Ni-Co Bimetallic Catalyst Structure for Sintering-Resistant Methane Reforming
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Solution Overview
Problem
Current bifunctional catalysts for dry reforming of methane suffer from low reforming efficiency, poor stability due to sintering and carbon deposition, and high costs associated with noble metal-based catalysts, limiting their industrial applicability.
Innovation Solution
A Ni—Co bimetallic catalyst is prepared through a method involving alkaline earth metal salts, tannin, nickel and cobalt salts, and EDTA, with a calcination process to create a porous structure that resists sintering and carbon deposition, enhancing activity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If noble metal based catalysts are used, then high activity and good stability are achieved, but high cost and scarcity of resources occur
Solution Approach 1:
The patent replaces expensive noble metals with inexpensive non-noble metals (Ni and Co) to create a cost-effective catalyst system that achieves comparable performance without relying on scarce resources
Solution Approach 2:
The patent creates a composite Ni-Co bimetallic catalyst with optimized composition ratios (Ni:Co = 1:1 to 1:2) that combines the advantages of both metals to achieve high activity and stability while reducing dependence on any single expensive metal
2Productivity
If Ni-based catalysts are used, then optimal activity is achieved, but sintering and carbon deposition occur leading to short catalyst life
Solution Approach 1:
The patent introduces Co metal particles dispersed throughout the Ni catalyst structure, creating localized regions with different catalytic properties that collectively resist sintering and carbon deposition while maintaining high reforming activity
Solution Approach 2:
The Ni-Co bimetallic composite structure leverages the synergistic effect between Ni and Co metals, where Co modifies the catalytic behavior of Ni to reduce deactivation mechanisms while preserving optimal activity for methane reforming
3Adaptability or versatility
If bifunctional catalysts with adsorbents are prepared, then CO2 capture and reaction promotion occur, but low specific surface area and poor stability after multiple cycles are observed
Solution Approach 1:
The patent employs porous carrier materials with controlled pore structures (such as alumina or silica) to provide high specific surface area for CO2 adsorption and catalytic reactions, while the porous structure itself maintains stability through multiple reaction cycles
Solution Approach 2:
The patent introduces a stable carrier material as an intermediary that supports the Ni-Co catalyst particles and provides CO2 adsorption sites, separating the catalytic function from the adsorption function while maintaining overall system stability
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 Ni—Co bimetallic catalyst exhibits high conversion efficiency and stable performance, with improved resistance to sintering and carbon deposition, offering a cost-effective solution for large-scale industrial applications.
Implementation Method 1
alkaline earth metal salt and tannin are mixed by ball milling to obtain a first mixture, and the first mixture is calcined to obtain a promoter MOx
Implementation Method 2
the first mixture is calcined to obtain a promoter MOx
Implementation Method 3
nickel salt, cobalt salt, ethylene diamine tetraacetic acid (EDTA) and water are mixed to obtain a second mixture, aqueous ammonia is dripped into the second mixture to obtain a homogeneous solution
Implementation Method 4
ultrasonic dispersion is performed on the mixed solution obtained in the step (2) to obtain a dispersed solution
Implementation Method 5
the precursor obtained in step (3) and an anchoring agent melamine are ground evenly according to a certain ratio to obtain a ground mixture, the ground mixture is calcined under inert atmosphere to obtain the Ni—Co bimetallic catalyst
Implementation Method 6
The disclosure provides a preparation method of a Ni—Co bimetallic catalyst, which produces a porous structure catalyst with high specific surface area, and the porous structure catalyst successfully solves the problems of catalyst sintering and carbon deposition, and greatly improves the activity and stability of the catalyst
Implementation Method 7
the porous structure catalyst successfully solves the problems of catalyst sintering and carbon deposition, and greatly improves the activity and stability of the catalyst
Data Source
AI summary
A preparation method and an application method of a Ni—Co bimetallic catalyst for dry reforming of methane are provided, which relate to the field of catalytic material preparation technologies. The preparation method uses Ni and Co as active components of a catalyst for dry reforming of methane, alkaline earth metal salt as CO2 adsorbent, and uses an immersion method to prepare a Ni—Co bimetallic catalyst with high performance. The prepared catalyst not only effectively overcomes a problem of poor stability of Ni-based catalysts, but also promotes the adsorption of CO2 and improves the efficiency of dry reforming of methane. The preparation method of the Ni—Co bimetallic catalyst is simple and cost-effective, and exhibits excellent catalytic performance and stability in dry reforming reaction of methane.