Production of Ethylene through Ethanol Dehydration on SBA-15 Catalysts Synthesized by Sol-gel and One-step Hydrothermal Methods

Abstract

The present work deals with the catalytic performance of SBA-15 supported catalysts in the gas phase catalytic dehydration of ethanol in the temperature range of 200 to 400°C. The SBA-15 support was incorporated on a zirconium (Zr) and bimetal of zirconium and lanthanum (Zr-La) prepared by sol-gel (SG) and hydrothermal (HT) methods. The catalysts were characterized by means of N physisorption, SEM/EDX, and NH-TPD. The experimental results demonstrated that the Zr-La/SBA-15-HT exhibited the highest catalytic activity. Ethanol conversion and ethylene selectivity were found to increase with increased reaction temperature. The best catalytic results were achieved for Zr-La/SBA-15-HT indicating values of ethanol conversion and ethylene yield of ca. 84% and 80%, respectively at 400°C. The most important parameter influencing their catalytic properties appears to be the interaction between metal and support depending on different methods. The metal dispersion inside the siliceous matrix of SBA-15 has a direct influence on their surface acidity. Meanwhile, the performance of these SBA-15 supported catalysts in ethanol dehydration is also related with the alteration of surface acidity caused by the introduction of Zr and Zr-La.

Dehydrogenation of Ethanol to Acetaldehyde over Different Metals Supported on Carbon Catalysts

“…Direct dehydrogenation of ethanol to acetaldehyde has gained great attention because it is an economical and environmentally friendly alternative to conventional commercial processes [3][4][5]. In previous studies, the catalytic activities of catalysts, such as ZrO 2 [3,4], SiO 2 [3], Al 2 O 3 [5,6], ZSM-5 [6], SBA-15 [7], and MCM-41 [8], with high acidities for ethanol reaction have been studied.…”

Ethanol Dehydration over WO3/TiO2Catalysts Using Titania Derived from Sol-Gel and Solvothermal Methods

“…71°C, respectively. is is perhaps due to the high reaction temperature or the heat treatment e ect to an oxidation of Lewis oxygen in pure TiO 2 structure with the basic site is more dominant than acid as seen from the pure SBA-15 catalyst used in ethanol dehydration reported by Autthanit and Jongsomjit in 2018 [47]. e mechanism of ethanol dehydrogenation to acetaldehyde over TiO 2 support is illustrated in Scheme 3.…”

“…As shown in Table 3, the weak acid sites for WO 3 /TiO 2 catalyst were signi cantly higher than TiO 2 support catalyst, whereas the strong acid sites for TiO 2 were higher than the WO 3 /TiO 2 catalyst. It is familiar that amount of weak acid site is probably correlated to Brønsted acid site, while the Lewis acid site may correlate to the strong acid site [47].…”

Catalytic Dehydration of Ethanol over W/TiO2 Catalysts Having Different Phases of Titania Support

“…The procedure used in carrying out the reactions was similar to those described by our previous work [13,14].The catalytic ethanol dehydration was performed under atmospheric pressure in a fixed-bed flow microreactor. The catalyst (0.05 g) was charged onto packed quartz wool (0.01 g) in the middle of microreactor.…”