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US 12,741,268 B2Granted
Composite catalyst and use thereof in preparing propylene glycol
AssigneeTongji University
InventorsZheng Shen, Yalei Zhang, Minyan Gu
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Abstract
The present application provides a composite catalyst and use thereof in preparing propylene glycol, where the composite catalyst includes: a main catalyst; and an assistant catalyst, forming on the main catalyst; the assistant catalyst is a magnesium hydroxide shell with a cage-like shape forming on the surface of the main catalyst, and the main catalyst is located inside the magnesium hydroxide shell.
Claims16
A composite catalyst, comprising:
- a main catalyst;
- and
- an assistant catalyst, formed on the main catalyst;
- wherein the assistant catalyst is a magnesium hydroxide shell with a cage-like shape on the surface of the main catalyst, and the main catalyst is located inside the magnesium hydroxide shell;
- wherein the composite catalyst has a number of basic sites of 0.028-3.14 mmol/g.
2 more elements
A method for preparing propylene glycol, comprising:
- mixing a sugar, a main catalyst, and an assistant catalyst in a reactor, then adding a solvent to form a reaction mixture;
- performing a hydrothermal reaction in the reactor under a reducing gas atmosphere to obtain the propylene glycol;
- wherein the assistant catalyst is a magnesium hydroxide shell with a cage-like shape formed on the surface of the main catalyst, and the main catalyst is located inside the magnesium hydroxide shell to form a main catalyst-assistant catalyst composite catalyst with catalytic activity;
- wherein the reactor comprises a tank reactor or a fixed bed reactor;
- wherein the sugar in a tank reactor comprises one or more selected from glucose, sucrose, fructose, trehalose, maltose, starch, and cellulose;
- wherein the sugar in a fixed bed reactor comprises one or more selected from glucose, sucrose, fructose, trehalose, and maltose.
3 more elements
Dependencies are inferred from the claim text.