MAGNETIC SUPERFINE SOLID ACID CATALYST WITH DOUBLE SHELL STRUCTURE AND PROCESS FOR PREPARING

WIPO Patent Application WO/2003/090927

A1

The present invention relates to the magnetic superfine solid acid catalyst with double shell structure and the process for preparing it. The properties of structure for catalyst is that the magnetic nucleus surface is covered by carrier with high specific surface area and hence forms carrier with magnetic nucleus on which there is a layer of strong acid solid acid. This catalyst is prepared by coating the surface of magnetic nucleus Fe₃O_4, Co−Fe₃O₄, Mn−Fe₃O₄ or Ni−Fe₃O₄ with carrier having high specific surface area, such as SiO₂, ZrO₂, Al₂O₃, TiO₂, etc. by using sol−gel method, followed by dispersing strong acid solid acid Zr(SO₄)₂, SO₄²⁻ −ZrO₂, etc. into the surface of carrier with magnetism by using impregnation method. Such solid acid catalyst with double shell structure is mainly used to acid catalystic reaction, which has the advantage of having magnetism and high activity.

DUAN XUE
CHANG ZHENG

PCT/CN2002/000756

November 06, 2003

October 25, 2002

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UNIV BEIJING CHEMICAL (CN)

B01J27/053; B01J35/00; B01J35/08; B01J37/02; (IPC1-7): B01J27/053; B01J37/02

JPH06107474A	1994-04-19
CN1290574A	2001-04-11

CHANG ZHENG ET AL.: "Preparation and character study of the magnetic nano-size solid acid catalyst Zr(SO4)2/Fe3O4", CHINESE JOURNAL OF INORGANIC CHEMISTRY, vol. 17, no. 13, May 2001 (2001-05-01), pages 1 - 6

NTD PATENT & TRADEMARK AGENCY LTD., BEIJING OFFICE (Block A Investment Plaz, 27 Jinrongdajie Beijing 2, CN)

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