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

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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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 efficiency, pollutes the environment, but also wastes iodine resources, which also limits its industrial application

So far, there is no literature report on the preparation of highly active iodine-doped titanium dioxide nanocatalysts by the combined process of hydrothermal precrystallization and vacuum calcination, and its use to catalyze the configuration transformation of trans-carotenoids

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