Zirconium Nickel Catalyst Doping for Amine Selectivity
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Solution Overview
Problem
Existing catalysts for the hydrogenative amination of aldehydes or ketones and amination of alcohols suffer from increased decarbonylation at elevated temperatures, leading to undesirable by-products like methane and toxic methoxyethanol, which complicates product separation and quality control.
Innovation Solution
A zirconium dioxide and nickel-containing catalyst with specific compositions, including oxygen-containing compounds of zirconium, nickel, iron, and additional doping elements like tin, lead, bismuth, molybdenum, antimony, and phosphorus, is used to reduce decarbonylation and enhance selectivity, stability, and yield in the amination process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If elevated temperatures are used to increase reaction rate, then productivity is improved, but decarbonylation increases leading to harmful by-products
Solution Approach 1:
The patent changes the chemical composition parameters of the catalyst by adding specific dopants (Fe, Sn, Pb, Bi, Mo, Sb, P) to modify the catalytic properties. This allows the catalyst to maintain high activity at lower temperatures, thereby increasing productivity while suppressing decarbonylation reactions that produce harmful by-products.
Solution Approach 2:
The patent uses composite catalyst materials combining ZrO2 with Ni and multiple dopants (Fe, Sn, Pb, Bi, Mo, Sb, P). This composite structure creates synergistic effects where the dopants modify the electronic and structural properties of the catalyst, enabling selective catalysis that favors amination over decarbonylation even at elevated temperatures.
2Productivity
If catalyst activity is increased to improve productivity, then production efficiency is improved, but selectivity decreases leading to more by-products
Solution Approach 1:
The patent introduces dopants with specific local electronic and structural properties that create distinct active sites on the catalyst surface. Different dopants (Fe, Sn, Pb, Bi, Mo, Sb, P) provide localized modifications that enhance amination activity while suppressing decarbonylation, thereby improving both productivity and selectivity simultaneously.
Solution Approach 2:
The patent optimizes the composition parameters of the catalyst by controlling the content of each component (ZrO2, Ni, and dopants at 0.1-5.0 wt%). This precise parameter control allows tuning of the catalyst's electronic structure and surface properties to achieve high activity with maintained selectivity.
3Duration of action of stationary object
If catalyst service life is extended to reduce replacement frequency, then operational stability is improved, but activity may decrease over time
Solution Approach 1:
The patent incorporates dopants that provide structural stabilization to the catalyst framework before deactivation can occur. These dopants (particularly Fe, Sn, and Mo) strengthen the catalyst structure and prevent sintering and degradation, cushioning against activity loss over time and extending service life while maintaining reliability.
Solution Approach 2:
The composite catalyst structure with multiple dopants creates a more robust and stable material. The interactions between different dopant elements and the ZrO2-Ni matrix provide structural reinforcement and electronic stabilization, preventing catalyst deactivation mechanisms and maintaining consistent activity over extended service periods.
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 catalysts exhibit improved mechanical stability, high activity, and increased selectivity, reducing undesirable by-products and enhancing the production of desired amines like aminodiglycol and morpholine, while maintaining economic viability.
Implementation Method 1
The formation of methane through the hydrogenation of carbon monoxide (CO)
Implementation Method 2
there can be increased decarbonylation of the starting materials (alcohols, aldehydes, ketones) at elevated temperatures
Data Source
AI summary
The invention relates to a method for producing an amine by reacting a primary or secondary alcohol, aldehyde and/or ketone with hydrogen and a nitrogen compound, selected from the group including ammonia, primary and secondary amines, in the presence of a zirconium dioxide-containing and nickel-containing catalyst, the catalytically active mass of the catalyst prior to its reduction with hydrogen containing oxygen-containing compounds of zirconium, nickel and iron and 0.2 to 5.5% by weight of oxygen-containing compounds of tin, lead, bismuth, molybdenum, antimony and/or phosphorous, each calculated as SnO, PbO, Bi2O3, MoO3, Sb2O3 or H3PO4. The invention also relates to catalysts of the above type.