Molded RuO2/TiO2 Catalyst for Fixed-Bed HCl Oxidation
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Solution Overview
Problem
Existing catalysts for hydrogen chloride oxidation reactions face limitations due to reactor type and operating conditions, leading to reduced catalytic activity and thermal stability, especially when used in fixed bed reactors, and often result in differential pressure issues.
Innovation Solution
A molding catalyst is developed by incorporating 0.5 to 20 parts by weight of a heterogeneous material, 0.1 to 20 parts by weight of ruthenium oxide, and 60 to 99 parts by weight of a support, using a multi-step process involving supporting, drying, and calcining to create a catalyst that is easy to handle and applicable to various reactors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a powder-type catalyst is used in a fixed bed reactor, then the catalyst can be applied to the reactor, but differential pressure is generated at the front and rear ends of the catalyst bed making operation impossible
Solution Approach 1:
The patent changes the physical form parameter of the catalyst from powder to molded pellets. This parameter change eliminates differential pressure issues in fixed bed reactors while maintaining catalytic activity, making the catalyst both applicable to fixed bed reactors and operationally feasible.
2Productivity
If a supported ruthenium oxide catalyst is used, then high catalytic activity can be achieved, but thermal stability and catalyst life cannot be simultaneously satisfied
Solution Approach 1:
The patent creates a composite catalyst structure where ruthenium oxide active components are supported on titanium oxide carriers that have been treated with heterogeneous materials (such as metal oxides). This composite structure maintains high catalytic activity while improving thermal stability and extending catalyst life through the synergistic effects of the multiple components.
Solution Approach 2:
The patent applies heterogeneous materials locally to specific regions or surfaces of the titanium oxide support, creating zones with different properties. This allows the catalyst to maintain high activity in contact with reactants while providing thermal stability in structural regions, resolving the contradiction between activity and reliability.
3Productivity
If conventional catalysts are used for hydrogen chloride oxidation, then the reaction can proceed, but catalyst performance decreases in a short period of several months during high-temperature operation
Solution Approach 1:
The patent incorporates heterogeneous materials and stabilizing components into the catalyst structure before use, providing protective effects that prevent degradation during high-temperature operation. This beforehand cushioning ensures the catalyst maintains performance over extended periods, addressing both productivity and duration requirements.
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 activity and thermal stability, preventing differential pressure in fixed bed reactors, enabling efficient hydrogen chloride oxidation to chlorine with improved durability and versatility.
Implementation Method 1
a ruthenium-based catalyst, a copper-based catalyst, and a cerium-based catalyst. The ruthenium-based catalyst has a lower reaction temperature with a small amount of catalyst than the copper-based catalyst or the cerium-based catalyst.
Implementation Method 2
hydrogen chloride is oxidized with oxygen to form chlorine in an exothermic equilibrium reaction
Implementation Method 3
it is difficult for a supported ruthenium oxide to simultaneously satisfy both conditions for thermal stability and catalyst life
Implementation Method 4
when a powder-type catalyst is used in a fixed bed reactor, a differential pressure is generated at the front and rear ends of a catalyst bed, which may cause a problem in that operation is impossible
Data Source
AI summary
The present invention relates to a method for producing a molding catalyst for obtaining chlorine (Cl2) through an oxidation reaction of hydrogen chloride (HCl), and more specifically, to a method for producing an oxidation reaction molding catalyst by adding heterogeneous material to a ruthenium oxide (RuO2)-supported catalyst having titanium oxide (TiO2) as a supporting body, and molding so as to be usable in a fixed bed reactor to produce chlorine (Cl2) from hydrogen chloride (HCl).