Underbedded Overlaid MoCo Catalyst for Low-Temperature Sulfur Conversion
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Solution Overview
Problem
Existing catalysts are ineffective in achieving high percentage conversion of sulfur compounds in gas streams, such as Claus tail gas streams, at low-temperature reaction conditions, and lack optimal metal ratios and preparation methods for enhanced catalytic performance.
Innovation Solution
A catalyst composition comprising underbedded and overlaid molybdenum and cobalt metals, with specific weight ratios and preparation methods, including co-mulling and impregnation steps, to create a catalyst with enhanced catalytic properties for low-temperature hydrolysis and hydrogenation reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional catalysts are used for sulfur compound conversion, then the catalyst structure is simple, but the conversion efficiency at low temperature is insufficient
Solution Approach 1:
The catalyst is segmented into multiple functional layers: a first catalyst layer containing metal compounds (Co, Mo, Ni) for hydrolysis reactions, and a second catalyst layer containing different metal compounds for hydrogenation reactions. This segmentation allows each layer to perform its specific function optimally, achieving high conversion efficiency at low temperatures while maintaining a manageable structural complexity through functional specialization.
Solution Approach 2:
The catalyst employs composite material structure by combining multiple metal compounds (cobalt, molybdenum, nickel) in specific ratios within each layer, and combining different types of catalyst layers. This composite approach creates synergistic effects that enhance catalytic activity and selectivity, enabling high conversion efficiency at low temperatures without excessive structural complexity.
2Productivity
If high temperature is used for sulfur compound conversion, then conversion efficiency improves, but energy consumption increases
Solution Approach 1:
The catalyst changes the optimal temperature parameter for the reaction by providing alternative reaction pathways with lower activation energies. The specific metal compounds and their ratios enable the hydrolysis and hydrogenation reactions to proceed efficiently at temperatures below 200°C, dramatically reducing energy consumption while maintaining high conversion efficiency through enhanced catalytic activity.
Solution Approach 2:
The catalyst acts as an intermediary that facilitates the conversion of sulfur compounds at lower temperatures by providing surface sites for reaction. The metal compounds in the catalyst layers mediate the breaking of C-S bonds and the hydrogenation of intermediates, enabling the overall conversion process to occur at lower temperatures than would be required without catalysis, thus reducing energy input requirements.
3Reliability
If metal content in catalyst is increased, then catalytic activity improves, but catalyst cost and complexity increase
Solution Approach 1:
The catalyst applies local quality by concentrating specific metal compounds in specific layers rather than uniformly distributing all metals throughout. The first layer is enriched with metals suitable for hydrolysis, while the second layer contains metals optimized for hydrogenation. This localized distribution optimizes catalytic activity for each specific reaction type while reducing overall metal content and complexity compared to a homogeneous high-metal catalyst.
Solution Approach 2:
The catalyst employs partial action by using moderate metal content in each layer rather than maximizing metal content throughout. The specific weight ratios of metal compounds are optimized to provide sufficient catalytic activity for the intended conversion efficiency, avoiding the diminishing returns and excessive cost associated with higher metal loadings. This partial optimization achieves reliable performance with reduced 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 enables high conversion of sulfur compounds and carbon monoxide at lower temperatures, allowing for energy savings and increased reactor throughput, with improved catalytic activity compared to conventional catalysts.
Implementation Method 1
The catalyst composition enables high conversion of sulfur compounds and carbon monoxide at lower temperatures, allowing for energy savings and increased reactor throughput, with improved catalytic activity compared to conventional catalysts.
Implementation Method 2
A catalyst composition comprising underbedded and overlaid molybdenum and cobalt metals, with specific weight ratios and preparation methods, including co-mulling and impregnation steps, to create a catalyst with enhanced catalytic properties for low-temperature hydrolysis and hydrogenation reactions.
Implementation Method 3
A catalyst composition comprising underbedded and overlaid molybdenum and cobalt metals, with specific weight ratios and preparation methods, including co-mulling and impregnation steps, to create a catalyst with enhanced catalytic properties for low-temperature hydrolysis and hydrogenation reactions.
Data Source
AI summary
Presented is a catalyst composition having exceptional properties for converting sulfur, sulfur compounds, and carbon monoxide contained in gas streams by catalyzed hydrolysis, hydrogenation and water-gas shift reactions. The catalyst comprises underbedded molybdenum and cobalt with an overlayer of molybdenum and cobalt. These metals are present in the catalyst within certain concentration ranges and relative weight ratios. The underbedded metals are present in the catalyst within a specified range relative to the overlayer and total metals. The underbedded metals are formed by co-mulling an inorganic oxide with the catalytically active metals of molybdenum and cobalt. The co-mulled mixture is calcined and then impregnated with overlaid molybdenum and cobalt.