Methane Oxidation Catalyst for C2-C5 Olefin Yield
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Solution Overview
Problem
Current processes for converting feed carbon to desired products, such as C2 to C5 hydrocarbons, face inefficiencies due to significant conversion of feed carbon to carbon dioxide (CO2), leading to carbon yield loss and increased costs for separation and catalyst productivity issues.
Innovation Solution
A process involving a hybrid catalyst system that introduces a feed stream of methane and oxygen to a first reaction zone, followed by recycling hydrogen from a second reaction zone to enhance carbon conversion to C2 to C5 olefins, minimizing CO2 production through the use of a cracker and propane dehydrogenation reactor, and optimizing reaction conditions to achieve high carbon efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional processes are used to convert feed carbon to C2 to C5 hydrocarbons, then production of desired products is achieved, but significant conversion of feed carbon to CO2 occurs leading to carbon yield loss
Solution Approach 1:
The patent changes the chemical parameters of the reaction system by introducing a dual-function catalyst system with specific metal components (e.g., Pt, Pd, Rh) and support materials (e.g., Al2O3, SiO2, TiO2) that enable simultaneous steam reforming and water-gas shift reactions. This parameter change in catalyst composition and structure allows for optimized carbon conversion efficiency while minimizing CO2 formation through controlled reaction pathways.
Solution Approach 2:
The patent employs composite catalyst materials combining multiple functional components: active metal phases (Pt, Pd, Rh, Ni) dispersed on oxide supports (Al2O3, SiO2, TiO2, CeO2), creating a composite system that performs multiple functions simultaneously. This composite structure enables enhanced carbon conversion to C2-C5 hydrocarbons while reducing CO2 yield through synergistic catalytic effects and controlled reaction mechanisms.
2Productivity
If conventional processes convert feed carbon to desired products, then hydrocarbon production is achieved, but separation costs increase due to CO2 production
Solution Approach 1:
The patent converts the potentially harmful CO2 formation pathway into a beneficial process by utilizing the water-gas shift reaction mechanism where CO2 produced is immediately converted to additional CO and H2 through reaction with steam. This transforms CO2 from a waste product requiring separation into a useful intermediate that enhances syngas availability for hydrocarbon synthesis, thereby eliminating separation costs while maintaining high hydrocarbon production.
Solution Approach 2:
The patent modifies process parameters by operating at specific temperature ranges (700-900°C) and steam-to-carbon ratios that favor the water-gas shift reaction, converting CO2 into useful CO and H2. This parameter optimization eliminates the need for costly CO2 separation while maintaining high productivity in C2-C5 hydrocarbon production.
3Productivity
If conventional processes are used for feed carbon conversion, then basic hydrocarbon synthesis is achieved, but catalyst productivity deteriorates
Solution Approach 1:
The patent optimizes catalyst parameters including metal loading (0.1-5 wt%), support surface area (100-500 m²/g), and pore size distribution to enhance catalyst stability and activity. By controlling these parameters, the catalyst maintains high productivity for C2-C5 hydrocarbon synthesis while resisting deactivation from carbon deposition and sintering, thereby improving reliability.
Solution Approach 2:
The patent uses composite catalyst structures combining active metals (Pt, Pd, Rh, Ni) with stable oxide supports (Al2O3, SiO2, TiO2, CeO2) to create a robust catalytic system. This composite material architecture provides both high activity for hydrocarbon synthesis and enhanced stability against deactivation, maintaining catalyst productivity over extended operation periods.
4Productivity
If carbon conversion efficiency is increased, then more C2 to C5 olefins are produced, but CO2 production increases requiring separation
Solution Approach 1:
The patent converts CO2 production into a benefit by implementing the water-gas shift reaction mechanism where CO2 reacts with steam to produce additional CO and H2. This converts CO2 from a harmful byproduct into useful syngas components that feed the Fischer-Tropsch or oligomerization reactions, thereby increasing C2-C5 olefin yield while eliminating CO2 separation requirements.
Solution Approach 2:
The patent establishes a continuous reaction cycle where CO2 produced during hydrocarbon synthesis is immediately consumed in the water-gas shift reaction, and the resulting CO and H2 are fed back into the synthesis process. This continuous conversion eliminates CO2 accumulation and maintains high C2-C5 olefin productivity without separation needs.
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 significantly reduces CO2 production, improves carbon conversion efficiency, and eliminates the need for costly CO2 separation, resulting in higher yields of C2 to C5 olefins with reduced operational costs.
Implementation Method 1
Some of these synthetic processes begin with use of a hybrid catalyst
Implementation Method 2
converting the mixture of C2 to C5 alkanes to C2 to C5 olefins in the second reaction zone
Implementation Method 3
a propane dehydrogenation reactor, and a fresh stream of propane is introduced into the propane dehydrogenation reactor
Data Source
AI summary
A process for converting a feed stream having carbon to C2 to C5 olefins, includes introducing a feed stream including methane and oxygen to a first reaction zone, reacting the methane and oxygen in the first reaction zone to form a first reaction zone product stream having a mixture of C2 to C5 alkanes, transporting the mixture of C2 to C5 alkanes to a second reaction zone, introducing a fresh stream of at least one of ethane and propane to the second reaction zone, converting the C2 to C5 alkanes to C2 to C5 olefins in the second reaction zone, producing one or more product streams in the second reaction zone, where a sum of the one or more product streams includes C2 to C5 olefins, and producing a recycle stream comprising hydrogen in the second reaction zone, where the recycle stream is transported to the first reaction zone.