eprintid: 13342
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/01/33/42
datestamp: 2023-11-10 03:27:54
lastmod: 2023-11-10 03:27:54
status_changed: 2023-11-10 01:50:55
type: article
metadata_visibility: show
creators_name: Cheng, Y.W.
creators_name: Chong, C.C.
creators_name: Cheng, C.K.
creators_name: Ng, K.H.
creators_name: Witoon, T.
creators_name: Juan, J.C.
title: Ethylene production from ethanol dehydration over mesoporous SBA-15 catalyst derived from palm oil clinker waste
ispublished: pub
keywords: Ammonia; Catalyst activity; Dehydration; Ethylene; Palm oil; Silica; Steam reforming; Temperature programmed desorption, Ethanol dehydration; Mesoporous SBA-15; Operating condition; Palm oil clinkers; Surface acidity, Ethanol
note: cited By 24
abstract: 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 °C, the ethanol conversion (XC2H5OH) and ethylene selectivity (SC2H4) 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 XC2H5OH but enhances SC2H4. Further ethanol dilution (�30 wt%) deteriorates SC2H4 following remarkable ethanol steam reforming at elevated temperature (�350 °C). For 50 wt% ethanol dehydration over POC-SBA-15(5) at 400 °C, a greater LHSV furnishes a higher ethanol partial pressure that increases XC2H5OH but decreases SC2H4. When LHSV >16 mL/g·h, the saturation of finite active sites with adsorbates renders the drastic declination of XC2H5OH and SC2H4. For ethanol dehydration over POC-SBA-15(5), the optimal conditions are temperature of 400 °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% XC2H5OH and 84.70% SC2H4) up to 105 h. Meanwhile, regenerated POC-SBA-15(5) achieves a lower catalytic activity (71.95% XC2H5OH and 81.96% SC2H4). © 2019 Elsevier Ltd
date: 2020
publisher: Elsevier Ltd
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85075870648&doi=10.1016%2fj.jclepro.2019.119323&partnerID=40&md5=fe2c738b5e12bb07547d0c898180a6ee
id_number: 10.1016/j.jclepro.2019.119323
full_text_status: none
publication: Journal of Cleaner Production
volume: 249
refereed: TRUE
issn: 09596526
citation:   Cheng, Y.W. and Chong, C.C. and Cheng, C.K. and Ng, K.H. and Witoon, T. and Juan, J.C.  (2020) Ethylene production from ethanol dehydration over mesoporous SBA-15 catalyst derived from palm oil clinker waste.  Journal of Cleaner Production, 249.   ISSN 09596526