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A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles

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Published on: April 10, 2019

Flow-Through PolyHIPE Silver-Based Catalytic Reactor.

Rok Mravljak¹, Ožbej Bizjak¹, Benjamin Božič¹

¹Department of Chemical Engineering and Technical Safety, Faculty for Chemistry and Chemical Technology, University of Ljubljana, SI-1000 Ljubljana, Slovenia.

|April 3, 2021

Summary

Continuous catalytic reactors using novel polymer materials offer enhanced efficiency. Immobilized silver nanoparticles within these reactors demonstrate stable and productive catalytic activity for processes like 4-nitrophenol reduction.

Keywords:

4-nitrophenol reduction AGET ATRP Tollens reagent heterogeneous catalysis silver

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Area of Science:

Materials Science
Chemical Engineering
Catalysis

Background:

Continuous catalytic reactors offer advantages over batch processes for efficiency and control.
Development of novel materials for immobilized catalysts is crucial for advanced reactor design.

Purpose of the Study:

To prepare and characterize homogenous high internal phase emulsion polymer materials with immobilized silver catalysts.
To evaluate the performance of these materials as continuous plug flow reactors.

Main Methods:

Functionalization of porous polymer materials with epoxide and aldehyde groups.
Reduction of silver ions using Tollens reagent to form immobilized silver nanoparticles.
Characterization of silver nanoparticle morphology, crystallinity, and surface coverage.
Testing catalytic activity using the reduction of 4-nitrophenol in a continuous flow system.

Main Results:

Silver nanoparticle deposition was dependent on aldehyde concentration and Tollens reagent composition.
Formed silver nanoparticles exhibited high crystallinity, cuboctahedra shape, and uniform surface coverage.
Catalytic reduction of 4-nitrophenol was dependent on the mass of deposited silver.
Reactor productivity increased with volumetric silver density and flow rate, showing stability over time.

Conclusions:

Homogenous high internal phase emulsion polymer materials can be effectively utilized as continuous plug flow reactors with immobilized silver catalysts.
The developed catalytic system demonstrates high stability, productivity, and potential for prolonged use in continuous chemical processes.