Induction Heating in Nanoparticle Impregnated Zeolite.

Irene Morales,Mario Quijorna,M Rosário Ribeiro,Marta Muñoz,Jose Maria Alonso,Patricia De La Presa,Catia S Costa,João Miguel Silva,Marta Multigner

doi:10.3390/ma13184013

Abstract

The ultra-stable Y (H-USY) zeolite is used as catalyst for the conversion of plastic feedstocks into high added value products through catalytic cracking technologies. However, the energy requirements associated with these processes are still high. On the other hand, induction heating by magnetic nanoparticles has been exploited for different applications such as cancer treatment by magnetic hyperthermia, improving of water electrolysis and many other heterogeneous catalytic processes. In this work, the heating efficiency of γ-Fe2O3 nanoparticle impregnated zeolites is investigated in order to determine the potential application of this system in catalytic reactions promoted by acid catalyst centers under inductive heating. The γ-Fe2O3 nanoparticle impregnated zeolite has been investigated by X-ray diffraction, electron microscopy, ammonia temperature program desorption (NH3-TPD), H2 absorption, thermogravimetry and dc and ac-magnetometry. It is observed that the diffusion of the magnetic nanoparticles in the pores of the zeolite is possible due to a combined micro and mesoporous structure and, even when fixed in a solid matrix, they are capable of releasing heat as efficiently as in a colloidal suspension. This opens up the possibility of exploring the application at higher temperatures.

Highlights

The increase in plastic production (10% every year since 1950) with an increasingly shorter use causes serious environmental problems [1,2]
Efficiently as inrelaxation a liquid medium. This is because the Brownian relaxation at this size is negligible. All these results have shown that γ-Fe2 O3 magnetic nanoparticles, when subjected to radiofrequency fields, are able to release heat even when they are immobilized in a matrix making the γ-Fe2 O3 impregnated H-USY zeolite a good candidate for catalytic processes under heating induction
Temperature increase nanoparticle impregnated zeolite (NIZ, blackblack line) andthe forsample the sample chamber and for chamber. All these results have shown that γ-Fe2O3 magnetic nanoparticles, when subjected to radiofrequency fields, are able to release heat(15)

Summary

Introduction

The increase in plastic production (10% every year since 1950) with an increasingly shorter use causes serious environmental problems [1,2]. Conventional recycling pathways, such as mechanical recycling or incineration, exhibit some limitations. A very effective route for the conversion of waste plastic materials into high added value products involves the catalytic cracking of polymer chains promoted by acid catalysts [4]. Several publications refer to zeolite materials as effective catalysts for this type of application [5,6,7], since they have high thermal stability, strong acidity, a unique porous structure, and a highly crystalline framework [8]

Objectives

Methods

Conclusion