SiO2 beads decorated with SrO nanoparticles for biodiesel production ...

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Electronic Supplementary Information, ESI

SiO2 beads decorated with SrO nanoparticles for biodiesel production from waste cooking oil using microwave irradiation Alex Tangy,a Indra Neel Pulidindi,a and Aharon Gedankena,b* a

Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel and

b

Department of Materials Science and Engineering, National Cheng Kung University, Tainan

70101, Taiwan Tel: +972-3-5318315; Fax: +972-3-7384053; *E-mail: [email protected]

Figure S1. Modified domestic microwave oven

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SrO SrCO3

16000

Intensity (a.u.)

12000

8000

4000

0 10

20

30

40 50 2θ (degree)

60

70

Figure S2. The XRD pattern of the material obtained after calcination of SrCO3@SiO2 at 900 °C for 2 h in air

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Sr(OH)2

SrCO3

SrO

Intensity (a.u.)

5 min.

3 min. 1 min.

30 sec.

10

20

30

40 50 2θ (degree)

60

70

Figure S3. The effect of calcination temperature (900 °C, 3 h) on the conversion of SrCO3@SiO2 to SrO@SiO2

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Figure S4. The XRD pattern of commercial SrO (standard) from Sigma-Aldrich

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Figure S5. Pictorial representation of the catalyst (SrO@SiO2) preparation under microwave irradiation

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Figure S6. Product obtained from the transesterification reaction

Figure S7. A typical 1H NMR of FAME obtained from transesterification of cooked oil with SrO@SiO2 yielding 99.4 wt. % conversion

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