Dysprosium-Praseodymium Oxide Catalyst Support
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Solution Overview
Problem
Current catalyst supports for ammonia synthesis and degradation reactions, such as those using praseodymium oxide alone, face limitations in catalytic activity and stability, necessitating the development of more active and stable supports.
Innovation Solution
Catalyst supports comprising dysprosium and praseodymium oxides, synthesized via co-precipitation of their salts, offer enhanced activity and stability for ammonia synthesis and decomposition reactions by incorporating varying ratios of praseodymium and dysprosium oxides, surpassing traditional supports like alumina and silica.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional catalyst supports (silica, alumina, magnesia) are used, then the support provides physical and thermal stability, but the catalytic activity is limited
Solution Approach 1:
The patent employs composite oxide supports comprising multiple metal oxides (e.g., CeO2-ZrO2, CeO2-La2O3, PrO2-Dy2O3) to achieve synergistic effects that enhance catalytic activity beyond what single oxide supports can provide, while maintaining structural stability
2Reliability
If praseodymium oxide alone is used as support, then the catalytic activity is improved, but the stability is insufficient
Solution Approach 1:
The patent combines praseodymium oxide with dysprosium oxide in specific ratios (e.g., 90:10, 80:20, 70:30) to merge the high catalytic activity of PrO2 with the enhanced stability of Dy2O3, achieving both improved activity and stability simultaneously
Solution Approach 2:
The patent optimizes the compositional parameters of the mixed oxide supports by varying the ratios of different metal oxides and controlling calcination conditions to achieve optimal balance between catalytic activity and structural stability
3Reliability
If conventional supported catalysts are used for ammonia synthesis, then the catalyst can be recycled, but the activity and stability are insufficient
Solution Approach 1:
The patent modifies the support composition parameters by incorporating specific ratios of CeO2, ZrO2, La2O3, PrO2, and Dy2O3, and optimizes calcination temperature and atmosphere parameters to enhance both initial activity and long-term stability of the catalyst for ammonia synthesis and degradation 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 mixed metal oxide supports demonstrate significantly higher activity and stability for ammonia synthesis and decomposition, with optimal results achieved using a 80 wt % praseodymium oxide and 20 wt % dysprosium oxide combination, outperforming single metal oxide supports and traditional catalysts.
Implementation Method 1
The support serves to disperse the catalytically active material uniformly over a very large and reactant-accessible surface area
Implementation Method 2
In the co-precipitation method, the catalytically active material and the support (or precursors of both) are dissolved in a homogeneous solution and precipitated simultaneously (for example, by acid or base addition or evaporation of the solvent)
Implementation Method 3
the catalytically active material and the support precipitate together
Implementation Method 4
The solution is removed and the resulting material is then activated (chemically and/or thermally) under conditions that convert the pre-catalyst to an active state
Data Source
AI summary
A catalyst support containing praseodymium oxide and dysprosium oxide, supported catalysts using the support, and methods of using the supported catalysts to catalyze the formation and degradation of ammonia.