Single-Atom α-MoC Catalyst for Stable Low-CO Hydrogen Reforming
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional catalysts for methanol aqueous phase reforming suffer from low activity and stability, leading to high CO impurities and inefficiencies in hydrogen production, which are not suitable for hydrogen fuel cells.
Innovation Solution
A metal/α-MoC 1-x supported single-atomic dispersion catalyst is developed, where the metal is dispersed in single-atomic form on α-MoC 1-x support, with specific synthesis steps to ensure high dispersion and stability, using metals like platinum, ruthenium, palladium, nickel, copper, or cobalt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional Cu-based catalysts are used for methanol steam reforming, then high reactivity is achieved, but the active phases are oxidized by steam causing over 40% deactivation
Solution Approach 1:
The patent uses Mo2C as an intermediary support material that mediates between the Cu active phase and steam. The Mo2C support provides stability and resistance to oxidation while maintaining the high reactivity of Cu, solving the contradiction between reactivity and stability under steam reforming conditions
Solution Approach 2:
The invention creates a composite catalyst system combining Cu active phases with Mo2C support material. This composite structure leverages the high reactivity of Cu while the Mo2C support provides structural stability and resistance to steam-induced deactivation, achieving both high productivity and reliability
2Productivity
If noble metal loaded over oxide supports is used to catalyze methanol decomposition, then catalytic activity is improved, but CO impurity exceeds 50% which far exceeds fuel cell tolerance
Solution Approach 1:
The patent changes the support material parameter from conventional oxide supports to Mo2C (molybdenum carbide). This parameter change fundamentally alters the catalytic pathway, maintaining high catalytic activity while suppressing CO formation through the unique electronic and geometric properties of the carbide support, reducing CO impurity to acceptable levels for fuel cells
3Productivity
If steam reforming reaction is performed, then hydrogen is produced, but vaporization of reactants and further purification stacks are required which do not fit for compact system
Solution Approach 1:
The Mo2C-supported catalyst performs multiple functions simultaneously: it catalyzes methanol decomposition, promotes water-gas shift reaction, and suppresses CO formation. This multi-functionality eliminates the need for separate vaporization and purification stacks, reducing system complexity while maintaining hydrogen production efficiency
4Device complexity
If conventional Cu-based catalyst is used for aqueous reforming, then the vaporization stack is removed, but the catalyst cannot be stably present in liquid phase
Solution Approach 1:
The patent employs a robust Mo2C-supported catalyst design that is specifically optimized for liquid-phase stability. The Mo2C support provides structural integrity and resistance to leaching in aqueous environments, enabling the catalyst to maintain stability and activity throughout the aqueous reforming process without requiring complex support structures
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 achieves excellent hydrogen production performance, with improved stability and reduced CO impurities, suitable for hydrogen fuel cells, outperforming conventional catalysts in terms of activity and efficiency.
Implementation Method 1
metal/α-MoC 1-x supported single-atomic dispersion catalyst, synthesis method and applications... excellent hydrogen production performance... outperforming conventional catalysts in terms of activity and efficiency
Data Source
Figure 1~2B
Figure 3(a)~3(d)
Figure 4~5
AI summary
A metal/α-MoC1-x load-type single-atomic dispersion catalyst, a synthesis method therefor, and applications thereof. The catalyst uses α-MoC1-x as carrier, and has metal that has the mass fraction ranging from 1-100% and that is dispersed on carrier α-MoC1-x in the single atom form. The catalyst provided in the present application can be adapted to a wide alcohol/water proportion in hydrogen production based on aqueous-phase reforming of alcohols, outstanding hydrogen production performance can be obtained at a variety of proportions, and catalysis performance of the catalyst is much higher than that of metal loaded with an oxide carrier. Especially when the metal is Pt, catalysis performance of the catalyst provided in the present application in the hydrogen production based on aqueous-phase reforming of alcohols is much higher than that of a Pt/α-MoC1-x load-type catalyst on the α-MoC1-x carrier on which Pt is disposed on a layer form in the prior art. The hydrogen production performance of the catalyst provided in the present application can be higher than 20,000h-1 at the temperature of 190°C.