Carbon Nanotube Supported Catalyst for Alkene Oligomerization
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Solution Overview
Problem
Current alkene oligomerization technologies face challenges with product separation and catalyst recyclability, particularly when dealing with heavy olefins, and existing supports like zeolites and metal-organic frameworks often require high operating temperatures and exhibit diminished activity.
Innovation Solution
The use of carbon nanotubes (CNTs) as a support for transition metal catalysts, such as iron, nickel, and chromium, which are anchored via covalent bonds, electrostatic interactions, or π-π stacking, enabling efficient oligomerization of alkenes with three or more carbon atoms, including dimerization and trimerization reactions, and facilitating catalyst recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If existing supports like zeolites and metal-organic frameworks are used for catalyst anchoring, then catalyst stability is improved, but operating temperature increases and catalyst activity diminishes
Solution Approach 1:
The patent changes the fundamental parameter of the support material from traditional zeolites and metal-organic frameworks to carbon nanotubes, which have different thermal and catalytic properties. This material substitution allows the catalyst to operate at lower temperatures while maintaining stability, as carbon nanotubes provide a stable platform that does not require high temperatures for structural integrity or catalytic activity
2Stability of the object's composition
If existing supports like zeolites and metal-organic frameworks are used for catalyst anchoring, then catalyst stability is improved, but catalyst activity diminishes
Solution Approach 1:
The patent changes the support material parameter from zeolites/MOFs to carbon nanotubes, which have superior electrical conductivity and surface properties. These parameter changes in the support material lead to enhanced catalyst activity while maintaining stability, as the carbon nanotube support better facilitates electron transfer and reactant adsorption
Solution Approach 2:
The patent creates a composite material system by anchoring transition metal catalysts onto carbon nanotube supports. This composite structure combines the stability of the carbon nanotube framework with the high activity of transition metals, achieving both catalyst stability and activity simultaneously through synergistic material combination
3Productivity
If homogeneous catalysts are used for alkene oligomerization, then catalyst activity is high, but product separation and catalyst recyclability become difficult
Solution Approach 1:
The patent extracts the catalyst from the homogeneous liquid phase and anchors it onto solid carbon nanotube supports. This extraction of the catalyst onto a solid support enables easy separation from the reaction mixture through filtration or decantation, while the catalyst retains its high activity at the solid-liquid interface
Solution Approach 2:
The carbon nanotube acts as an intermediary carrier that bridges the advantages of both homogeneous and heterogeneous catalysis. It provides a solid support structure for easy separation while maintaining the high catalytic activity through proper catalyst anchoring, serving as a mediator between the catalyst and reaction medium
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
This approach enhances catalyst stability and activity, allowing for high reactivity in alkene oligomerization, such as achieving 94% 1-hexene consumption and 65% selectivity towards C12 dimers, while maintaining catalyst recyclability and reducing operational temperatures.
Implementation Method 1
the catalyst system catalyzes an alkene oligomerization reaction
Implementation Method 2
the catalyst complex comprises a transition metal
Implementation Method 3
the catalyst complex is supported on a plurality of CNTs via a method selected from the group consisting of: a covalent bond, an electrostatic bond, and π-π stacking
Implementation Method 4
the catalyst complex is supported on a plurality of CNTs via a method selected from the group consisting of: a covalent bond, an electrostatic bond, and π-π stacking
Implementation Method 5
the catalyst complex is supported on a plurality of CNTs via a method selected from the group consisting of: a covalent bond, an electrostatic bond, and π-π stacking
Data Source
AI summary
Systems and methods for multifunctional catalyst systems supported on carbon nanotubes (CNTs) for olefin oligomerization are described. The catalyst systems can directly convert CO2 to jet-range (C12-C18) hydrocarbons. This conversion can be achieved by a cooperative, tandem catalyst system supported on CNTs converting CO2 to olefins (C2-C9) with the catalyst systems followed by oligomerization.