US 12,145,140 B2
Honeycomb catalyst for catalytic oxidative degradation of VOCs prepared by ultrasonic double-atomization process
Xiazhang Li, Changzhou (CN); Chao Yao, Changzhou (CN); Shixiang Zuo, Changzhou (CN); Xuhua Ye, Changzhou (CN); Fengqin Wu, Changzhou (CN); Haoguan Gui, Changzhou (CN); Guanghui Lu, Changzhou (CN); Liang Wang, Changzhou (CN); and Zeyue Xu, Changzhou (CN)
Assigned to CHANGZHOU UNIVERSITY, Changzhou (CN)
Filed by CHANGZHOU UNIVERSITY, Jiangsu (CN)
Filed on Mar. 22, 2024, as Appl. No. 18/614,616.
Application 18/614,616 is a continuation in part of application No. PCT/CN2023/111406, filed on Aug. 7, 2023.
Claims priority of application No. 202211174148.8 (CN), filed on Sep. 26, 2022.
Prior Publication US 2024/0226865 A1, Jul. 11, 2024
Int. Cl. B01J 35/57 (2024.01); B01J 23/06 (2006.01); B01J 23/10 (2006.01); B01J 23/34 (2006.01); B01J 23/75 (2006.01); B01J 23/755 (2006.01); B01J 27/224 (2006.01); B01J 37/02 (2006.01); B01J 37/08 (2006.01)
CPC B01J 35/57 (2024.01) [B01J 37/0207 (2013.01); B01J 37/0209 (2013.01); B01J 37/08 (2013.01); B01J 2235/10 (2024.01); B01J 2235/15 (2024.01); B01J 2235/30 (2024.01)] 4 Claims
OG exemplary drawing
 
1. A method for preparing a honeycomb catalyst, wherein
the honeycomb catalyst is used for catalytic oxidative degradation of Volatile Organic Compounds (VOCs), and
the honeycomb catalyst is prepared by an ultrasonic double-atomization process, comprising
step (1) placing honeycomb in nitric acid solution with mass concentration of 5%-15% for acidification for 6-18 h, cleaning and naturally drying the honeycomb after removal from the nitric acid solution, placing the honeycomb in a hydrothermal reactor, adding alcoholic solution for hydrothermal activation, wherein temperature of the hydrothermal activation is 120-180° C., and time of the hydrothermal activation is 6-18 h, naturally drying the honeycomb after performing the hydrothermal activation and removal from the hydrothermal reactor; wherein the honeycomb is attapulgite honeycomb, cordierite honeycomb, mullite, or silicon carbide honeycomb; wherein the alcoholic solution is ethanol solution with mass concentration of 25%-75%;
step (2) dissolving a soluble transition metal inorganic salt in deionized water and stirring thoroughly to obtain a precursor solution; preparing a precipitant solution; performing ultrasonic atomization of the precursor solution and the precipitant solution in an ultrasonic atomization device into droplets, and placing the honeycomb in a quartz glass reactor, wherein the droplets enter into the quartz glass reactor through a pipeline to come into contact with a surface of a honeycomb hole and rapidly react to generate a hydroxide precursor on the surface of the honeycomb hole; wherein the soluble transition metal inorganic salt is cobalt salt, manganese salt, cerium salt, nickel salt, or zinc salt; and
step (3) drying the honeycomb in a drying box after performing the ultrasonic atomization, and calcining the honeycomb in a muffle furnace to obtain a honeycomb catalyst loaded with the transition metal oxide.