TY - JOUR
T1 - Metasilicate-based catalyst prepared from natural diatomaceous earth for biodiesel production
AU - Chen, Ying Chen
AU - Lin, Dai Ying
AU - Chen, Bing Hung
N1 - Funding Information:
This work was financially supported by the Ministry of Science and Technology , Taiwan ( MoST 105–2221–E–006–231 and MoST 106–2221–E–006–189–MY3 ). Appendix A
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/8
Y1 - 2019/8
N2 - In this study, natural diatomaceous earth was utilized for the preparation of efficient lithium metasilicate (Li2SiO3) catalyst for biodiesel production via the transesterification of soybean oil and waste cooking oil. Lithium metasilicate was successfully synthesized from the hydrothermal reaction of natural diatomite in LiOH solutions at 150 °C for 24 h and, subsequently, by calcination at 500 °C for 6 h. Both fresh and spent Li2SiO3 catalysts were characterized by using XRD, 29Si NMR, BET, ICP-OES and acid-base titration. The acidity of the soybean oil and waste cooking oil used in this study was 0.54 mg KOH/g oil and 1.67 mg KOH/g oil, respectively. The yields of biodiesel from soybean oil reached ca. 80.3% in 1 h, respectively, in presence of catalyst at 3 wt% of oil used. Generally, more catalyst present would lead to a higher yield of biodiesel. With the mass loading of catalyst-to-oil at 0.05, the activation energy of the catalyzed transesterification using Li2SiO3 catalyst was 61.65 kJ/mol. The durability test of the Li2SiO3 catalysts was conducted in the same system. A high catalytic activity after being reused for 19 times was observed with a yield of biodiesel near ca. 85% after 4 h of the transesterification reaction at 60 °C. The deactivation mechanism of the Li2SiO3 catalyst was mainly attributed to the loss of surface base sites coincident with more Q4 and less Q2 Si atoms in catalyst after reaction, as found by 29Si NMR.
AB - In this study, natural diatomaceous earth was utilized for the preparation of efficient lithium metasilicate (Li2SiO3) catalyst for biodiesel production via the transesterification of soybean oil and waste cooking oil. Lithium metasilicate was successfully synthesized from the hydrothermal reaction of natural diatomite in LiOH solutions at 150 °C for 24 h and, subsequently, by calcination at 500 °C for 6 h. Both fresh and spent Li2SiO3 catalysts were characterized by using XRD, 29Si NMR, BET, ICP-OES and acid-base titration. The acidity of the soybean oil and waste cooking oil used in this study was 0.54 mg KOH/g oil and 1.67 mg KOH/g oil, respectively. The yields of biodiesel from soybean oil reached ca. 80.3% in 1 h, respectively, in presence of catalyst at 3 wt% of oil used. Generally, more catalyst present would lead to a higher yield of biodiesel. With the mass loading of catalyst-to-oil at 0.05, the activation energy of the catalyzed transesterification using Li2SiO3 catalyst was 61.65 kJ/mol. The durability test of the Li2SiO3 catalysts was conducted in the same system. A high catalytic activity after being reused for 19 times was observed with a yield of biodiesel near ca. 85% after 4 h of the transesterification reaction at 60 °C. The deactivation mechanism of the Li2SiO3 catalyst was mainly attributed to the loss of surface base sites coincident with more Q4 and less Q2 Si atoms in catalyst after reaction, as found by 29Si NMR.
UR - http://www.scopus.com/inward/record.url?scp=85062146361&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85062146361&partnerID=8YFLogxK
U2 - 10.1016/j.renene.2019.02.054
DO - 10.1016/j.renene.2019.02.054
M3 - Article
AN - SCOPUS:85062146361
SN - 0960-1481
VL - 138
SP - 1042
EP - 1050
JO - Renewable Energy
JF - Renewable Energy
ER -
