Dehydrogenation Catalyst Acidity and Pt Ratio Control
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Solution Overview
Problem
Conventional dehydrogenation catalysts face issues with coke formation and reduced long-term stability due to high acidity levels and suboptimal platinum-to-assistant metal ratios, leading to decreased catalytic activity and process yield.
Innovation Solution
A dehydrogenation catalyst with a platinum-to-assistant metal molar ratio of 0.5 to 1.49 and controlled acidity between 20 to 150 μmol KOH/g, supported on a carrier with bimodal pore size distribution, reduces coke formation and enhances long-term performance by optimizing the interaction between platinum and assistant metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the acidity amount of the catalyst is high, then the catalytic activity is improved, but coke formation increases and long-term stability decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the acidity amount within 20-150 μmol KOH/g and the Pt to assistant metal molar ratio within 0.5-1.49. This optimization balances catalytic activity with resistance to coke formation, resolving the contradiction between high activity and low coke formation.
2Reliability
If the molar ratio of platinum to assistant metal is high, then catalytic activity is improved, but cost increases and selectivity decreases
Solution Approach 1:
The patent optimizes the molar ratio of platinum to assistant metal within 0.5-1.49, finding that lower ratios within this range improve process yield while maintaining catalytic activity. This parameter optimization resolves the contradiction between activity and productivity.
3Productivity
If the catalyst operates at high temperature, then dehydrogenation reaction rate is improved, but thermal decomposition and coke formation increase
Solution Approach 1:
The patent uses composite catalyst compositions combining platinum with assistant metals (Ga, In, Zn, Ge, Sn) and alkali/alkaline earth metals on alumina or silica-alumina supports. This composite structure enhances reaction rate while suppressing thermal decomposition and coke formation through synergistic effects.
4Duration of action of stationary object
If coke formation is reduced through lower acidity, then long-term stability is improved, but catalytic activity decreases
Solution Approach 1:
The patent identifies an optimal acidity range of 20-150 μmol KOH/g that simultaneously provides high catalytic activity and long-term stability with reduced coke formation. This parameter optimization resolves the contradiction between activity and 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 catalyst achieves higher hydrocarbon conversion, selectivity, and stability, allowing for reduced hydrogen/hydrocarbon ratios, thereby improving process yield and economy by minimizing coke formation and maintaining activity over time.
Implementation Method 1
The catalytic dehydrogenation of alkanes used to produce alkenes (olefin hydrocarbons) is an important and well-known hydrocarbon conversion process
Implementation Method 2
a catalyst support selected from silica, alumina, silica-alumina composites, rare earth modified alumina, and combinations thereof
Data Source
AI summary
The present invention relates to a dehydrogenation catalyst in which a platinum-group metal, an assistant metal, and an alkali metal or alkaline earth metal component are supported on a carrier, wherein the molar ratio of platinum to the assistant metal is 0.5 to 1.49, and the catalyst has an acidity amount of 20 to 150 μmol KOH/g catalyst when it is titrated with KOH. The dehydrogenation catalyst according to the present invention may prevent coke formation from increasing rapidly when the hydrogen/hydrocarbon ratio in a dehydrogenation reaction is reduced, thereby increasing the productivity of the process. Accordingly, it makes it possible to operate the process under a condition in which the hydrogen/hydrocarbon ratio in a dehydrogenation reaction is reduced, thereby improving the economy of the process.