Porous Material Impregnation Using Sacrificial Reductants
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Solution Overview
Problem
Existing methods for impregnating porous materials with active catalysts often result in residue deposition and loss of expensive metals during drying or heat treatment, leading to reduced catalyst performance and increased costs.
Innovation Solution
A processing solution comprising a metal salt, acid, solvent, and non-metal reductant is used to impregnate porous materials, with the non-metal reductant volatilizing or decomposing at low temperatures, leaving only elemental metal on the surface, thereby minimizing residue and enhancing catalyst activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional impregnation methods are used to deposit metal on porous material, then catalyst performance is reduced due to residue deposition, but using additional processing steps or chemicals increases process complexity
Solution Approach 1:
The patent uses a sacrificial organic compound (sugar, starch, or cellulose) that decomposes completely during drying or heat treatment, leaving no residue. This disposable organic material serves as a temporary carrier for the metal salt solution, enabling complete solvent evaporation without forming harmful deposits on the catalyst surface.
Solution Approach 2:
The patent changes the chemical composition parameters of the processing solution by adding specific organic compounds (sugar, starch, or cellulose) at controlled concentrations (0.1-10 wt%). These parameter changes modify the drying behavior and decomposition characteristics of the solution, ensuring complete volatilization without residue formation, thereby improving catalyst performance.
2Loss of substance
If conventional impregnation methods are used to deposit metal on porous material, then expensive metal loss occurs during drying or heat treatment, but implementing protective measures increases process complexity
Solution Approach 1:
The sacrificial organic compound acts as a temporary protective medium that holds the metal salt in solution during application and then completely decomposes during drying or heat treatment. This eliminates metal loss that would otherwise occur during solvent evaporation, as the organic matrix disintegrates cleanly without requiring complex protective atmospheres or additional processing steps.
Solution Approach 2:
The patent converts the potential harm of organic decomposition (which could leave carbonaceous residues) into a benefit by selecting specific organic compounds (sugars, starches, celluloses) that decompose completely to volatile products. The decomposition process, rather than creating harmful residues, actually facilitates complete metal salt decomposition and prevents metal loss, improving both metal retention and catalyst performance.
3Manufacturing precision
If incipient wetness impregnation is used to minimize solution excess, then metal dispersion is improved, but complete solvent removal becomes difficult leading to residue formation
Solution Approach 1:
The organic compound (sugar, starch, or cellulose) serves as a disposable sacrificial material that maintains the metal salt solution structure during incipient wetness impregnation, ensuring good metal dispersion throughout the porous material. During subsequent drying or heat treatment, this organic matrix completely decomposes and volatilizes, leaving no residue behind. The organic compound thus enables complete solvent removal while maintaining precise metal dispersion.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the processing solution by incorporating organic compounds at specific concentrations (0.1-10 wt%). These parameter changes alter the drying characteristics and thermal decomposition behavior of the solution, enabling complete solvent and organic material removal without residue formation, while maintaining optimal metal dispersion achieved through incipient wetness impregnation.
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 improves catalyst performance by reducing residue deposition and loss of expensive metals, resulting in higher catalyst activity and lower costs compared to conventional methods.
Implementation Method 1
the non-metal reductant is configured to volatize or decompose at a temperature that is less than about 900° C.
Implementation Method 2
the non-metal reductant is configured to volatize or decompose at a temperature that is less than about 900° C.
Implementation Method 3
Capillary action can draw the solution into the pores of the porous material.
Implementation Method 4
Inclusion of a non-metal reductant (e.g., a saccharide) in the processing solution may mitigate and/or eliminate loss of the desired substance from the surface of the porous material during drying or heat treatment
Data Source
AI summary
The present disclosure is directed to a processing solution composition comprising a metal salt, an acid, a solvent, and a non-metal reductant. The present disclosure is also directed to a method of impregnating a porous material by covering or coating the porous material with a processing solution comprising a metal salt, an acid, a solvent, and a non-metal reductant.