Molecular Sieve-Confined Ir Nanoclusters for Stable CO-SCR Denitrification
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Solution Overview
Problem
Ir-based catalysts for CO-SCR face issues such as low utilization rate of active metals, difficult adjustment of active sites, poor oxygen and sulfur resistance, and poor catalyst stability, limiting their industrial application.
Innovation Solution
A molecular sieve confined noble metal catalyst is prepared through a one-pot hydrothermal method with in-situ synthesis-ligand protection, using Ir metal nanoclusters encapsulated in a molecular sieve carrier, optimizing the utilization rate and stability of active components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If Ir-based catalysts are used for CO-SCR, then catalytic activity is improved, but utilization rate of active metals deteriorates
Solution Approach 1:
The patent employs molecular sieve materials with specific pore structures to confine and disperse Ir metal nanoclusters. The porous structure provides high surface area and uniform distribution of active sites, enhancing catalytic activity while improving metal utilization through controlled confinement effects within the pores.
Solution Approach 2:
The patent creates composite catalyst systems combining Ir metal nanoclusters with molecular sieve supports. This composite structure synergistically combines the high catalytic activity of Ir with the structural stability and dispersion capabilities of molecular sieves, achieving both high activity and improved metal utilization.
2Power
If Ir-based catalysts are used for CO-SCR, then catalytic activity is improved, but catalyst stability deteriorates
Solution Approach 1:
The molecular sieve porous structure provides physical confinement that stabilizes Ir nanoclusters, preventing their aggregation and sintering under reaction conditions. The rigid framework maintains structural integrity while accommodating the active metal species.
Solution Approach 2:
The patent nests Ir metal nanoclusters within the molecular sieve pores, creating a hierarchical structure where the active metal is embedded within the stable support framework. This nesting approach protects the Ir clusters while maintaining their catalytic functionality.
3Power
If Ir-based catalysts are used for CO-SCR, then catalytic activity is improved, but oxygen and sulfur resistance deteriorates
Solution Approach 1:
The patent modifies the chemical environment around Ir active sites through molecular sieve confinement, changing the electronic and geometric parameters of the catalyst. This creates a more resistant catalyst structure that maintains activity under oxygen-containing and sulfur-containing conditions.
Solution Approach 2:
The composite structure of Ir nanoclusters within molecular sieves provides synergistic resistance to oxygen and sulfur poisoning. The molecular sieve framework acts as a protective barrier while the Ir clusters maintain their catalytic function.
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 exhibits enhanced catalytic activity and stability, addressing the limitations of existing Ir-based catalysts and offering improved performance in CO-SCR denitrification processes.
Implementation Method 1
a molecular sieve confined noble metal catalyst for CO-SCR denitrification includes a molecular sieve carrier and Ir metal nanoclusters (Ir metal nanoclusters are used as active components of the catalyst) loaded in the molecular sieve carrier through confined encapsulation
Implementation Method 2
CO-SCR technology, using the original CO in flue gas as reducing agent, has attracted more and more attention. CO-SCR technology has the characteristics of less secondary pollution and simple operation
Data Source
AI summary
A molecular sieve confined noble metal catalyst for CO-SCR denitrification, a preparation method and an application thereof are provided. The catalyst includes a molecular sieve carrier and Ir metal nanoclusters loaded in the molecular sieve carrier through confined encapsulation. The preparation method includes the following steps: mixing a first metal precursor solution with a first ligand to obtain a first mixed solution; mixing a second metal precursor solution with a second ligand to obtain a second mixed solution; mixing a silicon source, an aluminum source, an alkali and a solvent to obtain a molecular sieve precursor solution; mixing the molecular sieve precursor solution with the first mixed solution, then adding the second mixed solution for hydrothermal crystallization reaction, and then centrifugally washing, drying and calcining to obtain the catalyst.