Cobalt-Molybdenum Sulfide Catalyst for Syngas Conversion
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Solution Overview
Problem
Current catalyst compositions for converting synthesis gas to alcohols, particularly those involving cobalt-molybdenum-sulfide systems, lack clear guidelines on preferred sulfur content and chemical associations, which hinders their performance and efficiency in producing alcohols like ethanol.
Innovation Solution
Catalyst compositions with specific molar ratios of sulfur to cobalt (S:Co) between 1.2 and 4, along with high sulfur content and the presence of base promoters, are developed to enhance the conversion of synthesis gas into C1-C4 alcohols, with the sulfur being associated with cobalt and molybdenum in forms that resist leaching, ensuring effective catalyst activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional cobalt-molybdenum-sulfide catalyst compositions are used without specific sulfur content guidelines, then the catalyst can be manufactured with simpler composition control, but the catalytic activity and alcohol yield are insufficient
Solution Approach 1:
The patent applies parameter changes by establishing specific sulfur-to-cobalt molar ratio ranges (1.2 to 4) and sulfur content ranges (2-10 wt%) to optimize catalytic performance. This quantitative parameter specification transforms the vague conventional composition control into a precise scientific parameter system, thereby improving alcohol yield while maintaining manageable composition control complexity.
Solution Approach 2:
The patent employs composite materials by creating a multi-component catalyst system comprising cobalt, molybdenum, and sulfur in specific ratios, along with optional base promoters and support materials. This composite structure synergistically combines multiple elements to achieve superior catalytic activity and selectivity for alcohol production, resolving the productivity issue without requiring overly complex composition control.
2Reliability
If high sulfur content is used to maintain cobalt in sulfided state, then catalytic activity is enhanced, but the catalyst becomes more susceptible to sulfur leaching
Solution Approach 1:
The patent resolves this contradiction through parameter changes by optimizing the sulfur content to a specific range (2-10 wt%) and controlling the sulfur-to-cobalt molar ratio (1.2 to 4). These parameter specifications ensure sufficient sulfur to maintain cobalt in the active sulfided state while preventing excessive sulfur that would increase leaching susceptibility, thereby balancing catalytic activity and anti-leaching properties.
Solution Approach 2:
The patent applies the copying principle by creating a stable, reproducible catalyst composition model with defined sulfur content and S:Co ratio ranges. This standardized composition blueprint can be consistently replicated in manufacturing, ensuring that each catalyst batch achieves the optimal balance between catalytic activity and leaching resistance without requiring case-by-case optimization.
3Productivity
If precise molar ratios of sulfur to cobalt are specified to optimize performance, then catalytic efficiency is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies parameter changes by defining practical and achievable molar ratio ranges (S:Co from 1.2 to 4) rather than requiring ultra-precise stoichiometric control. These ranges are wide enough to accommodate normal manufacturing variations while still delivering optimized catalytic efficiency, thus improving productivity without significantly complicating the manufacturing process.
Solution Approach 2:
The patent employs partial or excessive action by specifying sulfur content ranges (2-10 wt%) that provide sufficient sulfur to ensure complete sulfidation of cobalt and optimal catalytic performance. This approach uses a moderate excess of sulfur to guarantee complete reaction and active phase formation, simplifying manufacturing control while achieving high catalytic efficiency without requiring precise stoichiometric balance.
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 optimized catalyst compositions significantly improve the yield of alcohols, particularly ethanol, by maintaining cobalt and molybdenum in sulfided states, leading to enhanced catalytic activity and stability, and are resistant to leaching, thus addressing the limitations of existing catalyst systems.
Implementation Method 1
compositions for catalyzing the conversion of syngas into products comprising at least one C1-C4 alcohol
Data Source
AI summary
The present invention provides methods and compositions for the chemical conversion of syngas to alcohols. The invention includes catalyst compositions, methods of making the catalyst compositions, and methods of using the catalyst compositions. Certain embodiments teach compositions for catalyzing the conversion of syngas into products comprising at least one C1-C4 alcohol, such as ethanol. These compositions generally include cobalt, molybdenum, and sulfur. Preferred catalyst compositions for converting syngas into alcohols include cobalt associated with sulfide in certain preferred stoichiometries as described and taught herein.