Porous Coordination Polymer Hydrogen Selectivity
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Solution Overview
Problem
Existing porous coordination polymers fail to effectively separate hydrogen molecules from gaseous mixtures due to structural limitations, allowing impurities like nitrogen, oxygen, and carbon dioxide to enter the lattice, resulting in low hydrogen selectivity and absorption efficiency.
Innovation Solution
A novel porous coordination polymer is developed with unit lattices having a Zn4O cluster at the vertices and acetylene dicarboxylic acid dianion sides, ensuring the lattice is empty or contains only hydrogen molecules, allowing for selective hydrogen absorption while excluding impurities based on kinetic diameter differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional porous coordination polymers with cubic unit lattices are used, then the structure allows easy formation, but impurity molecules (nitrogen, oxygen, carbon dioxide) can enter the lattice, resulting in low hydrogen selectivity
Solution Approach 1:
The patent applies local quality by creating distinct regions within the unit lattice: Zn4O clusters at vertices provide hydrogen binding sites, while the cavity interior provides exclusion zones for impurities. This spatial differentiation of functions within the lattice structure achieves high hydrogen selectivity without requiring complex external systems
Solution Approach 2:
The patent introduces asymmetry by placing Zn4O clusters specifically at the vertices of the cubic unit lattice rather than distributing them uniformly. This asymmetric arrangement creates directional selectivity where hydrogen molecules can access specific sites while impurity molecules are sterically hindered, resolving the contradiction between simple structure and high selectivity
2Quantity of substance
If the unit lattice contains empty space, then hydrogen molecules can be stored, but the structure may allow impurity molecules to enter and occupy the same space
Solution Approach 1:
The patent uses Zn4O clusters as intermediary structures that mediate between the external environment and the internal cavity. These clusters act as selective gateways that facilitate hydrogen molecule entry while blocking impurity molecules, allowing the cavity to maintain both accessibility for storage and exclusivity for purity
Solution Approach 2:
The patent employs porous coordination polymer structure where the porous nature is controlled at the molecular level. The pores are sized and shaped to allow hydrogen molecules to diffuse in while excluding larger impurity molecules, achieving both high storage capacity and maintained hydrogen purity through intrinsic material design
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 polymer achieves high hydrogen selectivity and absorption efficiency, effectively separating hydrogen from impurities, as demonstrated by X-ray diffraction analysis and gas sorption experiments, enhancing hydrogen storage and purification processes.
Implementation Method 1
at least a part of the unit lattices contains at least one hydrogen molecule
Implementation Method 2
separating hydrogen molecules from a gaseous mixture of the hydrogen molecules and impurity molecules
Data Source
AI summary
The present invention provides a porous coordination polymer, wherein the porous coordination polymer is formed of unit lattices; each of the unit lattices has a shape of a cube having eight vertexes and twelve sides; each of the vertexes of the unit lattices consists of a Zn4O cluster; each of the sides of the unit lattices consists of a −OOC—C≡C—COO− group. At least a part of the unit lattices contains at least one hydrogen molecule only, or the inside of at least a part of the unit lattices is empty. The present invention provides a novel porous coordination polymer, especially, a porous coordination polymer suitable for separating hydrogen molecules from a gaseous mixture of the hydrogen molecules and impurity molecules (e.g., nitrogen molecules, oxygen molecules, or carbon dioxide molecules).