University of Oulu

Zouhair El Assal, Satu Ojala, Satu Pitkäaho, Laurence Pirault-Roy, Bouchra Darif, Jean-Dominique Comparot, Mohammed Bensitel, Riitta L. Keiski, Rachid Brahmi, Comparative study on the support properties in the total oxidation of dichloromethane over Pt catalysts, Chemical Engineering Journal, Volume 313, 2017, Pages 1010-1022, ISSN 1385-8947, https://doi.org/10.1016/j.cej.2016.10.139

Comparative study on the support properties in the total oxidation of dichloromethane over Pt catalysts

Saved in:
Author: El Assal, Zouhair1,2,3; Ojala, Satu1; Pitkäaho, Satu1;
Organizations: 1Environmental and Chemical Engineering, Faculty of Technology, P.O. Box 4300, FI-90014 University of Oulu, Finland
2Thule Institute, P.O. Box 7300, FI-90014 University of Oulu, Finland
3Laboratory of Catalysis and Corrosion of Materials (LCCM), Department of Chemistry, Faculty of Sciences of El Jadida, University of Chouaïb Doukkali, BP.20, 24000 El Jadida, Morocco
4Institute of Chemistry of Poitiers: Materials and Natural Resources, IC2MP-UMR 7285, University of Poitiers, B27, 4, Rue Michel Brunet, TSA 51106, 86073 Poitiers Cedex, France
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 2.3 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe201903229789
Language: English
Published: , 2017
Publish Date: 2018-11-02
Description:

Abstract

The aim of this work was to study the influence of the support oxide properties on the total oxidation of dichloromethane in moist conditions. The support materials γ-Al2O3, TiO2, CeO2 and MgO were synthesized by a sol-gel method followed by wet impregnation of Pt and characterized by different physico-chemical techniques. The conversion of DCM was higher than 90% at 500 °C over impregnated and non-impregnated Al2O3, TiO2 and CeO2, even at high GHSV. CO, CH3Cl and CH2O were the major by-products observed and their amounts decreased after Pt impregnation. The CH3Cl formation was higher when Lewis acid sites were present while the existence of Brønsted sites promoted the CH2O formation. The complete conversion of DCM was achieved at around 450 °C over the Al2O3 and Pt/Al2O3 and at 500 °C for Pt/TiO2. These two catalysts exhibited the highest total acidities among the materials tested. The activity of Pt/Al2O3 remained the same also after 55 h of testing, however, increase in Pt particle size and decrease in acidity were observed. Pt/CeO2 while being less active showed smallest amount of by-product formation during the whole temperature range used in light-off tests. This is most probably due to its easy reduction ability. The textural parameters of the supports did not appear to be the key parameters when considering the activity and selectivity of the catalysts.

see all

Volume: 313
Pages: 1010 - 1022
DOI: 10.1016/j.cej.2016.10.139
OADOI: https://oadoi.org/10.1016/j.cej.2016.10.139
Type of Publication: A1 Journal article – refereed
Field of Science: 218 Environmental engineering
Subjects:
Funding: The work was done with the financial support from PHC Volubilis (No. 24618ZJ) and the Thule Institute at the University of Oulu.
Copyright information: © 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
  https://creativecommons.org/licenses/by-nc-nd/4.0/