VOx-B2O3 Alumina Catalyst for Selective Propane ODH to Propylene
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Solution Overview
Problem
Existing catalysts for the oxidative dehydrogenation of propane face challenges in achieving an optimal balance between activity and selectivity, with boron-based catalysts limiting cracking and overoxidation, and vanadium-based catalysts being electron-deficient or electron-rich, leading to inefficiencies in propylene production.
Innovation Solution
A catalyst composition is developed by embedding vanadium oxide (VOx) and boron oxide (B2O3) particles onto an alumina support through a two-phase calcination process, creating a layered mesoporous structure with tuned active site diversity, enhancing propane conversion to propylene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If highly active lattice oxygens are used in vanadium-based catalysts, then catalytic activity is improved, but selectivity to olefins deteriorates due to electron-deficient nature
Solution Approach 1:
The patent combines vanadium oxide (VOx) and boron oxide (B2O3) to create a composite catalyst system. The VOx component provides high catalytic activity through its electron-deficient lattice oxygens, while the B2O3 component compensates for low selectivity by stabilizing intermediate species and suppressing overoxidation reactions. This composite approach allows simultaneous achievement of high activity and selectivity that neither component can achieve alone.
2Manufacturing precision
If electron-rich (nucleophilic) lattice oxygens are used in vanadium-based catalysts, then selectivity to olefins is improved, but catalytic activity deteriorates
Solution Approach 1:
The composite VOx-B2O3 system allows the electron-rich B2O3 component to enhance selectivity while the electron-deficient VOx component maintains high catalytic activity. The synergistic interaction between the two materials enables the catalyst to achieve both high olefin selectivity and high propane conversion rates.
3Manufacturing precision
If boron-based catalysts are used to limit cracking and overoxidation, then selectivity is improved, but catalytic activity is limited
Solution Approach 1:
By combining B2O3 (which provides high selectivity through its ability to stabilize intermediates and suppress cracking) with VOx (which provides high catalytic activity), the composite catalyst achieves both high selectivity and high activity. The VOx component compensates for the limited activity of pure boron-based catalysts.
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 achieves up to 80% propane conversion and 50% propylene yield, with a balanced selectivity and stability, leveraging the advantages of both vanadium and boron-based catalysts while overcoming their individual limitations.
Implementation Method 1
CO2-mediated oxidative dehydrogenation of propane
Implementation Method 2
catalyst composition containing vanadium oxide (VOx) and boron oxide (B2O3) particles embedded onto an alumina support
Implementation Method 3
calcining the first mixture after the drying at a first temperature of at least 200° C. and a second temperature of at least 550° C. thereby allowing the first catalyst precursor particles embedded onto the surfaces of the alumina support to decompose in situ
Data Source
AI summary
A method of making an active catalyst composition includes mixing an alumina support with first catalyst precursor particles and grinding thereby at least partially embedding the first catalyst precursor particles onto surfaces of the alumina support to form a first composite precursor; mixing the first composite precursor and a first solvent to form a first mixture; grinding the first mixture and drying at a temperature of 100 to 150° C.; calcining the first mixture after the drying at a first temperature of at least 200° C. and a second temperature of at least 550° C. thereby allowing the first catalyst precursor particles embedded onto the surfaces of the alumina support to decompose in situ to generate first catalyst particles embedded onto the surfaces of the alumina support and form a first catalyst; and mixing the first catalyst with a second catalyst to form the active catalyst composition.