Multi-Metal Oxide Catalyst for Ethane Dehydrogenation
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Solution Overview
Problem
Current catalysts for the oxidative dehydrogenation of ethane to ethylene face inefficiencies in conversion and selectivity, particularly at varying temperatures and pressures, requiring optimization for specific conditions and catalyst compositions.
Innovation Solution
A catalyst composition of Mo0-1W0.3-1V0.2-0.4Te0.06-0.10Fe0.0-0.10Nb0.08-0.18OX, where X is determined by the valance of the metal oxides, is developed, supported on oxides like titanium or zirconia, and prepared through a hydrothermal process with specific pH adjustments and calcination steps, enhancing conversion and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional catalysts are used for oxidative dehydrogenation of ethane, then the process can proceed, but conversion rates and selectivity are insufficient particularly at varying temperatures and pressures
Solution Approach 1:
The patent employs a composite catalyst system comprising multiple metal oxides (Mo, W, V, Te, Fe, Nb) in specific compositional ratios. This composite material approach allows synergistic interactions between different oxide components, where each metal oxide contributes specific catalytic properties that collectively enhance both conversion rate and selectivity across varying operating conditions.
Solution Approach 2:
The patent systematically optimizes multiple parameters including the compositional ratios of metal oxides, calcination temperature, and hydrothermal treatment conditions. By adjusting these parameters, the catalyst achieves maximum activity and selectivity, resolving the contradiction between conversion rate and selectivity through precise parameter control.
2Productivity
If catalyst composition is optimized for specific conditions, then conversion and selectivity improve, but the catalyst becomes less adaptable to varying temperatures and pressures
Solution Approach 1:
The multi-component oxide catalyst system is designed to perform multiple functions simultaneously: Mo and W oxides provide dehydrogenation activity, V oxide enhances oxygen activation, Te oxide improves selectivity, Fe oxide contributes to redox cycling, and Nb oxide stabilizes the structure. This multi-functionality enables the single catalyst to maintain high performance across a broad range of temperatures and pressures.
Solution Approach 2:
Different metal oxide components are distributed throughout the catalyst structure with specific local functions. The spatial distribution and interaction of these oxides create localized active sites with different characteristics, allowing the catalyst to handle varying reaction conditions through distributed functionality rather than uniform behavior.
3Productivity
If a complex multi-metal oxide catalyst is used, then conversion and selectivity improve, but the manufacturing complexity increases
Solution Approach 1:
The patent employs preliminary hydrothermal treatment of the catalyst precursor before final calcination. This pre-treatment step pre-organizes the metal oxide components and creates a more uniform distribution of active sites, simplifying the subsequent calcination process and reducing the need for multiple sequential manufacturing steps despite the complex composition.
Solution Approach 2:
The patent combines multiple metal oxide synthesis steps into a single hydrothermal treatment followed by one calcination cycle. Rather than separately preparing and combining individual oxide powders, all metal precursors are mixed and treated together, merging multiple manufacturing operations into fewer steps despite the complex final composition.
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 conversion rates from 65% to 90% for ethane to ethylene at temperatures from 300° C. to 450° C., with selectivity ranging from 65% to 85%, improving the efficiency and stability of the oxidative dehydrogenation process.
Implementation Method 1
contacting a mixture of ethane and oxygen in an ODH reactor with an ODH catalyst under conditions that promote oxidation of ethane into ethylene
Implementation Method 2
The catalyst is prepared by a hydrothermal process at a pressure from 10 psi to 190 psi (960 kPa to 1300 kPa)
Implementation Method 3
the catalyst has been treated with the equivalent of from 0.3 mL to 2.8 mL, in some embodiments from 0.3 mL to 2.5 mL of a 30 wt. % solution of aqueous H2O2 per gram of catalyst precursor prior to or subsequent to calcination
Data Source
AI summary
The oxidative dehydrogenation of ethane comprises contacting a mixture of ethane and oxygen in an ODH reactor with an ODH catalyst under conditions that promote oxidation of ethane into ethylene. Conditions within the reactor are controlled by the operator and include, but are not limited to, parameters such as 5 temperature, pressure, and flow rate. Conditions will vary and can be optimized for a specific catalyst, or whether an inert diluent is used in the mixing of the reactants. Disclosed herein is a catalyst consisting of: Mo0-1W0.3-1V0.2-0.4Te0.06-0.10Fe0.0-0.10Nb0.08-0.18OX where X is determined by the valance of the metals.