Gold Catalyst Acrolein Oxidation Selectivity
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Solution Overview
Problem
Current methods for preparing acrylic acid through liquid-phase oxidation of acrolein are inefficient and require improvement, as they often result in lower selectivity and yields due to the use of cobalt-based catalysts and other limitations.
Innovation Solution
A method involving the liquid-phase oxidation of acrolein using a heterogeneous gold catalyst supported on oxides such as γ-, δ-, or θ-alumina, titania, or ceria, with specific structural and compositional characteristics, to enhance the production of acrylic acid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cobalt-based catalysts are used for liquid-phase oxidation of acrolein, then the oxidation reaction can proceed, but the selectivity and yield of acrylic acid are low due to side-product formation
Solution Approach 1:
The patent changes the catalyst material parameter from cobalt-based to gold-based catalyst, which fundamentally alters the reaction pathway and selectivity. This parameter change resolves the contradiction by enabling high acrylic acid yield while minimizing side-product formation through the unique catalytic properties of gold nanoparticles
Solution Approach 2:
The patent employs composite catalyst structures consisting of gold particles supported on metal oxides (such as alumina, titania, or ceria). This composite material approach enhances catalyst stability and selectivity, achieving both high productivity and reduced harmful side-products through synergistic effects between the gold active sites and the support material
2Ease of manufacture
If liquid-phase oxidation is used instead of gas-phase oxidation, then milder conditions and smaller equipment are required, but the process efficiency and selectivity are insufficient
Solution Approach 1:
The patent optimizes multiple parameters including catalyst composition (gold loading 0.1-10 wt%), particle size (1-100 nm), and reaction conditions (temperature 20-100°C, oxygen pressure 1-50 atm). These parameter changes enable liquid-phase oxidation to achieve both mild operating conditions and high oxidation efficiency, resolving the contradiction between ease of manufacture and productivity
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
This approach increases the selectivity and yield of acrylic acid production, while minimizing the formation of side-products, thereby improving the overall efficiency of the process.
Implementation Method 1
contacting a liquid mixture comprising acrolein and water in the presence of oxygen with a heterogeneous catalyst comprising a support and gold
Implementation Method 2
liquid-phase oxidation of acrolein to form acrylic acid
Data Source
AI summary
A method for preparing acrylic acid from acrolein. The method comprises contacting a liquid mixture comprising acrolein and water in the presence of oxygen with a heterogeneous catalyst comprising a support and gold; wherein the support comprises an oxide selected from γ-, δ-, or θ-alumina, magnesia, titania, zirconia, hafnia, vanadia, niobium oxide, tantalum oxide, ceria, yttria, lanthanum oxide, zinc oxide or a combination thereof.