Multi-phase catalytic ozone oxidation catalyst and preparation method thereof

Abstract

The invention discloses a method for preparing a multi-phase catalytic ozone oxidation catalyst. The multi-phase catalytic ozone oxidation catalyst is formed by mixing the following components according to weight percentage: 61 to 64% of coal ash, 6 to 9% of metal oxide, 5 to 6% of cement, 5 to 6% of gypsum, 15 to 20% of lime, and aluminium powder which accounts for 0.06 to 0.07% of the total weight of the raw materials, wherein the coal ash is taken as aggregate, the metal oxide is taken as an active agent; the cement, the gypsum and the lime are taken as gelling agent; and the aluminium powder is taken as a foaming agent. The method comprises the following steps: mixing the raw materials into size and foaming the size to form a block; feeding the block to a still kettle; and consolidating the block at the temperature of 160 to 200 DEG C and the saturation pressure of more than 0.6MPa. The catalyst does not need high-temperature roasting, is short in process period, low in production cost, free of hidden danger, energy-saving, wide in source of raw materials and low in material cost, does not generate harmful gas and cause pollution to the environment, and can utilize the coal ash waste; and furthermore, the catalyst contains various active components and is wide in practicability, strong in applicability, available in a lot of waste water, long in service life, recyclable and free of secondary pollution.

Description

technical field [0001] The invention relates to a catalyst, in particular to a heterogeneous catalytic ozone oxidation catalyst and a preparation method. Background technique [0002] The traditional catalytic ozone oxidation method is to configure the catalyst into a solution of a certain concentration and add it to the wastewater. The catalyst exists in the wastewater in the form of ions, and then the ozone is passed into the homogeneous catalytic oxidation. Although the treatment effect can be improved, the presence of this catalyst It is difficult to recycle, the cost of the agent is high, and the introduced catalyst will cause secondary pollution, the utilization rate of ozone is also low, and the treatment effect is not good. Therefore, the application in wastewater treatment is largely limited. Therefore, how to use catalytic ozonation to carry out heterogeneous catalysis, improve the utilization rate of ozone, enhance the ability of ozone oxidation, and reduce the t...

AI Technical Summary

Problems solved by technology

But so far, there are still some problems in its research results: first, there is a lack of actual productive experimental data, and its research is mainly based on bench tests with distilled water; second, the principle of heterogeneous catalytic ozonation is still in the speculation stage, and it is not yet possible The reaction mechanism is completely clear; the third is that there are many types of pollution and the chemical composition varies widely, and there are different choices for catalysts. At present, there is no general-purpose catalyst

The problem with this method is that the production cycle is long, the whole process needs more than 20 hours, and the production efficiency is low; the second is that the copper nitrate solution is a strong oxidant, which is converted into copper oxide and oxidized on the surface of the pores of the honeycomb ceramsite. Copper not only has a high conversion cost, but also causes combustion and explosion when co-heated with carbon powder, sulfur and other combustibles during the roasting process, which not only poses a serious safety hazard, but also produces toxic nitrogen peroxide with a pungent smell during the roasting process Gas, pollutes the environment, and consumes a lot of energy

This preparation method also has the problem of producing harmful gas and polluting the environment during the conversion of iron salt into iron oxide, and it consumes a lot of energy.

To sum up the above, the current preparation methods of supported catalysts for heterogeneous catalytic ozone oxidation are firstly to go through processes such as impregnation, drying and roasting, the preparation cycle is long, and the production efficiency is low; The consumption is high, and it will produce safety hazards and harmful gases during the transformation, polluting the environment