CN102139224A - Catalyst for low-temperature gaseous phase synthesis of benzaldehyde and preparation method thereof - Google Patents
Catalyst for low-temperature gaseous phase synthesis of benzaldehyde and preparation method thereof Download PDFInfo
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- CN102139224A CN102139224A CN 201010610138 CN201010610138A CN102139224A CN 102139224 A CN102139224 A CN 102139224A CN 201010610138 CN201010610138 CN 201010610138 CN 201010610138 A CN201010610138 A CN 201010610138A CN 102139224 A CN102139224 A CN 102139224A
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Abstract
The invention discloses a catalyst for low-temperature gaseous phase synthesis of benzaldehyde and a preparation method thereof. The molecular formula of the catalyst is M-Ag-HMS, wherein M is alkali metal, alkaline earth metal or rare earth metal element. The preparation method comprises the following steps of: dissolving primary amine RN serving as a template agent into absolute ethanol to obtain primary amine ethanol solution; preparing mixed solution of silver and potassium nitrate, adding the mixed solution into the primary amine ethanol solution, stirring the solution uniformly till a colloidal material is produced, dripping ethyl orthosilicate into the colloidal material with violent stirring, continuously stirring the colloidal material till sediment is generated, and performing crystallization, filtration, washing, drying, roasting, tabletting and screening to obtain the catalyst. The catalyst has the advantages of high catalytic activity, strong selectivity, simple synthesis process, stable structure and long life; when the catalyst is filled in a fixed bed reaction kettle to synthesize benzaldehyde by gaseous phase catalytic oxidation of benzyl alcohol, the reaction conditions are mild, the purity of the product is high, and the costs of separation and purification are reduced; and the catalyst is easy for reclamation and regeneration.
Description
Technical field
The present invention relates to a kind of catalyst that is used for low temperature gas phase synthesizing benzaldehyde, be a kind of composite modified HMS type catalyst.The invention still further relates to this Preparation of catalysts method.
Background technology
Benzaldehyde is a kind of important fine chemicals and organic intermediate, is widely used in fields such as pharmacy, dyestuff, cosmetics and Polymer Synthesizing.Benzaldehyde (carbonyls) is the product of pure oxidation, and is unstable under oxidizing condition, often continued the easier oxidation of oxidation, especially aldehyde and generates carboxylic acid.Therefore, pure selective oxidation is that aldehyde is one and has challenging problem, and the exploitation high selectivity, pure method for oxidation more and more receives publicity efficiently.At present, with H
2O
2, O
2Or air is as cleaning oxidizer, reaction system is mainly liquid phase homogeneous phase and heterogeneous oxidation, and water/organic biphasic catalysis, reacting employed catalyst mainly concentrates on Ru, Pd, Ag, Cu even load molecular sieve or other carriers, metals such as Co, Ni, Pt also have some reports in addition, and are less for the research report of gas-solid heterogeneous catalytic oxidation.
Disclose the selective oxidation of a kind of phenmethylol gas phase catalysis among the CN101733145A and prepared method of benzaldehyde, for the catalyst direct oxidation gets benzaldehyde, 320 ℃ of phenmethylol conversion ratios reach more than 85 % with Ag-HMS, and the benzaldehyde selectivity can reach more than 96 %.
People such as Mao (Catalysis Communications, 2009,10:1376-1379) reported the application of a kind of Ag-Ni optical fiber catalyst in catalytic gas phase oxidation phenmethylol producing benzaldehyde.The conversion ratio of 380 ℃ of phenmethylols is 84 %, and the selectivity of benzaldehyde reaches 94 %.
People such as Xu (ChemCatChem, 2010,2:383-386) reported a kind of carrier-free nanoporous Au catalyst, be used for the catalytic gas phase oxidation phenmethylol and prepare benzaldehyde.Conversion ratio 58.1 % of 240 ℃ of phenmethylols, the benzaldehyde selectivity is 95.1 %.
