Method for preparing porous manganese oxide catalyst

Abstract

The invention relates to a preparation technology of a catalytic material, and aims to provide a method for preparing a porous manganese oxide catalyst. The method comprises the following steps: carrying out foaming treatment by using manganese salt, a hydrate of the manganese salt or an aqueous solution of the manganese salt as a precursor and a lipid polymer prepared from organic acid and alcohols in situ as a foaming agent, uniformly stirring after mixing the precursor, the organic acid, the alcohols used for carrying out esterification reaction with acid, the water and ethanol which is used as a solvent according to a mass ratio of 10 to 10 to 10 to 30 to 30, and heating and stirring under 50 to 170 DEG C until expanding and foaming; carrying out drying and roasting treatment on a thick colloidal-state matter obtained through foaming, thus obtaining the porous manganese oxide catalyst. The porous manganese oxide catalyst prepared by the invention has a porous structure and has excellent performance aiming at C-H bond activation reaction. Even under a solvent-free condition, the porous manganese oxide catalyst prepared by the invention is still capable of realizing efficient activated oxidation on ethylbenzene C-H bonds.

Description

technical field [0001] The invention relates to a preparation technology of catalytic materials, in particular to a method for preparing a porous manganese oxide catalyst. Background technique [0002] Nowadays, in most industrial and fine chemical production processes, it is of great significance to obtain high value-added products through the catalytic oxidation of saturated C–H bonds. In many catalytic systems, molecular oxygen is used to achieve efficient and high selectivity for sp 3 The catalytic oxidation of the C–H bond is a key challenge, because the inertness of the C–H bond generally requires a high operating temperature and a huge energy consumption (for example, the dehydrogenation of propane requires 400~ at 700°C). The use of molecular oxygen as an oxidant also often causes over-oxidation, resulting in low product selectivity and easy carbon deposition. Therefore, catalytic materials with better catalytic performance are designed and prepared to achieve effi...

AI Technical Summary

Problems solved by technology

However, due to the low specific surface area of ​​existing manganese oxide catalysts, the activity in many reactions is still difficult to meet the demand.