Copper-Palladium Mesoporous Silicon Carbide Catalyst for Nitrate Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional denitrification technologies are complex, cause secondary pollution, and have safety hazards, while existing palladium-copper catalytic systems for nitrate reduction in water bodies lack efficiency and nitrogen selectivity.
Innovation Solution
A copper-palladium-loaded mesoporous silicon carbide-based catalyst is prepared using a method involving P123, tetraethyl orthosilicate, polycarbosilane, and metal precursors, which provides a stable and efficient catalytic system for nitrate reduction with high nitrogen selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional denitrification treatment technologies are used, then nitrate removal can be achieved, but the process requires complicated operations and causes secondary pollution
Solution Approach 1:
The patent extracts and eliminates the complex operational steps and secondary pollution issues from traditional denitrification methods by developing a novel electrocatalytic system using copper-palladium-loaded mesoporous silicon carbide, which achieves nitrate removal through a simplified single-step electrocatalytic process without requiring complicated operations or follow-up treatments
Solution Approach 2:
The patent employs composite materials (copper-palladium bimetallic catalyst loaded on mesoporous silicon carbide support) to achieve superior catalytic performance for nitrate removal, combining the advantages of different materials to improve efficiency while simplifying the overall treatment process and eliminating secondary pollution
2Productivity
If existing palladium-copper catalytic systems are used for nitrate reduction, then some catalytic activity is achieved, but the efficiency and nitrogen selectivity need further improvement
Solution Approach 1:
The patent applies local quality by creating specific active sites on the copper-palladium bimetallic catalyst surface and utilizing the mesoporous structure of silicon carbide to provide localized environments that enhance both catalytic efficiency and nitrogen selectivity, addressing the limitations of existing palladium-copper systems
Solution Approach 2:
The patent utilizes porous materials (mesoporous silicon carbide with controlled pore structure) as the catalyst support to improve reactant accessibility and product selectivity, thereby enhancing both catalytic efficiency and nitrogen selectivity compared to conventional non-porous catalyst systems
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 efficiently reduces nitrate in water with various concentrations and pH levels, offering improved catalytic activity and selectivity compared to traditional systems, with mesoporous silicon carbide acting as both a carrier and hydrogen-producing catalyst.
Implementation Method 1
mixing and stirring P123 (polyethylene oxide-polypropylene oxide-polyethylene oxide, PEO-PPO-PEO), deionized water, hydrochloric acid, and tetraethyl orthosilicate (TEOS) to obtain a homogeneous solution; stirring the homogeneous solution in a water bath at 40° C. for 24 hours, then transferring into a stainless-steel autoclave for crystallization
Implementation Method 2
dissolving polycarbosilane in xylene to obtain a polycarbosilane solution; mixing and stirring the mesoporous silica and the polycarbosilane solution, drying after the xylene solvent is completely volatilized, and subjecting dried powder to calcination, etching, washing and drying to obtain the mesoporous silicon carbide
Implementation Method 3
the etching is to mix and stir with an excess of 4 wt % HF aqueous solution for 24 hours
Implementation Method 4
adding the mesoporous silicon carbide to the copper-palladium precursor mixed solution, drying after the solvent is completely evaporated, and calcination in a nitrogen atmosphere and reduction in a hydrogen atmosphere successively to obtain the copper-palladium-loaded mesoporous silicon carbide-based catalyst
Data Source
AI summary
A copper-palladium-loaded mesoporous silicon carbide-based catalyst, a preparation method, and an application thereof are provided. First, a mesoporous silicon carbide material is prepared by using mesoporous silica as a hard template; subsequently, the mesoporous silicon carbide material is mixed with a copper-palladium precursor mixed solution, and dried after the solvent is completely volatilized. The dried powder is successively subjected to calcination with N2 and reduction with H2 to finally obtain the copper-palladium-loaded mesoporous silicon carbide-based catalyst. The catalyst is made into an electrode, and the nitrate in water body is catalytically reduced by electrochemical method. The preparation method of the catalyst of the present invention is simple. The catalyst can realize high-efficiency catalytic denitrification at a low metal loading amount, with high selectivity of nitrogen. Moreover, the catalyst has the advantages of high activity, good stability, wide application range and low cost.