A kind of pt-ru bimetallic nano-catalyst and preparation method thereof for catalytic wet oxidation of high-concentration organic wastewater

Abstract

The invention discloses a Pt-Ru bimetallic nano-catalyst used for catalytic wet oxidation of high-concentration organic wastewater and a preparation method thereof, belonging to the fields of water treatment technology and environmental protection functional materials. The Pt-Ru bimetallic nanocatalyst for catalytic wet oxidation of high-concentration organic wastewater uses Pt-Ru nano-alloys as active components, and TiO modified with nitrogen and sulfur 2 -CeO 2 The composite oxide is the carrier, the content of the active component is 0.1wt%-3.0wt%, and the rest is the carrier. The catalyst has high catalytic activity and stability, the active components of the catalyst are not easily lost, and can effectively treat high-concentration organic wastewater.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst for catalytic wet oxidation of high-concentration organic wastewater and a preparation method thereof. Background technique [0002] Catalytic wet air oxidation (Catalytic Wet Air Oxidation, CWAO) is an advanced method for treating high concentration, high toxicity, refractory wastewater and high COD developed on the basis of wet oxidation technology (WAO) internationally in the mid-1980s. Environmental protection technology, the main principle of this technology is to oxidize and degrade organic matter in wastewater by using oxygen in the air in the presence of a catalyst at a certain temperature (170-300°C) and pressure (2.0-10MPa) to make it Transformed into small molecular organics or completely mineralized into CO 2 、H 2 O, N 2 , SO 2 and other harmless components to achieve the purpose of wastewater purification. [0003] The core of catalytic wet oxidation treatment of organic...

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Problems solved by technology

CN103877973B discloses a catalytic wet oxidation catalyst, with modified ZrO 2 As a carrier, one or more of noble metals Ru, Pt, Pd, Rh and Ir are used as active components, and the catalyst is based on ZrO 2 As the main carrier, the stability of the catalyst remains good after 240 hours of operation in high temperature, high pressure, and acidic environments, but the catalyst activity is not high, mainly due to the 2 Oxygen storage capacity is weak, with CeO 2 、TiO 2 , SiO 2 to ZrO 2 Doping modification mainly increases the specific surface area of ​​the carrier, but has not fundamentally improved the oxygen storage capacity of the carrier, nor improved the electronic structure of the carrier.

The noble metal and non-noble metal in the catalyst form a nano-alloy (Applied catalysis B: Environmental, 2016, 184: 216-222), and its activity is better than that of any catalyst with a single active component, but the non-noble metal part of the active component is in the wet catalyst. There is still the possibility of loss in long-term operation under oxidative conditions

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