Titanium Dioxide Digestion Residue Catalyst for NOx Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current catalysts for nitrogen oxide reduction in exhaust gases, particularly those based on titanium dioxide, are economically costly and have limitations in activity and processability, necessitating the development of a more efficient and cost-effective catalyst support.
Innovation Solution
A composition comprising insoluble digestion residue from titanium dioxide production, combined with tungsten and/or vanadium compounds, which is mixed with binders and calcined to create a dimensionally stable catalytically active solid, suitable for use as a catalyst in nitrogen oxide reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If commercially available catalyst supports based on titanium dioxide are produced by precipitation reactions, hydrolysis, or flame pyrolysis, then the catalyst support shows good catalytic activity, but the production cost increases and process complexity increases
Solution Approach 1:
The invention recovers and utilizes the digestion residue (a waste byproduct) from titanium dioxide production to create catalyst supports. Instead of discarding this residue, it is processed into a valuable catalyst material containing titanium dioxide, tungsten, and vanadium compounds, thereby reducing production costs and eliminating waste disposal issues while maintaining catalytic activity for nitrogen oxide reduction
Solution Approach 2:
The invention changes the production parameters by using a different synthesis route (direct processing of digestion residue) compared to conventional methods (precipitation, hydrolysis, or flame pyrolysis). This parameter change simplifies the manufacturing process and reduces costs while producing catalyst supports with equivalent or superior catalytic performance
2Reliability
If conventional titanium dioxide catalyst supports are used, then catalytic activity is maintained, but the production process becomes more complex and less economically viable
Solution Approach 1:
The invention transforms a waste disposal problem into a resource recovery opportunity by converting digestion residue into catalyst supports. This approach eliminates the need for complex precipitation, hydrolysis, or flame pyrolysis processes, significantly simplifying the manufacturing workflow while producing functionally equivalent catalyst materials
Solution Approach 2:
The invention extracts valuable components (titanium dioxide, tungsten, and vanadium compounds) directly from the digestion residue through simplified processing steps, creating catalyst supports without requiring the complex multi-step conventional synthesis procedures
3Ease of manufacture
If digestion residue from titanium dioxide production is utilized, then production cost decreases and waste is reduced, but the catalytic activity and dimensional stability must be improved
Solution Approach 1:
The invention creates composite catalyst supports by combining digestion residue with specific amounts of tungsten compounds (1.0-10.0 wt%) and vanadium compounds (0.05-3.0 wt%). This composite approach enhances the catalytic activity and dimensional stability of the material while maintaining cost-effectiveness, as the added compounds work synergistically with the titanium dioxide in the residue to improve performance
4Ease of manufacture
If digestion residue is used as catalyst support, then economic viability improves, but the dimensional stability requires enhancement through binders and calcination
Solution Approach 1:
The invention uses binders (such as alumina, silica, or commercial binder materials) as intermediary substances to provide dimensional stability to the catalyst support structure. These binders act as a matrix that holds the digestion residue particles together, maintaining structural integrity during operation while allowing the active catalytic components to function effectively
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 resulting catalyst demonstrates high catalytic activity and efficiency in reducing nitrogen oxides across a wide temperature range, outperforming conventional catalysts in certain conditions while being more economically viable due to the use of readily available digestion residue.
Implementation Method 1
at least one further component which is catalytically active, as well as dimensionally stable, catalytically active solids which can be obtained from this composition and used as a catalyst, for example to reduce nitrogen oxides
Implementation Method 2
separating the solids contained in the digestion solution to obtain a digestion residue and a substantially solids-free digestion solution
Implementation Method 3
mixing the above-mentioned composition with binders, if necessary plasticizers and other additives, shaping the composition thus obtained, preferably by extrusion, and subsequent calcination
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a composition comprising titanium dioxide-containing digestion residue from titanium dioxide production, and at least one further component which is catalytically active, and also dimensionally stable, catalytically active solids which are obtained from this composition and can be used as catalyst, for example for minimizing nitrogen oxides.