Cobalt Silica Catalyst Preparation for Liquid Synthesis
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Solution Overview
Problem
Existing liquid synthesis catalysts for producing alcohols and hydrocarbons face issues such as poor metal dispersion, high operating pressures, and the generation of waxy products that require further processing, leading to inefficient and costly operations.
Innovation Solution
A method involving the preparation of a catalyst using a silica oxide support, pretreated to remove air and moisture, impregnated with cobalt and optionally ruthenium, and calcined with a specific temperature ramping profile, which is then used in a reactor under moderate conditions to produce liquid products without wax formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional liquid synthesis catalysts are used, then metal dispersion is poor, but improving metal dispersion requires advanced preparation methods that increase process complexity
Solution Approach 1:
The patent applies parameter changes by systematically varying the calcination temperature (e.g., 300°C, 400°C, 500°C) and atmosphere (air, oxygen, nitrogen) to optimize metal dispersion. The specific embodiment of calcining at 400°C in air for 5 hours with a ramping profile (10°C/min) demonstrates how parameter optimization achieves superior cobalt dispersion without complex equipment
Solution Approach 2:
The patent employs preliminary action through the impregnation step where cobalt nitrate solution is applied to the silica support before calcination. This pre-treatment ensures uniform metal distribution on the support surface, and the subsequent controlled calcination converts the impregnated metal salts into well-dispersed metal oxides, achieving good dispersion through a straightforward sequential process
2Productivity
If high to extreme operating pressures are used for optimal results, then synthesis performance improves, but operation costs and reaction vessel material costs increase
Solution Approach 1:
The patent changes the pressure parameter from traditional high/ extreme pressures to moderate pressures (e.g., 50-200 atm). The embodiments demonstrate that by optimizing catalyst composition (Co/Ru on SiO2) and calcination conditions, acceptable synthesis performance is achieved at these lower pressures, reducing both operational costs and equipment material requirements
3Productivity
If previous liquid synthesis catalysts are used, then synthesis can proceed, but waxy products are generated requiring further processing
Solution Approach 1:
The patent changes the product distribution parameters by optimizing catalyst composition (specific Co and Ru ratios) and calcination conditions. These parameter adjustments shift the Fischer-Tropsch synthesis product spectrum toward lighter liquids and away from heavy waxes, reducing the need for additional cracking or processing units
Solution Approach 2:
The patent employs a simplified product specification by targeting direct liquid synthesis products that closely match the desired liquid fuel specifications. By optimizing the catalyst to produce liquids with appropriate chain lengths and compositions, the need for complex downstream processing (cracking, reforming) is minimized or eliminated
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
This approach results in improved metal dispersion, reduced operating costs, and the direct production of liquid products like alcohols and hydrocarbons without the need for additional processing, enhancing efficiency and productivity.
Implementation Method 1
pretreating the silica oxide support to remove air and moisture
Implementation Method 2
pretreating the silica oxide support to remove air and moisture
Implementation Method 3
impregnating the pretreated silica oxide support with cobalt from a cobalt source
Implementation Method 4
calcinating the impregnated silica oxide support in an oven with a temperature ramping profile, wherein the calcinating comprises feeding air into the oven
Implementation Method 5
reducing the liquid synthesis catalyst with H2 gas
Implementation Method 6
activating the liquid synthesis catalyst by introducing a gas stream into the reactor, wherein the gas stream comprises H2 gas and CO from a CO source
Data Source
AI summary
Described herein are catalysts relating to liquid synthesis, methods of their preparation, and methods of their use. In an embodiment according to the present disclosure, a method of producing a catalyst for liquid synthesis comprises: providing a silica oxide support; pretreating the silica oxide support to remove air and moisture; impregnating the pretreated silica oxide support with cobalt from a cobalt source using a cobalt impregnation method; and calcinating the impregnated silica oxide support in an oven with a temperature ramping profile, wherein the calcinating comprises feeding air into the oven.