Mesoporous molecular sieve catalyst, preparation method thereof and application thereof in preparing aldehyde ketone
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A mesoporous molecular sieve and catalyst technology, applied in the field of preparation of the catalyst, can solve the problems such as the inability to obtain high selectivity of aldehydes and ketones at the same time, the complex preparation process of the catalyst, and the unfavorable chemical industry production, etc. The effect of recovery and high catalyst activity
Inactive Publication Date: 2010-06-16
QIQIHAR UNIVERSITY
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[0004] The disadvantage of the above catalyst system is that the cost is relatively high, and under gas phase conditions, high selectivity of aldehydes and ketones cannot be obtained at the same time...
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Embodiment 1
[0020] Embodiment 1: Preparation of silver-containing HMS mesoporous molecular sieve catalyst
[0021] 30°C water bath, magnetic stirring, mix and dissolve 5.00g template dodecylamine, 72mL water and 41.46g absolute ethanol, stir until clear; add 0.80g silver nitrate, continue stirring for 2h to form a gel; Add 20.88g tetraethyl orthosilicate dropwise at a high speed, continue to stir for 24 hours at a temperature of 30°C; crystallize for 24 hours at a crystallization temperature of 30°C, filter, wash, dry, and roast at 550°C for 6 hours to remove the template agent, and granulate for 40~ 60 mesh, the obtained catalyst is recorded as: Ag(I)-HMS.
Embodiment 2
[0022] Embodiment 2: Preparation of silver-containing HMS mesoporous molecular sieve catalyst
[0023] The synthetic method of catalyst is as embodiment 1, selects silver sulfate, silver fluoride, silver perchlorate successively as silver source, and the synthesized catalyst is respectively marked as: Ag(II)-HMS, Ag(III)-HMS, Ag( IV) - HMS.
Embodiment 3
[0024] Embodiment 3: Preparation of silver-containing HMS mesoporous molecular sieve catalyst
[0025] The synthetic method of catalyzer is as embodiment 1, changes the add-on of silver nitrate, is successively: 3.40g, 1.70g, 0.68g, 0.34g, 0.17g, 0.09g, and gained catalyzer is respectively marked as: 1-Ag(I)- HMS, 2-Ag(I)-HMS, 3-Ag(I)-HMS, 4-Ag(I)-HMS, 5-Ag(I)-HMS, 6-Ag(I)-HMS.
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Abstract
The invention discloses a mesoporous molecular sieve catalyst, a preparation method thereof and application thereof in preparing aldehyde ketone by gas-phase catalytic selective oxidation of alcohols. The catalyst is marked as Ag-HMS, wherein the molar ratio of SiO2 to silver is 10-500. In the preparation method for the catalyst, a nonionic surfactant is taken as a template agent, tetraethoxysilane is taken as a silicon source and a water soluble silver salt is taken as a silver source. The catalyst has the advantages that: the silver is introduced, and the unique external circular platy particle feature and internal worm structure of the mesoporous molecular sieve HMS and the high dispersion and superhigh loading capacity of active components silver species are well maintained. The catalyst is applied to gas-phase catalytic selective oxidation of the alcohols, has high activity and good selectivity, and has the conversion rate for the alcohols of between 85 to 100 percent and the selectivity for the aldehyde ketone of over 96 percent which are much higher than those of the conventional related catalysts.
Description
technical field [0001] The invention relates to a mesoporous molecular sieve catalyst. The invention also relates to a preparation method of the catalyst. The invention also relates to the application of the catalyst in gas-phase catalytic selective oxidation of alcohols to prepare aldehydes and ketones. technical background [0002] The oxidation of alcohols to aldehydes and ketones plays an extremely important role in organic synthesis and is widely used in the synthesis of fine chemicals and organic intermediates. The world's annual production of carbonyl compounds exceeds 10 7 Ton, most of these compounds are derived from the oxidation of alcohols, therefore, converting alcohols into corresponding carbonyl compounds such as aldehydes and ketones through some simple and easy methods has very important application value and has been highly valued by chemical workers. . Carbonyl compounds are the products of alcohol oxidation. They are unstable under oxidation condition...
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