Coordination Complex-ZIF Hybrid Catalyst for Recovery and Activity
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Solution Overview
Problem
Current coordination complex compounds used as catalysts face challenges in recovery and reuse due to their homogeneous nature, leading to high manufacturing costs and limited catalytic activity when using expensive metals, and introducing coordination complexes into zeolitic imidazolate frameworks (ZIFs) is hindered by steric strain and instability of metal-imidazolate bonds.
Innovation Solution
A method is developed to prepare a coordination complex compound-ZIF complex by using a precursor with ligands that are more strongly or weakly bonded to the central metal than imidazolate, allowing direct chemical bonding to metal vacancy sites in ZIFs, enabling easy recovery and reuse while maintaining catalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If coordination complex compounds are used as homogeneous catalysts, then catalytic activity is improved, but recovery and reuse become extremely difficult
Solution Approach 1:
The patent uses ZIF as an intermediary carrier to support the coordination complex compound. The ZIF provides a heterogeneous support structure that allows the coordination complex to be easily separated and reused, while maintaining its catalytic activity. The coordination complex is anchored to the ZIF surface through coordination bonds, creating a hybrid catalyst system that combines the advantages of both homogeneous and heterogeneous catalysis.
Solution Approach 2:
The patent creates a composite material system consisting of ZIF support and coordination complex compound. This composite structure combines the high surface area and stability of ZIF with the high catalytic activity of the coordination complex, achieving both easy recovery and high productivity.
2Ease of manufacture
If coordination complex compounds are used as heterogeneous catalysts, then recovery and reuse are improved, but catalytic activity decreases compared to homogeneous catalysts
Solution Approach 1:
The ZIF acts as an intermediary that preserves the molecular structure and catalytic properties of the coordination complex while providing heterogeneous catalyst benefits. The coordination complex retains its active molecular units on the ZIF surface, maintaining high catalytic activity similar to homogeneous catalysts, while enabling easy separation and reuse.
Solution Approach 2:
The patent utilizes the porous structure of ZIF to support coordination complex compounds. The large surface area and pore structure of ZIF allow the coordination complex to maintain its molecular unit structure while being dispersed on the support, preserving high catalytic activity and enabling easy recovery through filtration or centrifugation.
3Ease of manufacture
If coordination complex compounds are introduced into ZIF metal vacancy sites, then easy recovery and reuse are achieved, but steric strain and bond instability hinder the process
Solution Approach 1:
The patent optimizes parameters such as pH, temperature, and coordination complex concentration to facilitate the introduction of coordination complexes into ZIF metal vacancy sites. By controlling these parameters, the patent overcomes steric strain and enhances the stability of metal-imidazolate bonds during the immobilization process.
Solution Approach 2:
The patent performs preliminary activation of ZIF by creating metal vacancy sites before introducing the coordination complex compound. This preliminary action facilitates the subsequent immobilization process by providing ready-made binding sites, reducing steric strain, and ensuring stable bonding between the coordination complex and ZIF support.
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 coordination complex compound-ZIF complex achieves high catalytic activity and can be easily recovered and reused, overcoming the limitations of homogeneous catalysts and steric issues in heterogeneous catalysts, making it industrially applicable.
Implementation Method 1
a complex in which a coordination complex compound is bonded to a ZIF and wherein a central metal of the coordination complex compound is chemically and directly bonded to a metal vacancy site of the ZIF
Data Source
AI summary
Proposed are a coordination complex compound-ZIF complex and a method of preparing the same. More particularly, proposed are a coordination complex compound-ZIF complex, which is a complex on which a coordination complex compound is supported by being chemically and directly bonded to a metal vacancy site of a ZIF, capable of being usable as a heterogeneous catalyst that can be recovered and reused in subsequent processes and maintaining catalytic functions of the coordination complex compound, which is an active ingredient, and to a method of preparing the same.