Ru-Sn Catalyst Flow Reactor for Hydrogen Production
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Solution Overview
Problem
Current methods for producing hydrogen and carboxylic acid from ethanol require long reaction times, complex catalyst recovery processes, and result in low yields and impurities, with high energy consumption due to elevated temperatures and the use of expensive precious metal catalysts.
Innovation Solution
A method using a flow reactor with a solid catalyst alloy of ruthenium and tin (Ru—Sn) on a support, operating at temperatures between 185° C. and 350° C. and pressures of 0.1 to 15 MPa, to react ethanol with water, reducing reaction time to 60 seconds or less and improving yield and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional batch reaction methods are used with organic-iridium complexes, then hydrogen and carbonyl compounds can be produced, but the reaction time is excessively long (at least 18 hours)
Solution Approach 1:
The invention changes the physical state parameter of water from liquid to gas phase by heating to boiling point, which dramatically accelerates the reaction rate. The gaseous water molecules have higher kinetic energy and react more rapidly with ethanol on the catalyst surface, reducing reaction time from 18+ hours to just a few hours while maintaining high productivity.
Solution Approach 2:
The invention employs a flow reaction system where reactants continuously pass through the catalyst bed, enabling continuous production rather than batch processing. This continuous flow method maintains optimal reaction conditions throughout the process, maximizing productivity and eliminating idle time between batches.
2Ease of manufacture
If vacuum drying and extraction methods are used for catalyst recovery, then the catalyst can be separated from the reaction mixture, but the process becomes complex and time-consuming
Solution Approach 1:
The flow reaction system allows for continuous catalyst separation through filtration as the reaction mixture exits the reactor. The catalyst is continuously filtered from the product stream without interrupting the reaction process, eliminating the need for batch-wise vacuum drying and extraction operations.
Solution Approach 2:
The invention simplifies catalyst recovery by directly filtering the catalyst from the reaction mixture in a continuous manner, taking out only the essential separation step while eliminating complex vacuum drying and organic solvent extraction procedures. This approach maintains ease of manufacture while reducing process complexity.
3Manufacturing precision
If expensive precious metal catalysts like organo-iridium complexes are used, then high selectivity can be achieved, but the production cost increases significantly
Solution Approach 1:
The invention replaces expensive precious metal catalysts with cheaper transition metal catalysts (Ni, Co, Fe, Mn, Cu, Zn, or their combinations) that can be used in flow reaction systems. While individual catalyst lifetimes may be shorter, the continuous flow nature of the system allows for easy catalyst replacement, achieving cost-effective production with maintained selectivity.
Solution Approach 2:
The invention changes the reaction condition parameters, specifically using gaseous water at elevated temperatures (boiling point) in a flow system, which enhances the performance of cheaper catalysts. This parameter change compensates for the lower intrinsic activity of non-precious metals, maintaining high selectivity while reducing catalyst cost.
4Productivity
If high temperatures are used to achieve gaseous state of water, then reaction rate increases, but energy consumption increases
Solution Approach 1:
The invention utilizes the phase transition of water from liquid to gas at its boiling point as the key reaction condition. This phase transition provides a natural temperature threshold (100°C at atmospheric pressure) that is sufficient to achieve high reaction rates without requiring excessive heating. The gaseous state of water dramatically increases reaction rate while the temperature requirement remains moderate, balancing productivity with energy consumption.
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
This method significantly shortens reaction time, enhances the yield and purity of hydrogen and carboxylic acid production, and offers stable and durable catalyst reuse with reduced energy consumption and lower costs.
Implementation Method 1
reacting a primary alcohol with water by continuously introducing a primary alcohol of 1 to 7 carbon atoms and water into a flow reactor packed with a solid catalyst consisting of an alloy of ruthenium and tin (Ru—Sn alloy) on a support
Implementation Method 2
passing the alcohol and water through the flow reactor under temperature and pressure conditions at which the water assumes a gaseous state
Data Source
AI summary
In a method for producing hydrogen and carboxylic acid, a primary alcohol of 1 to 7 carbon atoms and water are reacted by being continuously introduced into a flow reactor packed with a solid catalyst consisting of an alloy of ruthenium and tin on a support and passed through the reactor under temperature and pressure conditions at which the water assumes a gaseous state. This method enables hydrogen and carboxylic acid to be produced in a high yield or at a high purity from a primary alcohol and water in a short time and by simple operations.