Porous Oxide Synthesis via Polyester Polyol Pyrolysis
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Solution Overview
Problem
Current methods for synthesizing porous oxides face challenges in controlling pore size and distribution, leading to difficulties in achieving uniform and adjustable pore sizes, which affects their applications in catalysis and other fields.
Innovation Solution
A preparation method involving the roasting of a polyester polyol polymer, obtained through a transesterification reaction between an oxygen-containing acid ester and a polyol, allows for the synthesis of porous oxides with controllable mesopore, micropore, and macropore distributions, enabling adjustable pore sizes and high designability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a sol-gel method using a soft template is used to synthesize porous oxide, then the porous oxide can be obtained, but it is difficult to control the pore size and specific surface area, and the use of surfactant leads to high cost
Solution Approach 1:
The invention extracts and removes the surfactant template from the synthesis process entirely. Instead of using soft templates, the method employs hard templates (such as colloidal crystals, porous silica, or metal oxides) that provide predetermined pore structures. The hard template is removed after forming the porous oxide framework, leaving behind well-defined pores without requiring organic surfactants, thus achieving both cost reduction and precise pore size control.
Solution Approach 2:
The invention changes the fundamental parameter of template type from soft (surfactant-based) to hard (inorganic or colloidal). This parameter change enables precise control over pore size, shape, and distribution because hard templates maintain their structural integrity during the sol-gel process and can be selected with predetermined pore dimensions. The template removal step then cleanly defines the final pore architecture without the control difficulties associated with soft templates.
2Manufacturing precision
If a sol-gel method using a soft template is used to synthesize porous oxide, then the porous oxide can be obtained, but the hydrolysis rates of some parts of the raw material do not match with each other
Solution Approach 1:
The invention introduces hard templates as intermediary structures that mediate the formation of the porous oxide framework. These hard templates act as physical guides that dictate where pores should form and what their dimensions should be, independent of the hydrolysis rates of different raw materials. The template framework ensures uniform pore distribution even when hydrolysis rates vary, as the pore structure is imposed by the template rather than emerging from uncontrolled hydrolysis kinetics.
Solution Approach 2:
The invention performs preliminary structuring by first establishing the hard template framework before the sol-gel reaction proceeds. The hard template is prepared in advance with the desired pore architecture, and then the porous oxide forms around this pre-established framework. This preliminary action ensures that pore distribution is determined by the template structure rather than by variations in hydrolysis rates during the reaction process.
3Manufacturing precision
If traditional polyester polyol is used as raw material, then the synthesis process is conventional, but the pore size and distribution cannot be uniformly controlled
Solution Approach 1:
The invention employs a universal hard template approach that can be applied to synthesize porous oxides with different pore sizes and distributions using the same fundamental methodology. By selecting different hard templates (colloidal crystals with various particle sizes, porous silica with different pore diameters, or metal oxide frameworks with varying structures), the same sol-gel process can produce porous oxides tailored for different applications, achieving both uniformity and adjustability.
Solution Approach 2:
The invention creates composite structures during synthesis where the porous oxide forms around or with the hard template. This composite approach allows the final material to inherit the precise structural characteristics of the hard template while incorporating the chemical properties of the porous oxide. The composite formation process ensures uniform pore size controlled by the template, while template selection provides adjustability for different applications.
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 provides porous oxides with uniform and adjustable pore sizes, enhancing their applicability in adsorptive separation, catalytic oxidation, and fine chemistry, overcoming the limitations of traditional synthesis methods.
Implementation Method 1
roasting a raw material including the polyester polyol to obtain the porous oxide
Implementation Method 2
subjecting an oxygen-containing acid ester and a polyol to a transesterification reaction to obtain the polyester polyol
Data Source
AI summary
A preparation method of a porous oxide is provided, which includes: preparing the porous oxide with a polyester polyol as a raw material. The porous oxide prepared by the preparation method in the present application has characteristics such as uniform and adjustable pore sizes and controllable distribution of mesopores, micropores, and macropores.