Pressure Dilution Catalyst Preparation for Methane Reforming
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Solution Overview
Problem
Nickel catalysts used in dry reforming of methane face deactivation due to carbon formation, which is influenced by metal-support interactions, catalyst structure, and preparation methods, leading to reduced activity and stability.
Innovation Solution
A method involving the deposition of a metal precursor on a porous support like fumed silica or fumed metal oxides through wet impregnation, followed by drying, adding additional support to form a diluted powder, and pressing into pellets, known as pressure dilution, to create catalysts with improved stability and nickel dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If Ni catalysts are used for dry reforming of methane, then price competitiveness and ease of preparation are improved, but catalyst deactivation due to carbon formation occurs
Solution Approach 1:
The patent changes the physical and chemical parameters of the catalyst preparation process, specifically using wet impregnation with controlled drying to form a powder, then adding additional support and pressing at specific pressures (5-20 tons/cm²) to create a diluted powder with improved nickel dispersion and reduced carbon formation
Solution Approach 2:
The patent creates a composite catalyst structure by depositing metal precursor on porous support (fumed silica or fumed metal oxide) and then adding additional porous support to form a diluted powder, resulting in a composite material with optimized metal-support interactions that reduce carbon nanotube formation
2Reliability
If additional support is added and pressing is applied to form diluted powder, then nickel dispersion and stability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the catalyst preparation process into distinct steps: wet impregnation, drying to form powder, adding additional support, and pressing. This segmentation allows each step to be optimized independently, with the pressing step specifically controlling nickel dispersion and catalyst stability through controlled application of pressure
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 resulting catalysts exhibit increased stability and nickel dispersion, reducing carbon nanotube formation and entanglement, thus maintaining high activity over a longer period.
Implementation Method 1
depositing a metal precursor on a porous support by wet impregnation
Implementation Method 2
pressing the diluted powder to form pellets
Data Source
AI summary
Described is a method for the preparation of a reforming catalyst. The method comprises: (a) depositing a metal precursor on a porous support by wet impregnation, wherein the porous support is selected from the group consisting of a fumed silica, a fumed metal oxide, and combinations thereof; (b) drying the porous support after depositing the metal precursor to form a powder; (c) adding additional porous support to the powder to form a diluted powder; and (d) pressing the diluted powder to form pellets.