Shell Catalyst Preparation for Vinyl Acetate Monomer Synthesis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing vinyl acetate monomer (VAM) catalysts are limited by low activity and selectivity, and require additional promoter application steps, increasing production costs and complexity.
Innovation Solution
A method involving the sequential or simultaneous application of an acetate compound and Pd and Au precursor compounds to a support body, with optional inclusion of Cu and Sn precursor compounds, to create a shell catalyst with enhanced selectivity and activity, eliminating the need for additional promoter steps and improving noble metal yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If additional promoter application steps are added to produce promoted shell catalysts, then catalyst activity and selectivity are improved, but production cost and process complexity increase
Solution Approach 1:
The patent combines multiple metal precursors (Pd, Au, Cu, Sn) into a single mixed precursor solution that is applied to the support body in one step. This merging of application steps reduces process complexity while maintaining the catalytic functionality of multiple metals, thereby resolving the contradiction between catalyst activity and preparation complexity.
Solution Approach 2:
The mixed precursor solution serves multiple functions simultaneously: it provides Pd and Au for catalytic activity, Cu and Sn for promotion, and all components are delivered to the support body in a single application step. This multi-functionality eliminates the need for separate promoter application steps while maintaining high catalyst performance.
2Reliability
If conventional multi-step catalyst production methods are used, then catalyst selectivity is maintained, but noble metal yield is reduced
Solution Approach 1:
The patent applies all metal precursors (including Pd, Au, Cu, and Sn) to the support body before the catalytic reaction begins. This preliminary application of all components in a single step ensures maximum retention of noble metals and prevents loss during subsequent processing steps, thereby improving noble metal yield while maintaining selectivity.
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 results in shell catalysts with significantly increased selectivity and activity for VAM synthesis, reducing production costs and simplifying the process while optimizing noble metal yield.
Implementation Method 1
the metal components of the precursor compounds are converted to the elemental metals
Data Source
AI summary
A method for producing a shell catalyst which is suitable for the synthesis of alkenyl carboxylic acid esters, in particular for producing vinyl acetate monomer (VAM) from ethylene or allyl acetate monomer from propylene by means of oxy-acetylation. Also, a shell catalyst that can be obtained by the method according to the invention, as well as the use of the shell catalyst produced using the method for producing alkenyl carboxylic acid esters, in particular vinyl acetate monomer (VAM) and allyl acetate monomer.