Oxidative Dehydrogenation Catalyst Surface Composition
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Solution Overview
Problem
Current catalysts for oxidative dehydrogenation of butene require high temperatures and are thermodynamically disadvantageous, leading to low yields of 1,3-butadiene, and the synthesis of multicomponent bismuth-molybdenum catalysts is inefficient in forming catalytically active phases.
Innovation Solution
A catalyst with a surface composition of MoaBibCoc(M1)d(M4)eOf, where the molar content of bismuth is higher than cobalt, is produced using a two-step co-precipitation method, resulting in a high Mo—Bi phase on the surface, enhancing catalytic activity and selectivity at lower temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct dehydrogenation of butene is performed at high temperature to increase conversion rate, then conversion rate is improved, but side reactions increase and yield of 1,3-butadiene decreases
Solution Approach 1:
The invention changes the reaction type from direct dehydrogenation (endothermic) to oxidative dehydrogenation (exothermic), fundamentally altering the thermal parameters and reaction mechanism to achieve high conversion without excessive side reactions
Solution Approach 2:
The invention introduces oxygen as a reactant in oxidative dehydrogenation, using oxidation to drive the dehydrogenation process and eliminate the need for high-temperature endothermic conditions that cause side reactions
2Manufacturing precision
If multicomponent bismuth-molybdenum catalyst is prepared by general co-precipitation method, then catalyst composition is achieved, but catalytically active phase formation is inefficient
Solution Approach 1:
The invention performs preliminary classification of precipitates by particle size before sintering, preparing the catalyst structure in advance to facilitate efficient active phase formation during subsequent heat treatment
Solution Approach 2:
The invention segments the catalyst preparation into distinct steps: co-precipitation, classification by particle size, and sintering, allowing each step to optimize specific properties that collectively enhance active phase formation
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 exhibits high catalytic activity and butadiene selectivity even at relatively low temperatures, outperforming conventional bismuth-molybdenum-based catalysts in oxidative dehydrogenation reactions.
Implementation Method 1
a catalyst for oxidative dehydrogenation of butene... capable of exhibiting high catalytic activity under relatively low temperature reaction conditions
Implementation Method 2
A catalyst with a surface composition of MoaBibCoc(M1)d(M4)eOf... is produced using a two-step co-precipitation method
Data Source
AI summary
A catalyst for oxidative dehydrogenation of butene and a method for producing the same are described. The method includes forming a first coprecipitate, forming a second coprecipitate, and mixing the first and second coprecipitates under conditions that product a catalyst having a favorable surface chemistry profile.