Catalyst Composition for Deoxidizing Unsaturated Hydrocarbon Gas
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Solution Overview
Problem
Current catalytic oxidation-deoxidation technologies are inadequate for unsaturated hydrocarbon-containing gases with high oxygen content, leading to carbon deposits on catalyst surfaces and requiring additional reducing gases like H2, which complicates the process and increases energy consumption.
Innovation Solution
A catalyst comprising a carrier with a specific distribution of active and co-agent components, including Pt, Pd, Ru, Rh, Ag, and Ir oxides, along with rare earth and alkali/alkaline earth metals, that allows unsaturated hydrocarbons to react directly with oxygen, reducing carbon deposits and eliminating the need for H2, while maintaining energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If catalytic combustion deoxygenation is used, then oxygen content is reduced, but carbon deposits form on catalyst surface and reducing gas must be added
Solution Approach 1:
The patent changes the chemical reaction parameters by using oxidation-deoxidation instead of combustion, operating at lower temperatures (200-400°C) and using different catalyst compositions (Pt, Pd, Ru, Rh, Ag, or Ir oxides with co-agent components) to achieve oxygen removal without carbon deposit formation
Solution Approach 2:
The patent converts the harmful oxygen that causes explosion risks into beneficial CO2 and H2O through controlled oxidation reactions, while simultaneously preventing the formation of carbon deposits by avoiding high-temperature combustion conditions
2Quantity of substance
If catalytic combustion deoxygenation is used, then oxygen content is reduced, but reducing gas addition is required
Solution Approach 1:
The patent extracts and removes the requirement for reducing gas from the deoxygenation process by using oxidation-deoxidation reactions that only require the unsaturated hydrocarbon-containing gas and oxygen, simplifying the overall process system
Solution Approach 2:
The unsaturated hydrocarbons in the feed gas serve as both the process material and the reducing agent, enabling the system to deoxygenate itself without requiring external reducing gas addition
3Quantity of substance
If catalytic combustion deoxygenation is used, then oxygen content is reduced, but energy consumption increases
Solution Approach 1:
The patent changes the thermal parameters by operating at lower temperatures (200-400°C) compared to high-temperature combustion, thereby reducing energy consumption while still achieving effective deoxygenation through catalytic oxidation-deoxidation reactions
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 effectively deoxidates unsaturated hydrocarbon-containing gases, suppressing carbon deposits and by-product CO production, and tolerates fluctuations in oxygen content, ensuring safe and efficient deoxygenation without the need for additional reducing gases.
Implementation Method 1
catalytic oxidation-deoxidation method for an unsaturated hydrocarbon-containing gas using the catalyst
Implementation Method 2
allows hydrocarbons to react directly with oxygen to produce CO2 and H2O
Data Source
AI summary
A catalyst for catalytic oxidation-deoxidation method of unsaturated hydrocarbon-containing gas has a carrier, an active component, a first co-agent component, and a second co-agent component loaded on the carrier respectively. The active component is one or more selected from the group consisting of oxides of Pt, Pd, Ru, Rh, Ag and Ir. The first co-agent component has one or more selected from the group consisting of a rare earth metal element, a group IVB metal element and a group VIII metal element; and the second co-agent component has one or more alkali metal element and alkaline earth metal element. The deoxidation method using the catalyst eliminates the need to add a reducing gas such as H2, allows hydrocarbons to react directly with oxygen to produce CO2 and H2O, achieves the goal of deoxidating a hydrocarbon-containing tail gas, and can prevent the generation of carbon deposits.