Noble Metal Polyoxometalates for Catalytic Reduction
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Solution Overview
Problem
Current polyoxometalates (POMs) primarily contain early transition metals, with few incorporating noble metals, limiting their catalytic efficiency and selectivity in homogeneous or heterogeneous applications.
Innovation Solution
Development of POMs with a major proportion of noble metal atoms, specifically represented by the formula (A n ) m+ {M' s [M" 12 X 8 O y ]} m-, where A represents cations like Li, K, or Na, M and M' are Pd or Pt, and M" includes Ag, Au, Rh, Ir, and Pt, with X being P, As, or Bi, forming square-planar MO 4 building blocks for enhanced catalytic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If POMs are based on early transition metals (Group 5 and 6), then the structural framework is stable and well-established, but the catalytic efficiency and selectivity are limited
Solution Approach 1:
The patent changes the metallic composition parameter of POMs by incorporating noble metals (Pd, Pt, Au, Ag, Rh, Ir) to replace or supplement early transition metals, thereby improving catalytic efficiency while maintaining the polyoxometalate structural framework
Solution Approach 2:
The patent creates composite POM structures combining noble metal atoms within the polyoxometalate framework, forming new composite materials that exhibit both the structural stability of POMs and the superior catalytic properties of noble metals
2Productivity
If POMs incorporate noble metals, then catalytic selectivity improves, but the complexity of POM synthesis increases
Solution Approach 1:
The patent uses pre-formed polyoxometalate clusters as templates and incorporates noble metals during or after cluster formation, simplifying the synthesis by avoiding the need to build the entire structure from individual atoms
Solution Approach 2:
The patent employs stabilizing agents and ligands as intermediaries to facilitate the incorporation of noble metals into POM structures, managing the complexity of multi-metal assembly through mediating species
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 noble metal-containing POMs exhibit unique catalytic performance in reduction reactions due to high noble metal concentration and accessibility, achieving improved efficiency and selectivity in catalytic processes.
Implementation Method 1
The noble metal-containing POMs exhibit unique catalytic performance in reduction reactions due to high noble metal concentration and accessibility, achieving improved efficiency and selectivity in catalytic processes
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
The invention relates to polyoxometalates represented by the formula (An)m+{M's[M''M12X8OyRzHq]}m- or solvates thereof, corresponding supported polyoxometalates, and processes for their preparation, as well as corresponding metal-clusters, optionally in the form of a dispersion in a liquid carrier medium or immobilized on a solid support, and processes for their preparation, as well as their use in reductive conversion of organic substrate.