Nickel-Phosphate Catalyst for High-Temperature Oligomerization
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Solution Overview
Problem
Conventional catalysts for light hydrocarbon alkene oligomerization are sensitive to impurities, temperature, and have low reusability, limiting their effectiveness and stability at high temperatures.
Innovation Solution
A nickel-based catalyst with a phosphate ligand bonded to the nickel metal center, which remains in the +2 oxidation state at temperatures above 500°C, providing stability and high activity for oligomerization of light hydrocarbons to higher molecular weight oligomers without the need for a co-catalyst or activator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional catalysts are used for oligomerization, then the process can proceed at lower temperatures, but the catalysts are sensitive to impurities, temperature, and have low reusability
Solution Approach 1:
The patent changes the chemical parameters of the catalyst by introducing phosphate ligands (such as phosphoric acid, phosphates, or phosphonates) bonded to the nickel metal center. This parameter change enables the catalyst to maintain stability at high temperatures (above 500°C) and resist deactivation by impurities, directly resolving the contradiction between reliability and temperature sensitivity
Solution Approach 2:
The patent creates a composite catalyst structure where nickel is combined with phosphate ligands and supported on solid supports (such as silica, alumina, or zeolites). This composite material approach integrates multiple functions: nickel provides catalytic activity, phosphate provides thermal stability and impurity resistance, and the support provides mechanical stability and reusability, thereby resolving the contradiction between reliability and adaptability
2Productivity
If homogeneous catalysts are used for oligomerization, then high activity and good control of chain length are achieved, but the catalysts are difficult to separate from products and have low reusability
Solution Approach 1:
The patent segments the homogeneous catalyst system into heterogeneous components by supporting the nickel-phosphate complex on solid materials. This segmentation maintains the active nickel centers for high catalytic activity while physically separating the catalyst from the liquid or gaseous reaction mixture, enabling easy separation and product purification
Solution Approach 2:
The solid support acts as an intermediary between the nickel catalyst and the reaction environment. It provides a stable platform that allows the catalyst to function effectively while being easily separable from products. The support mediates between the need for high activity (maintained by nickel) and ease of separation (provided by the solid support structure)
3Temperature
If high temperature oligomerization is performed, then catalyst stability is improved, but conventional catalysts decompose or lose activity at temperatures above 500°C
Solution Approach 1:
The patent changes the thermal stability parameters of the catalyst by incorporating phosphate ligands with strong metal-phosphate bonds. These bonds remain intact at temperatures above 500°C, preventing catalyst decomposition and maintaining compositional stability at high reaction temperatures, thereby resolving the contradiction between temperature and stability
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 nickel-phosphate catalyst enables oligomerization at unprecedented high temperatures, producing stable and active oligomers with a molecular weight range suitable for diesel and jet fuels, while maintaining catalyst stability and activity.
Implementation Method 1
A nickel-based catalyst with a phosphate ligand bonded to the nickel metal center, which remains in the +2 oxidation state at temperatures above 500°C, providing stability and high activity for oligomerization of light hydrocarbons to higher molecular weight oligomers
Data Source
AI summary
An oligomerization catalyst, oligomer products, methods for making and using same. The catalyst can include a supported nickel phosphate compound. The catalyst is stable at oligomerization temperatures of 500° C. or higher and particularly useful for making oligomer products containing C4 to C26 olefins having a boiling point in the range of 170° C. to 360° C.