Journal
WASTE MANAGEMENT
Volume 95, Issue -, Pages 584-592Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2019.05.042
Keywords
MgO; Cerium-doped MCM-41; Surface evolution; Waste cooking oil; Biodiesel
Categories
Funding
- Iran Nanotechnology Initiative Council
- Sahand University of Technology
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In the present work, Mobil Composite Material no. 41 (MCM-41) utilized as the catalyst support for biodiesel production from Waste Cooking Oil (WCO). Different amounts of Si/Ce molar ratios (5, 10, 25, 50 and Ce = 0) introduced to the MCM-41 structure to synthesize the bifunctional nanocatalysts and achieve a modified support of high stability and acidity. Then, ultrasound used to disperse MgO active phase on support surface. The prepared nanocatalysts were investigated using various techniques as follows: XRD, EDX, TEM, FESEM, FTIR and BET. The XRD patterns along with the results of FTIR and BET analysis revealed the MCM-41 framework destruction while increasing the Ce content. The FESEM images of the nanocatalysts illustrated a well distribution and uniform morphology for the Mg/CeM (Si/Ce = 10). The particle size and size distribution of the Mg/CeM (Si/Ce = 10) were subsequently determined by TEM and FESEM images. Biodiesel production carried out under following constant operational parameters to evaluate catalytic performance of synthesized samples: T = 70 degrees C, catalyst loading = 5 wt%, methanol/oil molar ratio = 9, and 6 h reaction time. Ce substitution in support framework considerably enhanced the biodiesel conversion. The Mg/CeM (Si/Ce = 10) nanocatalyst demonstrated the highest conversion of 94.3%. The reusability of the Mg/CeM (Si/Ce = 10) studied in seven reaction cycles and biodiesel conversion reached to 88.7% at the end of seventh cycle which demonstrated its significant stability. (C) 2019 Published by Elsevier Ltd.
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