Aqueous-phase methanol reforming produces hydrogen by reacting methanol with liquid water over a catalyst. In the ideal overall reaction, one mole of methanol and one mole of water can yield three moles of hydrogen and one mole of carbon dioxide: CH₃OH + H₂O → CO₂ + 3H₂. In practice, the catalyst and operating conditions determine how much hydrogen forms and which side products appear.
How the reaction makes hydrogen
Aqueous-phase reforming of methanol (APRM) keeps the reaction in a liquid-water environment. The simplified reaction pathway described in review literature has two linked steps:
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- Methanol dehydrogenation: Methanol reacts to form hydrogen and carbon monoxide (CO).
- Water-gas shift: The CO reacts with water, producing additional hydrogen and carbon dioxide (CO₂): CO + H₂O → CO₂ + H₂.
Because these reactions can take place in the same reactor, the process need not be described as separate reforming and shift stages. The net equation summarizes the ideal chemistry, not a guarantee that a real reactor fully converts its feed or produces only hydrogen and CO₂. Review literature on methanol APR; review of APR process context
What happens in a real reactor
Actual product distribution depends on the catalyst and operating conditions, including temperature, pressure, feed ratio, and reactor design. Carbon monoxide is an intermediate, and competing chemistry can produce methane and water through methanation or Fischer–Tropsch-type pathways. These reactions can consume intermediates or reduce hydrogen selectivity, so catalyst design aims to favor dehydrogenation and the water-gas shift while limiting unwanted routes. Review literature on methanol APR; General APR review
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Temperature, pressure, and process context
A review describes platinum supported on alumina (Pt/alumina) as active for methanol APR at temperatures around 200°C. Broader aqueous-phase reforming literature gives an approximate operating context of 220–270°C and 30–60 bar, but these are not a universal methanol-specific recipe. Conditions vary across studies and should be read alongside each study’s catalyst, feed, and reactor details. Review literature on methanol APR; General APR review
The process is discussed as a lower-temperature route than gas-phase reforming, but a lower reaction temperature alone does not establish lower total energy use, cost, or emissions. Those comparisons depend on the methanol source, heat and pressure needs, catalyst lifetime, product separation, and the system boundary used.
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Catalysts: activity versus durability
Pt-based catalysts, including Pt/alumina, are commonly discussed for methanol APR. Nickel-based catalysts and other non-noble-metal approaches are also under investigation; broader APR research includes metals such as ruthenium. Metals and supports are not interchangeable: they can favor reforming, water-gas shift, or competing reactions differently. Catalyst assessment therefore considers hydrogen selectivity and stability as well as activity.
A 2026 review identifies relatively low reaction rates and structural vulnerability of catalysts in hot, pressurized water as obstacles for APRM. Those constraints matter because useful performance depends not only on producing hydrogen in a laboratory run, but also on maintaining catalyst function under hydrothermal operating conditions. Review literature on methanol APR; 2026 review of APR challenges
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How to interpret reported hydrogen yields
Published yields are tied to particular experimental conditions; they are not commercial guarantees or typical performance figures. A 2026 study of nickel on activated carbon reported a peak hydrogen yield of 41.9 mmol/L under its stated conditions: 240°C, a methanol-to-water molar ratio of 6:3, and one hour. The surfaced study material is internally inconsistent, however: its highlights also give 41.6 mmol/L. The figure should not be treated as a settled result without checking the full article, and neither value should be generalized beyond that experiment. 2026 Ni/activated-carbon study
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the chemistry does—and does not—establish
The stoichiometric equation shows the theoretical relationship between methanol, water, hydrogen, and carbon dioxide; it does not establish real conversion, selectivity, or process efficiency. APRM is a research-literature topic, not a validated commercial process specification in the cited evidence. Nor does the use of methanol as a hydrogen carrier by itself establish lifecycle emissions: that depends in part on how the methanol is produced and on the full energy and process boundary.
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For comparisons with methanol steam reforming, the useful questions are the reaction phase and water handling, temperature and pressure, catalyst composition and durability, hydrogen selectivity and side products, reactor and separation requirements, and the system boundary used for energy, cost, or emissions. The available evidence does not support a single universal ranking across those factors. Review of APR process context; General APR review
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