Rare-Earth Zinc Aluminate Catalyst for Stable Propane Dehydrogenation
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Solution Overview
Problem
Existing Pt-based catalysts for propane dehydrogenation suffer from poor stability, high carbon deposition, and low resistance to sintering, limiting their performance and efficiency in propylene production.
Innovation Solution
A light alkane dehydrogenation catalyst using a modified zinc aluminate carrier with rare earth elements and precious metals, along with transition metal promoters, to enhance stability and regulate the valence state of active components, reducing carbon deposition and improving catalytic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Pt-based catalysts are used for propane dehydrogenation, then reactivity and selectivity to propylene are improved, but stability deteriorates due to sintering and carbon deposition
Solution Approach 1:
The patent uses a composite catalyst system consisting of Pt active component, Ga promoter, and zinc aluminate carrier with rare earth elements. This composite structure combines the high reactivity of Pt with the stability and carbon resistance provided by the zinc aluminate-rare earth composite carrier, resolving the contradiction between reactivity and stability
Solution Approach 2:
The zinc aluminate carrier modified with rare earth elements acts as an intermediary between the Pt active component and the reaction environment. It protects Pt from sintering and carbon deposition while maintaining its catalytic activity, thus improving stability without sacrificing reactivity
2Power
If Pt particles are used at high temperatures, then dehydrogenation activity is improved, but resistance to sintering deteriorates
Solution Approach 1:
The rare earth elements are incorporated into the zinc aluminate carrier structure to create local regions with enhanced thermal stability and oxygen storage capacity. These local modifications protect Pt particles from sintering at high temperatures while maintaining overall catalytic activity
Solution Approach 2:
The patent modifies the physical and chemical parameters of the carrier by incorporating rare earth elements, which changes the thermal stability and structural properties of the carrier. This allows the catalyst to maintain Pt particle dispersion and resistance to sintering even at high reaction temperatures
3Device complexity
If traditional zinc aluminate carrier is used, then catalyst structure is simple, but catalytic activity and selectivity are low
Solution Approach 1:
The patent creates a composite zinc aluminate-rare earth carrier system that combines the simplicity and cost-effectiveness of traditional zinc aluminate with the enhanced catalytic properties provided by rare earth elements. This composite structure improves catalytic activity and selectivity while maintaining relative structural simplicity
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 high propane conversion rate, high selectivity to propylene, and strong resistance to sintering, offering superior catalytic performance and stability compared to traditional catalysts.
Implementation Method 1
the modified zinc aluminate carrier with rare earth elements and precious metals, along with transition metal promoters, to enhance stability and regulate the valence state of active components
Implementation Method 2
Propane direct dehydrogenation is one of the oriented production processes for propylene in industry
Data Source
AI summary
The present invention provides a light alkane dehydrogenation catalyst, and a preparation method and application thereof, and belongs to the technical field of petrochemical technology. The catalyst uses at least one of precious metals Pt, Pd, Ru and Rh as an active component, at least one of transition metals Ga, V, In, Sn, Mn, Ce, Fe and Ni as a promoter, and a modified zinc aluminate carrier as a carrier; the chemical composition of the modified zinc aluminate carrier is of the general formula ZnMxAlyO4, where x is 0.01-0.99, y is 0.01-1.99, and it satisfies x+y=2; M is selected from at least one of the rare earth elements La, Ce, Pr, Sm and Er. The catalyst prepared by such a modified zinc aluminate carrier has the characteristics of high propane conversion rate, high selectivity for product propylene, strong resistance to sintering, good stability, etc.