Antimony Promoted Vanadium Catalyst Production via Composite Oxide
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Solution Overview
Problem
The production of antimony promoted vanadium catalysts for NOx abatement poses environmental and health risks due to the volatility and dust formation of Sb2O3 at high temperatures, leading to unsatisfactory NOx conversion performance in existing methods.
Innovation Solution
A method involving the formation of a mixture comprising a TiO2-based support and a composite oxide containing vanadium and antimony, followed by drying and calcination in a controlled oxygen-containing atmosphere, to produce antimony promoted vanadium catalysts without releasing hazardous substances into the air, thereby minimizing environmental and health risks while maintaining effective NOx conversion performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Sb2O3 is used as promoter in conventional slurry preparation and coating processes, then catalyst performance is improved, but environmental and health risks increase due to volatility and dust formation at high temperatures
Solution Approach 1:
The patent applies preliminary action by pre-forming a composite oxide containing vanadium and antimony in a separate process before slurry preparation. This composite oxide is then mixed with the support in a dry state, preventing Sb2O3 from being present as a volatile substance during slurry preparation and coating operations, thereby eliminating environmental and health risks while maintaining catalyst performance
Solution Approach 2:
The patent introduces a composite oxide as an intermediary substance that combines vanadium and antimony in a stable form. This composite oxide serves as a mediator that delivers the necessary catalytic properties without the harmful volatility and dust formation characteristics of pure Sb2O3, resolving the contradiction between performance and safety
2Object-generated harmful factors
If Sb2O3 is present during slurry preparation and coating operations, then promoter function is achieved, but NOx conversion performance becomes unsatisfactory due to hazardous substance release
Solution Approach 1:
The patent performs preliminary formation of the composite oxide containing vanadium and antimony before the slurry preparation step. This ensures that the promoter components are already combined in a stable, non-volatile form, preventing hazardous substance release during subsequent operations while ensuring the catalyst maintains effective NOx conversion performance
Solution Approach 2:
The patent changes the physical and chemical parameters of the promoter by transforming it from pure Sb2O3 to a composite oxide structure. This parameter change eliminates the volatility and dust formation issues of Sb2O3 while preserving the catalytic activity needed for effective NOx conversion
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 effectively reduces environmental and health risks during catalyst production while achieving desirable NOx abatement performance, with enhanced NOx conversion efficiency, especially at low temperatures, as demonstrated by the comparative SCR performance tests.
Implementation Method 1
a method for production of antimony promoted vanadium catalysts for selective catalytic reduction (SCR)... the antimony promoted vanadium catalysts obtained/obtainable from the method, and use of the catalysts for abatement of nitrogen oxides (NOx)
Implementation Method 2
providing a mixture comprising a TiO2-based support and a composite oxide containing vanadium and antimony
Data Source
AI summary
A method for production of vanadium catalysts, including steps of 1) providing a mixture comprising a TiO2-based support and a composite oxide containing vanadium and antimony; 2) preparing a slurry containing the mixture obtained from step 1), and additive comprising at least one species selected from the group consisting of Si, Al, Zr, Ti, W and Mo, and a solvent; and 3) applying the slurry onto a substrate or processing the slurry into shaped bodies. The vanadium catalysts obtained/obtainable from the method, and use thereof for abatement of nitrogen oxides (NOx).