Catalyst for preparing H2 by direct cracking of methanol, and preparation method and application of catalyst

Abstract

The invention discloses a catalyst for preparing H2 through direct cracking of methanol and application of the catalyst. According to the composition of the catalyst, a precursor for preparing the copper-cobalt bimetallic catalyst is a mixed solution of copper nitrate and cobalt nitrate; ae cocatalyst precursor is a mixed solution of lanthanide nitrate and potassium nitrate; a carrier is a mixtureof pretreated multilayer carbon nanotubes and magnesium oxide. The catalyst comprises 20-30% (w / w) of copper serving as an active component, 10-20% (w / w) of cobalt serving as another active component, 1-10% (w / w) of lanthanum serving as a co-catalytic component and 1-5% (w / w)of potassium serving as an accelerant, with the balance being the mixed carrier composed of the carbon nanotubes and magnesium oxide; and the catalyst is prepared through an alcohol heating-roasting method. According to the invention, methanol is directly cracked to prepare hydrogen, the conversion rate of methanol exceeds 95%, and the selectivity of H2 and CO exceeds 95%.

Description

technical field [0001] The invention belongs to methanol as raw material to prepare hydrogen (H 2 ) technical field, specifically, is a kind of direct cracking of methanol to prepare H 2 catalysts and their applications. Background technique [0002] The existing methanol hydrogen production technology is relatively common and mature, mainly using methanol and water vapor as raw materials, at 250-280°C and under certain pressure conditions, and under the action of a copper-containing catalyst, the reaction of methanol cracking conversion is carried out to obtain hydrogen containing 70% hydrogen 2 with 30% CO 2 The reformed gas, and through the conventional pressure swing adsorption (PSA) technology to obtain the final H 2 Products have been widely used at home and abroad. However, the hydrogen production process of methanol water vapor conversion requires a certain external heat source to provide heat for its reaction, and a large amount of greenhouse gas CO is produced ...

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Problems solved by technology

[0006] Third, the hydrogen-containing methane cracking synthesis gas produced by methanol anaerobic catalytic direct cracking reaction also involves H 2 Purified H with relatively small adsorption separation coefficients with CO 2 It will also directly affect the economic cost and competitiveness of hydrogen production

These methods will generate more side reactions, and the by-product CO will be further transformed into CO 2

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