Journal
APPLIED SCIENCES-BASEL
Volume 13, Issue 14, Pages -Publisher
MDPI
DOI: 10.3390/app13148541
Keywords
acidity; dehydration; ethylene; dimethyl ether
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The influence of hafnium metal (Hf) and sulfate ions (SO42-) on the acidic properties of SiO2 mesopores was investigated. The addition of Hf resulted in collapse of the structural arrangement of MCM-41, but an increase in acid strength was observed. Hf- and (SO42-) -modified SiO2 showed selectivity towards the dehydration of ethanol and methanol, producing ethylene and dimethyl ether, respectively.
The influence of hafnium metal (Hf) and sulfate ions (SO42-) 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 Bronsted and Lewis-type acid sites being mostly present therein. Furthermore, the acidity of Hf- and (SO42-) -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.
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