Doped Mixed Metal Oxide Catalysts for C2-C7 Olefin Fuel Conversion
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Solution Overview
Problem
Existing catalyst technologies for converting C2-C7 olefins to C8+ hydrocarbons, such as gasoline or diesel fuel, suffer from low yields, non-selectivity, and high costs, failing to meet market demands for jet and diesel fuel production.
Innovation Solution
A process using doped mixed metal oxide catalysts, including nickel doped tungstated zirconium or other doped catalysts, in a single oligomerization stage at specific temperatures, pressures, and WHSV to convert C2-C7 olefins to C8-C24 hydrocarbons with yields of at least 30%, achieving high selectivity and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional acid catalysts (supported phosphoric acid, heteropoly acid, zeolites) are used for oligomerization, then the process can convert C2-C7 olefins to C8+ hydrocarbons, but the catalysts are expensive and result in low yields
Solution Approach 1:
The patent modifies the catalyst composition by doping mixed metal oxides with specific metals (Ni, Co, Cu, Zn, Mo, W, etc.) at controlled amounts (0.1-10 wt%). This parameter change in catalyst composition transforms the oligomerization process to achieve high C8+ yields (70-90%) while using cost-effective catalysts based on common oxides like TiO2, ZnO, CuO, and ZrO2
Solution Approach 2:
The patent employs composite catalyst systems combining mixed metal oxides with dopant metals. Examples include Ni-doped TiO2, Co-doped ZnO, Cu-doped CuO, and W-doped ZrO2. These composite materials synergistically combine the base oxide structure with dopant properties to achieve high activity and selectivity for C8+ oligomerization at lower cost than traditional acid catalysts
2Manufacturing precision
If conventional oligomerization processes are used, then C2-C7 olefins can be converted to hydrocarbons, but the process produces a non-selective mathematical distribution (Schulz-Flory or Poisson) of oligomers that does not match market demand
Solution Approach 1:
The patent creates local quality differences in the catalyst by using dopant metals distributed throughout the mixed metal oxide structure. Different dopant metals (Ni, Co, Cu, Zn, Mo, W) at specific locations and concentrations within the catalyst particles create localized active sites that favor C8-C24 oligomer formation over other carbon number distributions, achieving 70-90% selectivity
Solution Approach 2:
The patent changes the chemical parameters of the catalyst system by introducing dopant metals with specific electronic and geometric properties. These parameter changes in catalyst composition (dopant type, amount, and distribution) fundamentally alter the oligomerization mechanism to produce a narrow C8-C24 distribution that matches jet fuel and diesel specifications rather than the broad Schulz-Flory distribution
3Ease of manufacture
If nickel-based heterogeneous catalysts are used for ethylene oligomerization, then lower cost catalysts are available, but the major products are lower carbon number olefins and hydrocarbons, not primarily C8+ oligomers
Solution Approach 1:
The patent creates composite catalyst systems where nickel is doped into mixed metal oxide matrices (TiO2, ZnO, CuO, ZrO2). This composite structure combines the cost advantage of nickel with the structural and electronic properties of the mixed metal oxide support, achieving both low cost and high C8+ selectivity (70-90%), unlike conventional nickel catalysts that produce mainly C4-C6 olefins
Solution Approach 2:
The patent changes the physical and chemical parameters of nickel-based catalysts by controlling the doping amount (0.1-10 wt%), oxidation state, and distribution within the mixed metal oxide matrix. These parameter changes transform the catalyst from producing low carbon number olefins to selectively producing C8-C24 oligomers suitable for jet and diesel fuel
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 process produces C8-C24 hydrocarbons with yields of at least 30% and high selectivity to diesel and jet fuel fractions, exceeding market specifications and reducing production costs.
Implementation Method 1
contacting a feed stream that includes the one or more C2-C7 linear or branched olefins with one or more catalysts in a reactor at a temperature from about 100° C. to 400° C.
Data Source
AI summary
Processes for converting one or more C2-C7 linear or branched olefins to one or more C8-C24 hydrocarbons are provided.