title: Ceria promoted deoxygenation and denitrogenation of Thalassiosira weissflogii and its model compounds by catalytic in-situ pyrolysis.
abstract: Pyrolysis of microcrystalline cellulose, egg white powder, palm-jojoba oils mixtures Thalassiosira weissflogii model compounds was performed with CeO2 at 500°C, to evaluate its catalytic upgrading mechanism. Light organics, aromatics and aliphatics were originated from carbohydrates, proteins and lipids, respectively. Dehydration and decarboxylation were the main reactions involved in the algae and model compounds deoxygenation, while nitrogen was removed as NH3 and HCN. CeO2 increased decarbonylation reactions compared to in absence of catalyst, with production of ketones. The results showed that the catalysts had a significant effect on the pyrolysis products composition of T. weissflogii. CeO2, NiCeAl2O3 and MgCe/Al2O3 catalysts increased the aliphatics and decreased the oxygen content in bio-oils to 6-7 wt% of the algae starting O2 content. Ceria catalysts were also able to consistently reduce the N-content in the bio-oil to 20-38% of that in the parent material, with NiCe/Al2O3 being the most effective.
authors.affiliation: Institute of Mechanical, Process and Energy Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, EH14 4AS Edinburgh, UK; Department of Chemistry, Faculty of Education, Yuzuncu Yil University, 65080 Van, Turkey.
authors.forename: Tevfik
authors.initials: T
authors.lastname: Aysu
authors.affiliation: Institute of Mechanical, Process and Energy Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, EH14 4AS Edinburgh, UK.
authors.forename: M Mercedes
authors.initials: MM
authors.lastname: Maroto-Valer
authors.affiliation: Institute of Mechanical, Process and Energy Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, EH14 4AS Edinburgh, UK. Electronic address: A.Sanna@hw.ac.uk.
authors.forename: Aimaro
authors.initials: A
authors.lastname: Sanna
mesh_terms: D000641:Ammonia / Q000737:chemistry; D002384:Catalysis; D002482:Cellulose / Q000737:chemistry; D002563:Cerium / Q000737:chemistry*; D017377:Diatoms / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D009682:Magnetic Resonance Spectroscopy; D009584:Nitrogen / Q000737:chemistry; D009821:Oils / Q000737:chemistry; D013696:Temperature
chemical_list: D009821:Oils; D002563:Cerium; C030583:ceric oxide; D000641:Ammonia; D002482:Cellulose; D009584:Nitrogen; C109691:microcrystalline cellulose
keywords: Bio-oil; Catalytic pyrolysis; Ceria; Model compound; Thalassiosira weissflogii