parts of 13M nitric acid solution are mixed and heated to 50 ℃ for reaction for 48 hours. Filtering, washing with water to neutrality, drying and removing water to obtain the dealuminized molecular sieve (deAlBeta). Then added to a solution of 0.1 part by weight of anhydrous TiCl45 parts of chloroform, stirred at 10 ℃ for 48 hours, filtered and washed with 500 parts of toluene to remove free TiCl4And introducing air to activate for 20h at 400 ℃, and cooling to obtain the Ti-Beta.
Example 3
Synthesis of In-containing molecular sieves (In-Beta): 1 part of hydrogen type beta molecular sieve (H-beta) is mixed with 50 parts of 8M nitric acid solution and then heated to 150 ℃ for reaction for 1 hour. Filtering, washing with water to neutrality, drying and removing water to obtain the dealuminized molecular sieve (deAlBeta). Then added to a solution of 10 parts by weight of anhydrous InCl 310 parts of methanol, stirred at 65 ℃ for 48h, filtered and washed with 500 parts of chloroform to remove free InCl3And introducing air for activation for 1h at 800 ℃, and cooling to obtain the In-Beta.
Example 4
Synthesis of Cu-containing molecular sieves (Cu-Beta): 1 part of hydrogen type beta molecular sieve (H-beta) is mixed with 50 parts of 10M nitric acid solution and then heated to 100 ℃ for reaction for 20 hours. Filtering, washing with water to neutrality, drying and removing water to obtain the dealuminized molecular sieve (deAlBeta). Then added to a solution of 5 parts by weight of anhydrous CuCl 250 parts of ethanol, stirring at 78 ℃ for 10h, filtering, washing with 500 parts of ethanol to remove free CuCl2And introducing air for activation for 2h at 700 ℃, and cooling to obtain the Cu-Beta.
Example 5
Synthesis of Zn-containing molecular sieves (Zn-Beta): 1 part of hydrogen type beta molecular sieve (H-beta) and 25 parts of 13M nitric acid solution are mixed and heated to 120 ℃ for reaction for 20 hours. Filtering, washing with water to neutrality, drying and removing water to obtain the dealuminized molecular sieve (deAlBeta). Then adding the mixture to a solution of 5 parts by weight of anhydrous ZnCl 250 parts of methanol, stirred at 65 ℃ for 48h, filtered and washed with 500 parts of methanol to remove free InCl3And introducing air for activation for 3h at the temperature of 600 ℃, and cooling to obtain Zn-Beta.
Example 6
Synthesis of Cr-containing molecular sieves (Cr-Beta): 1 part of hydrogen type beta molecular sieve (H-beta) is mixed with 50 parts of 8M nitric acid solution and then heated to 150 ℃ for reaction for 1 hour. Filtering, washing with water to neutrality, drying and removing water to obtain the dealuminized molecular sieve (deAlBeta). Then added into a solution of 10 parts by weight of anhydrous CrCl3100 parts of methanol, stirred at 65 ℃ for 48h, filtered and washed with 500 parts of methanol to remove free CrCl3And introducing air at 550 ℃ for activation for 4h, and cooling to obtain the Cr-Beta.
Example 7
Synthesis of Fe-containing molecular sieves (Fe-Beta): 1 part of hydrogen type beta molecular sieve (H-beta) is mixed with 50 parts of 8M nitric acid solution and then heated to 150 ℃ for reaction for 1 hour. Filtering, washing with water to neutrality, drying and removing water to obtain the dealuminized molecular sieve (deAlBeta). Then adding into a solution containing 10 parts by weight of anhydrous FeCl 310 parts of methanol, stirred at 65 ℃ for 48 hours, filtered and washed with 500 parts of methanol to remove free FeCl3And introducing air for activation for 20h at 500 ℃, and cooling to obtain Fe-Beta.
Example 8
Synthesis of tin-containing molecular sieves (Sn-Beta): 1 part of hydrogen type beta molecular sieve (H-beta) and 20 parts of 13M nitric acid solution are mixed and heated to 100 ℃ for reaction for 20 hours. Filtering, washing with water to neutrality, drying and removing water to obtain the dealuminized molecular sieve (deAlBeta). Then adding into a solution of 0.1 weight part of anhydrous SnCl45 parts of xylene, stirred at 140 ℃ for 24h, filtered and washed with 1000mL of xylene to remove free SnCl4And introducing air at 550 ℃ for activation for 3h, and cooling to obtain Sn-Beta.
Example 9
Synthesis of tin-containing molecular sieves (Sn-Beta): 1 part of hydrogen type beta molecular sieve (H-beta) and 20 parts of 13M nitric acid solution are mixed and heated to 100 ℃ for reaction for 20 hours. Filtering, washing with water to neutrality, drying and removing water to obtain the dealuminized molecular sieve (deAlBeta). Then adding into the solution 1 weight part of anhydrous SnCl4100 parts of ethyl acetate, stirred at 40 ℃ for 24h, filtered and washed with 1000mL of ethyl acetate to remove free SnCl4And introducing air at 550 ℃ for activation for 20h, and cooling to obtain Sn-Beta.
Example 10
Synthesis of tin-containing molecular sieves (Sn-Beta): 1 part of hydrogen type beta molecular sieve (H-beta) and 50 parts of 13M nitric acid solution are mixed and heated to 120 ℃ for reaction for 2 hours. Filtering, washing with water to neutrality, dryingWater to obtain a dealuminated molecular sieve (deAlBeta). Then adding into 9 parts by weight of anhydrous SnCl4100 parts of dichloro-benzene, stirred at 30 ℃ for 48h, filtered and washed with 1000mL of dichloromethane to remove free SnCl4And introducing air at 550 ℃ for activation for 20h, and cooling to obtain Sn-Beta.
The energy spectrum of Sn-Beta prepared in example 1 is shown in FIG. 1, and the data of the detection result is shown in Table 1, wherein the mass ratio of silicon to tin in the Sn-Beta molecular sieve is 37.87: 4.59.
TABLE 1 energy spectrum data of Sn-Beta of example 1
Figure BDA00003567203300051
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (9)

