Synthesis and Initial Evaluation of Solid Acid Catalyst Derived from Spent Coffee Grounds for the Esterification of Oleic Acid and Methanol.

Autor: Agapay, Ramelito C., Liu, Hsin-Chen, Ju, Yi-Hsu, Go, Alchris Woo, Angkawijaya, Artik Elisa, Nguyen, Phuong Lan Tran, Truong, Chi Thanh, Quijote, Kristelle L.
Zdroj: Waste & Biomass Valorization; Aug2021, Vol. 12 Issue 8, p4387-4397, 11p
Abstrakt: Spent coffee grounds (SCGs) were utilized in the synthesis of a solid acid catalyst (SAC) through a carbonization–sulfonation process performed at low temperatures (350–500 °C for carbonization and 50–150 °C for sulfonation) and short processing times (1–10 h). The best SAC from the process was able to convert more than 90% of oleic acid to methyl oleate during esterification with methanol (10 mol OA/mol methanol, 80 °C, 7 h, 10%w/w catalyst loading). It was obtained by carbonizing SCG at 400 °C for 2 h and then sulfonating the biochar at 100 °C for 1 h. The reusability tests performed in 4 cycles at the same esterification conditions reveal loss of activity of about 70% of its original state, corresponding to a decrease in total acid and sulfonic acid densities from 4.22 and 3.36 mmol H+/g to 1.33 and 1.16 mmol H+/g, respectively. This process is a considerable improvement from that reported in previous works, having no activating agents in the carbonization process and with significantly shorter times for processing. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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