ZrO2-Al2O3 Composite Solid Acid Catalyst for D-Galactose Production
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Solution Overview
Problem
The existing solid acid catalysts, particularly those using aluminum oxide as a carrier, suffer from a dense crystal structure with few pores, limiting their catalytic performance due to restricted sulfonyl loading and active site exposure, making them inefficient for industrial production of D-galactose.
Innovation Solution
A composite solid acid catalyst is developed using a zirconium dioxide and aluminum oxide skeleton, enhanced through a hydrothermal reaction with an organic template, which increases the specific surface area and stability, allowing for improved sulfonyl loading and catalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If aluminum oxide is used as a carrier for solid acid catalyst, then the catalyst structure is simple and easy to manufacture, but the specific surface area is small and catalytic performance is limited
Solution Approach 1:
The patent combines zirconium dioxide and aluminum oxide to form a composite carrier material. The zirconium dioxide component provides high specific surface area and porous structure, while aluminum oxide contributes structural stability. This composite approach resolves the contradiction by achieving both large surface area (improving catalytic performance) and structural simplicity (maintaining ease of manufacture).
Solution Approach 2:
The patent utilizes the inherently porous structure of zirconium dioxide to create a carrier with high specific surface area. The porous morphology provides numerous active sites for catalysis while maintaining a straightforward synthesis process through hydrothermal treatment, thus improving catalytic performance without significantly complicating manufacturing.
2Stability of the object's composition
If aluminum oxide with dense crystal structure is used as carrier, then the structural stability is good, but the number of pores is few and sulfonyl loading is limited
Solution Approach 1:
The composite of zirconium dioxide and aluminum oxide combines the structural stability of aluminum oxide with the high porosity and surface area of zirconium dioxide. This allows the carrier to maintain structural integrity while providing abundant pores and surface sites for sulfonyl group loading, thus resolving the contradiction between stability and loading capacity.
Solution Approach 2:
The patent exploits the porous nature of zirconium dioxide to create a carrier framework with numerous pores. This porous structure dramatically increases the available surface area and pore volume for sulfonyl loading, while the composite structure with aluminum oxide maintains the necessary structural stability for industrial application.
3Ease of operation
If traditional solid acid catalyst is used, then the operation process is simple, but the catalytic efficiency is low and service life is short
Solution Approach 1:
The zirconium dioxide-aluminum oxide composite carrier provides superior catalytic efficiency through its high specific surface area and stable structure. The composite structure maintains ease of operation by following standard catalyst handling procedures, while the enhanced physical and chemical properties deliver improved catalytic performance and extended service life.
Solution Approach 2:
The patent changes the physical parameters of the carrier (specific surface area, pore volume, porosity) through the use of zirconium dioxide composite material. These parameter changes directly improve catalytic efficiency by providing more active sites and better mass transfer, while the material's inherent stability extends service life without complicating operational procedures.
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 efficiency, stability, and long service life, with the ability to be repeatedly used, significantly reducing costs and improving the industrial production of D-galactose.
Implementation Method 1
S14. subjecting a reaction system obtained in S13 to a hydrothermal reaction to obtain a mixed crystal ZrO2/Al2O3
Implementation Method 2
S15. rapidly heating the mixed crystal ZrO2/Al2O3 obtained in S14 until the organic template is completely ashed
Implementation Method 3
S2. soaking the skeleton carrier obtained in S1 in concentrated sulfuric acid such that sulfonyl is loaded on the skeleton carrier to obtain the target solid acid
Implementation Method 4
Under the conditions of high temperature and high pressure, an inorganic acid is used to catalyze the hydrolysis of lactose into D-galactose and glucose
Implementation Method 5
lactose is subjected to hydrolysis with lactase to prepare D-galactose
Data Source
AI summary
Disclosed is a solid acid catalyst for preparing D-galactose and a preparation method thereof. The method includes: S1. synthesis of a skeleton carrier: S11. preparation of a sodium aluminate solution and an organic template solution; S12. mixing the sodium aluminate solution with the organic template solution, and thoroughly shaking a resulting mixture to obtain a mixed solution; S13. adding a zirconium source to the mixed solution obtained in S12, and thoroughly mixing; S14. subjecting a reaction system obtained in S13 to a hydrothermal reaction to obtain a mixed crystal ZrO2/Al2O3; and S15. rapidly heating the mixed crystal ZrO2/Al2O3 obtained in S14 until the organic template is completely ashed, and washing a resulting product with absolute ethanol to obtain a white solid ZrO2/Al2O3; and S2. soaking the skeleton carrier obtained in S1 in concentrated sulfuric acid such that sulfonyl is loaded on the skeleton carrier to obtain the target solid acid.