Nitrogen Analysis Using Hydrogen Carrier Gas and Catalyst
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for determining nitrogen content, such as the Dumas method, face challenges with high maintenance and costs due to rapid consumption of reducing agents, requiring frequent replacement and manual intervention, which complicates the analysis process.
Innovation Solution
The method involves adding hydrogen to the measurement gas to reduce oxygen and nitrogen oxide components using a catalyst, with controlled parameters to convert these components into nitrogen and water, avoiding further reduction to ammonia, and using hydrogen as a carrier gas to simplify and cost-effectively maintain the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper or tungsten is used as reducing agent to convert nitrogen oxides to nitrogen, then nitrogen compounds are converted into nitrogen, but the reducing agent is consumed very quickly and requires frequent replacement, leading to large maintenance effort and high costs
Solution Approach 1:
The catalyst enables the reducing agent (hydrogen or carbon monoxide) to be continuously regenerated from the reaction products (water or carbon dioxide), creating a self-sustaining system that eliminates the need for frequent manual replacement of consumables and allows continuous operation without interruption
2Productivity
If copper or tungsten is used as reducing agent, then nitrogen oxides are reduced to nitrogen, but the process requires manual intervention and interruption for agent replacement, increasing complexity and cost
Solution Approach 1:
The catalyst automatically regenerates the reducing agent from reaction products, creating a closed-loop system that eliminates manual intervention and maintains continuous operation, thereby simplifying the overall process while improving productivity
Solution Approach 2:
The catalyst acts as an intermediary substance that facilitates the conversion of nitrogen oxides to nitrogen while simultaneously regenerating the reducing agent from oxidation products, enabling continuous operation without direct human intervention
3Productivity
If hydrogen is added to reduce oxygen and nitrogen oxide components, then continuous process flow is enabled, but excess hydrogen must be carefully managed to avoid further reduction to ammonia
Solution Approach 1:
The catalyst modifies the reaction parameters (temperature, activation energy) to selectively promote nitrogen oxide reduction to nitrogen while suppressing further reduction to ammonia, even in the presence of excess hydrogen, thereby maintaining measurement precision through controlled chemical transformation
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 approach enables a continuous, cost-effective, and reproducible nitrogen determination process with reduced maintenance, allowing for reliable control of gas components and precise nitrogen content measurement, while avoiding unnecessary complexity and expense.
Implementation Method 1
the reduction of the measurement gas takes place on a catalyst
Implementation Method 2
hydrogen is added to the measurement gas to reduce the oxygen and nitrogen oxide components
Implementation Method 3
the oxygen and nitrogen oxide components in the sample gas are converted to water and nitrogen
Implementation Method 4
hydrogen is added to the measurement gas to reduce the oxygen and nitrogen oxide components
Data Source
Figure 1
Figure 2
AI summary
In a method for determining a nitrogen concentration in solid or liquid samples, hydrogen (5) is used as a carrier gas and for reducing the oxygen and nitrogen oxide components in a combustion gas of the samples (1). After eliminating water (6) and other unwanted gas components (10), the nitrogen concentration in the carrier gas is determined using a thermal conductivity detector (9).