SBA-15 Catalyst for COS and H2S Removal in Garbage Gasification
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Solution Overview
Problem
Existing catalysts for removing COS and H2S in garbage gasification face issues with active component deactivation and channel blocking, leading to inefficient desulfurization.
Innovation Solution
A catalyst using a mesoporous molecular sieve SBA-15 with a two-dimensional hexagonal structure and large pore diameter, modified with halogen atoms to prevent channel blocking, and loaded with manganese and tin oxides for efficient desulfurization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If activated carbon with micropore structure is used as carrier, then desulfurization efficiency is improved, but channels are blocked by elemental sulfur leading to limited service life
Solution Approach 1:
The patent uses mesoporous molecular sieve SBA-15 with large pore diameter (2.5-4 nm) instead of microporous activated carbon. The larger pores prevent blocking by elemental sulfur while maintaining high desulfurization efficiency, directly resolving the contradiction between efficiency and service life.
Solution Approach 2:
The patent transitions from the microporous structure to mesoporous structure, changing the pore size dimension. This dimensional change in pore structure allows sufficient space for sulfur deposition without blocking, thereby extending catalyst service life while maintaining efficiency.
2Reliability
If soluble zinc salt and copper salt are used as active components, then desulfurization activity is improved, but active components are easily lost due to acidic nature in water
Solution Approach 1:
The patent changes the chemical form of active components from soluble salts to oxides (ZnO, CuO), and changes the carrier from activated carbon to mesoporous molecular sieve. This parameter change in chemical state and carrier material prevents component loss while maintaining desulfurization activity.
Solution Approach 2:
The patent creates a composite material system combining metal oxides (ZnO, CuO) with mesoporous molecular sieve SBA-15. This composite structure provides stable support for active components, preventing their loss while maintaining high desulfurization activity.
3Reliability
If gas cooling apparatus is added to remove H2S and COS at normal temperature, then desulfurization is improved, but investment and cost are increased
Solution Approach 1:
The patent changes the operating temperature parameter from normal temperature to high temperature (300-400°C), matching garbage gasification conditions. This eliminates the need for additional cooling apparatus while achieving effective desulfurization.
4Device complexity
If detergent is directly used to remove H2S and COS at high temperature, then apparatus complexity is reduced, but active components are deactivated
Solution Approach 1:
The patent fundamentally changes the active components from soluble salts to heat-stable oxides (ZnO, CuO) and the carrier to mesoporous molecular sieve. This parameter change in material composition enables direct use at high temperature without deactivation, simplifying apparatus while maintaining effectiveness.
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 catalyst achieves a desulfurization efficiency of up to 100% by ensuring stable loading of active components and maintaining channel integrity, suitable for industrial production.
Implementation Method 1
The catalyst takes a mesoporous molecular sieve as a carrier, the carrier has a two-dimensional hexagonal structure and is large in pore diameter, channels are interconnected
Implementation Method 2
large pore diameter, channels are interconnected
Implementation Method 3
modified with halogen atoms to prevent channel blocking
Implementation Method 4
loaded with manganese and tin oxides for efficient desulfurization
Implementation Method 5
carbonyl sulfide and hydrogen sulfide are catalytically oxidized
Implementation Method 6
carbonyl sulfide and hydrogen sulfide are catalytically oxidized in one step into elemental sulfur
Data Source
AI summary
The disclosure discloses a catalyst capable of simultaneously removing COS and H2S in garbage gasification and a preparation method thereof, and belongs to the technical field of preparation of desulfurization catalysts. The method includes the following steps: pretreating an SBA-15 molecular sieve with a templating agent unremoved, which primarily includes the steps of removing the templating agent and introducing halogen atoms to modify the molecular sieve; then synthesizing an active component solution; and finally introducing active components into channels of the pretreated molecular sieve via surface tension by adopting an impregnation method, performing washing and drying, and performing calcining under an N2 atmosphere, so as to obtain the catalyst. The catalyst prepared according to the present disclosure can load the active components in fixed positions inside and outside the channels, and the components are easy to obtain, thereby having the advantages of low cost and good desulfurization effects.