Sintesis dan Karakterisasi Katalis Lantanum Seng Nikel Fosfat (LZNP) dan Uji Katalisisnya pada Reaksi Konversi Selulosa menjadi 5-Hidroksimetilfurfural

Arifin, Firda Khoirunnisha (2023) Sintesis dan Karakterisasi Katalis Lantanum Seng Nikel Fosfat (LZNP) dan Uji Katalisisnya pada Reaksi Konversi Selulosa menjadi 5-Hidroksimetilfurfural. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Katalis lantanum seng nikel fosfat (LZNP) telah disintesis dengan metode sol-gel, dengan Zn 0,050 mol dan variasi mol Ni = 0,000; 0,025; 0,050; 0,100 dan 0,150. Katalis hasil sintesis dikarakterisasi dengan TGA, difraksi sinar-X (XRD), FTIR, FTIR adsorpsi piridin, adsorpsi-desorpsi N2 dan SEM-EDX. Hasil karakterisasi menunjukkan bahwa katalis LZNP memiliki struktur kristal yang sama dengan LaPO4, yaitu heksagonal. Keasaman Lewis dari katalis meningkat dengan meningkatnya mol Ni, tetapi keasaman Brønsted dari katalis menurun. Adanya doping Ni dan Zn dapat meningkatkan luas permukaan katalis. Hasil SEM menunjukkan bahwa katalis lantanum fosfat (LP), lantanum seng fosfat (LZP) dan LZNP 0,100 berbentuk agregat dan ukuran pori tidak seragam. Uji katalisis dilakukan melalui reaksi selulosa menjadi 5-Hidroksimetilfurfural (5-HMF). Konversi, selektivitas dan yield 5-HMF tertinggi dicapai oleh katalis LZP dengan reaktan selulosa 90,73; 26,25; 23,81%, dengan reaktan glukosa 95,75; 80,47; 77,06%, dan dengan reaktan fruktosa 96,27; 87,82 dan 84,54%. Konversi, selektivitas dan hasil 5-HMF dari reaksi konversi selulosa, glukosa dan fruktosa dipengaruhi oleh rasio keasaman katalis Brønsted/Lewis. Hasil uji katalisis menunjukkan bahwa pembentukan 5-HMF dari selulosa dengan katalis LZNP melalui tiga tahapan yaitu pembentukan glukosa dan fruktosa terlebih dahulu melalui hidrolisis, isomerisasi glukosa menjadi fruktosa dan dehidrasi fruktosa menjadi 5-HMF.
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Lanthanum zinc nickel phosphate (LZNP) catalyst were synthesized using the sol-gel method, with Zn at 0.050 mol and Ni in amounts of 0.000; 0.025; 0.050; 0.100 and 0.150 mol. The synthesized catalysts were characterized by TGA, X-ray diffraction (XRD), FTIR, pyridine adsorption FTIR, N2 adsorption-desorption and SEM-EDX. The characterization results revealed that the crystal structure of LZNP is hexagonal, similar to that of LaPO4. As the amounts of Ni increased, the Lewis acidity of the catalyst increased while the Brønsted acidity decreases. The presence of Ni and Zn doping can increase the surface area of the catalyst. The scanning electron microscopy (SEM) results showed that the catalysts lanthanum phosphate (LP), lanthanum zinc phosphate (LZP), and LZNP 0.100 formed aggregates with irregular pore sizes. The catalytic performance was evaluated by testing the reaction of cellulose to produce 5-Hidroxymethylfurfural (5-HMF). The LZP catalyst showed the highest conversion, selectivity, and yield of 5-HMF, with 90.73, 26.25, and 23.81% respectively for cellulose, 95.75, 80.47, and 77.06% for glucose, and 96.27, 87.82 and 84.54% for fructose. The conversion, selectivity and yield of 5-HMF from the conversion reaction of cellulose, glucose and fructose are affected by the acidity ratio of the Brønsted/Lewis catalyst. The results of the catalytic test indicated that the formation of 5-HMF from cellulose with LZNP catalyst involved three stages: hydrolysis to form glucose and fructose, isomerization of glucose to fructose, and dehydration of fructose to produce 5 HMF.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Katalis heterogen, lantanum fosfat, Ni-Zn doping dan 5-hidroksimetilfurfural Heterogeneous catalyst, lanthanum phosphate, Ni-Zn doping dan 5-hidroxymethylfurfural
Subjects:	Q Science > QD Chemistry > QD320 Cellulose. Hydrolysis Q Science > QD Chemistry > QD501 Catalysis. Catalysts.
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47101-(S2) Master Thesis
Depositing User:	Firda Khoirunnisha Arifin
Date Deposited:	13 Feb 2023 02:21
Last Modified:	13 Feb 2023 02:21
URI:	http://repository.its.ac.id/id/eprint/96941

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