Methanol steam reforming hydrogen production copper-based catalyst activation method

Abstract

The invention relates to a methanol steam reforming hydrogen production copper-based catalyst activation method. The method includes steps: heating a catalyst bed layer from the normal temperature toan activation temperature, keeping the temperature constant, subjecting activator methanol aqueous solution to preheating vaporization in a preheater, feeding into the catalyst bed layer, carrying outcatalyst activation reaction, cooling outlet tail gas of a reactor bed layer in an activation process through a condenser, performing gas-liquid separation, analyzing separated gas phase composition,and stopping feeding of the methanol aqueous solution after activation is finished when the gas phase composition is stable. The activation process is simple and easy to control, high in reduction efficiency, low in activation cost and can be widely applied to activation of methanol steam reforming hydrogen production copper-based catalysts in methanol fuel cell systems.

Description

technical field [0001] The invention relates to the technical field of fuel cell mobile hydrogen production, in particular to an activation method for a copper-based catalyst used for hydrogen production by steam reforming of methanol in a methanol fuel cell system. Background technique [0002] As a new type of power generation, hydrogen fuel cells have the characteristics of high efficiency and zero pollution emissions. They will play an increasingly important role in the energy field and are an important way to achieve low-carbon and clean energy. There are two main sources of hydrogen fuel for vehicle fuel cells, one is direct use of hydrogen, and the other is vehicle-mounted mobile hydrogen production technology. At present, the vehicle-mounted mobile hydrogen production technology mainly uses alcohols, ethers, gasoline and other substances as raw materials, and uses catalytic reforming technology to produce hydrogen. Among them, methanol in alcohol raw materials has hi...

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Problems solved by technology

In terms of using alcohol or alcohol-containing liquid as a reducing agent to activate copper-based catalysts, patent CN1335201 discloses a reduction method for copper-containing catalysts, using C1~C12 primary or secondary alcohols as reducing agents to dehydrogenate or add The hydrogen catalyst is activated by raising the temperature in the reactor. Since only alcohol is used as the reducing agent in the reduction process, the decomposition of alcohol will be involved in the whole process of catalyst reduction, and the decomposition process of alcohol on the surface of the catalyst produces very complex gas groups. It has an important influence on the reduction process of the catalyst, which is not conducive to the control of the reduction process

Patent CN1850332A discloses a reduction method of copper-based catalyst for hydrogen production by steam reforming of methanol. The dehydration stage of the catalyst is purged with air, and then the gas phase mixture of hydrogen and water is used to initiate the reduction of the catalyst. Finally, 0.1~5% The conversion rate of the catalyst after activation is over 99%, but there are some shortcomings. Quantitative gas purging is used in the reduction process, and a special gas distribution channel needs to be equipped, and hydrogen gas is still used in the reduction process. Equipped with special equipment for hydrogen storage and delivery, which makes the whole process complicated

Patent CN102416327B discloses a reduction method of copper-zinc catalyst for hydrogen production by steam reforming of methanol. The catalyst reduction process includes three stages of dehydration, reduction and reduction enhancement. Water hydrogen reduction is still required in the process, and the operation process is cumbersome.

Patent CN106552678 discloses a rapid reduction method for copper-containing catalysts. In the early stage, methanol aqueous solution is used to reduce the raw material after preheating to drive the catalyst bed inlet to rapidly rise to 190°C. The catalyst activation temperature is 200~205°C. The volume fraction of methanol in the methanol aqueous solution is 1.5~2.5%, the catalyst is reduced to the end. The content of water in the reducing solution of this reduction method is too high, resulting in the reduction of the copper grains generated by the reduction in a high water vapor atmosphere. , ultimately affecting the stability of the catalyst

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