One-pot synthesis of lignin biochar supported Ni for catalytic pyrolysis of Chlorella vulgaris and its model compounds: The formation mechanism of aromatic hydrocarbons. (1st June 2023)

• Record Type: Journal Article
• Authors: Liu, Lei; Fan, Liangliang; Jin, Kuangli; Qian, Jun; Huang, Pei; Peng, Hongyu; Zhou, Wenguang; Chen, Paul; Ruan, Roger
• Is Part Of: Fuel. Volume 341(2023)
• Publication Date: 2023-06-01
• Subjects: Microalgae -- Biochar supported catalyst -- Model compounds -- Catalytic mechanism; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2023.127558
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlight: One-pot synthesis of Ni/biochar catalysts for microalgae pyrolysis was performed. Various model compounds were selected to study the conversion mechanism. Maximum aromatic selectivity of 98.64% was obtained from glucose conversion. Yield of benzene from the Chlorella catalytic pyrolysis reached 58.01 mg/g. Selectivity of nitrogenous compounds in the bio-oil decreased from 23.51% to 3.72%. Abstract: A novel catalyst of lignin biochar supported Ni was prepared through one-pot pyrolysis for the catalytic pyrolysis of Chlorella vulgaris. The catalysts with various Ni loading ratios were rich in functional groups with surface areas of 290.87–458.97 m 2 /g and average micropore sizes of 0.47–0.56 nm. The in-situ reduction during catalyst preparation yielded 33.13 % of Ni 0 with average particle size of 37.57 nm. The selectivity of benzene, toluene, and xylene (BTX) from the catalytic pyrolysis of the microalgae reached up to 75.62 % with the quantitative yield of benzene of 58.01 mg/g. The catalytic pyrolysis of the microalgae model compounds (rapeseed oil, glucose, soybean protein, and several amino acids) revealed high catalytic activity for the production of aromatic hydrocarbons based on glucose and soybean protein with 95.72 % and 90.75 % in selectivity, respectively. The study on model compounds conversion elucidated the formation mechanism of aromatic hydrocarbons by removal of heteroatoms (N and O).