Dual-Functional Oxide Composition for Reactive CO2 Capture Conversion
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Solution Overview
Problem
Current carbon capture and utilization (CCU) processes are hindered by high energy costs due to the energy-intensive desorption of captured CO2 and associated purification, transport, and pressurization, limiting widespread implementation.
Innovation Solution
Development of dual-functional materials (DFMs) comprising zinc, aluminum, and copper or alkali/alkaline earth metals that enable CO2 conversion to valuable products like methanol and methane at mild conditions, eliminating the need for CO2 desorption and downstream processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional CCU processes are used to convert CO2 to valuable products, then product value is generated, but energy costs are high due to energy-intensive desorption and downstream processes
Solution Approach 1:
The patent combines CO2 capture and conversion functions into a single integrated process using dual-functional materials. The material simultaneously captures CO2 from the gas stream and converts it to valuable products like methanol, eliminating the need for separate desorption and conversion steps. This merging of functions directly reduces energy consumption by removing energy-intensive intermediate steps while maintaining product generation capability
Solution Approach 2:
The dual-functional material performs multiple roles: it acts as both a CO2 capture medium and a catalyst for product formation. This multi-functionality allows the system to achieve both CO2 removal and value-added product synthesis in one operation, addressing the contradiction between energy efficiency and productivity by making the single material responsible for both objectives
2Ease of manufacture
If CO2 is captured and then desorbed for downstream processing, then CO2 can be converted to products, but capital and operating expenses are high
Solution Approach 1:
The dual-functional material performs CO2 capture and conversion in a single step without requiring preliminary desorption. The material is designed to directly transform captured CO2 into valuable products like methanol, CO, or methane in situ, eliminating the need for separate purification and transport steps. This preliminary integration of conversion function reduces both capital and operating expenses while maintaining product conversion efficiency
3Loss of energy
If energy-intensive desorption is used to regenerate the capture material, then CO2 can be recovered, but energy input is high
Solution Approach 1:
The patent changes the operational parameters from requiring high-energy thermal desorption to operating at milder temperatures where the dual-functional material naturally converts captured CO2 to products. By changing the regeneration mechanism from thermal desorption to catalytic conversion at lower temperatures, the system reduces energy input while maintaining reliable CO2 recovery through product formation
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 DFMs achieve reduced capital and operating expenses by directly converting CO2 to valuable products, such as CO, methane, or methanol, while reducing energy input and enhancing process economics.
Implementation Method 1
a reactive carbon capture (RCC) approach, where absorbed/adsorbed CO2 is directly converted to products during the absorbate/adsorbate regeneration step
Implementation Method 2
employ catalysts that enable the conversion of CO2 to more valuable products, such as methanol
Data Source
AI summary
The present disclosure relates to a composition that includes a first oxide that includes zinc, aluminum, and copper; and a metal that includes least one of an alkali metal and/or an alkaline earth metal, where the composition has a first total uptake capacity of CO2 of greater than 218 μmol CO2/g of composition at a first temperature of about 40° C., a second total uptake capacity of CO2 of greater than 76 μmol CO2/g of composition at a second temperature of about 300° C., and the composition is capable of converting CO2 to at least one of CO, methane, or methanol, when exposed to H2 at a third temperature greater than the first temperature.