Composite Sorbent for Simultaneous SOx and NOx Removal
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Solution Overview
Problem
Current technologies are inadequate for simultaneously and effectively removing sulfur oxides and nitrogen oxides from flue gases, with existing sorbents having limited regeneration stability and efficiency in industrial waste gas purification.
Innovation Solution
A sorbent composition comprising a refractory inorganic oxide matrix, metal components I and II, with specific valence states of Cr, Mn, Co, or Zn, and other components, which are formulated to enhance adsorption and regeneration properties, allowing for efficient simultaneous removal of sulfur and nitrogen oxides from flue gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sorbents are used for removing SOx and NOx from flue gas, then some removal capability is achieved, but the regeneration stability and adsorption capacity are insufficient
Solution Approach 1:
The patent employs a composite sorbent material consisting of a refractory inorganic oxide matrix (such as γ-Al2O3, SiO2, or TiO2) combined with specific metal components (Na, K, Ba, Mg, Ca from Group IA/IIA and Cr, Mn, Co, Zn from Groups VIB-VIIB). This composite structure synergistically enhances both the regeneration stability provided by the refractory matrix and the adsorption capacity contributed by the metal components, resolving the contradiction between reliability and quantity of substance.
Solution Approach 2:
The patent optimizes specific parameters including the metal component content (0.5-35 wt%), refractory matrix specific surface area (130-300 m2/g), and metal oxide valence states (particularly Cr6+, Mn4+, Co3+, Zn2+). These parameter changes enhance the sorbent's regeneration stability while maintaining high adsorption capacity for both SOx and NOx removal.
2Quantity of substance
If existing catalysts are used for NOx removal, then catalytic reduction can be achieved, but the technology is complex and costly
Solution Approach 1:
The patent develops a multi-functional sorbent that can simultaneously remove both SOx and NOx from flue gas, eliminating the need for separate treatment systems. The sorbent performs adsorption, catalytic reduction, and regeneration functions within a single material system, thereby reducing device complexity and operational costs while maintaining high removal rates for both pollutants.
Solution Approach 2:
The patent implements a regenerable sorbent system where the sorbent can be regenerated after adsorbing SOx and NOx. This allows the sorbent to be reused multiple times, reducing the need for continuous replacement and simplifying the overall process compared to single-use catalysts, thereby reducing device complexity while maintaining effective NOx removal.
3Reliability
If multiple separate treatment processes are used for SOx and NOx removal, then each pollutant can be addressed, but the operation cost and process complexity increase
Solution Approach 1:
The patent merges the removal functions for SOx and NOx into a single sorbent material and a unified treatment process. The sorbent simultaneously adsorbs and catalytically reduces both types of pollutants, eliminating the need for separate treatment trains. This consolidation maintains reliable pollutant removal effectiveness while significantly reducing operation costs and simplifying operational procedures.
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 sorbent composition achieves superior adsorption and regeneration stability, significantly improving the removal of sulfur and nitrogen oxides, exceeding the performance of prior art sorbents in terms of capacity and efficiency, while maintaining effective regeneration properties.
Implementation Method 1
a sorbent composition... for removing sulfur oxides and nitrogen oxides in a flue gas... the sorbent composition achieves superior adsorption... the sorbent has not only a better property of removing sulfur and nitrogen substances
Implementation Method 2
the active component comprises alkaline metals, copper, noble metals, or the like... the metal component II in the sorbent is present in at least two different valence-states... the features of the catalyst mainly consist in introducing metal oxides... NO is catalystically reduced by means of the catalytic reduction property of the metal oxides
Implementation Method 3
the sorbent has not only a better property of removing sulfur and nitrogen substances, but also a better regeneration stability
Data Source
Figure 1
AI summary
The present invention relates to a sorbent composition, the preparation method thereof, and the process for removing sulfur oxides and nitrogen oxides in a flue gas by the sorbent composition. The sorbent composition comprises a refractory inorganic oxide matrix, metal component I and metal component II, wherein said refractory inorganic oxide matrix has a specific surface area of more than 130 m2/g, said metal component I is selected from one or more element(s) of group IA and group IIA in the Periodic Table of Elements, and said metal component II is selected from one or more transition metal(s) of group IIB, group VIB, group VIIB, and group VIII in the Periodic Table of Element, and wherein said metal component II is present in at least two different valence-states, as characterized by the X-ray photoelectron spectroscopy. Compared with the prior art, the sorbent according to the present invention has a better property in removing sulfur and nitrogen substances, and has higher regeneration stability.