Preparation method of catalytic wet oxidation catalyst composited by precious metal, transition metal and rare earth

Abstract

The invention discloses a preparation method of a catalytic wet oxidation catalyst composited by precious metal, transition metal and rare earth. The preparation method comprises the following steps: (1) preparing a gamma-Al2O3 carrier for later use; (2) preparing 20.0 weight parts of impregnation liquid containing Pd<3+>, Fe<3+>, Co<3+> and Ce<3+>; (3) impregnating the gamma-Al2O3 carrier prepared in the step (1) into the impregnation liquid prepared in the step (2), and performing dynamic impregnation; (4) taking out the gamma-Al2O3 carrier which is dynamically impregnated, drying the gamma-Al2O3 carrier, and putting the dried gamma-Al2O3 carrier into a muffle furnace for roasting to obtain the catalytic wet oxidation catalyst. According to the prepared catalytic wet oxidation catalyst, the oxidative decomposition capability can be improved, the reaction speed is increased, and the removal rate and the biodegradability of organic matters in waste water are greatly improved.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a method for preparing a "noble metal-transition metal-rare earth" composite catalytic wet oxidation catalyst. Background technique [0002] Ceramic printing wastewater includes wastewater from decal paper production process, printing table washing water, ground washing water and mixed sewage. Its COD Cr (Dichromate index) is 500~20,000mg / L, BOD 5 About 100-3,000mg / L, chromaticity 500-10,000 times, pH value about 7.0; biodegradability index B / C of wastewater is about 0.15, which is less than the critical value of biodegradability index of wastewater 0.3. Ceramic printing wastewater belongs to high-concentration biochemically difficult organic wastewater. [0003] Catalytic wet air oxidation (Catalytic Wet Air Oxidation, referred to as CWAO) technology is under the action of a catalyst, under the conditions of a reaction temperature of 150-315°C, a reaction pressure of 2-15MPa, and a re...

AI Technical Summary

Problems solved by technology

[0004] For the active components of supported catalysts, there are three types: noble metals, rare earth metals and transition metals. Noble metals have high activity and stable performance but are expensive; rare earth metals have low relative strength but can improve catalyst activity and stability; transition metals have high activity but are expensive. Poor stability; at present, domestic researchers use one or two of noble metals, rare earth metals and transition metals as active components; in our research, we combine noble metals, rare earth metals and transition metals, expecting to achieve high activity, strong stability, Composite catalyst with low cost