Tualaka, Trivena (2021) Sintesis Dan Karakterisasi Katalis Dari Fluorinasi Campuran Zn-Metoksida Dan Cu-Metoksida Dengan Metode Sol-Gel Serta Kinerja Katalis Dalam Konversi Α-Selulosa Menjadi Asam Laktat. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pada penelitian ini katalis hasil fluorinasi campuran Zn-metoksida dan Cu metoksida telah disintesis dengan metode sol-gel dan dilakukan karakterisasi untuk mengetahui struktur kristal, ikatan kimia, keasaman, luas permukaan, morfologi katalis dan distribusi unsur-unsur. Hasil XRD menunjukkan bahwa proses doping ion Cu2+ telah berhasil dilakukan dan memiliki struktur kristal heksagonal dan orthorombik. Spektrum FTIR menunjukkan bahwa katalis hasil sintesis memiliki ikatan Zn-O-H; O-H; Zn-O dan Zn-F. Foto SEM menunjukkan bahwa katalis memiliki morfologi yang tidak beraturan dan mengandung unsur O, F, Cu dan Zn. Selain itu katalis hasil sintesis diketahui memiliki luas permukaan antara 8,542 26,666 m2/g dan memiliki sisi asam Lewis dan Brønsted pada permukaannya, dengan sisi asam Brønsted yang lebih banyak dibandingkan dengan sisi asam Lewis. Kinerja katalis hasil sintesis diuji melalui reaksi konversi masing-masing α selulosa dan glukosa menjadi asam laktat dengan pelarut HCl 0,03%. Uji reaksi dengan reaktan awal α selulosa pada katalis hasil sintesis diperoleh nilai konversi tertinggi sebesar 99,13% dengan yield asam laktat sebesar 73,01% dan selektivitas asam laktat sebesar 82,44%. Adapun reaksi dengan reaktan awal glukosa diperoleh konversi tertinggi sebesar 98,11% dengan yield asam laktat sebesar 76,26% dan selektivitas asam laktat sebesar 78,30%. Rute reaksi yang terjadi tidak secara berurutan (consecutive) yang berarti asam laktat yang dihasilkan tidak selalu melewati pembentukan glukosa.
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In this study, the fluorinated catalyst of a mixture of Zn-methoxide and Cu methoxide was synthesized by the sol-gel method and characterization was carried out to determine the crystal structure, chemical bonds, acidity, surface area, catalyst morphology and distribution of elements. XRD results show that the Cu2+ ion doping process has been successfully carried out and has a hexagonal and orthorhombic crystal structure. The FTIR spectrum showed that the synthesized catalyst had Zn-O-H; O-H; Zn-O, and Zn-F bonds. SEM photos showed that the catalyst has an irregular morphology and contains elements of O, F, Cu, and Zn. In addition, the synthesized catalyst was known to have a surface area between 8,542 to 26,666 m2/g and had Lewis and Brønsted acid sites on its surface, with more Brønsted acid side than Lewis acid side. The performance of the synthesized catalyst was tested through the conversion reaction of α-cellulose and glucose to lactic acid with 0.03% HCl as solvent. The reaction test with the initial reactant α cellulose on the synthesized catalyst obtained the highest conversion value of 99.13% with lactic acid yield of 73.01% and lactic acid selectivity of 82.44%. The reaction with the initial reactant glucose obtained the highest conversion of 98.11% with lactic acid yield of 76.26% and lactic acid selectivity of 78.30%. The route of the reaction that occurs is not consecutive, which means that the lactic acid produced does not always pass through the formation of glucose.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Kata Kunci: Padatan berfluorinasi, metode sol-gel, Selulosa, Glukosa, Asam Laktat, dan Doping "========================================================" Keywords: Fluorinated solid, sol-gel method, α-Cellulose, Glucose, Lactic Acid, and Doping |
| Subjects: | Q Science > QD Chemistry > QD501 Catalysis. Catalysts. |
| Divisions: | Faculty of Science and Data Analytics (SCIENTICS) > Chemistry |
| Depositing User: | Trivena Tualaka |
| Date Deposited: | 14 Aug 2021 13:16 |
| Last Modified: | 14 Aug 2021 13:16 |
| URI: | http://repository.its.ac.id/id/eprint/86483 |
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