Mesoporous Composite Oxide Catalyst for Butane Dehydrogenation
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Solution Overview
Problem
Current catalysts for oxidative dehydrogenation of normal-butene have limitations in achieving high conversion ratios and selectivity for 1,3-butadiene production, with conventional bismuth-molybdate catalysts exhibiting low surface areas and economic inefficiencies due to high production costs and energy consumption.
Innovation Solution
A mesoporous composite oxide catalyst is developed by incorporating porous silica into a multi-component bismuth-molybdate catalyst, enhancing the surface area and catalytic performance through a specific preparation method involving co-precipitation and thermal treatment, thereby improving the conversion ratio and yield of 1,3-butadiene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If co-precipitation method is used to prepare multi-component bismuth-molybdate catalyst, then production cost is reduced and purity is improved, but surface area decreases and particle uniformity deteriorates
Solution Approach 1:
The patent creates a composite catalyst system combining multi-component bismuth-molybdate oxide with mesoporous silica support. The silica component provides the high surface area and porous structure, while the bismuth-molybdate oxide maintains its catalytic activity. This composite approach allows the catalyst to achieve both low cost (from co-precipitation of metal oxides) and high surface area (from mesoporous silica), resolving the technical contradiction between manufacturing ease and surface area.
2Stability of the object's composition
If high baking temperature is applied to form crystal phase of composite oxide catalyst, then crystal phase formation is improved, but surface area is reduced
Solution Approach 1:
The patent incorporates mesoporous silica material into the catalyst structure. The mesoporous structure provides a three-dimensional network with high surface area and controlled pore sizes. This porous framework allows the catalyst to maintain high surface area even after thermal treatment, as the silica structure is stable and preserves its porosity at the baking temperatures required for crystal phase formation of the metal oxide components.
3Reliability
If conventional bismuth-molybdate catalyst is used for oxidative dehydrogenation, then catalytic activity is achieved, but conversion ratio and selectivity for 1,3-butadiene are limited
Solution Approach 1:
The patent develops a composite catalyst combining bismuth-molybdate oxide with additional metal oxides (such as cobalt, nickel, or iron) and mesoporous silica. The multi-component oxide system enhances the catalytic activity for oxidative dehydrogenation, while the mesoporous structure improves mass transfer and accessibility of reactants to active sites. This composite approach increases both the conversion ratio of butene and the selectivity for 1,3-butadiene production.
4Reliability
If multi-component bismuth-molybdate catalyst with various metal components is used, then catalytic activity is improved, but production cost increases
Solution Approach 1:
The patent utilizes mesoporous silica as a support material that provides high surface area and porous structure. This allows the use of smaller amounts of expensive metal components while maintaining high catalytic activity, as the porous structure increases the dispersion and accessibility of the metal active sites. The silica support itself is cost-effective and provides structural stability, reducing the need for large quantities of precious metal components.
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 mesoporous composite oxide catalyst achieves a higher surface area and improved catalytic performance, increasing the conversion ratio and yield of 1,3-butadiene while reducing metal usage and production costs, thus enhancing economic efficiency.
Implementation Method 1
a high surface area by introduction of certain porous silica, thereby improving conversion ratio of butene
Implementation Method 2
Co-precipitation is generally used in the preparation of the multi-component metal oxide catalyst such as bismuth-molybdate catalyst. The co-precipitation is a method of preparing catalysts by mixing two or more metal solutions under control of pH and inducing precipitation
Implementation Method 3
a high baking temperature is required to form a crystal phase of the composite oxide catalyst
Data Source
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AI summary
Disclosed are a mesoporous composite oxide catalyst, a method for preparing the same and a method for synthesizing 1,3-butadidne using the same. The surface area is increased by introducing certain porous silica into preparation of a catalyst for synthesizing 1,3-butadiene, thereby improving a conversion ratio of butane, and selectivity and yield of 1,3-butadiene, and providing economic efficiency from the viewpoint of decreasing an amount of used metal and reducing catalyst production cost.