公开(公告)号：US20230390753A1

公开(公告)日：2023-12-07

申请号：US18316455

申请日：2023-05-12

申请人： Beijing University of Chemical Technology

发明人： YUFEI HE ,  XINGYE LIN ,  DIANQING LI ,  SHUAI CHEN ,  YANAN LIU ,  JUNTING FENG

IPC分类号： B01J35/08 ,  B01J37/02 ,  B01J21/04 ,  B01J37/08 ,  B01J23/44 ,  B01J23/42

CPC分类号： B01J35/08 ,  B01J37/0211 ,  B01J23/42 ,  B01J37/08 ,  B01J23/44 ,  B01J21/04

摘要： The present invention discloses a hollow spherical catalyst for a fixed bed with internal fluidization of particles and a method for preparing the same. The preparation method used in the present invention is characterized in: fully mixing precious metal nanopowder with an organic oil phase to form an internal oil phase; preparing a gel ball of an oil-in-water structure by taking an aluminum oxide molding solution as an outer aqueous phase using an independently researched and developed coaxial dual-dropper forming apparatus; and then preparing a hollow aluminum oxide catalyst containing precious metal powder from the gel ball through processes of aging, calcination, and reduction. The resulting catalyst is expressed as X@Al2O3, where the precious metal nanopowder X is wrapped inside hollow Al2O3, and the catalyst has an outer diameter of 1.5-5.0 mm, a shell pore diameter (aluminum oxide) of 10-50 nm, and the precious metal nanopowder sized 200-500 nm. When the catalyst is used in a fixed bed, the reactant and product molecules diffuse into and out of the catalyst smoothly and fully contact with precious metal components, forming a micro-fluidization reaction system, thus realizing complementary advantages of an existing fixed-bed catalyst and a fluidized-bed catalyst, and reducing losses of active components of the precious metal.