Disiloxane Metal Complex Fixation on Inorganic Oxide Carriers
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Solution Overview
Problem
Conventional methods for fixing metal complexes on inorganic oxide carriers often result in structural changes, leading to reduced catalytic activity and uneven dispersion of metal particles, making it difficult to maintain the skeletal structure and achieve high catalytic activity in supported metal catalysts.
Innovation Solution
A metal complex with a disiloxane group coordinated as a chelate to a central metal is used, allowing for fixation on an inorganic oxide while retaining the skeletal structure, and subsequent calcination enhances catalytic activity by achieving even dispersion of fine metal particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a metal complex is fixed on an inorganic oxide carrier using conventional methods, then the catalyst can be separated easily, but the skeletal structure of the metal complex changes and catalytic activity is reduced
Solution Approach 1:
The patent uses a silane coupling agent as an intermediary substance between the inorganic oxide carrier and the metal complex. The silane coupling agent contains both inorganic oxide-binding groups and organic functional groups that can coordinate with metal complexes, serving as a bridge that maintains the metal complex structure while enabling carrier attachment
Solution Approach 2:
The patent modifies the surface properties of the inorganic oxide carrier by introducing silane coupling agents, changing the surface chemistry parameters to enable better compatibility with metal complexes. This parameter change allows the carrier to bind metal complexes without causing structural changes
2Ease of manufacture
If metal salts are used to prepare supported metal catalysts, then the production process is simple, but the metal forms large particles with poor dispersion
Solution Approach 1:
The patent performs preliminary action by pre-modifying the carrier surface with silane coupling agents before introducing the metal complex. This preliminary modification creates optimal binding sites that ensure uniform metal distribution and prevent aggregation during subsequent processing steps
Solution Approach 2:
The silane coupling agent acts as an intermediary that enables uniform metal complex distribution on the carrier surface. The organic functional groups of the silane coupling agent provide consistent binding sites, ensuring even metal particle dispersion while maintaining simple production procedures
3Ease of operation
If the carrier surface is modified with organic groups to fix metal complexes, then the metal complex can be fixed on the carrier, but the catalytic activity and selectivity are reduced
Solution Approach 1:
The patent applies local quality by modifying only the surface layer of the inorganic oxide carrier with silane coupling agents, while keeping the bulk carrier properties unchanged. The silane coupling agent creates localized functional groups on the surface that can bind metal complexes without affecting the overall carrier structure or metal complex catalytic properties
Solution Approach 2:
The silane coupling agent serves as an intermediary layer between the inorganic oxide carrier and the metal complex, providing specific functional groups that bind the metal complex while preserving its catalytic activity and selectivity
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 method maintains the catalytic activity of the original metal complex and achieves a higher catalytic activity in supported metal catalysts compared to conventional methods, with improved dispersion and stability of metal particles on the carrier.
Implementation Method 1
a skeletal structure in which a disiloxane group is coordinated as a chelate to a central metal
Implementation Method 2
fixing the metal complex on an inorganic oxide while retaining a skeletal structure
Implementation Method 3
a method for producing a supported metal catalyst by calcining the supported metal complex
Data Source
AI summary
A metal complex represented by the following Formula (1):(wherein M represents palladium or platinum; L represents a ligand selected from carbon monoxide, an olefin compound, an amine compound, a phosphine compound, an N-heterocyclic carbene compound, a nitrile compound and an isocyanide compound; n represents an integer of 0 to 2 showing the number of the ligand; and each of R1 to R4 represents an organic group). The metal complex described above can be fixed on an inorganic oxide while maintaining a skeletal structure thereof to obtain a supported metal complex, and this makes it possible to allow the supported metal complex to maintain the same catalytic activity as that of the original metal complex.Also, calcining the supported metal complex obtained in the manner described above makes it possible to obtain a supported metal catalyst which is improved in catalytic activity to a greater extent than conventional supported metal catalysts.