Palladium catalyst loaded by mesoporous carbon as well as preparation method and application thereof

Abstract

The invention relates to a palladium catalyst loaded by mesoporous carbon. The content of metal palladium in the catalyst is 1-5%, and the carrier is mesoporous carbon. The palladium catalyst loaded by mesoporous carbon has large activity superficial area; and in the presence of solvent, phytosterol is prepared from unsaturated phytosterol through catalysis and hydrogenation. In the invention, the used reaction temperature and the pressure of hydrogen are low, the consumption of the catalyst is less, the required reaction time is short, the cheap mesoporous carbon is used as a carrier, the catalyst cost is lowered, and the precious metal components in the catalyst is convenient to recycle; and under the condition of optimizing, the conversion rate of sterol is nearly 100%.

Description

technical field [0001] The present invention relates to a kind of catalyst, particularly a kind of palladium catalyst supported by mesoporous carbon, the present invention also relates to the preparation method and application of the catalyst; the present invention also relates to the catalytic hydrogenation preparation method of sitostanol using the catalyst . Background technique [0002] Phytosterols (including sterols and stanols) are receiving increasing attention as cholesterol-lowering ingredients in food additives. After taking this natural plant ingredient, the level of low-density lipoprotein cholesterol in human serum can be significantly reduced, reducing the incidence of coronary heart disease and atherosclerosis. Some studies suggest that sitosterol, which is not actually absorbed by the body, is more effective than sitosterol in inhibiting cholesterol absorption and lowering cholesterol concentrations. Moreover, the molecular structure of sitosterol does not...

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Problems solved by technology

[0004] Although the catalytic hydrogenation of sitosterol or stigmasterol reported in the literature can usually obtain higher stanol yields and the conditions are relatively mild, the reaction time is still long, and the catalytic activity of the palladium catalyst needs to be improved.

On the other hand, it is necessary to point out that the pore size of the catalyst will affect the diffusion of the reactant species in the pores. Since the sterol molecules are relatively large, it is difficult to enter the smaller pores and contact with the active Pd loaded in the pores, so that This part of active Pd does not play a catalytic role in the reaction, which reduces the effective utilization of Pd

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