Sulfated Titanium Dioxide Gold Palladium Catalyst Stability

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Solution Overview

Problem

Supported palladium-gold catalysts used in acetoxylation often suffer from deactivation, leading to reduced activity stability and increased costs, as they require high precious metal loads and lack effective methods for maintaining productivity over time.

Innovation Solution

A method involving sulfating a titanium dioxide support, calcining it, and then treating it with palladium and gold salts in the presence of an alkali or ammonium compound, followed by partial decomposition and reduction, to enhance catalytic activity and stability in acetoxylation reactions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If supported palladium-gold catalysts are used in acetoxylation, then catalytic activity is achieved, but activity stability deteriorates due to catalyst deactivation

Engineering Contradiction:

Improveactivity stabilityVSAvoidcatalyst productivity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The support is sulfated and calcined before catalyst preparation to create a stable foundation that prevents subsequent catalyst deactivation. This preliminary treatment of the support modifies its surface properties to enhance long-term catalyst stability and resistance to poisoning

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention changes the chemical composition and surface properties of the support by introducing sulfate groups and performing controlled calcination. These parameter changes in the support structure create a more stable environment for the catalyst, preventing deactivation while maintaining activity

Inventive Principle:

Principle #35Parameter changes

2Productivity

If high precious metal loads are used to maintain productivity, then catalytic activity is improved, but cost increases

Engineering Contradiction:

Improvecatalyst productivityVSAvoidprecious metal content

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The sulfated and calcined support acts as an intermediary that enhances the effectiveness of the precious metal catalyst. The modified support surface improves metal dispersion and stability, allowing lower metal loads to achieve the same productivity levels as higher loads in conventional systems

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP1984113B1Catalyst for co oxidation comprising dispersed gold atoms

Publication Date: 2019.02.27 LYONDELLBASELL ACETYLS LLC

AI summary

A new method for preparing supported palladium-gold catalysts is disclosed. The method comprises sulfating a titanium dioxide support, calcining the sulfated support, impregnating the calcined support with a palladium salt, a gold salt, and an alkali metal or ammonium compound, calcining the impregnated support, and reducing the calcined support. The resultant supported palladium-gold catalysts have increased activity and stability in the acetoxylation.