Pt-Ir on SnO2 Methane Catalyst for Sulfur Oxide Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional Pt/SnO2-based catalysts for oxidatively removing methane from combustion exhaust gases containing sulfur oxide suffer from decreased activity due to catalyst poisoning by sulfur oxide, which deforms platinum oxides and leads to continuous activity loss despite reaching adsorption equilibrium.
Innovation Solution
A methane combustion catalyst with a specific ratio of platinum oxides to metal platinum (RTO ≥ 8.00 and ≤ 16.00) supported on a tin oxide carrier, produced through a method involving divided impregnation and controlled burning steps to maintain platinum in an oxidized state, and supplemented with iridium to enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a Pt/SnO2-based catalyst is used for oxidatively removing methane from combustion exhaust gas containing sulfur oxide, then methane combustion activity is improved, but catalyst activity is decreased by sulfur oxide poisoning
Solution Approach 1:
The invention changes the chemical state parameter of platinum from metallic form to oxidized form (PtO2). This parameter change makes the catalyst more resistant to sulfur oxide poisoning while maintaining high methane combustion activity, thus resolving the contradiction between initial activity and durability
Solution Approach 2:
The invention creates a composite catalyst system combining platinum oxide with tin oxide carrier. This composite structure provides both high catalytic activity for methane combustion and resistance to sulfur oxide poisoning, simultaneously achieving improved productivity and reliability
2Productivity
If platinum is supported on tin oxide carrier, then methane combustion activity is enhanced, but catalyst poisoning occurs when sulfur oxide is present
Solution Approach 1:
The invention changes the oxidation state parameter of platinum to create PtO2 on the SnO2 carrier. This parameter change fundamentally alters the catalyst's interaction with sulfur oxide, preventing poisoning while maintaining enhanced methane combustion activity
Solution Approach 2:
The invention converts the potential harm of sulfur oxide poisoning into a benefit by using the oxidized platinum state that is inherently more resistant to sulfur oxide. The same sulfur oxide that would poison metallic platinum is less effective against PtO2, thus converting a harmful interaction into a beneficial resistance
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 exhibits improved initial activity and durability, enabling effective methane combustion in the presence of sulfur oxide, maintaining high performance over time.
Implementation Method 1
a catalyst for oxidatively removing methane from a combustion exhaust gas containing sulfur oxide
Implementation Method 2
oxidatively removing methane from a combustion exhaust gas
Data Source
AI summary
The present invention relates to a methane combustion catalyst including platinum and iridium supported on a tin oxide carrier for combusting methane in a combustion exhaust gas containing sulfur oxide. In the methane combustion catalyst, a ratio RTO of platinum oxides to metal platinum is 8.00 or more, wherein the ratio RTO is based on existence percentages of the metal platinum (Pt) and the platinum oxides (PtO and PtO2) obtained from a platinum 4f spectrum analyzed and measured by X-ray photoelectron spectroscopy (XPS) and calculated in accordance with the following expression. In the following expression, RPt is an existence percentage of the metal platinum (Pt), RPto is an existence percentage of PtO, and RPto2 is an existence percentage of PtO2.RTO=(RPtO+RPtO2)/RPt [Expression 1]