Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Catalytic Evaluation of Hafnium Modified SiO2 for the Dehydration of Alcohols

Heriberto Esteban Benito
ORCID logo ,
Ricardo García Alamilla
,
Luz Arcelia García Serrano
* ,
Francisco Paraguay Delgado
,
Juan Antonio Carmona García
Version 1 : Received: 28 June 2023 / Approved: 28 June 2023 / Online: 29 June 2023 (02:33:22 CEST)

A peer-reviewed article of this Preprint also exists.

Esteban Benito, H.; García Alamilla, R.; García Serrano, L.A.; Paraguay Delgado, F.; Carmona García, J.A. Catalytic Evaluation of Hafnium Modified SiO2 for the Dehydration of Alcohols. Appl. Sci. 2023, 13, 8541. Esteban Benito, H.; García Alamilla, R.; García Serrano, L.A.; Paraguay Delgado, F.; Carmona García, J.A. Catalytic Evaluation of Hafnium Modified SiO2 for the Dehydration of Alcohols. Appl. Sci. 2023, 13, 8541.

Abstract

The influence of hafnium metal (Hf) and sulfate ions (SO4-2) on the acidic properties of SiO2 mesopores synthesized by a non-hydrothermal method was studied using the following characterization techniques; TG-DTG, XRD, BET, SEM, TEM, EDS, FTIR, n-butylamine titration, FTIR-pyridine, and alcohol dehydration. The incorporation of 3.6% mol of Hf during the silicate synthesis step caused the characteristic structural arrangement of MCM-41 to collapse. However, an increase in the acid strength of the catalyst of up to 315 mV was observed, with Brönsted and Lewis-type acid sites being mostly present therein. Furthermore, the acidity of Hf- and (SO4-2) -modified SiO2 in the dehydration of ethanol and methanol was evaluated, resulting in a selectivity towards ethylene and dimethyl ether, respectively. Acid solids have enormous potential to produce important compounds for the chemical industry using alternative routes other than petrochemical processes. They also represent a significant advance for biorefineries.

Keywords

Acidity; dehydration; ethylene; dimethyl ether

Subject

Chemistry and Materials Science, Materials Science and Technology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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