Ethylene production from ethanol dehydration over mesoporous SBA-15 catalyst derived from palm oil clinker waste
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 comm...
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my.utp.eprints.234452021-08-19T07:20:05Z Ethylene production from ethanol dehydration over mesoporous SBA-15 catalyst derived from palm oil clinker waste Cheng, Y.W. Chong, C.C. Cheng, C.K. Ng, K.H. Witoon, T. Juan, J.C. 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 Elsevier Ltd 2020 Article NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85075870648&doi=10.1016%2fj.jclepro.2019.119323&partnerID=40&md5=fe2c738b5e12bb07547d0c898180a6ee 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 . http://eprints.utp.edu.my/23445/ |
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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 °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 |
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Cheng, Y.W. Chong, C.C. Cheng, C.K. Ng, K.H. Witoon, T. Juan, J.C. |
spellingShingle |
Cheng, Y.W. Chong, C.C. Cheng, C.K. Ng, K.H. Witoon, T. Juan, J.C. Ethylene production from ethanol dehydration over mesoporous SBA-15 catalyst derived from palm oil clinker waste |
author_facet |
Cheng, Y.W. Chong, C.C. Cheng, C.K. Ng, K.H. Witoon, T. Juan, J.C. |
author_sort |
Cheng, Y.W. |
title |
Ethylene production from ethanol dehydration over mesoporous SBA-15 catalyst derived from palm oil clinker waste |
title_short |
Ethylene production from ethanol dehydration over mesoporous SBA-15 catalyst derived from palm oil clinker waste |
title_full |
Ethylene production from ethanol dehydration over mesoporous SBA-15 catalyst derived from palm oil clinker waste |
title_fullStr |
Ethylene production from ethanol dehydration over mesoporous SBA-15 catalyst derived from palm oil clinker waste |
title_full_unstemmed |
Ethylene production from ethanol dehydration over mesoporous SBA-15 catalyst derived from palm oil clinker waste |
title_sort |
ethylene production from ethanol dehydration over mesoporous sba-15 catalyst derived from palm oil clinker waste |
publisher |
Elsevier Ltd |
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2020 |
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https://www.scopus.com/inward/record.uri?eid=2-s2.0-85075870648&doi=10.1016%2fj.jclepro.2019.119323&partnerID=40&md5=fe2c738b5e12bb07547d0c898180a6ee http://eprints.utp.edu.my/23445/ |
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