(J. Am. Chem. Soc. 2009 131:15568-15569) has reported mesoporous K-Cu-TiO to people such as Galen D.Stucky
2The application of catalyst in catalytic gas phase oxidation phenmethylol producing benzaldehyde.The author adopts the method for dipping to make catalyst, and under 203～223 ℃ temperature, the phenmethylol conversion ratio reaches 72 %, and the benzaldehyde selectivity is greater than 98 %.When reaction temperature was elevated to 240 ℃, the selectivity of benzaldehyde obviously descended, and at this moment had a large amount of benzoic acid to generate.
People such as Sawayama (Ind Eng Chem Res, 2006,45:8837-8845) reported the application of Ag supported catalyst in catalytic gas phase oxidation phenmethylol producing benzaldehyde.The author has synthesized different carriers (SiO with infusion process
2/ CaO) Ag supported catalyst, and K/Ag/SiO on this basis
2Catalyst.System thinking the influence of catalyst sintering temperature, reaction time and reaction temperature to catalyst activity.Reaction yield is up to 84.2 %.
The shortcoming of these catalyst systems is respectively that reaction temperature is higher, and during relatively lower temp, phenmethylol can not obtain the benzaldehyde of high selectivity in high conversion under gas phase condition.
It is 200910073370.7 applications for a patent for invention that the applicant has also submitted application number to State Intellectual Property Office on December 2nd, 2009, theme as a kind of mesoporous molecular sieve catalyst, disclosed Ag-HMS mesoporous molecular sieve catalyst is introduced silver-colored active component by original position in the process of synthetic HMS mesopore molecular sieve and is made.Though this catalyst reaches 85%～100% to the conversion ratio of alcohol, can reach 96% to the selectivity of aldehyde ketone, exist the reaction temperature problem of higher too.The present invention is on this technical foundation, at improving in the process of low temperature gas phase synthesizing benzaldehyde the conversion ratio of alcohol and the continuation research that the selectivity problem of aldehyde ketone is carried out.
Summary of the invention
The object of the invention is to provide a kind of catalyst that is used for low temperature gas phase synthesizing benzaldehyde, and another goal of the invention of the present invention is to provide a kind of this Preparation of catalysts method.Catalyst of the present invention has the catalytic activity height, and selectivity is strong, Stability Analysis of Structures, advantages such as life-span length.
The present invention is used for the catalyst of low temperature gas phase synthesizing benzaldehyde, and its molecular formula is: M-Ag-HMS, M wherein are alkali metal, alkaline-earth metal or thulium.
The above-mentioned Preparation of catalysts method of the present invention comprises:
(1) adopting nonionic surface active agent primary amine RN is the template agent, and it is dissolved in absolute ethyl alcohol, gets the primary amine ethanolic solution, and wherein the R among the nonionic primary amine RN is the alkyl of 4～24 carbon atoms,
(2) preparation silver, kentite hydrochlorate mixed solution add this mixed solution in the above-mentioned primary amine ethanolic solution, stir to jelly occurring,
(3) under strong agitation, ethyl orthosilicate is added dropwise in the above-mentioned jelly, continue to be stirred to sediment and generate, crystallization 12～24 h, filtration, washing, oven dry, roasting, compressing tablet, screening make catalyst.
The mole ratio of components of above-mentioned catalyst raw material is:
SiO
2 :Ag
2 O:RN:ETOH:H
2 O:K==1:0.01～0.1:0.27:4～10:40～80:0.04～0.8。
Advantage of the present invention is that catalytic activity height, selectivity are strong, and synthesis technique is simple, Stability Analysis of Structures, and the life-span is long; Catalyst is loaded on the fixed bed reaction still is used for catalytic gas phase oxidation phenmethylol synthesizing benzaldehyde, the reaction condition gentleness, the product purity height reduces and separates the cost of purifying; Catalyst is easy to reclaim, regeneration.
