Combustion in Solution Catalysts for Reverse Water-Gas Shift
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Solution Overview
Problem
Current catalysts for the reverse water-gas shift reaction and partial oxidation of methane to synthesis gas face challenges such as low dispersion of active phases, high deactivation rates, and the need for high catalyst amounts due to lack of internal porosity, as well as high costs associated with noble metal-based catalysts.
Innovation Solution
A method for synthesizing cerium oxide substituted with lanthanides or yttrium/scandium, combined with nanoparticles of precious or semi-precious metals, using the combustion in solution technique, resulting in catalysts with high porosity and dispersion, reducing the need for activation stages and enhancing stability and activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional catalyst preparation methods are used, then catalysts can be produced, but the active phases have low dispersion and require high catalyst amounts
Solution Approach 1:
The patent applies porous materials by incorporating a porous support structure (alumina, silica, or titania) into the catalyst composition. The porous nature of the support provides high surface area and internal porosity, enabling better dispersion of the active phase (precious or semi-precious metals) throughout the catalyst matrix. This increases the effective surface area for catalytic reactions while reducing the total amount of catalyst needed.
Solution Approach 2:
The patent employs composite materials by creating a multi-component catalyst system consisting of precious or semi-precious metal nanoparticles dispersed on a porous oxide support. This composite structure combines the high catalytic activity of noble metals with the high surface area and structural stability of porous oxide supports, achieving both improved dispersion and reduced catalyst quantity requirements.
2Reliability
If conventional catalysts are used, then the reactions can proceed, but deactivation rates are high and stability is poor
Solution Approach 1:
The porous support structure provides thermal stability and mechanical strength, preventing catalyst sintering and structural collapse at high operating temperatures. The porous matrix also physically anchors the active metal particles, preventing their aggregation and migration, thereby maintaining catalytic activity over extended periods and improving overall catalyst lifetime.
Solution Approach 2:
The composite catalyst structure combines thermally stable oxide supports with metal nanoparticles, creating a synergistic system where the support protects the metal particles from deactivation mechanisms such as sintering, aggregation, and support interaction. This composite architecture enhances both short-term stability and long-term durability of the catalyst.
3Productivity
If noble metal-based catalysts are used, then high activity is achieved, but costs are high
Solution Approach 1:
The patent applies this principle by replacing expensive noble metals (such as platinum, palladium, or rhodium) with cheaper semi-precious metals or base metals that can achieve similar catalytic performance when properly dispersed on the porous support. This substitution dramatically reduces catalyst cost while maintaining high productivity through optimized dispersion and surface area.
Solution Approach 2:
The composite catalyst design allows the use of lower-cost metal nanoparticles on high-surface-area porous supports, achieving cost-effective catalysis. The porous support maximizes the utilization of the active metal phase, ensuring high activity even with reduced metal loading, thus providing an economically viable alternative to traditional noble metal catalysts.
4Manufacturing precision
If catalysts without internal porosity are used, then preparation is simpler, but dispersion of active phases is low
Solution Approach 1:
The patent incorporates porous materials with well-defined pore structures (mesoporous or macroporous) into the catalyst design. The porosity is achieved through controlled synthesis methods such as templating or sol-gel processes, creating internal channels and high surface area regions that naturally enhance active phase dispersion. The structured porosity provides pathways for reactant diffusion while maximizing metal particle distribution.
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 synthesized catalysts exhibit high activity by mass for both reactions, with improved stability and reduced hotspot formation, maintaining activity over extended periods and operating conditions, and are more cost-effective compared to noble metal-based alternatives.
Implementation Method 1
A method for synthesizing cerium oxide substituted with lanthanides or yttrium/scandium, combined with nanoparticles of precious or semi-precious metals, using the combustion in solution technique
Implementation Method 2
The combustion in solution (SCS solution combustion synthesis), developed by Patil et al., is based on a reaction of self-sustained combustion (the released heat is greater than that required for the reaction and the reactions are produced at high temperatures) between a fuel and an oxidant
Implementation Method 3
the introduction of L3+ partially substituting Ce4+ induces the generation of oxygen vacancies in the crystal network, which are essential for the fixing of different gas molecules
Data Source
AI summary
The invention relates to a method for producing catalysts by the method of combustion in solution, to the catalysts produced by said method, and to the particular use thereof in the reverse water-gas shift reaction and in the partial oxidation of the methane into synthesis gas. Therefore, it is understood that the present invention pertains to the area of the green industry aimed at the reduction of CO2 on the planet.