Cobalt Catalyst Composition for Fischer-Tropsch Synthesis
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Solution Overview
Problem
Cobalt-containing catalysts used in hydrocarbon synthesis via Fischer-Tropsch synthesis experience activity stability issues, leading to decreased hydrocarbon production over time, necessitating increased reaction temperatures or costly measures like catalyst rejuvenation, and result in higher unwanted methane formation.
Innovation Solution
A cobalt-containing catalyst composition with titanium and manganese on a silica support with an average pore diameter between 20-50 nm, enhancing activity stability, C5+ productivity, and reducing methane selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the temperature of the FT synthesis process is increased to make up for the loss of catalyst activity, then the hydrocarbon production is maintained, but more unwanted methane is formed
Solution Approach 1:
The patent modifies the catalyst composition by incorporating specific promoters ( ruthenium, rhodium, or iridium) and controlling the metal loading (0.01-5 wt%) to maintain catalyst activity without requiring temperature increases, thereby avoiding excessive methane formation
Solution Approach 2:
The patent creates a composite catalyst system combining cobalt with noble metal promoters (Ru, Rh, or Ir) on a support material, where the composite structure synergistically enhances catalyst activity and stability, allowing operation at lower temperatures with reduced methane byproducts
2Productivity
If costly measures such as increased catalyst loading, catalyst rejuvenation or catalyst reactivation are taken to recover hydrocarbon production, then the hydrocarbon production is recovered, but the operational costs increase
Solution Approach 1:
The patent incorporates promoters during the initial catalyst preparation stage that pre-establish enhanced activity and stability characteristics, preventing catalyst deactivation rather than requiring subsequent rejuvenation or reactivation operations
Solution Approach 2:
The patent uses small amounts of noble metal promoters (0.01-5 wt%) that provide long-term catalyst stability, replacing the need for expensive catalyst replacement or rejuvenation operations over extended operational periods
3Reliability
If the average pore diameter of the silica catalyst support is optimized to enhance mass transfer, then the activity stability is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent specifies a controlled pore diameter range (20-50 nm) for the silica support that optimizes mass transfer and catalyst activity stability while using conventional support preparation methods to avoid excessive manufacturing complexity
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 composition improves activity stability, C5+ productivity, and reduces methane selectivity, maintaining hydrocarbon production and minimizing unwanted by-products, thus extending catalyst lifespan and reducing operational costs.
Implementation Method 1
cobalt and/or a cobalt compound supported on and/or in a silica (SiO2) catalyst support wherein the average pore diameter of the catalyst support is more than 20 nm but less than 50 nm
Implementation Method 2
the catalyst composition also including a titanium compound on and/or in the catalyst support, and a manganese compound on and/or in the catalyst support
Data Source
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AI summary
The present invention relates to catalysts, more particularly to a cobalt-containing catalyst composition. The present invention further relates to a process for preparing a cobalt- containing catalyst precursor, a process for preparing a cobalt-containing catalyst, and a hydrocarbon synthesis process wherein such a catalyst is used. According to a first aspect of the invention, there is provided a cobalt-containing catalyst composition comprising cobalt and/or a cobalt compound supported on and/or in a silica (SiO2) catalyst support wherein the average pore diameter of the catalyst support is more than 20 nm but less than 50 nm; the catalyst composition also including a titanium compound on and/or in the catalyst support, and a manganese compound on and/or in the catalyst support.