Method for reducing concentration of carbon monoxide in hydrogen-containing gas, method for producing ammonia using said method, solid adsorbent, system for reducing concentration of carbon monoxide using said solid adsorbent, and on-site ammonia production system

A solid adsorbent of Fe, Al, and K oxide efficiently reduces carbon monoxide in hydrogen-containing gases to sub-ppm levels, addressing catalyst poisoning and enhancing ammonia synthesis and fuel cell performance under low-temperature conditions.

WO2026121207A1PCT designated stage Publication Date: 2026-06-11AJINOMOTO CO INC
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
AJINOMOTO CO INC
Filing Date
2025-12-02
Publication Date
2026-06-11

AI Technical Summary

⚠Technical Problem

Existing methods are unable to efficiently reduce carbon monoxide concentration in hydrogen-containing gases to sub-ppm levels under low-temperature and low-pressure conditions, which is necessary for effective ammonia synthesis and other applications like fuel cells, leading to catalyst poisoning and inefficiencies.

⚗Method used

A method involving a solid adsorbent composed of an oxide containing Fe, Al, and K, with a Cu content of 0.15% by mass or less, which reduces carbon monoxide concentration in hydrogen-containing gases to below sub-ppm levels under 100°C by contacting the gas with the adsorbent, and optionally heating to desorb carbon monoxide.

🎯Benefits of technology

The method effectively suppresses catalyst poisoning, enabling efficient ammonia synthesis and fuel cell performance by maintaining catalytic activity under low-temperature and low-pressure conditions, and reducing carbon monoxide concentration to sub-ppm levels without significant hydrogen oxidation.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The present invention provides a novel method capable of efficiently reducing the concentration of carbon monoxide in a hydrogen-containing gas. Provided is a method for reducing the concentration of carbon monoxide in a hydrogen-containing gas that comprises (X) a step for bringing a hydrogen-containing gas into contact with a solid adsorbent under temperature conditions below 100°C, the method being characterized in that the solid adsorbent satisfies at least one of conditions (1) and (2):　(1) comprises an oxide containing Fe, Al, and K (provided that the Cu content is 0.15 mass% when the mass of the entire oxide is taken as 100 mass%); and　(2) exhibits the catalytic activity for ammonia synthesis.
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