Copper-Zinc Oxide Desulfurization Material for High Density Sulfur Capture
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Solution Overview
Problem
Current zinc oxide-based desulfurization materials have a practical upper limit in density due to low porosity and surface area, limiting their effectiveness in sulfur capture and requiring frequent change-outs in commercial operations.
Innovation Solution
Incorporating low levels of copper compounds supported on a zinc oxide material to enhance sulfur capture efficiency, allowing for higher density desulfurization materials with improved porosity and surface area, thereby increasing sulfur removal capacity and reducing change-out frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If zinc oxide based absorbents are made with high density to increase sulphur pick-up capacity, then the theoretical sulphur pick-up increases and time between change-outs is extended, but the low porosity and low surface area create a kinetic barrier to the sulphiding process that prevents effective utilization of ZnO
Solution Approach 1:
The invention changes the chemical composition parameter by introducing copper compounds (0.1-5.0% CuO) into the zinc oxide absorbent. This compositional modification transforms the kinetic properties of the material, enabling high density (≥1.55 kg/l) materials to achieve rapid sulphiding rates that would otherwise be impossible, thus resolving the contradiction between capacity and reaction speed
Solution Approach 2:
The invention creates a composite material system combining zinc oxide support material with copper compounds as active components. This composite structure leverages the high sulphur capacity of ZnO while the copper promoter provides enhanced surface reactivity and porosity characteristics, achieving both high density and fast kinetics simultaneously
2Quantity of substance
If zinc oxide based absorbents are made with high density to increase sulphur removal per unit volume, then the volume efficiency improves, but the low porosity limits the surface area available for reaction
Solution Approach 1:
The introduction of copper compounds modifies the physical parameters of the absorbent material, creating a unique structure where high density (≥1.55 kg/l) coexists with sufficient surface area (≥10 m²/g) and porosity (≥0.10 cm³/g). This parameter transformation allows the material to achieve high volumetric capacity without sacrificing reactive surface area
Solution Approach 2:
The copper promoter creates localized regions of high reactivity on the zinc oxide surface. Rather than requiring uniform high surface area throughout the material, the copper compounds concentrate catalytic activity at specific sites, enabling effective sulphur capture even in dense materials with limited overall porosity
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 copper-promoted zinc oxide materials achieve higher sulfur capacity per unit volume, maintain reaction zones within reasonable bed lengths, and provide hydrogenation capabilities for trace organo-sulfur compounds, improving operational efficiency and extending the time between change-outs.
Implementation Method 1
low levels of copper can significantly speed up the sulphiding process
Implementation Method 2
The zinc-based absorbents are designed to capture H2S according to the following equation; ZnO+H2S→ZnS+H2O
Implementation Method 3
ZnO+H2S→ZnS+H2O
Implementation Method 4
The presence of copper will also provide the absorbent with some hydrogenation capability, which could be beneficial with regards to removal of trace levels of organo-sulphur compounds
Data Source
AI summary
A particulate desulfurization material includes one or more copper compounds supported on a zinc oxide support material, wherein the desulfurization material has a copper content in the range 0.1 to 5.0% by weight and a tapped bulk density ≥1.55 kg/l. The material is obtained by (i) mixing a powdered copper compound with a particulate zinc support material comprising zinc oxide and one or more precursors that form zinc oxide upon calcination, and one or more binders to form a copper-containing composition, (ii) shaping the copper-containing composition by granulation, and (iii) drying and calcining the resulting granulated material.