STUDI PENDAHULUAN KONVERSI SELULOSA MENJADI GULA ALKOHOL MENGGUNAKAN NANOKATALIS LaCrO3

Lolita Napatilova Albert Kahar, 1017011039 (2015) STUDI PENDAHULUAN KONVERSI SELULOSA MENJADI GULA ALKOHOL MENGGUNAKAN NANOKATALIS LaCrO3. FAKULTAS MATEMATIKA DAN ILMU PENGETAHUAN ALAM, UNIVERSITAS LAMPUNG.

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Abstrak

ABSTRAK INDONESIA Telah dilakukan preparasi nanokatalis LaCrO3 dengan metode sol gel dan pelarut pektin pada temperatur kalsinasi 600 dan 700 ºC serta uji aktivitas katalitiknya dalam konversi selulosa menjadi gula alkohol. Karakterisasi katalis meliputi analisis keasaman, analisis ukuran partikel (PSA), analisis morfologi katalis (TEM) dan analisis fasa kristalin (XRD). Selanjutnya, hasil uji katalitik konversi selulosa dianalisis menggunakan LCMS. Hasil analisis keasaman katalis LaCrO3 yang dikalsinasi pada temperatur 600 dan 700 ºC sebesar 1,0599 dan 1,1554 mmol piridin/gram katalis dengan jenis situs asam dari keduanya yaitu situs asam Lewis. Ukuran partikel pada rentang 0 – 100 nm dari katalis LaCrO3 yang dikalsinasi pada temperatur 600 dan 700 ºC memiliki distribusi volum kumulatif sebesar 21,91% dan 86,40%. Hasil analisis morfologi dari kedua katalis menunjukkan masih banyak aglomerasi dan diperoleh ukuran rata-rata partikel dari lima spot pada katalis LaCrO3 pada kalsinasi 600 dan 700 ˚C sebesar 34,59 dan 30 nm. Analisis XRD dari katalis yang dikalsinasi pada temperatur 700 ºC murni membentuk fasa kristalin LaCrO3 dengan ukuran rata-rata partikel yang dihasilkan dari persamaan Scherrer sebesar 21,45 nm. Sebanyak 16,66% selulosa berhasil dikonversi dengan bantuan katalis LaCrO3 yang dikalsinasi pada temperatur 700 ºC menjadi sukrosa dan sorbitol atau manitol. Kata kunci: nanokatalis, selulosa, gula alkohol, pektin ABSTRAK INGGRIS Sol gel preparation of LaCrO3 nanocatalyst using pectin as emulsifying agent which is calcined at 600 and 700 ˚C, respectively and catalytic test for cellulose to alcohol sugar have been studied. Then, the calcined materials were characterized using PSA to determine the particle size distribution, XRD to evaluate the phase composition, TEM to analyze the morphology and suface structure in 3-D, and FTIR to analyze the existence of both Lewis and Brönsted-Lowry acid sites. Furthermore, the result of catalytic tests were analyzed using LCMS. PSA proved that particle size of catalyst calsined at 600 and 700 ˚C respectively has a nano-size with cummulative distribution of 21,91% and 86,40%. FTIR analysis revealed that Lewis acid site is the prominent. The TEM result showed that there were aglomeration. Then, XRD result poved that sample calcined at 700 ˚C has a single crystalline phase of LaCrO3 and has a particle size of 21,45 nm. Calculated by Scherrer equation. The catalytic test proved that LaCrO3 is active to convert cellulose into sucrose, sorbitol and mannitol, with conversion of 16,66%. Key words: nanocatalyst, cellulose, alcohol sugar, pectin

Tipe Karya Ilmiah: Skripsi
Subyek: Q Science (General) > QD Chemistry
Program Studi: Fakultas MIPA > Prodi Kimia
Depositing User: 6782052 . Digilib
Date Deposited: 29 Oct 2015 02:44
Last Modified: 29 Oct 2015 02:44
URI: http://digilib.unila.ac.id/id/eprint/14202

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