SCR catalyst using all-hazardous wastes and solid wastes as carrier, and preparation method and application thereof

Abstract

The invention relates to an SCR catalyst using all-hazardous wastes and solid wastes as a carrier, and a preparation method and application thereof. The method comprises the following steps: mixing, by weight, 7-10 parts of a waste denitration catalyst, 1-2 parts of coal gangue, 0-1 part of aluminum ash and 1-3 parts of sludge for pretreatment to obtain mixture powder ; adding sludge, deionized water and a forming aid into the mixture powder, uniformly mixing, adding ammonia water to adjust the pH value to 6.5-7.5, and mixing and refining mud to obtain a mud blank; preparing the mud blank into a raw material sphere with the diameter of 1-3 cm, drying, and calcining at 350-1100 DEG C to obtain a calcined spherical carrier; dipping the calcined spherical carrier in a precursor solution of an active component, performing in-situ drying, and repeating the process until the weight of the calcined spherical carrier is increased by 15-20%; and calcining the spherical carrier impregnated with the active component at 350-550 DEG C to obtain the catalyst. The preparation cost is low and large-scale production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of environmental protection catalysis, and in particular relates to an SCR catalyst using hazardous waste and solid waste as a carrier, a preparation method and application thereof. Background technique [0002] With the development and progress of society, the massive discharge of urban sewage and domestic wastewater has led to a sharp increase in the generation of sludge. The composition of sludge is complex, and it is difficult to dispose of and recycle resources. The current methods of sludge utilization mainly include the preparation of fertilizers and the preparation of activated carbon. , incineration to make bricks, land utilization, etc. However, there are still problems such as the scale of treatment cannot keep up, the treatment technology is not perfect, and improper treatment has a negative impact on the soil. It is necessary to continuously innovate the treatment methods. [0003] Selective Ca...

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Problems solved by technology

[0005] Liu Tao et al. Prepared denitrification catalyst with residual sludge from urban sewage treatment plants[J]; Chemical Environmental Protection; Issue 01, 2007. In the article, pyrolysis sludge was used as carrier to prepare denitrification catalyst, but the problem of the catalyst is the activation temperature If it is too high, the active components are Zn and Fe transition metal elements, and the stability is also poor, and the activity will drop within 10 hours; The highest conversion efficiency of the catalyst still cannot reach 90%. In actual engineering use, the conversion efficiency is low and there is a problem of ammonia escape, and the use of transition metals as the main active component has the problem of sulfur poisoning; Chinese Patent Publication No. CN110961106A discloses A high-performance low-temperature denitrification catalyst prepared by using waste solid resources and its preparation method, which uses sludge as a part of the preparation of the denitrification catalyst, but the conversion rate is only about 55%, and the activity decreases in a short operating time ; Chinese Patent Publication No. CN111744495A discloses a ceramic membrane denitrification and dedioxin catalyst using sludge and steel slag as raw materials and a preparation method thereof, but its preparation method is relatively cumbersome and not suitable for large-scale industrial production, and the applicable temperature Higher, 500°C

[0008] (2) In the currently reported articles and reviews using sludge as part of the raw material to prepare denitrification catalysts, there is no method suitable for large-scale application;

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