Pyrochlore Catalyst for Ethanol Reforming Carbon Deposition
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Solution Overview
Problem
Current catalyst compositions for oxidative steam reforming of ethanol suffer from high energy conversion temperatures, carbon deposition, and reduced usable-life due to the adsorption of catalytic active components on traditional supports, leading to decreased activity and increased costs.
Innovation Solution
A catalyst composition with a pyrochlore structured supporter, such as A2B2O7, is developed, incorporating catalytic active components like metal solid solutions (M2-xM′x(CeyN2-y)O7-δ, P2(Q2-zRuz)O7, and La2(C2-μDμ)O7-1.5μ, which are prepared using sol-gel and impregnation methods to enhance stability and reduce carbon deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional supports (γ-Al2O3, SiO2, ZrO2, MgO, TiO2) are used for catalytic active components, then the catalyst can operate at high temperature, but carbon deposition increases and catalyst activity decreases
Solution Approach 1:
The patent changes the chemical composition parameters of the support material by introducing rare earth elements (La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) combined with metal oxides (Al2O3, SiO2, ZrO2, MgO, TiO2) to create a new support material that resists carbon deposition while maintaining high temperature stability
Solution Approach 2:
The patent creates a composite support material combining rare earth elements with traditional metal oxides. This composite structure leverages the high temperature stability of traditional supports while adding carbon resistance properties from rare earth elements, thereby reducing carbon deposition without sacrificing temperature tolerance
2Device complexity
If traditional supports are used, then the catalyst structure is simple, but catalyst activity is reduced due to carbon deposition
Solution Approach 1:
The patent modifies the chemical composition parameters of the support by incorporating rare earth elements in specific ratios (0.1-10 wt%), which fundamentally changes the surface properties and chemical environment of the catalyst, thereby maintaining high activity without excessive structural complexity
3Productivity
If noble metals are used as catalytic active components, then catalytic activity is high, but cost increases
Solution Approach 1:
The patent replaces expensive noble metals with base metals (Fe, Co, Ni, Cu, Mn, Zn, Ca, Sr, Ba) that are significantly cheaper. Although base metals generally have lower intrinsic activity than noble metals, the optimized support material compensates for this deficiency, achieving acceptable catalytic activity at much lower cost
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 composition achieves high ethanol conversion rates and hydrogen selectivity over prolonged periods, maintaining stability and reducing carbon deposition, thus extending the catalyst's usable-life and improving energy conversion efficiency.
Implementation Method 1
these catalytic active components adsorb on normal supporters like γ-Al2O3, SiO2, ZrO2, MgO and TiO2
Implementation Method 2
oxidative steam reforming of ethanol (OSRE) and others. Over the past decade, scientists have focused on the research that SRE can be operated at lower temperature
Data Source
AI summary
The present invention provides a catalyst composition for producing hydrogen and preparation method and use thereof, wherein the catalyst composition comprises a catalytic component and a supporter having a pyrochlore structure. By using the catalyst composition of the present invention, carbon deposition can be reduced and the oxidative steam reforming of ethanol could be operated for a long period of time with high ethanol conversion rate and selectivity of hydrogen.