Ag<+>-loaded hierarchical porous molecular sieve for removing sulfur-containing volatile organic compounds, preparation method and application thereof

Abstract

The invention relates to an Ag<+>-loaded hierarchical porous molecular sieve for removing sulfur-containing volatile organic compounds. The Ag<+>-loaded hierarchical porous molecular sieve is an Ag<+>-loaded hierarchical porous molecular sieve, which has both a mesoporous structure and a microporous structure. According to the invention, Ag<+> and sulfur-containing VOCs can form Ag-S bonds, so that original physical adsorption is converted into chemical adsorption, adsorption sites of sulfur-containing VOCs are prevented from being occupied by other adsorbents, and the adsorption capacity of the molecular sieve on sulfur-containing VOCs is greatly enhanced; the molecular sieve uses a high-silicon USY (Ultra-Stable Y) molecular sieve as a framework, and a mesoporous structure is formed in the microporous molecular sieve through alkali treatment modification; by adopting the hierarchical porous molecular sieve with both the mesoporous structure and the microporous structure, the mass transfer in the molecular sieve can be enhanced; and Ag<+> is loaded through ion exchange, so that the adsorption of the molecular sieve on sulfur-containing VOCs is enhanced.

Description

technical field [0001] The invention relates to the field of environmental pollutant treatment, in particular to an Ag for removing sulfur-containing volatile organic compounds (VOCs) + Loaded multi-stage pore molecular sieve, preparation method and application thereof. Background technique [0002] VOCs are widely found in the pharmaceutical, chemical and other industries. Sulfur-containing VOCs, such as sulfides and mercaptans, are usually produced during the biochemical treatment of sewage stations in the above industries, which are important sources of PM2.5 and near-surface ozone. At the same time, the odor threshold of sulfur-containing VOCs is extremely low, such as the odor threshold of methyl sulfide is 0.003ppm, which causes the environment of production and living areas to deteriorate. [0003] VOCs control technologies mainly include recovery technologies represented by adsorption, absorption, membrane separation, and condensation technologies, as well as destru...

AI Technical Summary

Problems solved by technology

[0005] Since sulfur-containing VOCs are usually only C 2 or C 3 Molecules, smaller molecular sizes are not easy to be captured by adsorbents. Whether activated carbon or molecular sieves are used for the adsorption of sulfur-containing VOCs, there are problems such as low adsorption capacity and adsorption sites are easily occupied by other VOCs.

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