Ruthenium Catalyst on Lanthanum-Cerium-Zirconium Oxide for Selective CO Methanization
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Solution Overview
Problem
Current catalysts for selective methanization of carbon monoxide in hydrogen- and carbon dioxide-containing streams lack sufficient selectivity and are active only within a narrow temperature range, making them unsuitable for industrial implementation in fuel cell applications where low CO concentrations are required.
Innovation Solution
A catalytically active composition comprising ruthenium as the active component and lanthanum-cerium-zirconium oxide as the support material, which maintains selectivity over a wide temperature range and is stable for prolonged use, allowing for efficient CO methanization without significant hydrogen loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional CO methanization catalysts are used, then CO removal is achieved, but CO2 is also converted to methane consuming excessive hydrogen
Solution Approach 1:
The catalyst employs different materials with specific local functions: Rhodium provides CO methanization activity, while the perovskite support material selectively adsorbs CO2 and prevents its conversion. This local differentiation of properties between catalyst components resolves the selectivity problem.
Solution Approach 2:
The perovskite support material acts as an intermediary that selectively binds CO2, preventing it from reaching the Rhodium active sites. This intermediary mechanism blocks the unwanted CO2 methanization pathway while allowing CO to be converted.
2Temperature
If conventional catalysts are used, then CO methanization occurs, but only within a narrow temperature range
Solution Approach 1:
The perovskite support material exhibits stable CO2 adsorption properties across a wide temperature range (200-400°C). This parameter stability allows the catalyst to maintain high selectivity and activity under varying thermal conditions, resolving the temperature adaptability issue.
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 ruthenium-based catalyst on lanthanum-cerium-zirconium oxide support achieves significant depletion of CO to less than 10 ppm with minimal hydrogen loss, maintaining high selectivity and activity across a broad temperature range, enabling stable and thermally integrated operation for fuel cell applications.
Implementation Method 1
A catalytically active composition which comprises ruthenium as the active component and a lanthanum-cerium-zirconium oxide as the support material for the selective methanization of carbon monoxide
Implementation Method 2
CO+3H2→CH4+H2O ΔH=−206.2 kJ/mol
Data Source
AI summary
The invention relates to the use of a catalytic composition for selective methanization of carbon monoxide in hydrogen- and carbon dioxide-containing streams, wherein the active component used is ruthenium and the support material is a lanthanum-cerium-zirconium oxide, where the total loading of the support material with the active component is 0.1 to 20% by weight, based on the total weight of the catalytically active composition, and the support material comprises a lanthanum oxide content of 0.1 to 15% by weight, a cerium oxide content of 0.1 to 15% by weight and a zirconium oxide content of 30 to 99.8% by weight, based on the weight of the overall support material.