Nickel Oxide Oligomerization Catalyst Eliminating TiO2
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Solution Overview
Problem
Nickel-based heterogeneous catalysts for olefin oligomerization suffer from reduced catalytic activity and increased formation of unwanted branched oligomers due to the addition of titanium dioxide and/or zirconium dioxide, which also lowers the percentage of aluminum/aluminum oxide, affecting conversion and selectivity.
Innovation Solution
An oligomerization catalyst comprising nickel oxide, an Al-free and Si-containing binder, and an amorphous silica-alumina support material with a specific ratio of tetrahedral to octahedral coordinated aluminum atoms, optimized to enhance mechanical strength and catalytic performance by eliminating titanium dioxide and zirconium dioxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If titanium dioxide and/or zirconium dioxide are added to the nickel-based catalyst, then the catalyst structure is stabilized, but the catalytic activity and conversion are reduced
Solution Approach 1:
The invention removes titanium dioxide and zirconium dioxide from the catalyst composition to eliminate their negative impact on catalytic activity and conversion, while maintaining catalyst structure stability through alternative compositional adjustments
Solution Approach 2:
The invention changes the compositional parameters by eliminating TiO2 and ZrO2 and adjusting the nickel oxide content to 10-70 wt% and aluminum oxide to 0-20 wt%, thereby optimizing the balance between structural stability and catalytic activity
2Stability of the object's composition
If titanium dioxide and/or zirconium dioxide are added to the nickel-based catalyst, then the catalyst structure is stabilized, but the formation of unwanted branched oligomers increases
Solution Approach 1:
The invention extracts and removes titanium dioxide and zirconium dioxide from the catalyst system, which eliminates their role in promoting unwanted branched oligomer formation while preserving the essential catalytic function
Solution Approach 2:
The invention modifies the chemical composition parameters by eliminating TiO2 and ZrO2 components and adjusting the ratios of NiO (10-70 wt%) and Al2O3 (0-20 wt%), thereby changing the catalytic pathway to reduce harmful branched oligomer formation
3Quantity of substance
If the percentage of aluminum oxide is reduced due to addition of titanium dioxide and/or zirconium dioxide, then the catalyst composition is adjusted, but the selectivity and conversion are negatively affected
Solution Approach 1:
The invention optimizes the aluminum oxide content parameter within 0-20 wt% and nickel oxide within 10-70 wt%, creating a compositional parameter space that achieves high selectivity and conversion without requiring excessive aluminum oxide that would reduce other critical components
Solution Approach 2:
The invention creates a composite catalyst system combining nickel oxide, aluminum oxide, and silica-alumina support in optimized proportions, where the synergistic interaction between components achieves high catalytic performance without relying on high aluminum oxide content
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 selectivities and conversions without compromising catalyst lifespan, with a specific surface area, pore distribution, and coordinative properties that improve oligomerization outcomes.
Implementation Method 1
the catalytic activity of nickel-based heterogeneous catalysts for the oligomerization of olefins, especially olefins having 3 to 6 carbon atoms, is based on the interaction between nickel cations and surface aluminium atoms
Data Source
AI summary
The invention relates to an oligomerization catalyst comprising nickel oxide and silica-alumina support material and to a process for oligomerization of C3- to C6-olefins using the oligomerization catalyst.