Composite Catalyst for Methane Dehydro-aromatization
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Solution Overview
Problem
Current catalysts for dehydro-aromatization of methane suffer from low reaction activity and stability due to molybdenum carbide agglomeration and carbon deposition, limiting BTX yield and catalyst lifespan.
Innovation Solution
A composite catalyst is developed by physically mixing nickel oxide with a transition metal oxide-supported catalyst on a porous zeolite support, enhancing dispersion and activity through controlled Si/Al ratio and post-treatment processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a molybdenum oxide-supported catalyst is used for dehydro-aromatization of methane, then the catalyst can activate methane and produce BTX, but the molybdenum carbide formed during the reaction undergoes agglomeration, causing catalyst deactivation
Solution Approach 1:
Nickel oxide is introduced as an intermediary substance that mediates between methane and molybdenum oxide. The nickel oxide facilitates the carburization process and helps disperse molybdenum carbide during formation, preventing agglomeration while maintaining high BTX production rates
Solution Approach 2:
The invention creates a composite catalyst system combining nickel oxide and molybdenum oxide on a zeolite support. This composite structure leverages the synergistic effects of both metals, where nickel oxide prevents molybdenum carbide agglomeration while molybdenum oxide activates methane, thereby improving both productivity and reliability
2Productivity
If a supported catalyst is used to activate methane, then the dehydro-aromatization reaction can proceed, but carbon deposition occurs, leading to catalyst deactivation
Solution Approach 1:
The invention converts the potentially harmful carbon deposition into a beneficial process by controlling it to form molybdenum carbide and nickel carbide in situ. These carbides serve as active catalytic species for methane activation and dehydro-aromatization, transforming what would be a deactivating factor into a productivity-enhancing mechanism
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 composite catalyst exhibits higher catalytic activity and stability, significantly increasing BTX yield and reducing deactivation rates compared to traditional catalysts, while maintaining pore structure and preventing carbon deposition.
Implementation Method 1
a nickel oxide (NiO) physically dispersed in the supported catalyst
Implementation Method 2
the molybdenum oxide present in the molybdenum/zeolite catalyst undergoes carburization and is converted into molybdenum carbide
Implementation Method 3
a porous support and a catalyst of a transition metal oxide supported in the support
Implementation Method 4
the formed intermediate undergoes cyclization, thereby producing BTX
Data Source
AI summary
Provided is a composite catalyst used in a dehydro-aromatization reaction of methane, the composite catalyst including a glasslike metal oxide catalyst which includes a supported catalyst including a porous support and a catalyst of a transition metal oxide supported on the support, and a nickel oxide (NiO) physically dispersed in the supported catalyst.