A desulfurizer, its preparation method and application

Abstract

This invention provides a desulfurizing agent, its preparation method, and its application. The preparation method of the desulfurizing agent includes: mixing a first structure-directing agent, a second structure-directing agent, a first silicon source, and a first aluminum source in water, then adding ZSM-5 molecular sieve seed crystals for uniform dispersion, hydrothermal crystallization, and calcination to obtain ZSM-5 molecular sieve nanocrystals; mixing a solution of ZSM-5 molecular sieve nanocrystals, a binder, a pore-expanding agent, and an active metal salt, extruding and molding, and calcining to obtain the desulfurizing agent; wherein the first structure-directing agent is selected from quaternary ammonium bases and / or quaternary ammonium salts, and the second structure-directing agent is selected from quaternary ammonium bases; the cation charge density of the first structure-directing agent is higher than that of the second structure-directing agent. The preparation method of the desulfurizing agent provided by this invention uses a dual-structure-directing agent and seed crystals to synergistically induce and regulate the crystallization process, thereby effectively controlling the mesoscopic structure of the desulfurizing agent and significantly improving its desulfurization activity.

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