Journal
ACS OMEGA
Volume 7, Issue 11, Pages 9130-9141Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.1c04912
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Funding
- Thailand Research Fund (TRF) from the Thailand Research Fund (TRF) [PHD/0142/2557]
- Thai German S&T Cooperation 3rd Researcher Mobility
- Science Achievement Scholarship of Thailand
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This study aims to compare the physicochemical properties and catalytic performance of potassium supported on zeolite NaX and NaY prepared by ultrasound-assisted impregnation. The results showed that K/NaX is more stable and active compared to K/NaY, especially in the decomposition of MBOH.
This work aims to compare physicochemical properties and catalytic performance of potassium supported on zeolite NaX and NaY (K/NaX and K/NaY, respectively) prepared by ultrasound-assisted impregnation from potassium acetate buffer precursor. Calcination converts the potassium precursor to carbonate, which occupies the zeolite cavities and disperses on the external surface. Both calcined samples show a decrease in zeolite phases, BET surface areas, and pore volumes. With the smaller changes, K/NaX is more stable than K/NaY. Moreover, K/NaX has higher basicity than K/NaY and is more active in the decomposition of 2-methylbut-3-yn-2-ol (MBOH), producing dominant products from basic sites. Both K/NaX and K/NaY are active in the transesterification of palm oil, producing more than 94% of the biodiesel yields in the first run. However, the yields drop in the second run because of the leaching of potassium species into glycerol and biodiesel products. The spent K/NaX has a similar phase to the fresh one, whereas the spent K/NaY shows more structure collapse. With better structural stability, less potassium leaching, and less decline in biodiesel yields in the second run, K/NaX is a better catalyst than K/NaY.
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