Carbon-Supported Metal Catalyst for Low-Temperature Ammonia Cracking

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Solution Overview

Problem

The high temperature and costly noble metal catalysts required for ammonia decomposition limit the widespread adoption of ammonia as a hydrogen carrier, necessitating a more efficient and cost-effective method for converting ammonia into hydrogen and nitrogen.

Innovation Solution

A method using a carbon material supported metal catalyst, such as ruthenium on carbon, operates at lower temperatures (200 to 600°C) to decompose ammonia into hydrogen and nitrogen, with the catalyst being regenerated and maintained free of agglomerated and sintered particles, and utilizing a reactor design that simultaneously decomposes ammonia and separates hydrogen.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If high temperature (700-800°C) and noble metal catalysts are used for ammonia decomposition, then decomposition efficiency is improved, but energy consumption and cost increase

Engineering Contradiction:

Improveammonia decomposition efficiencyVSAvoidenergy consumption

Core Design Contradiction:

ProductivityVSUse of energy by stationary object

Solution Approach 1:

The patent changes the temperature parameter from conventional 700-800°C down to 200-600°C by using a carbon-supported metal catalyst (Ru-C, Pt-C, Pd-C, Ni-C, Co-C, Fe-C, or their alloys). This parameter change enables efficient ammonia decomposition at lower temperatures, directly resolving the contradiction between decomposition efficiency and energy consumption

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces expensive noble metal catalysts with carbon-supported metal catalysts where the metal loading is 0.1-50 wt%. The carbon support provides a cost-effective alternative to traditional noble metal catalysts while maintaining catalytic activity, reducing both material cost and energy requirements

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Productivity

If high temperature (700-800°C) is used for ammonia decomposition, then decomposition efficiency is improved, but operational cost increases

Engineering Contradiction:

Improveammonia decomposition efficiencyVSAvoidoperational cost

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent changes the temperature parameter from 700-800°C to 200-600°C using carbon-supported metal catalysts, which directly reduces operational costs including energy bills and equipment maintenance while maintaining high decomposition efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses carbon-supported metal catalysts (0.1-50 wt% metal loading) as a cost-effective alternative to expensive noble metal catalysts, significantly reducing material costs and making the process economically viable for large-scale ammonia decomposition

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If conventional noble metal catalysts are used, then catalytic activity is maintained, but catalyst cost increases

Engineering Contradiction:

Improvecatalytic activityVSAvoidcatalyst cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent creates composite catalysts by combining metals (Ru, Pt, Pd, Ni, Co, Fe or their alloys) with carbon supports. This composite structure maintains catalytic activity through the metal component while the carbon support provides structural stability and cost advantages, resolving the contradiction between reliability and cost

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent replaces expensive noble metal catalysts with carbon-supported metal catalysts where metal loading is optimized at 0.1-50 wt%. This substitution dramatically reduces catalyst material cost while maintaining effective catalytic activity for ammonia decomposition

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 method achieves efficient ammonia decomposition to hydrogen and nitrogen at lower temperatures, with high conversion rates and catalyst regeneration, suitable for large-scale production.

Implementation Method 1

contact the NH3-containing feed gas stream with the reduced M-C catalyst at a temperature of about 200 to about 600° C. thereby converting at least a portion of the NH3 to H2 and N2

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 2

separating the H2 from the residue gas stream to generate a H2-containing product gas stream

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS20250387779A1Method for ammonia decomposition using carbon material supported metal catalyst

Publication Date: 2025.12.25 SAUDI ARABIAN OIL CO

AI summary

A method for decomposing ammonia (NH3) to hydrogen (H2) and nitrogen (N2) includes contacting a H2-containing feed gas stream with a carbon material supported metal (M-C) catalyst at a temperature of about 500° C. to form a reduced M-C catalyst; contacting an NH3-containing feed gas stream with the reduced M-C catalyst at a temperature of about 200 to about 600° C. thereby converting at least a portion of the NH3 to H2 and N2, and regenerating the M-C catalyst to form a regenerated M-C catalyst, and producing a residue gas stream leaving the reactor; and separating the H2 from the residue gas stream to generate a H2-containing product gas stream. The regenerated M-C catalyst is substantially free of agglomerated particles and sintered particles.