Catalyst for preparing H2 through conversion of methanol steam and application thereof

Abstract

The invention discloses a catalyst for preparing H2 through conversion of methanol steam and application of the catalyst. The catalyst comprises: a precursor for preparing a copper-cobalt bimetallic catalyst, namely a mixed solution of copper nitrate (Cu(NO3)2) and cobalt nitrate (Co(NO3)3); a cocatalyst precursor, namely a mixed solution of lanthanide nitrate (La(NO3)3) and potassium nitrate (KNO3); and a carrier, namely a mixture of pretreated multilayer carbon nanotubes (CNTs) and activated aluminum oxide (Al2O3). An alcohol thermal dissolving-roasting method is used to prepare the catalystcontaining 40-60% (w / w) of the active component copper, 10-20% (w / w) of the active component cobalt, 1-5% (w / w) of the cocatalyst component lanthanum and 1-5% (w / w) of the accelerator potassium, withthe balance being the mixed carrier consisting of the carbon nanotubes and the activated aluminum oxide. Under the conditions that a reaction temperature is 240-300 DEG C and a reaction pressure is 1.0-3.0 MPa when the catalyst is used in the methanol steam conversion, the space velocity of the catalyst per unit can reach 1,600-3,000 / g (catalyst).h or above, the conversion rate of methanol is 96-99% or above, and the consumption of raw material methanol is 0.38-0.40 kg for each standard cubic meter of a hydrogen product.

Description

technical field [0001] The invention belongs to the technical field of preparing hydrogen (H2) with methanol as a raw material, and specifically relates to a catalyst for preparing H2 by converting methanol into water vapor and its application. Background technique [0002] The existing methanol hydrogen production technology is relatively common and mature, mainly using methanol and water vapor as raw materials, under the action of a copper-containing catalyst, methanol cracking conversion reaction is carried out at 250-280°C and under a certain pressure condition, and then the hydrogen-containing hydrogen is obtained through a conversion reaction. The conversion gas of 70% H2 and 30% CO2, and the final H2 product obtained by conventional pressure swing adsorption (PSA) technology have been widely used at home and abroad, and corresponding copper-containing catalysts have also been developed. Catalysts are prone to carbon deposition and deactivation when the methanol water ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of low space-time ratio of the copper-containing catalyst in the existing methanol-steam reforming hydrogen production technology and the high CO content in the reformed gas, the medium-low temperature shift load is increased. The present invention can provide a catalyst for preparing H2 by steam conversion of methanol and its application, so that the catalyst has high activity and stability, and can produce hydrogen from methanol under the same working conditions as traditional copper-containing catalysts. The ability to increase by 1 to 2 times, and reduce the CO content in the reformed gas, so as to reduce the load of medium and low temperature shifts and save energy consumption. Therefore, the present invention provides the following method,

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