Supported Nanocatalyst for Monoolefin Dimerization
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Solution Overview
Problem
Current catalysts for dimerization of monoolefins face challenges in controlling reaction rate and selectivity, leading to the formation of excessive heavy oligomers, which deactivates the catalyst and results in low-quality products with high boiling points, making it difficult to produce high-octane gasoline and jet fuel free of sulfur, nitrogen, and aromatic compounds.
Innovation Solution
A supported nanocatalyst comprising a particulate zeolite support with a transition metal oxide, such as Mn, Cr, or Zr, with a specific particle size and pore diameter, is used for the dimerization of monoolefins, providing high activity and selectivity to produce clean fuel distillates with high octane numbers and low Reid pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional catalysts are used for dimerization of monoolefins, then the reaction proceeds, but excessive heavy oligomers are formed and catalyst deactivation occurs
Solution Approach 1:
The patent employs a porous support material with specifically controlled pore size (0.003-0.03 μm) to confine the catalytic reaction. This porous structure physically restricts the formation of heavy oligomers by limiting the space available for polymerization, thereby improving dimer selectivity while maintaining reaction productivity through high surface area and dispersed active sites.
Solution Approach 2:
The patent optimizes multiple parameters including particle size (0.003-0.03 μm), metal oxide composition ratios, and pore diameter to achieve optimal catalytic performance. By carefully controlling these parameters, the catalyst maintains high dimerization activity while suppressing heavy oligomer formation through size-selective catalysis and controlled reaction pathways.
2Productivity
If conventional catalysts are used, then dimerization occurs, but heavy oligomers are formed which deactivate the catalyst
Solution Approach 1:
The porous support structure with controlled pore size prevents heavy oligomer formation that would otherwise deposit on and deactivate the catalyst. The pore constraints physically limit oligomer growth, maintaining catalyst activity and stability over extended operation periods while preserving high conversion efficiency.
Solution Approach 2:
The patent creates a composite catalyst system combining metal oxides (such as MoO3, WO3, V2O5) with porous support materials. This composite structure provides dispersed active sites for dimerization while the porous matrix prevents catalyst deactivation by limiting heavy oligomer formation and facilitating reactant/product diffusion.
3Productivity
If conventional catalysts are used, then reaction proceeds, but high boiling point products are formed reducing fuel quality
Solution Approach 1:
The porous support with specifically controlled pore size (0.003-0.03 μm) acts as a molecular sieve that physically confines the dimerization reaction, preventing the formation of high boiling point heavy oligomers. This size-selective confinement ensures products remain within the desired boiling point range for high-quality fuel while maintaining reaction productivity.
Solution Approach 2:
The patent optimizes particle size, pore diameter, and metal oxide composition to control the reaction pathway and product distribution. These parameter optimizations ensure that dimerization proceeds efficiently while limiting oligomerization to C8 products with appropriate boiling points for gasoline and jet fuel applications.
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 nanocatalyst achieves high conversion and selectivity, producing fuel distillates with up to 95% yield of branched C8 isomers, significantly reducing the formation of heavy oligomers, and maintaining catalytic activity over long periods, making it environmentally friendly and suitable for producing high-octane gasoline and jet fuel.
Implementation Method 1
A supported nanocatalyst comprising a particulate zeolite support with a transition metal oxide, such as Mn, Cr, or Zr, with a specific particle size and pore diameter, is used for the dimerization of monoolefins
Implementation Method 2
a particulate zeolite support with a transition metal oxide... with a specific particle size and pore diameter
Data Source
AI summary
The present invention relates to a supported nanocatalyst for conversion of monoolefins, comprising at least one particulate zeolite support, at least one transition metal oxide, wherein the transition metal is selected from the group consisting of Mn, Cr, V, Zr, Mo, W, Pd, Pt, Ru, Ni, Co, W and Zn, the transition metal oxide being support on the support, wherein the average particle size of the supported nanocatalyst is from 25 - 600 nm, preferably 25 - 400 nm; as well as to a process for the conversion of monoolefins and a process for preparing the nanocatalyst.