Mixed Metal Oxide Catalyst for Alkane Dehydrogenation
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Solution Overview
Problem
Existing alkane oxidative dehydrogenation (ODH) and alkene oxidation processes using mixed metal oxide catalysts with molybdenum, vanadium, niobium, and optionally tellurium struggle to achieve high activity and selectivity.
Innovation Solution
A process involving a mixed metal oxide catalyst with molybdenum, vanadium, niobium, and optionally tellurium, where a gas stream of oxygen and the alkane or alkene is contacted at a weight hourly space velocity of 2.1 to 25.0 hr−1 and a temperature of 300 to 500° C., utilizing a heterogeneous, porous catalyst bed with inert particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional oxidative dehydrogenation processes are used with mixed metal oxide catalysts, then the process can proceed, but activity and selectivity are insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing the weight hourly space velocity to a specific range (2.1-25.0 hr−1) and temperature to (300-500° C.) to simultaneously improve catalyst activity and selectivity. This resolves the contradiction by finding the optimal operating window where both productivity and reliability are enhanced
Solution Approach 2:
The patent uses a mixed metal oxide catalyst containing multiple metals (molybdenum, vanadium, niobium, and optionally tellurium) in specific compositional ranges. This composite catalyst structure synergistically improves both activity and selectivity, resolving the technical contradiction between productivity and reliability
2Productivity
If higher conversion is achieved, then productivity increases, but selectivity decreases
Solution Approach 1:
The patent resolves this contradiction by implementing specific parameter ranges: weight hourly space velocity of 2.1-25.0 hr−1 and temperature of 300-500° C. These optimized parameters enable the system to achieve high conversion while maintaining high selectivity, breaking the traditional trade-off between productivity and reliability
3Reliability
If higher selectivity is achieved, then product quality improves, but conversion decreases
Solution Approach 1:
The patent applies parameter changes with WHSV of 2.1-25.0 hr−1 and temperature of 300-500° C. to simultaneously achieve high selectivity and high conversion. This optimized parameter window resolves the contradiction by enabling both high product quality and high productivity
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
This approach results in higher selectivities at the same conversion or higher conversions at the same selectivity, optimizing the alkane ODH and alkene oxidation processes.
Implementation Method 1
a gas stream comprising oxygen and the alkane and/or alkene is contacted with a mixed metal oxide catalyst containing molybdenum, vanadium, niobium and optionally tellurium
Implementation Method 2
utilizing a heterogeneous, porous catalyst bed with inert particles
Data Source
AI summary
The invention relates to a process of the oxidative dehydrogenation of an alkane containing 2 to 6 carbon atoms and/or the oxidation of an alkene containing 2 to 6 carbon atoms, wherein a gas stream comprising oxygen and the alkane and/or alkene is contacted with a mixed metal oxide catalyst containing molybdenum, vanadium, niobium and optionally tellurium, and wherein the weight hourly space velocity is of from 2.1 to 25.0 hr−1 and the temperature is of from 300 to 500° C.