期刊
FUEL
卷 298, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2021.120658
关键词
Selective hydrogenation; High-quality biofuel; MCM-41 nano-aggregates; Bimetallic catalysts; High sulfur resistance
资金
- Ratchadapisek Somphot Fund
- Chulalongkorn University
- Thailand Research Fund [PHD/0072/2558]
- Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Thailand
- National Institute of Advanced Industrial Science and Technology (AIST)
- Japan International Cooperation Agency (JICA), Japan
- National Metal and Materials Technology Center (MTEC), Thailand
The study investigated the partial hydrogenation of soybean oil-derived fatty acid methyl esters using MCM-41 mesoporous silica-supported Pd-Pt bimetallic catalysts, resulting in the production of H-FAME enriched in mono-FAME as a potential source for high blends of biodiesel fuel. Various MCM-41 supports with different structural properties and morphologies were synthesized using different amounts of ammonia solution, leading to a series of Pd-Pt/MCM-41 bimetallic catalysts with tunable porosity.
Partial hydrogenation of soybean oil-derived fatty acid methyl esters was studied using MCM-41 mesoporous silica-supported Pd-Pt bimetallic catalysts with tunable porosity under mild reaction conditions (100 C, 0.4 MPa H2, 4 h). This process produced partially hydrogenated fatty acid methyl esters (H-FAME) as a new type of highquality biodiesel fuel enriched in monounsaturated fatty acid methyl esters (mono-FAME), which is a potential source for formulating high blends of biodiesel fuel with petrodiesel. MCM-41 supports with various structural properties and morphologies were synthesized by self-assembly with different amounts of ammonia solution as a mineralizing agent. Bimetallic Pd-Pt nanoparticles with a Pd/Pt atomic ratio of 4 were stepwise impregnated on three MCM-41 supports, resulting in a series of Pd-Pt/MCM-41 bimetallic catalysts with tunable porosity (0.89-1.79 cm3 g-1), average pore size (3.2-8.5 nm), and particle size (0.12-0.62 mu m). The Pd-Pt/MCM-41 catalyst prepared with the least amount of ammonia produced the best partial hydrogenation conversion of polyunsaturated FAME into mono-FAME, ascribed to nano-aggregation resulting in a dual-pore system containing large pores for fast molecular diffusion; a high turnover frequency (1920 h-1), larger k1 rate constant (0.60 gcat- 1h- 1), and smaller k2 rate constant (0.37 gcat- 1h- 1) were obtained. Furthermore, this Pd-Pt/MCM-41 catalyst exhibited excellent sulfur resistance in the synthesis of H-FAME, even though the feedstocks contained approximately 5 ppm of sulfur contaminates. These results demonstrate that the sulfur-resistant Pd-Pt/MCM-41 bimetallic catalysts with stable and dual pore system are beneficial for obtaining higher quality BDF to reduce our reliance on fossil fuels.
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