Bifunctional Catalyst for CO2 Hydrogenation via Cobalt-Nitrogen Coordination
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Solution Overview
Problem
Current catalysts for hydrogenating carbon dioxide lack bifunctional activity for simultaneous reverse water gas shift and Fischer-Tropsch reactions, leading to reduced efficiency and catalyst longevity due to oxide support bonding issues.
Innovation Solution
A bifunctional catalyst with a carbon composite support containing cobalt and nitrogen atoms, along with metal particles dispersed on its surface, promoting both reverse water gas shift and Fischer-Tropsch synthesis reactions, manufactured through a process involving cobalt precursors, nitrogen coordination, and acid treatment to enhance catalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If oxide support is used in catalyst, then catalytic activity is improved, but catalyst longevity deteriorates due to bonding issues
Solution Approach 1:
The patent changes the chemical composition parameters of the support material from traditional oxides to carbon-based materials (carbon nanotubes, graphene, activated carbon). This parameter change eliminates the bonding issues that occur with oxide supports while maintaining high surface area and catalytic activity, thereby improving both productivity and longevity.
Solution Approach 2:
The patent creates composite catalyst structures by combining metal particles (Fe, Co, Ni) with carbon-based support materials. This composite approach leverages the high surface area and chemical stability of carbon materials while providing active sites for catalysis, resolving the contradiction between activity and longevity.
2Device complexity
If single-function catalyst is used, then reaction mechanism is simple, but hydrogenation efficiency deteriorates
Solution Approach 1:
The patent develops bifunctional catalysts that can perform both reverse water gas shift reaction and Fischer-Tropsch synthesis reaction. By incorporating specific metal particles (Fe, Co, Ni) with appropriate promoters on carbon supports, the catalyst achieves multi-functionality, enabling simultaneous CO2 conversion to CO and subsequent hydrocarbon synthesis, thereby improving hydrogenation efficiency without excessive complexity.
Solution Approach 2:
The patent merges two separate catalytic functions (RWGS and FTS) into a single catalyst system. By combining metal particles with specific carbon support structures and promoters, the invention creates an integrated catalyst that performs both reaction steps sequentially, improving overall hydrogenation efficiency while maintaining manageable complexity through synergistic design.
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 enables efficient single-step hydrogenation of carbon dioxide into hydrocarbons with improved reaction activity and longevity by leveraging cobalt-nitrogen coordination and metal particle dispersion on the carbon composite support.
Implementation Method 1
a carbon composite support including cobalt (Co) and nitrogen (N) atoms forming a coordinate bond with the cobalt
Implementation Method 2
metal particles which exhibit a catalytic activity for a Fischer-Tropsch synthesis reaction
Implementation Method 3
a first step of converting carbon dioxide supplied as a reactant into carbon monoxide using a reverse water gas shift (RWGS) reaction
Implementation Method 4
a second step of bonding the generated carbon monoxide to hydrogen using a Fischer-Tropsch (FTS) reaction to perform conversion into a hydrocarbon
Data Source
AI summary
The present disclosure relates to a bifunctional catalyst for manufacturing a hydrocarbon from carbon dioxide and hydrogen. The bifunctional catalyst includes a carbon composite including cobalt (Co) and nitrogen (N) atoms forming a coordinate bond with the cobalt, and metal particles which exhibit a catalytic activity for a Fischer-Tropsch synthesis reaction and which are dispersed on the inner pore surface and/or the outer surface of the carbon composite support, thus simultaneously promoting a reverse water gas shift reaction and the Fischer-Tropsch synthesis reaction.