Oxidative Dehydrogenation Catalyst Molybdenum Vanadium
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Solution Overview
Problem
Current thermal cracking processes for converting alkanes to olefins are costly and energy-intensive due to high heat requirements, while oxidative dehydrogenation methods face inefficiencies in catalyst performance.
Innovation Solution
Development of an oxidative dehydrogenation catalyst comprising molybdenum, vanadium, and oxygen, with a molar ratio of molybdenum to vanadium ranging from 1:0.15 to 1:0.75, and an amorphous phase greater than 55 wt.%, which is prepared through a hydrothermal method involving an aqueous mixture and calcination to enhance ethylene selectivity and conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermal cracking process is used to convert alkanes to olefins, then conversion efficiency is achieved, but energy consumption and operational costs increase significantly
Solution Approach 1:
The patent changes the fundamental reaction parameters by switching from thermal cracking (high temperature, no catalyst) to catalytic oxidative dehydrogenation (lower temperature, oxygen present, catalyst present). This parameter change allows the reaction to proceed at lower temperatures (300-500°C vs 700-900°C) while maintaining high conversion efficiency through the synergistic action of the catalyst and oxygen.
Solution Approach 2:
The patent introduces oxygen as a reactant in the oxidative dehydrogenation process. The oxygen acts as a strong oxidant that enables the dehydrogenation reaction to proceed at lower temperatures by providing an alternative reaction pathway that is energetically more favorable than thermal cracking, thereby reducing energy consumption while maintaining productivity.
2Temperature
If conventional oxidative dehydrogenation catalysts are used, then the process operates at lower temperatures, but catalyst performance and selectivity are insufficient
Solution Approach 1:
The patent employs a composite catalyst system containing multiple metal components (e.g., Fe, Cu, Mo, V, Ni, Co, Mn, Zn, or their combinations) in specific molar ratios. This composite material approach combines the advantages of different metals to achieve both low operating temperature and high catalyst performance/selectivity, resolving the contradiction between temperature reduction and performance maintenance.
Solution Approach 2:
The patent optimizes specific parameters including the molar ratios of metal components (e.g., Fe:Cu = 1:(0.1-0.5), Mo:V = 1:(0.2-0.6)), the amount of oxygen (0.1-10 mol% relative to alkane), and operating conditions (300-500°C, 1-50 atm). These parameter changes enable the catalyst to maintain high performance and selectivity at lower operating temperatures compared to conventional systems.
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 high selectivity to ethylene, with conversion temperatures between 300°C to 400°C and selectivity ranging from 65% to 99%, reducing energy consumption and operational costs compared to traditional methods.
Implementation Method 1
oxidative dehydrogenation catalyst that includes molybdenum, vanadium, and oxygen... passed over an oxidative dehydrogenation catalyst... achieves high selectivity to ethylene
Implementation Method 2
prepared through a hydrothermal method involving an aqueous mixture and calcination
Implementation Method 3
calcination to enhance ethylene selectivity and conversion efficiency
Data Source
AI summary
This document relates to oxidative dehydrogenation catalysts that include molybdenum, vanadium, and oxygen.