Multifunctional Catalyst for CO2 Conversion
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Solution Overview
Problem
Current technologies face challenges in efficiently converting CO2 into valuable products like CO due to low reactivity and equilibrium limitations, particularly in the reverse water gas shift reaction, requiring high temperatures and pressures, and struggling with catalyst deactivation and separation issues in heterogeneous systems.
Innovation Solution
A multifunctional catalyst comprising a solid water sorbent impregnated with a metal, having a Si/Al molar ratio below 50 and pore diameters of 3 to 20 Å, which allows for higher CO2 conversion selectivity and stability at lenient temperatures and pressures, integrating catalytic and sorption functionalities in a single homogeneous particle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high temperatures (above 800°C) are used to achieve high CO2 conversion via RWGS reaction, then conversion efficiency is improved, but catalyst deactivation occurs and energy consumption increases
Solution Approach 1:
The patent combines the RWGS catalyst and water sorbent into a single integrated particle system. The catalyst promotes CO2 conversion while the sorbent simultaneously removes water product, preventing equilibrium limitations and catalyst deactivation without requiring high temperatures above 800°C
Solution Approach 2:
The invention changes the operating temperature parameter from conventional high temperatures (>800°C) to moderate temperatures (200-400°C) by introducing water sorption functionality that shifts reaction equilibrium and prevents catalyst degradation at lower temperatures
2Productivity
If heterogeneous catalyst-sorbent mixtures are used, then CO2 conversion is enhanced, but separation and processing complexity increases
Solution Approach 1:
The patent merges separate catalyst and sorbent components into a single homogeneous particle where the sorbent is impregnated with metal catalyst. This eliminates the need for separate catalyst-sorbent mixtures and simplifies separation processes while maintaining enhanced conversion performance
3Manufacturing precision
If conventional catalysts are used at low temperatures (300°C), then selectivity towards CO is improved, but conversion efficiency remains insignificant
Solution Approach 1:
The patent combines catalyst and water sorbent in a single particle system, where the sorbent removes water product to shift reaction equilibrium forward. This enables significant CO2 conversion at low temperatures (300°C) while maintaining high CO selectivity, overcoming the limitation of conventional catalysts
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 higher CO2 conversion selectivity and stability, overcoming temperature-induced deactivation and separation issues, enabling efficient production of CO and other valuable products like methanol, ethers, and hydrocarbons under more favorable reaction conditions.
Implementation Method 1
a metal capable of catalysing the conversion of CO2 from a gaseous mixture comprising H2 and CO2 into a useful product
Implementation Method 2
The sorbent is a molecular sieve having a Si/Al molar ratio below 50 and containing pores having a diameter in the range of 3 to 20 Å
Data Source
AI summary
The present invention concerns a multifunctional catalyst for the conversion of CO2 into useful products, such as CO via the reverse water gas shift reaction. The catalyst according to the invention efficiently combined a water sorption functionality with at least one catalytic functionality into a single particle, by having a solid water sorbent impregnated with at least one metal capable of converting CO2 from a gaseous mixture comprising H2 and CO2. The catalyst according to the invention allows for higher selectivity in the conversion of CO2, at more lenient conditions in terms of temperature and pressure, and improved stability of the catalyst itself. The invention also concerns a process for converting CO2, utilizing the catalyst and the use of the catalyst in the conversion of CO2.