Palladium-Cerium Oxide Catalyst for Methane Partial Oxidation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The high-temperature pyrolysis of methane using chlorine results in poor selectivity control, leading to the production of unwanted byproducts such as methylene chloride and coke, due to its dependence on heat and reaction time.
Innovation Solution
A partial oxidation process of hydrocarbons involving an inlet gas of hydrocarbon raw material and hydrogen chloride gas, with a catalyst comprising palladium supported on cerium oxide, which maintains catalyst activity and suppresses byproduct formation by transitioning into a Pd/CeOCl structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-temperature pyrolysis of methane using chlorine is used, then methane conversion is achieved, but selectivity control deteriorates leading to byproduct formation
Solution Approach 1:
The invention changes the reaction parameters from high-temperature pyrolysis to low-temperature partial oxidation (200-400°C). By changing the temperature parameter and reaction type, the process achieves high methane conversion while maintaining good selectivity control, avoiding the byproduct formation issues of high-temperature pyrolysis
Solution Approach 2:
The invention introduces a catalyst (Pd-based catalyst supported on ceramic foam) as an intermediary to mediate the reaction. The catalyst enables selective partial oxidation of methane to synthesis gas at low temperatures, resolving the contradiction between conversion and selectivity by providing an alternative reaction pathway with lower activation energy and better control
2Productivity
If high-temperature pyrolysis is used, then methane conversion is achieved, but harmful byproducts such as coke are generated
Solution Approach 1:
By changing the temperature parameter from high-temperature pyrolysis to low-temperature partial oxidation (200-400°C), the invention suppresses coke formation while maintaining methane conversion. The lower temperature prevents the side reactions that lead to coke and other harmful byproducts
Solution Approach 2:
The invention uses oxygen as a strong oxidant to enable partial oxidation of methane at low temperatures. This accelerated oxidation pathway, facilitated by the Pd catalyst, converts methane to synthesis gas without requiring high temperatures, thereby avoiding coke generation
3Manufacturing precision
If low temperature partial oxidation is used, then byproduct formation is minimized, but reaction rate decreases
Solution Approach 1:
The Pd-based catalyst supported on ceramic foam acts as an intermediary that accelerates the partial oxidation reaction at low temperatures. The catalyst provides active sites that lower the activation energy, maintaining a high reaction rate while enabling selective conversion and minimizing byproduct formation
Solution Approach 2:
The invention uses ceramic foam as a support structure for the catalyst. The porous structure of the ceramic foam increases the surface area and provides channels for reactant diffusion, enhancing the reaction rate at low temperatures while maintaining good selectivity control
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
This process achieves high conversion and yield of carbon monoxide while minimizing coke production and reducing carbon dioxide formation, even at low temperatures, with the catalyst maintaining activity over time.
Implementation Method 1
bringing an inlet gas comprising a hydrocarbon raw material gas and a hydrogen chloride gas into contact with a catalyst, in which the catalyst is a catalyst in which a catalyst material comprising palladium (Pd) is supported on a carrier comprising cerium oxide (CeO2)
Implementation Method 2
a catalyst in which a catalyst material comprising palladium (Pd) is supported on a carrier comprising cerium oxide (CeO2)... transitioning into a Pd/CeOCl structure
Data Source
AI summary
A partial oxidation process of hydrocarbons is provided, including bringing an inlet gas into contact with a catalyst, the inlet gas including a hydrocarbon raw material gas and a hydrogen chloride gas, wherein the catalyst includes a catalyst material including palladium (Pd), which catalyst material is supported on a carrier including cerium oxide (CeO2) and an amount of catalyst material supported on the carrier is 2 wt % to 10 wt % based on a total weight of the catalyst.