Tunable Catalyst Material for Ethylene Selectivity
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Solution Overview
Problem
Selective oxidation processes like oxidative dehydrogenation (ODH) face challenges with lower conversion rates and selectivity compared to steam cracking, and the risk of deflagration due to mixing hydrocarbons with oxygen, limiting their commercial implementation. Additionally, catalysts for higher temperatures often have lower selectivity to ethylene, making energy recovery inefficient.
Innovation Solution
A catalyst material comprising molybdenum, vanadium, tellurium, niobium, and beryllium with specific molar ratios, which can be tuned by varying the beryllium content to achieve higher activity and selectivity to ethylene, allowing operation at higher temperatures while maintaining efficient energy recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If catalysts are operated at higher temperatures above 400°C to improve energy recovery efficiency, then energy recovery efficiency is improved, but selectivity to ethylene decreases
Solution Approach 1:
The patent changes the chemical composition parameters of the catalyst by incorporating beryllium oxide along with molybdenum, vanadium, tellurium, and niobium in specific ratios. This compositional parameter change enables the catalyst to maintain high ethylene selectivity (above 90%) at elevated operating temperatures (400-500°C), thereby resolving the trade-off between energy recovery efficiency and selectivity
Solution Approach 2:
The patent employs a composite catalyst material consisting of multiple metal oxides (molybdenum oxide, vanadium oxide, tellurium oxide, niobium oxide, and beryllium oxide) combined in specific proportions. This composite structure synergistically enhances both the thermal stability and selectivity properties, allowing the catalyst to operate effectively at higher temperatures without sacrificing ethylene selectivity
2Manufacturing precision
If catalysts are operated at lower temperatures below 400°C to maintain high selectivity to ethylene, then selectivity to ethylene is improved, but energy recovery efficiency decreases
Solution Approach 1:
By modifying the catalyst's chemical composition to include beryllium oxide and optimizing the ratios of metal components, the patent shifts the catalyst's operational characteristics. This enables the catalyst to achieve both high selectivity (90-100% to ethylene) and high energy recovery efficiency simultaneously by operating in the 400-500°C temperature range, rather than requiring a trade-off
3Productivity
If beryllium content is increased to tune catalyst activity, then catalyst activity is improved, but cost increases
Solution Approach 1:
The patent systematically varies the beryllium oxide content within an optimized range (0.01-0.50 mole ratio relative to molybdenum) to achieve the desired catalyst activity level. By precisely controlling this compositional parameter along with other metal ratios, the patent optimizes the balance between catalyst performance and material cost, avoiding both insufficient activity and excessive cost
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 material achieves high selectivity to ethylene (90-100%) and tunable activity, enabling efficient oxidative dehydrogenation of ethane at higher temperatures without compromising selectivity, thus facilitating commercialization of ODH processes.
Implementation Method 1
a catalyst material comprising molybdenum, vanadium, tellurium, niobium, and beryllium with specific molar ratios, which can be tuned by varying the beryllium content to achieve higher activity and selectivity to ethylene
Data Source
AI summary
A catalyst material includes molybdenum (Mo): vanadium (V). the molar ratio of Mo:V being between 1:0.12 and 1:0.49; tellurium (Te), the molar ratio of Mo:Te being between 1:0.01 and 1:0.30; niobium (Nb), the molar ratio of Mo:Nb being between 1:0.01 and 1:0.30; and beryllium (Be), the molar ratio of Mo:Be being from 1:1 to 1:50.