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3.
3.
1 Research progress of catalysts
The catalysts used in CWAO are divided into two categories: homogeneous catalysts and heterogeneous catalysts
.
Homogeneous catalysts have a big disadvantage, that is, the catalyst is miscible with the aqueous solution, needs to be separated after the reaction, and the separation cost is relatively high, so in recent years, research has been less
Noble metal series (such as Pd, Pt, Ru, Rh, Ir, Au, Ag as active ingredients) have high activity, long life and strong adaptability, but they are expensive and limited in application
.
During the CWAO reaction process, the precious metal components are relatively stable, so the stability of the precious metal catalyst will mainly depend on the stability of the support, and Al 2 O 3 is the most commonly used support
Non-precious metal catalysts include catalysts with one or more of the metal elements such as Cu, Fe, Mn, Co, Ni, Bi as the main components, and rare earth series oxide catalysts represented by Ce
.
Non-precious metal catalysts (Cu and Fe series catalysts have higher activity).
In recent years, reports on carbon material catalysts have also appeared one after another
.
For example, using multi-walled carbon nanotubes (MWNTs) as catalysts, the activity and stability of catalytic wet oxidation of phenol and aniline have been studied in batch reactors
From the perspective of the development of catalysts at home and abroad, Japan has taken the lead in research and application.
Among them, Osaka Gas Company has done a lot of research on catalytic wet oxidation treatment technology, and has been quite mature in the preparation and application of catalysts
.
The catalytic wet oxidation method has been applied on an industrial scale in Japan and other countries, and a large number of catalyst patents appear every year.