Phosphinamine Ni-UiO-66 Catalyst for Ethylene Dimerization
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Solution Overview
Problem
Commercial catalysts for ethylene dimerization fail to produce 1-butene in high purity and are ineffective under gas phase and continuous flow conditions.
Innovation Solution
A catalyst comprising a metal-organic framework (UiO-66), a phosphinamine ligand (Bis(diaryl/dialkylphosphino amine ligand), and a Ni salt, synthesized through hydrothermal methods and solvent-assisted ligand exchange, providing high selectivity and stability for 1-butene production in gas-phase and continuous flow conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If commercial catalysts are used for ethylene dimerization, then the reaction can proceed, but the purity of 1-butene product is low
Solution Approach 1:
The patent modifies the catalyst structure by incorporating specific ligands (phosphinamine, N-heterocyclic carbene) and metal centers (Pd, Pt, Ni, Rh, Ir) with controlled oxidation states and coordination geometries. This changes the electronic and steric parameters of the catalyst to achieve high 1-butene selectivity (90-99%) while maintaining catalytic activity
Solution Approach 2:
The patent creates composite catalyst systems combining organic ligands with metal centers, and further integrates these into heterogeneous support structures. The composite nature allows synergistic effects between components, achieving both high product purity and reliable catalytic performance that neither component could achieve alone
2Adaptability or versatility
If commercial catalysts are used for ethylene dimerization, then the reaction can proceed, but the catalyst is ineffective under gas phase and continuous flow conditions
Solution Approach 1:
The patent develops catalysts with tunable properties that can be optimized for different operational modes. By adjusting ligand types, metal centers, and support materials, the catalysts achieve high productivity in gas phase and continuous flow conditions where commercial catalysts fail, while maintaining adaptability across different reaction configurations
Solution Approach 2:
The patent creates catalyst systems that function effectively across multiple operational conditions (gas phase, liquid phase, batch, continuous flow). The heterogeneous catalyst design with supported metal complexes provides universal applicability, allowing the same catalyst system to deliver high productivity in diverse industrial reaction scenarios
3Manufacturing precision
If homogeneous catalysts are used for ethylene dimerization, then high selectivity can be achieved, but catalyst separation and recycling is difficult
Solution Approach 1:
The patent introduces heterogeneous supports (silica, alumina, activated carbon, porous materials) as intermediaries to carry the active metal complex catalysts. This intermediary structure maintains the high selectivity of homogeneous catalysts while providing easy separation through filtration or decantation, and enables catalyst recycling without significant activity loss
Solution Approach 2:
The patent utilizes porous support materials with controlled pore sizes and surface areas to immobilize the catalyst complexes. The porous structure provides high surface area for catalyst dispersion, maintaining high selectivity, while enabling easy product-catalyst separation and facilitating catalyst recycling through simple filtration processes
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 high activity and selectivity for 1-butene production in high purity, with reactivity comparable to the best reported catalysts, enabling efficient operation in microreactors under flow conditions and facilitating easy catalyst separation and recycling.
Implementation Method 1
a catalyst for ethylene dimerization includes: (1) a metal-organic framework (e.g., UiO-66); (2) a phosphinamine ligand (e.g., a Bis(diaryl/dialkylphosphino) amine ligand); and (3) a salt (e.g., a Ni salt)
Data Source
AI summary
A catalyst for ethylene dimerization is provided. The catalyst includes a metal-organic framework; a phosphinamine ligand; and a salt.