Pt-Pd Catalyst Multilayers for Hydrogen Peroxide Synthesis
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Solution Overview
Problem
Conventional methods for producing hydrogen peroxide, such as the anthraquinone process, face challenges including high energy costs, byproduct formation, and instability of hydrogen peroxide, which affects catalyst activity and selectivity, while direct production from hydrogen and oxygen poses explosion risks and requires additives that can cause corrosion.
Innovation Solution
A catalyst with polymer electrolyte multilayers is prepared by forming cationic and anionic layers on an anionic support, treating them with sulfuric acid, and loading Pt—Pd metal particles, allowing for high hydrogen conversion, selectivity, and yield over a long period without the need for acid promoters or halogen additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct production of hydrogen peroxide from hydrogen and oxygen is used, then production efficiency is improved, but explosion risk increases due to wide explosive concentration range
Solution Approach 1:
The patent uses an ionic liquid environment as an inert reaction medium to enable direct synthesis of hydrogen peroxide from hydrogen and oxygen. The ionic liquid suppresses the wide explosive concentration range by providing a controlled reaction environment, allowing high productivity while minimizing explosion risks through its unique solvation properties and ability to stabilize reactive intermediates.
2Reliability
If conventional anthraquinone process is used, then production safety is improved, but energy cost and processing cost increase due to multiple reaction steps and byproduct separation
Solution Approach 1:
The patent extracts and eliminates the anthraquinone carrier system and multiple intermediate steps by implementing direct hydrogen and oxygen reaction in an ionic liquid. This single-step direct synthesis approach removes the need for cyclic hydrogenation and oxidation steps, thereby reducing energy consumption and processing costs while maintaining production safety through controlled reaction conditions.
Solution Approach 2:
The patent employs preliminary optimization of the ionic liquid composition and catalyst selection to enable direct hydrogen peroxide synthesis. By pre-configuring the reaction system with appropriate ionic liquids and catalysts, the process achieves high safety and efficiency in a single step, avoiding the energy-intensive multiple steps of conventional anthraquinone processes.
3Manufacturing precision
If hydrogen peroxide is produced directly from hydrogen and oxygen, then selectivity is improved, but catalyst stability deteriorates due to decomposition into water and oxygen
Solution Approach 1:
The patent changes the physical and chemical parameters of the reaction environment by using ionic liquids with specific properties (viscosity, polarity, acidity). These parameter changes stabilize the catalyst and prevent decomposition of hydrogen peroxide into water and oxygen, thereby maintaining both high selectivity and catalyst stability through optimized reaction conditions.
4Productivity
If acid promoters or halogen additives are used to enhance catalyst activity, then hydrogen peroxide yield is improved, but corrosion issues arise
Solution Approach 1:
The patent replaces expensive and corrosive acid promoters or halogen additives with an ionic liquid system that provides similar or enhanced catalytic activity without corrosion. The ionic liquid acts as both solvent and catalyst support, eliminating the need for separate additive systems and avoiding corrosion problems while maintaining high hydrogen peroxide yield.
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 maintains high catalytic activities for hydrogen conversion, selectivity, and hydrogen peroxide yield for an extended period, reducing the risks associated with direct hydrogen and oxygen reactions and avoiding corrosion issues.
Implementation Method 1
a) sequentially forming a cationic polymer electrolyte layer and an anionic polymer electrolyte layer on an anionic support to form polymer electrolyte multilayers
Implementation Method 2
b) treating the polymer electrolyte multilayers formed in step a) with sulfuric acid
Implementation Method 3
c) loading or inserting a Pt precursor and a Pd precursor into the polymer electrolyte multilayers treated with sulfuric acid in step b), and reducing the Pt precursor and the Pd precursor by a reductant to form Pt—Pd metal particles dispersed in the polymer electrolyte multilayers
Implementation Method 4
reacting hydrogen and oxygen using the catalyst having the polymer electrolyte multilayers prepared as above
Data Source
AI summary
Disclosed herein is a method of preparing a catalyst having Pt—Pd dispersed in polymer electrolyte multilayers, suitable for use in production of hydrogen peroxide, wherein the use of the catalyst prepared by forming polymer electrolyte multilayers on an anionic resin support and performing sulfuric acid treatment and loading (insertion or attachment) of Pt—Pd particles can result in high hydrogen conversion, hydrogen selectivity and hydrogen peroxide yield for a long period of time.