Green biodiesel production from Nannochloropsis microalgae-derived oil using ZnAl-LDH catalyst: Process optimization and kinetic study

被引:6
作者
Atashkar, Hajar [1 ]
Saidi, Majid [1 ]
机构
[1] Univ Tehran, Coll Sci, Sch Chem, POB 14155-6455, Tehran, Iran
关键词
Biodiesel; Nannochloropsis microalgae; Layered double hydroxides structure; Kinetic modeling; Response surface methodology; LAYERED DOUBLE HYDROXIDE; MIXED OXIDES; TRANSESTERIFICATION; ESTERIFICATION; EXTRACTION; PROSPECTS; ACID;
D O I
10.1016/j.fuel.2024.131804
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The green production of biodiesel using Nannochloropsis microalgae, a renewable and environmentally friendly source, was successfully conducted by application of a calcined ZnAl layered double hydroxides structure (LDH) catalyst. The ZnAl-LDO catalyst was prepared through the urea synthesis method, followed by calcination at 400 degree celsius. XRD was used to investigate the crystallite characteristics, N-2 -BET to analyze surface properties and pore size, and CO2-TPD to identify the active basic sites strength. Bligh and Dyer's method was utilized for oil extraction with a yield of 38 %. Upon analyzing the fatty acid profile of derived oil, a synthetic oil containing oleic and palmitic acids was utilized in this process. The experiments were designed using the response surface methodology (RSM) method and the optimized parameters were obtained at 149.59 degree celsius, 118.92 min, 3.91 wt% catalyst loading, and 11.68:1 methanol to oil molar ratio for the biodiesel yield of > 98 %. The pseudo -first -order esterification reaction kinetic was investigated and the activation energy was determined to be 28.53 kJ.mol(-1). Furthermore, the process can be applied to microalgae solid biomass as well. In -situ transesterification of microalgae with a yield of FAME over 90 % also has been carried out.
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页数:14
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