Catalytic Depolymerization of Date Palm Waste to Valuable C5–C12 Compounds
Lignin depolymerization often requires multiple isolation steps to convert a lignocellulose matrix into high-value chemicals. In addition, lignin structural modification, low yields, and poor product characteristics remain challenges. Direct catalytic depolymerization of lignocellulose from date pal...
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MDPI AG
2021-03-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/11/3/371 |
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| author | Emmanuel Galiwango Ali H. Al-Marzuoqi Abbas A. Khaleel Mahdi M. Abu-Omar |
| author_facet | Emmanuel Galiwango Ali H. Al-Marzuoqi Abbas A. Khaleel Mahdi M. Abu-Omar |
| author_sort | Emmanuel Galiwango |
| collection | DOAJ |
| description | Lignin depolymerization often requires multiple isolation steps to convert a lignocellulose matrix into high-value chemicals. In addition, lignin structural modification, low yields, and poor product characteristics remain challenges. Direct catalytic depolymerization of lignocellulose from date palm biomass was investigated. Production of high value chemicals heavily depends on optimization of different parameters and method of conversion. The goal of the study was to elucidate the role of different parameters on direct conversion of date palm waste in a bench reactor, targeting valuable C5–C12 compounds. The catalytic performance results demonstrated better liquid yields using a commercial alloy catalyst than with laboratory-prepared transition metal phosphide catalysts made using nickel, cobalt, and iron. According to the gas chromatography-mass spectrometry results, C7–C8 compounds were the largest product fraction. The yield improved from 3.6% without a catalyst to 68.0% with a catalyst. The total lignin product yield was lower without a catalyst (16.0%) than with a catalyst (76.0%). There were substantial differences between the carbon distributions from the commercial alloy catalyst, supported transition metal phosphide catalyst, and catalyst-free processes. This may be due to differences between reaction pathways. Lab-made catalysts cracked the biomass to produce more gases than the alloy catalyst. The final pressure rose from 2 bar at the start of the experiment to 146.15 bar and 46.50 bar after the respective reactions. The particle size, solvent type, time, temperature, gas, and catalytic loading conditions were 180 µm, methanol, 6 h, 300 °C, nitrogen, and 5 wt %, respectively. The results from this study provide a deep understanding of the role of different process parameters, the positive attributes of the direct conversion method, and viability of date palm waste as a potential lignocellulose for production of high-value chemicals. |
| first_indexed | 2024-03-10T13:18:12Z |
| format | Article |
| id | doaj.art-3ad32ee4fdc34adab059b113bd8ba67f |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-10T13:18:12Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-3ad32ee4fdc34adab059b113bd8ba67f2023-11-21T10:11:27ZengMDPI AGCatalysts2073-43442021-03-0111337110.3390/catal11030371Catalytic Depolymerization of Date Palm Waste to Valuable C5–C12 CompoundsEmmanuel Galiwango0Ali H. Al-Marzuoqi1Abbas A. Khaleel2Mahdi M. Abu-Omar3Department of Chemical and Petroleum Engineering, United Arab Emirates University, Al Ain 15551, United Arab EmiratesDepartment of Chemical and Petroleum Engineering, United Arab Emirates University, Al Ain 15551, United Arab EmiratesDepartment of Chemistry, United Arab Emirates University, Al-Ain 15551, United Arab EmiratesDepartment of Chemistry and Biochemistry and Biochemistry, UC Santa Barbara, Santa Barbara, CA 93106, USALignin depolymerization often requires multiple isolation steps to convert a lignocellulose matrix into high-value chemicals. In addition, lignin structural modification, low yields, and poor product characteristics remain challenges. Direct catalytic depolymerization of lignocellulose from date palm biomass was investigated. Production of high value chemicals heavily depends on optimization of different parameters and method of conversion. The goal of the study was to elucidate the role of different parameters on direct conversion of date palm waste in a bench reactor, targeting valuable C5–C12 compounds. The catalytic performance results demonstrated better liquid yields using a commercial alloy catalyst than with laboratory-prepared transition metal phosphide catalysts made using nickel, cobalt, and iron. According to the gas chromatography-mass spectrometry results, C7–C8 compounds were the largest product fraction. The yield improved from 3.6% without a catalyst to 68.0% with a catalyst. The total lignin product yield was lower without a catalyst (16.0%) than with a catalyst (76.0%). There were substantial differences between the carbon distributions from the commercial alloy catalyst, supported transition metal phosphide catalyst, and catalyst-free processes. This may be due to differences between reaction pathways. Lab-made catalysts cracked the biomass to produce more gases than the alloy catalyst. The final pressure rose from 2 bar at the start of the experiment to 146.15 bar and 46.50 bar after the respective reactions. The particle size, solvent type, time, temperature, gas, and catalytic loading conditions were 180 µm, methanol, 6 h, 300 °C, nitrogen, and 5 wt %, respectively. The results from this study provide a deep understanding of the role of different process parameters, the positive attributes of the direct conversion method, and viability of date palm waste as a potential lignocellulose for production of high-value chemicals.https://www.mdpi.com/2073-4344/11/3/371depolymerizationlignocellulosedirect conversion processcatalysishigh-value chemicals |
| spellingShingle | Emmanuel Galiwango Ali H. Al-Marzuoqi Abbas A. Khaleel Mahdi M. Abu-Omar Catalytic Depolymerization of Date Palm Waste to Valuable C5–C12 Compounds Catalysts depolymerization lignocellulose direct conversion process catalysis high-value chemicals |
| title | Catalytic Depolymerization of Date Palm Waste to Valuable C5–C12 Compounds |
| title_full | Catalytic Depolymerization of Date Palm Waste to Valuable C5–C12 Compounds |
| title_fullStr | Catalytic Depolymerization of Date Palm Waste to Valuable C5–C12 Compounds |
| title_full_unstemmed | Catalytic Depolymerization of Date Palm Waste to Valuable C5–C12 Compounds |
| title_short | Catalytic Depolymerization of Date Palm Waste to Valuable C5–C12 Compounds |
| title_sort | catalytic depolymerization of date palm waste to valuable c5 c12 compounds |
| topic | depolymerization lignocellulose direct conversion process catalysis high-value chemicals |
| url | https://www.mdpi.com/2073-4344/11/3/371 |
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