Mo-V-Nb-Te Catalyst for Ethane Dehydrogenation
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Solution Overview
Problem
Conventional oxidative dehydrogenation processes for converting alkanes to olefins require a co-feed stream of oxygen, leading to increased costs and safety concerns due to combustion risks, and exhibit limited stability in cyclic redox modes, especially with volatile tellurium-based catalysts.
Innovation Solution
A catalyst composition comprising oxides of molybdenum, vanadium, niobium, and bismuth with a Pba2-32 crystal structure, formed through hydrothermal synthesis, which allows for stable redox cycling and eliminates the need for oxygen co-feed, using air for reoxidation and maintaining stability without additional heat input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional oxidative dehydrogenation processes use oxygen co-feed, then ethane conversion is achieved, but combustion risks increase and safety concerns arise
Solution Approach 1:
The patent extracts and eliminates oxygen from the feed stream, using instead a catalyst system that performs dehydrogenation without requiring oxygen co-feed. The Mo-V-Nb-Te catalyst enables direct dehydrogenation of ethane to ethylene, removing the harmful combustion risk associated with oxygen while maintaining high conversion efficiency
Solution Approach 2:
The process operates in an inert atmosphere without oxygen, using nitrogen or other inert gases as the reaction medium. This eliminates combustion risks while the catalyst provides the necessary dehydrogenation function, creating a safe operating environment that maintains productivity
2Productivity
If conventional catalysts use tellurium promoter, then catalytic activity is achieved, but catalyst stability deteriorates due to volatility
Solution Approach 1:
The patent employs a composite catalyst system containing Mo, V, Nb, and Te in specific ratios, where the multiple components work synergistically. The Mo-V-Nb-Te composite structure provides both the necessary catalytic activity and improved stability, with each component contributing to overall performance and reducing the volatility issues of tellurium
Solution Approach 2:
The patent optimizes the compositional parameters of the catalyst, specifically the ratios of Mo:V:Nb:Te and the presence of promoters like Ca or Ba. By adjusting these parameters within specific ranges, the catalyst achieves optimal balance between activity and stability, reducing tellurium volatility while maintaining high catalytic performance
3Productivity
If oxidative dehydrogenation process is used, then dehydrogenation reaction proceeds, but additional heat input is required
Solution Approach 1:
The catalyst system is designed to be self-sustaining, where the dehydrogenation reaction itself provides the necessary heat through the reaction enthalpy. The process utilizes the heat generated during ethane conversion to maintain reaction temperature, eliminating the need for external heat input and improving energy efficiency while maintaining high dehydrogenation rates
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 high ethane conversion and ethylene selectivity, providing stable performance under cyclic redox conditions and reducing reactor contamination, thus improving material stability and process efficiency.
Implementation Method 1
conventional catalysts for converting alkanes to olefins, such as converting ethane to ethylene and acetic acid
Implementation Method 2
catalysts for the dehydrogenation of alkanes to olefins, such as catalysts for converting ethane to ethylene
Implementation Method 3
synthesizing MovVwNbyBizOx by hydrothermal synthesis at a hydrothermal synthesis temperature for a period of time
Data Source
AI summary
An oxidative dehydrogenation catalyst having: a structure having a formula MovVwNbyBizOx, where v is 1, w is from 0.1 to 0.5, y is from 0.001 to 0.3, z is from 0.01 to 0.3, and x is the oxygen content required to charge-balance the structure. The oxidative dehydrogenation catalyst has a Pba2-32 space group, characterized by reflections determined with Cu—Kα X-ray diffraction (XRD) as follows.