Perovskite–Complex Oxide Catalysts for Heat-Resistant Dehydrogenation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dehydrogenation reaction catalysts, including those used in methane oxidative coupling, suffer from issues of heat resistance, catalytic activity, and activity at low temperatures, leading to catalyst deactivation during exothermic reactions in large-scale production facilities.
Innovation Solution
A dehydrogenation reaction catalyst comprising a perovskite-type oxide with a specific composition and a secondary phase of complex oxides, enhancing heat resistance and catalytic activity through a structured design that promotes oxygen adsorption and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dehydrogenation reaction is promoted at high temperature, then reaction rate increases, but catalyst deactivation occurs due to steep temperature rise from exothermic reaction
Solution Approach 1:
The patent modifies the chemical composition parameters of the catalyst by incorporating specific ratios of perovskite-type oxide (0.1-0.8) and complex oxide (0.2-0.9), along with controlled oxygen deficiency (0.05-0.5), to optimize both reaction activity and thermal stability. This compositional parameter adjustment allows the catalyst to maintain high dehydrogenation activity while resisting deactivation under exothermic reaction conditions.
Solution Approach 2:
The patent creates a composite catalyst system combining perovskite-type oxide and complex oxide in specific proportions. This composite structure synergistically combines the high catalytic activity of perovskite with the enhanced heat resistance and structural stability of complex oxide, enabling the catalyst to withstand temperature fluctuations from exothermic reactions while maintaining productivity.
2Reliability
If catalyst heat resistance is enhanced through conventional methods, then stability improves, but catalytic activity particularly at low temperature deteriorates
Solution Approach 1:
The patent optimizes the oxygen deficiency parameter (δ = 0.05-0.5) in the perovskite-type oxide component, which simultaneously enhances heat resistance by stabilizing the crystal structure at high temperatures and maintains catalytic activity by preserving active oxygen sites necessary for low-temperature dehydrogenation reactions.
Solution Approach 2:
The composite structure of perovskite-type oxide and complex oxide creates a synergistic effect where the complex oxide provides thermal stability and heat resistance, while the perovskite-type oxide maintains catalytic active sites that function effectively at lower temperatures, thus resolving the trade-off between heat resistance and catalytic activity.
3Ease of manufacture
If catalyst composition is simplified for ease of manufacture, then production cost decreases, but catalytic performance and heat resistance deteriorate
Solution Approach 1:
The patent defines specific compositional ranges (perovskite-type oxide 0.1-0.8, complex oxide 0.2-0.9, oxygen deficiency 0.05-0.5) that balance manufacturing feasibility with performance requirements. These parameter specifications enable standardized production processes while ensuring the catalyst achieves the necessary heat resistance and catalytic activity for industrial dehydrogenation applications.
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 exhibits improved heat resistance and catalytic activity, particularly at low temperatures, effectively promoting dehydrogenation reactions such as methane oxidative coupling, while maintaining stability under high-temperature conditions.
Implementation Method 1
a technique of enhancing a catalytic activity of a dehydrogenation reaction catalyst, particularly a catalytic activity for enhancing dehydrogenation reaction at low temperature
Implementation Method 2
a structured design that promotes oxygen adsorption and conductivity
Implementation Method 3
Methane oxidative coupling reaction is an exothermic reaction. Thus, as the reaction proceeds, the temperature of the catalyst may steeply rise
Data Source
Figure 1
Figure 2
Figure 3
AI summary
This dehydrogenation reaction catalyst comprises: a main phase configured from a perovskite oxide expressed by general formula (A1-xA'x)(Zr1-y-zByB'z)O3-δ (where A is at least one element selected from alkali earth metals, A' is at least one element from among La and Y, B is at least one element from among Ti and Ce, B' is at least one element from among Y, Sc, Yb, Al, In, and Nd, 0 ≤ x ≤0.4,0.3 ≤ (1 - z) ≤ 1, 0 ≤ y, 0 < (1 - y - z), and δ represents an oxygen deficit); and an auxiliary phase configured from at least one from among three composite oxides expressed by general formula AB'2O4, A2B'2O5, or A3B'4O9.