Ethylene production from ethanol dehydration over mesoporous SBA-15 catalyst derived from palm oil clinker waste

Cheng, Yoke Wang and Chong, Chi Cheng and Cheng, Chin Kui and Ng, Kim Hoong and Witoon, Thongthai and Juan, Joon Ching (2020) Ethylene production from ethanol dehydration over mesoporous SBA-15 catalyst derived from palm oil clinker waste. Journal of Cleaner Production, 249. ISSN 0959-6526, DOI

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The silica-rich palm oil clinker (POC) from oil palm agroindustry is often dumped in landfill. This work investigated the valorisation of POC into Santa Barbara Amorphous-15 (SBA-15) catalyst, the modulation of its surface acidity, and its application in dehydration of ethanol to ethylene. With commercial SBA-15 SBA-15(Comm.)] as reference, the successful fabrication of POC-derived SBA-15 POC-SBA-15(pH = 3, 5, and 7)] were validated by spectroscopic and microscopic characterisation. From the results of temperature-programmed desorption of ammonia, the SBA-15(Comm.) have high strong acidity while POC-SBA-15 exhibit enriched weak-moderate acidity. For ethanol dehydration over SBA-15 at 200 -400 degrees C, the ethanol conversion (X-C2H5OH) and ethylene selectivity (S-C2H4) rise with temperature. The catalytic activity was ranked as SBA-15(Comm.) < POC-SBA-15(3) < POC-SBA-15(7) < POC-SBA-15(5). Spent catalysts characterisation unanimously confirms the least carbon deposition on POC-SBA-15(5), which subsequently used to study the effect of initial ethanol concentration and liquid hourly space velocity (LHSV). When 99.5 wt% ethanol diluted to 50 wt%, the competitive adsorption between ethanol and water reduces X-C2H5OH but enhances S-C2H4. Further ethanol dilution (<= 30 wt%) deteriorates S-C2H4 following remarkable ethanol steam reforming at elevated temperature (>= 350 degrees C). For 50 wt% ethanol dehydration over POC-SBA-15(5) at 400 degrees C, a greater LHSV furnishes a higher ethanol partial pressure that increases X-C2H5OH but decreases S-C2H4. When LHSV >16 mL/g$h, the saturation of finite active sites with adsorbates renders the drastic declination of X-C2H5OH and S-C2H4. For ethanol dehydration over POCSBA-15(5), the optimal conditions are temperature of 400 degrees C, initial ethanol concentration of 50 wt%, and LHSV of 16 mL/g$h. Fresh POC-SBA-15(5) steadily catalyses the optimal process (73.33% X-C2H5OH and 84.70% S-C2H4) up to 105 h. Meanwhile, regenerated POC-SBA-15(5) achieves a lower catalytic activity (71.95% X-C2H5OH and 81.96% S-C2H4). (C) 2019 Elsevier Ltd. All rights reserved.

Item Type: Article
Funders: Ministry of Higher Education (MOHE), Malaysia [RDU170116]
Uncontrolled Keywords: Palm oil clinker; Mesoporous SBA-15; Ethanol dehydration; Ethylene; Surface acidity; Operating conditions
Subjects: Q Science > QD Chemistry
Divisions: Deputy Vice Chancellor (Research & Innovation) Office > Nanotechnology & Catalysis Research Centre
Depositing User: Ms Zaharah Ramly
Date Deposited: 05 Oct 2023 00:41
Last Modified: 05 Oct 2023 00:41

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