The specific embodiment
Embodiment 1
With 5.00 g template agent lauryl amines and 41.46 g absolute ethyl alcohol mixed dissolutions, 30 ℃ of water-baths, magnetic agitation is to clarification; To add 0.68 g silver nitrate in the above-mentioned solution, 0.809 g potassium nitrate, the mixed solution of 72 mL deionized waters preparation continues to stir a period of time agglutination; Rate of titration with 0.45 mL/min drips 20.88 g ethyl orthosilicates then, continues to stir 24 h, and reaction temperature is 30 ℃; Crystallization 24 h, crystallization temperature are 30 ℃, filter, and washing, oven dry, 550 ℃ of roasting 6 h remove the template agent.The catalyst note is done: K-Ag-HMS-1.
Embodiment 2
With 5.00 g lauryl amines, 0.68 g silver nitrate, 0.809 g potassium nitrate, 41.46 g absolute ethyl alcohols and 72mL deionized water mixed dissolution, 30 ℃ of water-baths, magnetic agitation is to jelly occurring; Rate of titration with 0.45 mL/min drips 20.88 g ethyl orthosilicates then, continues to stir 24 h, and reaction temperature is 30 ℃; Crystallization 24 h, crystallization temperature are 30 ℃, filter, and washing, oven dry, 550 ℃ of roasting 6 h remove the template agent.The catalyst note is done: K-Ag-HMS-2.
Embodiment 3
The catalyst that embodiment 1 is obtained, through compressing tablet, screening, choosing 40～60 orders is catalyst, adopt atmospheric fixed bed reactor catalytic gas phase oxidation phenmethylol synthesizing benzaldehyde, 40～60 purpose catalyst K/Ag-HMS are mixed a certain amount of 40～60 purpose quartz sands, the reactor of packing into, catalyst amount is 0.5 g, N
2Flow is 38 mL/min, O
2Flow 13mL/min, the phenmethylol charging rate is 0.10mL/min, and reaction temperature is 215～220 ℃, and the reaction time is 2h.Cryosel is bathed (10～-15 ℃) and is collected gas-phase product and unreacted phenmethylol, by the FID gas-chromatography collected product is analyzed; The phenmethylol conversion ratio is 94.71%, and the benzaldehyde selectivity is 97.56%.
Reaction temperature is 320 ℃, and the reaction time is 2 h, and the phenmethylol conversion ratio is 64.11 %, and the benzaldehyde selectivity is 95.53 %.
Embodiment 4
The catalyst that embodiment 2 is obtained, through compressing tablet, screening, choosing 40～60 orders is catalyst, adopt atmospheric fixed bed reactor catalytic gas phase oxidation phenmethylol synthesizing benzaldehyde, 40～60 purpose catalyst K/Ag-HMS are mixed a certain amount of 40～60 purpose quartz sands, the reactor of packing into, catalyst amount is 0.5 g, N
2Flow is 38 mL/min, O
2Flow 13 mL/min, the phenmethylol charging rate is 0.10 mL/min, and reaction temperature is 215～220 ℃, and the reaction time is 2 h.Cryosel is bathed (10～-15 ℃) and is collected gas-phase product and unreacted phenmethylol, by the FID gas-chromatography collected product is analyzed; The phenmethylol conversion ratio is 74.71 %, and the benzaldehyde selectivity is 95.26 %.
Reaction temperature is 320 ℃, and the reaction time is 2 h, and the phenmethylol conversion ratio is 69.11 %, and the benzaldehyde selectivity is 92.14 %.
Claims (3)
1. catalyst that is used for low temperature gas phase synthesizing benzaldehyde, molecular formula is: M-Ag-HMS, M wherein are alkali metal, alkaline-earth metal or thulium.