1. A preparation method of immobilized Lewis acid is characterized by comprising the following steps:
uniformly mixing 1 part by weight of H-Beta molecular sieve and 5-50 parts by weight of concentrated nitric acid with the concentration of 8-16 mol/L, stirring and reacting at 50-100 ℃ for 1-48H to remove aluminum in the molecular sieve, filtering, washing with water to be neutral, drying and removing water to obtain an aluminum-removed molecular sieve; then adding 0.1-10 parts by weight of metal salt and 5-100 parts by weight of organic solvent, stirring at 10-150 ℃ for 10-48 h to enable the metal salt to diffuse into the dealuminized molecular sieve, and then filtering, washing and roasting to obtain the immobilized Lewis acid containing the metal center.
2. The preparation method of the immobilized Lewis acid as claimed in claim 1, which is characterized in that: the H-Beta molecular sieve is a commercially available H-Beta molecular sieve.
3. The preparation method of the immobilized Lewis acid as claimed in claim 1, which is characterized in that: the metal salt is SnCl4,TiCl4,InCl3,CuCl2,ZnCl2,CrCl3Or FeCl3One kind of (1).
4. The preparation method of the immobilized Lewis acid as claimed in claim 1, which is characterized in that: the organic solvent is one of methanol, ethanol, acetone, toluene, benzene, xylene, chloroform, carbon dichloride or ethyl acetate.
5. The preparation method of the immobilized Lewis acid as claimed in claim 1, which is characterized in that: the washing is washing by using an organic solvent; the organic solvent is one of methanol, ethanol, acetone, toluene, benzene, xylene, chloroform, carbon dichloride or ethyl acetate.
6. The preparation method of the immobilized Lewis acid as claimed in claim 1, which is characterized in that: the roasting is carried out for 1-20 h at 400-800 ℃ in an air atmosphere.
7. An immobilized Lewis acid obtained by the preparation method of any one of claims 1 to 6.
8. Use of the immobilized Lewis acid of claim 7 in a reaction to activate a carbonyl group.
9. The use of the immobilized Lewis acid of claim 8 in a reaction to activate a carbonyl group, wherein: the activated carbonyl reaction is one of Baeyer-Villiger oxidation reaction, reaction for preparing methyl lactate from 1, 3-dihydroxyacetone or reaction for preparing fructose from glucose.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108097293A (en) * 2017-12-12 2018-06-01 南开大学 The synthetic method of the MFI structure zeolite molecular sieve of tin dope and application
CN108212207A (en) * 2018-03-23 2018-06-29 陕西师范大学 A kind of catalyzed conversion glucose prepares solid acid catalyst of methyl lactate and preparation method thereof
CN111905802A (en) * 2020-06-15 2020-11-10 厦门大学 Method for preparing lactate by using molybdenum-alkali metal/alkaline earth metal modified Lewis acid catalyst
CN112551538A (en) * 2020-12-23 2021-03-26 中触媒新材料股份有限公司 Synthesis method of nanoscale Sn-Beta
CN114229863A (en) * 2021-11-30 2022-03-25 中国矿业大学 Preparation method of Ti-Beta molecular sieve

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JP2009214039A (en) * 2008-03-11 2009-09-24 Tosoh Finechem Corp Solid lewis acid catalyst and manufacturing method of diels-alder adduct using this catalyst
CN101638455A (en) * 2009-03-06 2010-02-03 大连海事大学 Method for preparing petroleum resin by using supported AlCl3 catalyst

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108097293A (en) * 2017-12-12 2018-06-01 南开大学 The synthetic method of the MFI structure zeolite molecular sieve of tin dope and application
CN108212207A (en) * 2018-03-23 2018-06-29 陕西师范大学 A kind of catalyzed conversion glucose prepares solid acid catalyst of methyl lactate and preparation method thereof
CN111905802A (en) * 2020-06-15 2020-11-10 厦门大学 Method for preparing lactate by using molybdenum-alkali metal/alkaline earth metal modified Lewis acid catalyst
CN111905802B (en) * 2020-06-15 2022-01-18 厦门大学 Method for preparing lactate by using molybdenum-alkali metal/alkaline earth metal modified Lewis acid catalyst
CN112551538A (en) * 2020-12-23 2021-03-26 中触媒新材料股份有限公司 Synthesis method of nanoscale Sn-Beta
CN114229863A (en) * 2021-11-30 2022-03-25 中国矿业大学 Preparation method of Ti-Beta molecular sieve
CN114229863B (en) * 2021-11-30 2023-01-13 中国矿业大学 Preparation method of Ti-Beta molecular sieve

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