Vanadium-TiO2 Sorbent for Mercury Removal
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Solution Overview
Problem
Existing adsorbents have low capacity and are easily deactivated by sulfur oxides when removing heavy metals like mercury from flue gas streams, necessitating a material with high mercury retention capacity and resistance to deactivation.
Innovation Solution
A vanadium incorporated TiO2 sorbent material is prepared by impregnating vanadate ions onto a porous TiO2 support, followed by drying and calcination, which maintains vanadium in a +5 oxidation state for enhanced mercury sorption and oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adsorbents are used for mercury removal, then the process is simple, but the capacity is low and they are easily deactivated by sulfur oxides
Solution Approach 1:
The patent employs a composite material consisting of vanadium pentoxide (V2O5) supported on titanium dioxide (TiO2). This composite structure combines the high mercury oxidation capability of V2O5 with the stability and sulfur resistance of TiO2, achieving both high capacity and resistance to deactivation by sulfur oxides while maintaining reasonable compositional simplicity
Solution Approach 2:
The patent optimizes specific parameters including the vanadium content (0.1-10 wt%), calcination temperature (400-800°C), and particle size distribution. These parameter adjustments maximize the mercury sorption capacity while ensuring the material maintains structural integrity and resistance to sulfur oxide deactivation
2Reliability
If adsorbents are used to capture heavy metals, then removal is achieved, but the capacity is low and deactivation by sulfur oxides occurs easily
Solution Approach 1:
The patent utilizes vanadium pentoxide, a strong oxidizing agent, which actively oxidizes elemental mercury to mercury oxide. This oxidation process enhances the retention capacity as mercury oxide is nonvolatile and binds more strongly to the sorbent material, while the TiO2 support protects the vanadium from deactivation by sulfur oxides
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 vanadium incorporated TiO2 sorbent exhibits high capacity for mercury removal, achieving over 95% efficiency and maintaining activity even at high temperatures, effectively oxidizing mercury into stable compounds.
Implementation Method 1
the oxidation of the heavy metal to an oxidation state greater than zero
Implementation Method 2
incorporating a vanadium-containing compound with a porous support material
Data Source
AI summary
A sorbent composition comprising a vanadium compound and a TiO2 support material is disclosed. Methods of making and using the composition to remove heavy metals or heavy metal containing compounds from a fluid stream are also provided. Such methods are particularly useful in the removal of mercury and mercury compounds from flue gas streams produced from the combustion of hydrocarbon-containing materials such as coal and petroleum fuels.