Fischer-Tropsch Cobalt Catalyst Partial Reduction
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Solution Overview
Problem
Existing Fischer-Tropsch processes face challenges in maintaining catalyst activity and selectivity for producing hydrocarbons, particularly in reducing methane production and increasing selectivity towards C5+ hydrocarbons, while operating under less energy-intensive conditions.
Innovation Solution
A process involving a titanium dioxide-supported cobalt catalyst with a limited degree of reduction, achieved through pre-treatment with a reducing agent at specific temperatures and gas compositions, to maintain catalyst activity and selectivity without complete reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If complete reduction of cobalt oxide to metallic cobalt is performed, then catalyst activity is maximized, but energy consumption increases and C5+ selectivity decreases
Solution Approach 1:
The patent applies partial reduction by limiting the reduction process to achieve only 30-95% metallic cobalt content instead of complete reduction. This partial action maintains sufficient catalyst activity while avoiding the excessive energy consumption and unwanted side effects of complete reduction, specifically preventing excessive methane formation and preserving C5+ selectivity
2Productivity
If complete reduction of cobalt oxide is performed, then catalyst activity is maximized, but C5+ selectivity decreases and methane production increases
Solution Approach 1:
By performing partial reduction to achieve 30-95% metallic cobalt content rather than complete reduction, the patent avoids generating excessive methane while maintaining acceptable catalyst activity. The controlled, incomplete reduction prevents the harmful side effect of over-reduction without sacrificing essential catalytic function
3Ease of manufacture
If higher reduction temperature is used, then reduction efficiency increases, but catalyst selectivity towards C5+ hydrocarbons decreases
Solution Approach 1:
The patent changes the reduction parameter from complete reduction at high temperature to partial reduction at controlled temperature (220-250°C), achieving sufficient reduction efficiency while preserving C5+ selectivity. This parameter modification allows the process to operate at less energy-intensive conditions with desirable selectivity
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 achieves acceptable and enhanced catalyst activity and C5+ selectivity while reducing energy consumption, maintaining performance even when exposed to syngas at elevated temperatures.
Implementation Method 1
pre-treating a catalyst composition comprising titanium dioxide support and a cobalt compound which is oxidic cobalt, a cobalt compound decomposable thereto by reduction or a mixture thereof, with a reducing agent at a temperature of from 220°C to 250°C to produce the catalyst above
Implementation Method 2
a process for the conversion of a feed comprising a mixture of hydrogen and carbon monoxide to hydrocarbons... with a catalyst comprising titanium dioxide and cobalt
Data Source
AI summary
A process for the conversion of a feed comprising a mixture of hydrogen and carbon monoxide to hydrocarbons, the hydrogen and carbon monoxide in the feed being present in a ratio of from 1 :9 to 9:1 by volume, the process comprising the step of contacting the feed at elevated temperature and atmospheric or elevated pressure with a catalyst comprising titanium dioxide and cobalt wherein the catalyst initially comprises from 30% to 95% metallic cobalt by weight of cobalt.