Steam-Treated Ammonia Decomposition Catalyst for Moisture Stability

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Solution Overview

Problem

Existing ammonia decomposition catalysts suffer from reduced performance due to moisture, leading to decreased hydrogen production efficiency and stability issues.

Innovation Solution

A catalyst is prepared by forming a carrier using a mixture of lanthanum and aluminum oxide, treated with steam to create a complex oxide with a perovskite structure, and supporting a catalytically active metal like ruthenium on this carrier, enhancing moisture stability and activity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional ammonia decomposition catalysts are used, then ammonia decomposition can occur, but the catalyst performance decreases due to moisture in ammonia gas

Engineering Contradiction:

Improvecatalyst stabilityVSAvoidmoisture sensitivity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies steam treatment (exposing to moisture) during catalyst preparation to convert the harmful effect of moisture into a beneficial one. The steam treatment modifies the carrier surface properties and forms protective layers that prevent moisture from deactivating the catalyst during actual operation, thus converting the harmful moisture exposure into a protective pre-conditioning process

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent uses composite material structures combining metal oxides (such as perovskite-type LaMgO3) with catalytically active metals. This composite structure provides both the structural stability needed to resist moisture and the catalytic activity for ammonia decomposition, resolving the contradiction between stability and moisture sensitivity

Inventive Principle:

Principle #40Composite materials

2Reliability

If steam treatment is performed on the metal oxide mixture, then moisture stability is improved, but treatment time and energy consumption increase

Engineering Contradiction:

Improvemoisture stabilityVSAvoidsteam treatment energy

Core Design Contradiction:

ReliabilityVSUse of energy by stationary object

Solution Approach 1:

The patent optimizes steam treatment parameters including temperature (400-700°C), time (1-24 hours), and steam concentration to achieve the desired moisture stability with minimal energy input. By carefully controlling these parameters, the treatment achieves maximum effect at reduced energy consumption compared to conventional prolonged high-temperature treatments

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The catalyst maintains high ammonia decomposition rates and stability even under moisture conditions, with improved catalytic activity and extended lifespan.

Implementation Method 1

the aluminum oxide may react with lanthanum by the steam treatment to be converted into the lanthanum and aluminum-containing complex oxide

Methodology Applied

Scientific EffectChemical reaction: Chemical Bonding

Implementation Method 2

the heterogeneous metal oxide having a porous structure or a structural defect

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 3

the catalytically active metal may be supported on the surface of the carrier by performing heat treatment on the carrier and the catalytically active metal in a reducing atmosphere

Methodology Applied

Scientific EffectHeat treatment: Heat Treatment

Data Source

PatentUS20260091373A1Catalyst for ammonia decomposition, method of preparing the catalyst, and method of ammonia decomposition using the catalyst

Publication Date: 2026.04.02 SK INNOVATION CO LTD

AI summary

In a method of preparing an ammonia decomposition catalyst according to embodiments of the present disclosure, a mixture of a metal oxide including lanthanum and a heterogeneous metal and aluminum oxide is prepared, the mixture was subjected to steam treatment to form a carrier, and a catalytically active metal is supported on the carrier to prepare an ammonia decomposition catalyst. The ammonia decomposition catalyst according to embodiments of the present disclosure is prepared by the above-described preparation method.