Catalyst Oxides for Light Alkane Conversion
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Solution Overview
Problem
The oxidative dehydrogenation (ODH) of light alkanes, particularly methane and ethane, is challenging due to their chemical inertness and high C—H bond strength, leading to deep oxidation to COx, which limits the viability of catalytic systems.
Innovation Solution
A method involving a reactor system with a catalyst comprising oxides of molybdenum, vanadium, niobium, cerium, titanium, zirconium, and precious metals, such as the oxide of (Mo0.6Nb0.22V0.18)5O14, is used to convert light alkanes into oxygenates, with advanced product separation techniques to achieve high purity acetic acid production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional catalytic systems are used for oxidative dehydrogenation of light alkanes, then deep oxidation to COx occurs, but selective production of oxygenates is hindered due to chemical inertness and high C-H bond strength
Solution Approach 1:
The patent changes the chemical parameters of the catalytic system by incorporating specific metal oxides (molybdenum, vanadium, niobium, cerium, titanium, zirconium) and precious metals in controlled ratios. This modifies the catalyst's electronic and geometric properties to achieve selective C-H bond activation at milder conditions, preventing deep oxidation while maintaining reliability in oxygenate production
Solution Approach 2:
The patent employs composite catalytic materials combining multiple metal oxides and precious metals on support structures. This composite approach creates synergistic effects where different components work together to activate C-H bonds selectively while controlling oxidation pathways, thereby reducing harmful COx formation and improving oxygenate selectivity
2Temperature
If mild conditions are used for selective oxidation of light alkanes, then chemical inertness and high C-H bond strength prevent effective conversion, but harsh conditions lead to deep oxidation
Solution Approach 1:
The patent optimizes reaction parameters including temperature, pressure, and oxygen-to-alkane ratio to operate at mild conditions (lower temperatures and pressures). The modified catalytic system enables effective C-H bond activation under these milder parameters, achieving both selectivity and productivity without requiring harsh conditions that cause deep oxidation
Solution Approach 2:
The patent introduces the modified catalytic system as an intermediary that mediates between the light alkanes and oxygen. The catalyst provides alternative reaction pathways with lower activation energies, enabling selective oxidation at milder conditions while maintaining high conversion rates, thus bridging the gap between mild conditions and effective productivity
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 enables the selective production of oxygenates from light alkanes with high productivity and stability in a single-stage catalytic process, overcoming the limitations of deep oxidation and achieving efficient separation of acetic acid.
Implementation Method 1
The reactor system comprises at least one catalyst, the at least one catalyst comprises one or more oxides of molybdenum, vanadium, niobium, cerium, titanium, zirconium, and one or more precious metals
Implementation Method 2
The oxidative dehydrogenation (ODH) of light alkanes (C1 to C4) to make oxygenates
Data Source
AI summary
A method for converting one or more hydrocarbons includes feeding a fluid comprising one or more light alkanes to a reactor system, and producing one or more oxygenates from the one or more light alkanes in the reactor system. The reactor system comprises a reactor containing at least one catalyst, the at least one catalyst comprises one or more oxides of molybdenum, vanadium, niobium, cerium, titanium, zirconium, and one or more precious metals. An oxygenate productivity is higher than about 50 g/kg cat.h after 100 hours of time on stream.