Alkane to Alkene Conversion via Perovskite Catalysts
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Solution Overview
Problem
Current methods for converting alkanes to alkenes, such as thermal cracking and catalytic dehydrogenation, face issues like rapid catalyst deactivation, high energy consumption, and thermodynamic limitations, while oxidative dehydrogenation (ODH) processes require efficient and cost-effective catalysts to achieve high yields and reduce greenhouse gas emissions.
Innovation Solution
A process utilizing recyclable mixed oxide and perovskite catalysts, specifically Co oxide on titania or ABO3 type perovskite SrxCayTiaMnbO3, is used to contact a feed stream of alkanes and oxidants at temperatures between 350 to 700°C, optimizing the alkane to oxidant ratio and reaction conditions in fixed bed or fluidized bed reactors to achieve high alkene yields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermal cracking or catalytic dehydrogenation is used to convert alkanes to alkenes, then alkene production is achieved, but rapid catalyst deactivation occurs
Solution Approach 1:
The patent uses composite catalyst systems combining metal oxides (Co3O4, MnO2, CuO, NiO) with support materials (alumina, silica, titania, zirconia). These composite structures provide both high catalytic activity for alkene production and enhanced stability to resist deactivation. The synergistic interaction between different oxide components and support materials improves catalyst longevity while maintaining productivity.
Solution Approach 2:
The patent optimizes multiple parameters including reaction temperature (300-700°C), pressure (1-10 atm), alkane-to-oxidant ratio (1:1 to 1:5), and contact time to maximize alkene yield while minimizing catalyst deactivation. By carefully controlling these parameters, the process achieves high productivity with improved catalyst stability under oxidative dehydrogenation conditions.
2Productivity
If conventional dehydrogenation processes are used, then alkenes are produced, but high energy consumption occurs
Solution Approach 1:
The patent employs oxidative dehydrogenation using oxygen or air as oxidant instead of conventional thermal or catalytic dehydrogenation. The oxidation reaction is exothermic, releasing heat that drives the dehydrogenation process and reduces external energy input requirements. This approach maintains high alkene production while significantly lowering energy consumption compared to endothermic conventional methods.
Solution Approach 2:
The patent converts the typically harmful over-oxidation side reactions into beneficial effects by using controlled oxidation to drive dehydrogenation. The exothermic oxidation provides the necessary heat for the endothermic dehydrogenation step, creating a self-sustaining process that reduces external energy requirements while maintaining high alkene yields.
3Use of energy by moving object
If oxidative dehydrogenation is used to convert alkanes to alkenes, then energy efficiency is improved, but greenhouse gas emissions occur
Solution Approach 1:
The patent optimizes reaction parameters including temperature (300-700°C), pressure (1-10 atm), and alkane-to-oxidant ratio (1:1 to 1:5) to maximize alkene selectivity and minimize CO2 formation. By operating under carefully controlled conditions with optimized catalyst systems, the process achieves high energy efficiency while reducing over-oxidation side reactions that produce greenhouse gases.
Solution Approach 2:
The patent uses spatially distributed catalyst components with different functions - some sites promote dehydrogenation while others facilitate selective oxidation. This local differentiation of catalytic activity within the composite catalyst structure allows the process to achieve high energy efficiency through exothermic oxidation while minimizing greenhouse gas emissions by directing reactions toward desired alkene products rather than complete combustion.
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 high yields of alkenes, ranging from 8 to 35 mol%, with improved energy efficiency, reduced costs, and lower greenhouse gas emissions, making the process more economically and environmentally friendly.
Implementation Method 1
Oxidative dehydrogenation (ODH) of light alkanes is a commercially attractive route to produce alkenes. The main advantage is the exothermic nature of the reaction which avoids the thermodynamic constraints of other non-oxidative routes by forming water as a byproduct.
Implementation Method 2
contacting a feed stream comprising the alkane and an oxidant with a catalyst at a temperature of 350 to 700° C. to produce corresponding alkene; wherein said catalyst is selected from Co oxide on titania or ABO3 type perovskite
Implementation Method 3
The main advantage is the exothermic nature of the reaction which avoids the thermodynamic constraints of other non-oxidative routes by forming water as a byproduct.
Data Source
AI summary
The present invention discloses an improved process for the conversion of alkanes to alkenes in the presence of a recyclable mixed oxide and perovskite catalysts with high yield.