Magnetic superfine solid acid catalyst in double-shell structure and its prepn process

Abstract

The catalyst features that magnetic nucleus is coated with high-specific surface area carrier to form carrier with magnetic nucleus and the carrier with magnetic nucleus is further coated with one layer of strong solid acid. The catalyst is prepared through sol-gel process, in which magnetic nucleus Fe3O4, Co-Fe3O4, Mn-Fe3O4 or Ni-Fe3O4 is coated with high-specific surface area carrier SiO2, ZrO2, Al2O3, TiO2, etc. to form carrier with magnetic nucleus; and subsequent soaking process, in which strong solid acid Zr(SO4)2, SO42--ZrO2, F-ZrO2, etc. is dispersed to the surface of the carrier with magnetic nucleus. This kind of solid acid catalyst in double-shell structure is mainly used in acid catalytic reaction, and features magnetism and high catalytic activity.

Description

Technical field:

[0001] The invention relates to a double shell structure magnetic solid acid catalyst and a preparation method thereof. Background technique:

[0002] At present, when studying solid acid catalysts at home and abroad, we often encounter the problem that ultrafine catalyst particles are difficult to separate and recycle. In view of this situation, our laboratory and Harbin Engineering University jointly proposed the idea of ​​endowing the catalyst with magnetism and using an external magnetic field to separate it. In the patent application 00133474.3, the ZrO 2 Coated in Fe 3 o 4 Externally prepared ZrO 2 / Fe 3 o 4 Magnetic solid acid catalyst, Zr(SO 4 ) 2 4H 2 O and Fe 3 o 4 Zr(SO 4 ) 2 / Fe 3 o 4 Magnetic solid acid catalyst, but these two preparation methods are to directly coat the active component on the surface of the magnetic core, the disadvantage is that the surface active component is affected by the influence of the magnetic core and d...

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