A CeCoOx Core/Nb2 O5 @TiO2 Double-Shell Nanocage Catalyst Demonstrates High Activity and Water Resistance for Catalytic Combustion of o-Dichlorobenzene

© 2021 Wiley-VCH GmbH..

A series of catalysts with different core-shell structures has been successfully prepared by a hydrothermal method. They consisted of CeCoOx TiO2 (single shell), CeCoOx @Nb2 O5 (single shell) and CeCoOx @Nb2 O5 @TiO2 (double shell) core-shell nanocages and CeCoOx nanocages, in which CeCoOx was the core and TiO2 and Nb2 O5 were shells. The influence of the core-shell structure on the catalytic performance of o-dichlorobenzene was investigated by activity, water-resistance, and thermal stability tests as well as catalyst characterization. The temperatures corresponding to 90 % conversion of o-dichlorobenzene (T90 ) of CeCoOx , CeCoOx @TiO2 , CeCoOx @Nb2 O5 , and CeCoOx @Nb2 O5 @TiO2 catalysts were 415, 383, 362 and 367 °C, respectively. CeCoOx @Nb2 O5 exhibited excellent catalytic activity, mainly owing to the special core-shell structure, large specific surface area, abundant activity of Co3+ , Ce3+ , Nb5+ , strong reducibility, and more active oxygen vacancies. It can be seen that the Nb2 O5 coating can greatly improve the catalytic activity of the catalyst. In addition, due to the protective effect of the TiO2 shell on CeCoOx , CeCoOx @Nb2 O5 @TiO2 catalysts exhibited outstanding thermal and hydrothermal stability for 20 hours. The T90 of CeCoOx @Nb2 O5 @TiO2 was slightly lower than that of CeCoOx @Nb2 O5 , but it had higher stability and hydrothermal stability. Furthermore, possible reaction pathways involving the Mars-van-Krevelen (MvK) and Langmuir-Hinshelwood (L-H) models were deduced based on studies of the temperature-programmed desorption of O2 (O2 -TPD), X-ray photoelectron spectroscopy (XPS), and in situ diffuse reflectance FTIR spectroscopy (DRIFTS) characterization.

Medienart:

E-Artikel

Erscheinungsjahr:

2021

Erschienen:

2021

Enthalten in:

Zur Gesamtaufnahme - volume:27

Enthalten in:

Chemistry (Weinheim an der Bergstrasse, Germany) - 27(2021), 40 vom: 16. Juli, Seite 10356-10368

Sprache:

Englisch

Beteiligte Personen:

Ling, Weitong [VerfasserIn]
Zhao, Haijun [VerfasserIn]
Wu, Shilin [VerfasserIn]
Tang, Zhicheng [VerfasserIn]
Zha, Fei [VerfasserIn]

Links:

Volltext

Themen:

Catalytic combustion
Co−Ce-ZIFs
Double-wall nanocages
Journal Article
O-dichlorobenzene
Synergistic effects

Anmerkungen:

Date Revised 19.07.2021

published: Print-Electronic

Citation Status PubMed-not-MEDLINE

doi:

10.1002/chem.202100392

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM325402442