Ruthenium Oxide Catalyst Pore Structure for HCl Oxidation
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Solution Overview
Problem
Catalysts used in the oxidation of hydrogen chloride by fixed-bed reaction method tend to sinter over time, leading to decreased catalyst activity and hydrogen chloride conversion.
Innovation Solution
A catalyst with a broader pore distribution curve, characterized by a BET specific surface area of 1 to 250 m2/g and a H/D ratio of 0.6 to 1.5, preferably made of supported ruthenium oxide and molded into spherical or cylindrical shapes, is used to maintain catalyst activity and prevent sintering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a catalyst with sharp pore distribution is used, then mechanical strength is improved, but sintering occurs easily under fixed-bed reaction conditions
Solution Approach 1:
The invention changes the pore distribution parameter from sharp (H/D < 0.6) to broader (H/D ≥ 0.6), which fundamentally alters the catalyst's thermal behavior under fixed-bed conditions. This parameter change prevents sintering while maintaining mechanical strength, resolving the contradiction between strength and activity stability.
2Productivity
If a catalyst with narrow pore distribution is used, then initial catalyst activity is improved, but hydrogen chloride conversion decreases with time
Solution Approach 1:
The invention modifies the pore distribution parameter (H/D ratio) from narrow to broader distribution. This change maintains high initial activity while preventing the time-dependent deactivation caused by sintering, thus extending the catalyst's effective duration under fixed-bed reaction conditions.
3Adaptability or versatility
If a catalyst is designed for fluidized-bed reaction method, then mechanical strength is improved, but sintering occurs under fixed-bed conditions
Solution Approach 1:
The invention changes the pore distribution parameter to create a catalyst that is versatile across both fluidized-bed and fixed-bed reaction methods. The broader pore distribution (H/D ≥ 0.6) prevents sintering in fixed-bed conditions while maintaining the mechanical strength needed for fluidized-bed applications, achieving adaptability to multiple reaction methods.
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 hydrogen chloride conversion and catalyst activity over a long period, suitable for fixed-bed reaction methods, by optimizing pore structure and composition.
Implementation Method 1
a catalyst which contains ruthenium oxide and satisfies the following conditions (i) and (ii): (i) the BET specific surface area is from 1 to 250 m2/g; and (ii) the value of H/D, wherein H is the half width of the peak of a pore distribution curve as determined by a mercury intrusion method; and D is the average pore diameter, is from 0.6 to 1.5
Implementation Method 2
when the catalyst is used in an oxidation reaction of hydrogen chloride by a fixed-bed reaction method, sintering of the catalyst easily occurs due to heat history with the passage of the reaction time
Implementation Method 3
a method for producing chlorine by oxidizing hydrogen chloride with oxygen in the presence of a catalyst
Data Source
AI summary
A method for producing chlorine by oxidizing hydrogen chloride with oxygen in the presence of a catalyst, wherein the catalyst satisfies the following conditions (i) and (ii): (i) the BET specific surface area is from 1 to 250 m2/g; and (ii) the value of H/D, wherein H is the half width of the peak of a pore distribution curve as determined by a mercury intrusion method; and D is the average pore diameter, is from 0.6 to 1.5.