Patent ID: 9045349
Filing Date: 2015-06-02
Classification: B01J,B82Y,C01F,C01P

Abstract:
1. A method for preparing a porous alumina, comprising: simultaneously injecting a sodium aluminate solution and a nitric acid or polyaluminumchloride solution into a continuous-flow mixer using a metering pump while maintaining a constant temperature in a temperature range from to 95° C., and forming a hydrogel while the pH of the mixed solution in the mixer is neutralized from 9 to 10 by bringing the sodium aluminate solution in contact with the nitric acid or polyaluminumchloride solution in the mixer; converting the hydrogel formed in the mixer into a colloidal sol by allowing the hydrogel to reside in the mixer for 5 seconds to 20 seconds while subjecting the hydrogel to torque; and preparing a porous alumina having a boehmite or pseudoboehmite structure by introducing the colloidal sol into a hydrothermal synthesis reactor and crystallizing the colloidal sol at a temperature from 90° C. to 150° C.