Hydrocarbon Conversion Catalyst Hydrogen Trapping
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Solution Overview
Problem
Conventional methods for converting saturated paraffins to olefins, such as thermal cracking and catalytic cracking, face challenges in controlling product selectivity and are plagued by side reactions like hydrogenation and hydrogenolysis, which reduce the efficiency of olefin production.
Innovation Solution
A hydrocarbon conversion catalyst comprising a dehydrogenation active metal on a solid support and a transition metal with a doping agent on an inorganic support, specifically designed to minimize hydrogen-related side reactions by 'kicking away' hydrogen from active sites, thereby enhancing olefin selectivity and reducing methane production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dehydrogenation is used to convert saturated paraffins to olefins, then olefin production efficiency is improved, but hydrogen-related side reactions (hydrogenation and hydrogenolysis) increase
Solution Approach 1:
The patent extracts and removes hydrogen from the reaction environment by using a hydrogen-trapping component (zeolite with specific acidity) that selectively binds hydrogen atoms. This prevents hydrogen from participating in unwanted hydrogenation and hydrogenolysis side reactions, thereby maintaining high olefin production efficiency while eliminating the harmful effects of excess hydrogen
Solution Approach 2:
The patent introduces a mediator component (zeolite with controlled acidity) that interacts with hydrogen species generated during dehydrogenation. This mediator traps and stabilizes hydrogen in a form that cannot participate in harmful side reactions, allowing the dehydrogenation process to proceed efficiently without the negative consequences of free hydrogen
2Productivity
If conventional thermal cracking is used to convert paraffins to olefins, then olefin production is achieved, but energy consumption increases and product selectivity control becomes difficult
Solution Approach 1:
The patent changes the reaction parameters by using a catalyst system with specific metal components (Group 4-12 metals) and controlled acidity. This lowers the activation energy required for the reaction, enabling olefin production at milder temperatures and reducing energy consumption compared to thermal cracking, while the catalyst provides selective active sites that control product distribution
Solution Approach 2:
The patent employs a composite catalyst material combining metal components (for dehydrogenation activity) with zeolite support (for acidity control and hydrogen trapping). This composite structure provides both the energy efficiency of catalytic pathways and the selectivity control needed for optimized olefin production, overcoming the limitations of conventional thermal cracking
3Manufacturing precision
If dehydrogenation is used to convert paraffins to olefins, then olefin selectivity is improved, but hydrogen accumulation occurs leading to hydrogenolysis and cracking
Solution Approach 1:
The patent extracts accumulated hydrogen from the reaction environment using a hydrogen-trapping zeolite component. This prevents hydrogen buildup that would otherwise lead to hydrogenolysis and cracking reactions, maintaining high olefin selectivity throughout the reaction process by continuously removing harmful hydrogen species
Solution Approach 2:
The patent implements a feedback mechanism where the hydrogen-trapping component responds to hydrogen accumulation by selectively binding excess hydrogen. This feedback control prevents hydrogen concentration from reaching levels that would cause harmful side reactions, thereby maintaining stable olefin selectivity over time
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 significantly increases total olefin selectivity while decreasing methane production, allowing for efficient conversion of paraffins to olefins under milder conditions compared to traditional methods.
Implementation Method 1
converting saturated paraffins to olefins by dehydrogenation utilizing an appropriate catalyst
Implementation Method 2
a second composition comprising a transition metal and a doping agent on an inorganic support, wherein the doping agent is selected from zinc, gallium, indium, lanthanum, and mixtures thereof
Data Source
AI summary
The present invention relates to a hydrocarbon conversion catalyst, comprising: a first composition comprising a dehydrogenation active metal on a solid support, and a second composition comprising a transition metal and a doping agent, wherein the doping agent is selected from zinc, gallium, indium, lanthanum, and mixtures thereof, on an inorganic support.