Zeolite Catalyst Structure Preventing Metal Aggregation
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Solution Overview
Problem
Catalysts used in hydrocarbon production, such as those in Fischer-Tropsch synthesis, face issues with metal fine particle aggregation leading to decreased catalytic activity and shorter catalyst life due to hot spots and oxidation, which complicates resource management and efficiency.
Innovation Solution
A catalyst structure featuring a porous zeolite-type support with channels communicating with each other, where metal elements like cobalt, nickel, and iron are dispersed within the channels, preventing aggregation and maintaining catalytic activity by incorporating additional metal elements like platinum and ruthenium, and using a hydrothermal treatment method to ensure effective distribution and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If metal fine particles are highly dispersed on the support surface, then catalytic activity is improved, but metal particles aggregate during reaction leading to decreased activity and shorter catalyst life
Solution Approach 1:
The patent utilizes a porous support material with controlled pore size to disperse metal fine particles throughout the three-dimensional pore structure rather than just on the surface. This provides extensive dispersion space while the porous network physically separates particles, preventing aggregation during reaction and maintaining both high catalytic activity and long catalyst life.
Solution Approach 2:
The patent embeds metal fine particles within the pore structure of the support, creating a nested configuration where particles are contained within the three-dimensional network of the porous material. This nesting approach prevents particle aggregation while maintaining high dispersion, resolving the contradiction between activity and stability.
2Reliability
If sol-gel method is used to incorporate active metal species in support lattices, then metal particle aggregation is prevented, but catalytic activity becomes insufficient due to strong bonding
Solution Approach 1:
The patent applies different treatment to different regions: metal particles dispersed in the pore spaces maintain their metallic state and high catalytic activity, while the support lattice provides structural stability. This local differentiation allows particles to remain active rather than being overly stabilized in the lattice like the sol-gel method.
Solution Approach 2:
The porous support acts as an intermediary between the metal particles and the reaction environment, providing physical separation and stability without forming strong chemical bonds that would reduce catalytic activity, unlike the sol-gel approach where metals are incorporated into the lattice structure.
3Productivity
If catalyst replacement is performed frequently to maintain activity, then catalytic efficiency is maintained, but operational complexity increases and resource waste occurs
Solution Approach 1:
The patent enables continuous maintenance of catalytic activity over extended periods by preventing particle aggregation through the porous support structure. This continuity eliminates the need for frequent interruptions for catalyst replacement, reducing operational complexity and resource waste while maintaining high efficiency.
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 structure effectively prevents metal fine particle aggregation, maintains high catalytic activity over a longer period, reducing the need for frequent replacements and enhancing resource efficiency in hydrocarbon production processes.
Implementation Method 1
a support that has a porous structure and includes a zeolite-type compound... the functional material including the first element is present at least in the channels of the support
Implementation Method 2
using a hydrothermal treatment method to ensure effective distribution and stability
Implementation Method 3
H2O produced during the FT synthesis reaction may oxidize the active metal in the catalyst to reduce the catalytic activity
Data Source
AI summary
A catalyst structure that allows prevention of aggregation of fine particles of a functional material, suppresses decrease of catalyst activity, and thus enables the extension of the lifetime of the catalyst structure. A catalyst structure is provided with: a support that is formed from a zeolite-type compound and has a porous structure; and at least one functional material present in the support. The functional material includes a first element that is at least one metallic element selected from the group consisting of cobalt, nickel, and iron. The support has paths connected to each other. The functional material including the first element is present in at least the paths of the support.