2. Preparation of catalysts method that is used for low temperature gas phase synthesizing benzaldehyde according to claim 1:
(1) adopting nonionic surface active agent primary amine RN is the template agent, and it is dissolved in absolute ethyl alcohol, gets the primary amine ethanolic solution, and wherein the R among the nonionic primary amine RN is the alkyl of 4～24 carbon atoms,
(2) preparation silver, kentite hydrochlorate mixed solution, wherein K/Ag is 0.1～20, and this mixed solution is added in the above-mentioned primary amine ethanolic solution, stir to jelly occurring,
(3) under strong agitation, ethyl orthosilicate is added dropwise in the above-mentioned jelly, continue to be stirred to sediment and generate, crystallization 12～24 h, filtration, washing, oven dry, roasting, compressing tablet, screening make catalyst.
3. according to the described Preparation of catalysts method that is used for low temperature gas phase synthesizing benzaldehyde of claim 2: the mole ratio of components of described catalyst raw material is:
SiO
2:Ag
2O:RN:ETOH:H
2O:K==1:0.01～0.1:0.27:4～10:40～80:0.04～0.8。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103497093A (en) * | 2013-09-30 | 2014-01-08 | 齐齐哈尔大学 | Method for preparing benzaldehyde through low-temperature gas-phase selective catalytic oxidation of benzyl alcohol |
| CN108452799A (en) * | 2018-05-10 | 2018-08-28 | 北京化工大学 | A kind of preparation method of loading type silver catalyst and its application of catalytic phenylmethanol anaerobic dehydrogenation producing benzaldehyde |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101733145A (en) * | 2009-12-02 | 2010-06-16 | 齐齐哈尔大学 | Mesoporous molecular sieve catalyst, preparation method thereof and application thereof in preparing aldehyde ketone |
| CN101773846A (en) * | 2009-01-14 | 2010-07-14 | 常州化学研究所 | Loaded solid alkali zeolite catalyst for synthesizing long-chain alkyl carbonate |
-
2010
- 2010-12-29 CN CN 201010610138 patent/CN102139224B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101773846A (en) * | 2009-01-14 | 2010-07-14 | 常州化学研究所 | Loaded solid alkali zeolite catalyst for synthesizing long-chain alkyl carbonate |
| CN101733145A (en) * | 2009-12-02 | 2010-06-16 | 齐齐哈尔大学 | Mesoporous molecular sieve catalyst, preparation method thereof and application thereof in preparing aldehyde ketone |
Non-Patent Citations (2)
| Title |
|---|
| 《Ind. Eng. Chem. Res.》 20061129 Yo-suke Sawayama et al. Promoting Effect and Role of Alkaline Earth Metal Added to Supported Ag Catalysts in the Gas-Phase Catalytic Oxidation of Benzyl Alcohol 第8837-8845页 1-3 第45卷, 第26期 * |
| 《Journal of Catalysis》 20050810 Ryohei Yamamoto et al. Promoted partial oxidation activity of supported Ag catalysts in the gas-phase catalytic oxidation of benzyl alcohol 第308-317页 1-3 第234卷, * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103497093A (en) * | 2013-09-30 | 2014-01-08 | 齐齐哈尔大学 | Method for preparing benzaldehyde through low-temperature gas-phase selective catalytic oxidation of benzyl alcohol |
| CN103497093B (en) * | 2013-09-30 | 2015-11-11 | 齐齐哈尔大学 | The method of phenyl aldehyde prepared by a kind of low-temperature gaseous phase selective catalytic oxidation phenylcarbinol |
| CN108452799A (en) * | 2018-05-10 | 2018-08-28 | 北京化工大学 | A kind of preparation method of loading type silver catalyst and its application of catalytic phenylmethanol anaerobic dehydrogenation producing benzaldehyde |
| CN108452799B (en) * | 2018-05-10 | 2021-06-22 | 北京化工大学 | Preparation method of supported silver catalyst and application of supported silver catalyst in preparation of benzaldehyde by catalyzing anaerobic dehydrogenation of benzyl alcohol |
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Inventor after: Jia Lihua Inventor after: Zhang Xueju Inventor after: Guo Xiangfeng Inventor after: Guo Jiefu Inventor before: Jia Lihua Inventor before: Zhang Xueju Inventor before: Guo Xiangfeng |
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