Characterization of acid-base centres of vermiculite/a-fe2o3 nanoparticles catalyst applied for depolymerization of polystyrene

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F20%3A10246290" target="_blank" >RIV/61989100:27360/20:10246290 - isvavai.cz</a>

Alternative codes found

RIV/61989100:27710/20:10246290

Result on the web

<a href="http://dx.doi.org/10.37904/nanocon.2019.8466" target="_blank" >http://dx.doi.org/10.37904/nanocon.2019.8466</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.37904/nanocon.2019.8466" target="_blank" >10.37904/nanocon.2019.8466</a>

Result language

angličtina

Original language name

Characterization of acid-base centres of vermiculite/a-fe2o3 nanoparticles catalyst applied for depolymerization of polystyrene

Original language description

The acid-base centres on the catalyst surface play important role in catalysis chemistry, influencing protons activity in reaction mechanism. The work presents the characteristics of acid-base centres on the vermiculite/αFe2O3 nanoparticles composites, when used as catalyst for the chemical recycling of polystyrene to styrene. The iron oxides are often used in chemical/petrochemical application as catalyst. The vermiculite is cheap natural clay mineral, which is commonly used as catalyst support. The vermiculite/α-Fe2O3 nanoparticles composites were prepared by precipitation and calcination at 500 and 700 oC. The acid-base centres on the catalyst surface were characterized by TPD (Temperature Programmed Desorption) method allowing to detect the molecules NH3 and CO2 desorbed from the surface when the surface temperature is increased. The temperature of surface and the peak from desorbed molecules suggest the strength of chemical bond between desorbed molecules and surface. Before desorption, the NH3 and CO2 are adsorbed on the surface of catalysts by chemisorption. The TPD method was supplemented with the laboratory analyses using XRD and SEM. It has been found that the vermiculite/α-Fe2O3 nanoparticles composite calcined at 500 oC has medium-strong base centres on the surface, although the pure vermiculite is a light acid and pure α-Fe2O3 is a neutral material. For this reason, it can be successfully applied to the depolymerization reaction in conversion to the styrene monomer. The calcination temperature 700 oC did not improve the basicity, but rather led to its suppression.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20400 - Chemical engineering

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

NANOCON 2019 : 11th International Conference on Nanomaterials - Research &amp; Application : conference proceedings : peer reviewed : October 16th-18th 2019, Hotel Voronez I, Brno, Czech Republic, EU

ISBN

978-80-87294-95-6

ISSN

2694-930X

e-ISSN

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Number of pages

6

Pages from-to

596-601

Publisher name

Tanger

Place of publication

Ostrava

Event location

Brno

Event date

Oct 16, 2019

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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