Porous solid test piece for storing ammonia and preparation method thereof

Abstract

The invention relates to a porous solid test piece for storing ammonia. The preparation method of the porous solid test piece comprises the following steps: mixing industrial anhydrous strontium chloride powder, clay, expanded graphite and industrial alcohol to form a mixture, and evenly stirring with a stirrer to form semidry mixture powder; adding the semidry mixture powder into an openable closed container, and carrying out mechanical oscillation to form a wet test piece; and drying at 60-80 DEG C under the vacuum degree of 1-10<-1>Kpa. The invention effectively improves the viscosity and mechanical strength of the mixture on the premise of ensuring the ammonia storage characteristic of the metal salt; by adding the expanded graphite, the strontium chloride metal salt powder has more NH3 molecular channels, thereby generating large specific area and enhancing the adsorption capacity of the mixture porous solid test piece; and the stable skeleton structure of the expanded graphite provides powerful guarantee for possible structure collapse of the mixture in the repeated adsorption / desorption process.

Description

technical field [0001] The invention relates to a porous solid sample block for storing ammonia and a preparation method thereof, which is applied to a post-treatment system of automobile exhaust and a hydrogen fuel cell system of a new energy automobile. Background technique [0002] Today, the world is facing the dual challenges of energy crisis and environmental crisis. People are still facing many problems in the selection of technical means to meet the emission standards of traditional vehicles, and in the fuel supply technology of new energy vehicles. [0003] In terms of traditional automobiles, the SCR aftertreatment system relies on the precise supply of urea reducing agent and decomposes it into ammonia at the front end of the catalyst to remove NOX hazards, thereby achieving the purpose of purifying exhaust gas. However, in actual use, there are many deficiencies and difficulties in the metered injection of liquid urea that relies on urea decomposed into ammonia ...

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Problems solved by technology

This patent uses solid material for direct compression molding, uses binder, only declares that it may be silica fiber binder, and does not add the proportion, and other claims and examples only state that the solid material may include Composition of granular materials, porous materials, crystalline materials, amorphous materials or their combinations, without clear claim details, it is almost impossible for those skilled in the industry to implement

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