Preparation method of iron-based composite catalyst for catalytic ozonation treatment of coal chemical wastewater

Abstract

The invention discloses a preparation method of an iron-based composite catalyst for catalytic ozonation treatment of coal chemical wastewater. The preparation method comprises the following steps: activating / pretreating a carrier, preparing a metal precursor solution, loading Fe onto an Al2O3 carrier, and performing oscillating, aging, drying and washing. According to the preparation method, the aluminum oxide is taken as the carrier, urea is taken as a self-sacrifice template, so that iron oxide is loaded on the surface of aluminum oxide, and the existence of urea is beneficial to precipitation of iron on the carrier; when heating is carried out at 90-120 DEG C, urea can be decomposed very slowly to form hydroxyl groups, and the hydroxyl groups are uniformly distributed on the surface and pores of the Al2O3 carrier; then, ferric hydroxide and ferric oxyhydroxide are precipitated on the surface of the carrier. The active substance directly grows on the surface of the carrier, so that the stability and dispersity of Fe are obviously improved, and meanwhile, the loading amount of Fe on the carrier is increased.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a method for preparing an iron-based composite catalyst used for catalytic ozonation treatment of coal chemical wastewater. Background technique [0002] Despite the recent reform measures and regulations formulated by the Chinese government in terms of energy consumption and environmental protection, which have promoted the deployment of non-fossil energy (e.g., solar, wind, nuclear energy) and the development of electric vehicles nationwide, coal is still China's The main energy source, for example, in 2018, coal accounted for about 60% of domestic energy consumption, equivalent to one-half of the world's annual coal consumption. Therefore, the huge demand for coal energy makes the coal chemical industry an important contributor to wastewater discharge, and the coal chemical wastewater discharged by it contains high concentrations of toxic and harmful compounds, such as poly...

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Problems solved by technology

[0005] Catalyst loading methods commonly used in industrial production are mainly divided into two categories: surface precipitation method and granulation method, however, traditional catalyst loading methods are often inefficient, and the amount and dispersion of loaded active substances are very low

In addition, in some cases, the traditional loading method will cause the active species to form clusters on the surface of the catalyst support, which reduces the utilization of active species and active sites.

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