Preparation method and application of noble metal-transition metal-rare earth compound catalyst for catalytic wet oxidation

Abstract

The invention discloses a preparation method of a noble metal-transition metal-rare earth compound catalyst for catalytic wet oxidation. The preparation method comprises the following steps: (1) preparing a gamm-Al2O3 carrier for later use; (2) preparing 20.0 parts by weight of impregnation liquid containing Pd<2+>, Fe<3+>, Co<2+> and Ce<3+>; (3) impregnating the gamm-Al2O3 carrier prepared by the step (1) into the impregnation liquid prepared by the step (2), and dynamically impregnating; and (4) taking out the dynamically-impregnated gamm-Al2O3 carrier and drying; and finally, putting the gamm-Al2O3 carrier into a muffle furnace to be roasted to prepare a Pd-Fe-Co-Ce / gamma-Al2O3 catalyst. The catalyst prepared by the preparation method is stable in performance; when the catalyst is applied to catalytic wet oxidation treatment of ceramic printing wastewater, the oxidative decomposition capability of pollutants can be improved and the reaction speed is improved; and the removing rate and the biodegradability of organic matters in the wastewater are greatly improved.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a preparation method of a "noble metal-transition metal-rare earth" composite catalyst and its application in ceramic printing wastewater treatment. 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) 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 temperatur...

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

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