Hydrogen production from liquid methanol advances using Tsinghua University platinum catalysts
A research team at Tsinghua University published a study on July 7, 2026, in Energy & Environment Nexus showing that aqueous-phase reforming of liquid methanol can generate hydrogen directly at 150 to 250 °C without the high-temperature vaporization required by conventional gas-phase methods. Led by Hui Zhou, the researchers evaluated platinum catalysts supported on five distinct oxides to identify how surface oxygen species control reaction pathways and efficiency.
Catalyst performance across different oxide supports
Testing five different oxide supports revealed sharp activity differences during aqueous-phase methanol reforming. Hydroxyl-containing amphoteric oxides delivered the highest reaction rates, reducible oxides showed intermediate performance, and inert silicon dioxide performed the worst. At 250 °C, the platinum catalyst supported on aluminum oxide produced hydrogen at a rate of 846.9 micromoles per gram of platinum per second. By comparison, platinum on cerium oxide produced 329.8 micromoles per gram per second, while platinum on silicon dioxide yielded just 41.4 micromoles per gram per second, according to the published findings.
The research team prepared all catalysts using wet impregnation and tested them in an autoclave containing a 1-to-3 molar ratio of methanol and water. Structural and surface analyses—including X-ray photoelectron spectroscopy, electron paramagnetic resonance, and in-situ diffuse reflectance infrared Fourier transform spectroscopy—demonstrated that surface hydroxyl density and metal-support interactions dictate whether intermediate molecules convert smoothly or become trapped on the catalyst.
Surface chemistry mechanisms in aqueous-phase reforming
On aluminum oxide supports, which contained a surface hydroxyl proportion of 48.7%, methanol decomposed efficiently at platinum sites while surface hydroxyls supplied accessible hydroxyl species to convert adsorbed carbon monoxide through the water-gas shift reaction. These consumed hydroxyls were continuously replenished through water dissociation. Conversely, reducible supports like cerium oxide formed reactive lattice oxygen that supported formate generation, but the resulting formate bonded too strongly and remained on the surface after nitrogen purging, which obstructed subsequent hydrogen production steps.
Frequently asked questions about aqueous-phase methanol reforming
Why is liquid methanol explored as a hydrogen carrier?
Hydrogen has a low volumetric energy density that makes storage and transportation difficult. Methanol offers an attractive alternative because it remains liquid under ambient conditions, contains 12.5 weight percent hydrogen, and utilizes existing fuel distribution infrastructure.
How does aqueous-phase reforming differ from conventional methods?
Conventional gas-phase methanol steam reforming typically operates at temperatures above 300 °C and requires extra equipment to vaporize both methanol and water. Aqueous-phase reforming generates hydrogen directly from a liquid mixture between 150 and 250 °C, limiting unwanted byproducts like carbon monoxide and methane.
What role do surface oxygen species play in the reaction?
The Tsinghua University study established that surface oxygen species act as key descriptors for catalyst performance. Effective hydrogen generation requires a balanced surface that activates methanol and water without trapping reaction intermediates, showing that neither maximum oxygen reactivity nor high oxygen-vacancy abundance alone yields the most active catalyst.
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