Hydrogen generation from methanol at near-room temperature

Area of Science:

• Chemical Engineering
• Catalysis
• Biotechnology

Background:

• Methanol is a promising hydrogen storage medium due to its high hydrogen content and low cost.
• Conventional methanol-water reforming requires high temperatures (>200 °C), limiting its practical application.
• Developing efficient, low-temperature hydrogen production methods is crucial for sustainable energy.

Purpose of the Study:

• To design an effective strategy for complete methanol conversion to hydrogen at near-room temperature.
• To develop novel catalysts for efficient hydrogen production from methanol.
• To demonstrate long-term hydrogen generation stability.

Main Methods:

• Simultaneous dehydrogenation of methanol to formic acid (HCOOH) and reduced nicotinamide adenine dinucleotide (NADH) using alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH).
• Conversion of HCOOH to H₂ using a novel iridium polymer complex catalyst.
• Enzymatic mimic conversion of NADH to H₂ and nicotinamide adenine dinucleotide (NAD⁺), with NAD⁺ regeneration for a cyclic process.

Main Results:

• Achieved full conversion of methanol to hydrogen for over 1900 minutes (∼32 hours) at near-room temperature.
• Successfully demonstrated a dual pathway strategy involving HCOOH and NADH intermediates.
• Developed a stable catalytic system for sustained hydrogen production.

Conclusions:

• The developed strategy enables efficient, low-temperature hydrogen production from methanol.
• The novel catalysts and approach show potential for hydrogen storage and applications.
• The methodology can be extended to other small organic molecules and biomass for hydrogen generation.