| abstract |
The present invention provides a method for preparing a heterogeneous solid catalyst for producing ammonia by hydrolysis of urea, which comprises steps S1: preparation of alumina precursor; preparation of S2 catalyst carrier; and preparation of S3 catalyst. The present invention adopts Al 2 O 3 as carrier and basic metal oxide as active component, and prepares heterogeneous solid catalyst by impregnation method. After alumina supports basic oxide active component, the catalyst can expose more The catalytically active site is conducive to the occurrence of urea-catalyzed hydrolysis reaction. The heterogeneous solid catalyst prepared by the invention has stable physical and chemical properties, good hydrothermal stability, is not easy to lose active components after long-term use, can be reused, and has low preparation cost; at the same time, the catalyst can reduce operating temperature and pressure, and reduce steam consumption , reduce the operating cost of the system. |