Hydrothermal preparation method for iodine-doped TiO2 nano-catalyst and application thereof in catalysis of trans-carotene configuration inversion

A nano-catalyst, iodine-doped technology, applied in chemical instruments and methods, physical/chemical process catalysts, isomerization hydrocarbon production, etc., can solve the problems of limited industrial application, long preparation process cycle, low degree of crystallization, etc. To achieve the effect of easy recycling, lower production costs, and stable catalytic activity

Active Publication Date: 2015-04-29
上海植营生物科技有限公司
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Problems solved by technology

However, the preparation method of the iodine-doped titania nanocatalyst has disadvantages such as low crystallization degree of the product, poor thermal stability, high raw material cost, long preparation process cycle and environmental protection problems caused by difficult solvent recovery, which lead to the failure of the catalyst. The preparation not only has low production effi

Method used

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  • Hydrothermal preparation method for iodine-doped TiO2 nano-catalyst and application thereof in catalysis of trans-carotene configuration inversion
  • Hydrothermal preparation method for iodine-doped TiO2 nano-catalyst and application thereof in catalysis of trans-carotene configuration inversion
  • Hydrothermal preparation method for iodine-doped TiO2 nano-catalyst and application thereof in catalysis of trans-carotene configuration inversion

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Embodiment 1

[0041] (1) At normal temperature, 200mg Kl and 4mg polyvinylpyrrolidone were added to 20mL deionized pure water, and mixed uniformly to obtain mixture A;

[0042] (2) Add 0.5 mL of acetic acid to 10 mL of tetrabutyl titanate (10 g in total), and mix well to obtain mixture B;

[0043] (3) Slowly add the mixture B to the mixture A under the conditions of room temperature and vigorous stirring, and continue to stir for 2 hours after the addition is completed;

[0044] (4) Place the reaction solution in step (3) in a container of a hydrothermal reaction kettle, react at a temperature of 80° C. and a time of 12 hours, and centrifuge the reaction solution to obtain titanium dioxide precipitation;

[0045] (5) After drying the titanium dioxide precipitate obtained in step (4) at 60° C. and a vacuum degree of 0.1 MPa for 12 hours, grind it into titanium dioxide powder for the first time;

[0046] (6) Calcining the titanium dioxide powder obtained in the step (5) at a vacuum degree of...

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Abstract

The invention relates to a hydrothermal preparation method for an iodine-doped TiO2 nano-catalyst and an application thereof in heterogeneous catalysis of trans-carotene configuration inversion. The preparation method is characterized in that the high-activity iodine-doped TiO2 nano-catalyst is rapidly prepared by adopting a hydrothermal pre-crystallization and vacuum roasting combined process, namely, firstly TiO2 nanoparticles are prepared by using a hydrothermal method, and then the iodine-doped TiO2 nano-catalyst is prepared by adopting a vacuum drying-vacuum roasting process. According to the catalyst prepared by the method, compared with the iodine-doped TiO2 nano-catalyst prepared by the conventional sol-gel method, the crystallization degree is obviously improved, the thermal stability is greatly improved, the period of the preparation process is greatly shortened, and the use amount of the organic solvent is greatly reduced. The catalyst has high activity in catalyzing inversion from all-trans-carotene into cis-isomers thereof, and has the advantages of short inversion time, high inversion efficiency, stable catalytic activity, repeated utilization and the like.

Description

technical field [0001] The present invention relates to a preparation method of a nanocatalyst and its use for heterogeneously catalyzing the configuration transformation of trans-carotenoids, in particular to a method for rapidly preparing high-activity iodine-doped titanium dioxide by using a hydrothermal precrystallization-vacuum roasting combined process A method of nanocatalysts for the conversion of trans-configured carotenoids to cis-configured carotenoids. The invention belongs to the technical field of inorganic nanometer catalytic material and health food production. Background technique [0002] Carotenoids are a class of compounds with special physiological and pharmacological functions, which play an important role in human health. Under the steric hindrance effect of methylation, the conjugated double bonds in carotenoid molecules cannot be rotated arbitrarily, so carotenoids have a much lower number of spatial isomers than the theoretical number. Common lyco...

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Application Information

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IPC IPC(8): B01J27/135C07C403/24C07C11/21C07C5/22
Inventor 张连富孙清瑞闫红晓
Owner 上海植营生物科技有限公司
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