Ru-Alkali Alumina Catalyst with Low NH3 Desorption for BAC Selectivity
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Solution Overview
Problem
Existing catalysts for producing bis(aminomethyl)cyclohexane (BAC) have limitations in selectivity and yield, necessitating improvements for higher performance.
Innovation Solution
A catalyst with specific physical properties, including a desorption peak of 0.020 mmol/g-cat or less, comprising Ru and an alkali metal like Na, K, or Li, supported on alumina, produced through a method involving reaction, addition of alkali metal, and reduction, enhances BAC selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a catalyst with alkali metal modifier is used to improve selectivity, then BAC selectivity is improved, but the catalyst performance is still insufficient due to demanding higher performance requirements
Solution Approach 1:
The invention changes the physical parameters of the catalyst by controlling the desorption peak amount to 0.020 mmol/g-cat or less through specific preparation conditions, thereby achieving both high selectivity and sufficient performance
Solution Approach 2:
The invention modifies the local properties of the catalyst surface by controlling ammonia desorption characteristics, creating specific active sites that achieve both high selectivity and performance requirements
2Power
If catalyst active sites react strongly with ammonia, then hydrogenation ability is enhanced, but impurities are generated reducing BAC selectivity
Solution Approach 1:
The invention converts the harmful strong interaction between catalyst active sites and ammonia into a beneficial controlled interaction by precisely controlling the desorption peak amount, allowing sufficient hydrogenation ability while minimizing impurity generation
Solution Approach 2:
The invention changes the interaction parameter between catalyst active sites and ammonia by controlling the desorption peak amount to 0.020 mmol/g-cat or less, achieving the optimal balance between hydrogenation ability and selectivity
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 excellent BAC selectivity and yield, suppressing impurities by reducing active sites that react strongly with ammonia, thereby improving reaction efficiency.
Implementation Method 1
BAC can be obtained by, for example, the catalytic hydrogenation of xylylenediamine
Implementation Method 2
a catalyst for producing bis(aminomethyl)cyclohexane, the catalyst having hydrogenation ability
Implementation Method 3
an amount at a desorption peak measured for the catalyst by the following ammonia temperature-programmed desorption method
Implementation Method 4
followed by the detection of the desorption peak with a thermal conductivity detector
Data Source
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AI summary
Provided is a catalyst for producing bis(aminomethyl)cyclohexane, the catalyst having hydrogenation ability, wherein an amount at a desorption peak measured for the catalyst by the following ammonia temperature-programmed desorption method is 0.020 mmol/g-cat or less: (ammonia temperature-programmed desorption method) He gas is brought into contact with 150 mg of the catalyst at 500°C at a gas flow rate of 20 sccm for 30 minutes; subsequently, a mixed gas of 5% by volume of NH3 and balance He is brought into contact with the catalyst at 50°C at a gas flow rate of 20 sccm for 10 minutes; and then, while He gas is brought into contact with the catalyst at a gas flow rate of 20 sccm, the temperature is increased at 10°C/min, followed by the detection of the desorption peak with a thermal conductivity detector.