Mo-V-Te-Nb-Pd Catalyst for Ethane ODH
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Solution Overview
Problem
Current oxidative dehydrogenation (ODH) processes for converting paraffins to olefins are energy-intensive and costly, with thermal cracking methods producing significant CO2 and requiring extensive safety precautions, while existing catalysts face challenges in selectivity and stability, leading to unwanted byproducts.
Innovation Solution
A mixed metal oxide catalyst of the formula Mo—V—Nb—Te—Pd—O is developed, where palladium is added after a calcination step, enhancing activity without compromising selectivity, and allowing for undiluted ODH processes without the need for inert gas dilution, thereby reducing downstream processing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermal cracking is used to convert paraffins to olefins, then conversion can be achieved, but energy consumption increases and CO2 production increases
Solution Approach 1:
The patent changes the fundamental parameters of the reaction by introducing oxygen as a reactant, transforming the process from purely thermal cracking to oxidative dehydrogenation. This allows conversion at lower temperatures (300-750°C) compared to thermal cracking (1000°C), significantly reducing energy consumption while maintaining productivity
Solution Approach 2:
The patent introduces an oxidative dehydrogenation catalyst as an intermediary substance that facilitates the conversion of paraffins to olefins through oxidation. The catalyst mediates the reaction between paraffins and oxygen, enabling the transformation to proceed at lower temperatures with reduced energy input
2Use of energy by moving object
If oxidative dehydrogenation is used to convert paraffins to olefins, then energy consumption decreases, but safety risks increase due to thermal runaway
Solution Approach 1:
The patent employs a catalyst system with controlled oxidation activity that provides feedback control over the reaction rate. The catalyst promotes oxidation at moderate rates, preventing runaway reactions while maintaining efficient conversion. The selective oxidation mechanism inherently regulates heat generation, reducing thermal runaway risks
Solution Approach 2:
The patent changes the reaction temperature parameter to an optimal range (300-750°C) where oxidation occurs efficiently but thermal runaway is prevented. This temperature control, combined with the catalyst's selective oxidation activity, reduces energy consumption while managing safety risks
3Productivity
If existing ODH catalysts are used, then conversion can be achieved, but selectivity decreases leading to unwanted byproducts
Solution Approach 1:
The patent uses a composite catalyst system comprising multiple metal oxides (molybdenum, vanadium, niobium, tellurium) with complementary properties. This composite structure provides both high conversion activity and high selectivity for ethylene production, minimizing unwanted byproducts through synergistic effects of the different metal oxides
Solution Approach 2:
The patent creates local quality differences in the catalyst structure through the specific combination and distribution of metal oxides. Different regions of the catalyst have optimized properties for either conversion or selectivity, with the overall structure achieving both high conversion and high selectivity simultaneously
4Object-affected harmful factors
If inert gas dilution is used in ODH processes, then safety is improved, but downstream processing costs increase
Solution Approach 1:
The patent changes the process parameters by eliminating the need for inert gas dilution through optimized catalyst performance. The catalyst achieves safe operating conditions and high conversion without requiring dilution, thereby eliminating downstream processing costs associated with removing inert gases while maintaining safety
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 demonstrates increased activity and selectivity for ethylene production with reduced energy consumption and safety risks, eliminating the need for inert gas dilution, thus offering a more efficient and cost-effective ODH process.
Implementation Method 1
catalyst for oxidative dehydrogenation (ODH) of ethane
Implementation Method 2
incorporation of palladium into the catalyst, using a palladium compound that is free from halogens, is performed after a calcination step
Implementation Method 3
conversion of paraffins can be accomplished using an oxidative dehydrogenation (ODH) process where a stream of one or more alkanes are passed over an oxidative dehydrogenation catalyst, in the presence of oxygen or an oxygen containing gas
Data Source
AI summary
A catalyst for oxidative dehydrogenation (ODH) of ethane with an empirical formula Mo—V—Te—Nb—Pd—O produced using a process comprising impregnation of the Pd component on the surface of the catalyst following a calcination step using a Pd compound free of halogens. The resulting catalyst can be used in both diluted and undiluted ODH processes and shows higher than expected activity without any loss of selectivity.