CD Skripsi

Penggunaan Katalis Sio2 Dari Sabut Kelapa (Cocos Nucifera L.) Terimpregnasi Asam Sulfat Untuk Sintesis Biodiesel Dari Minyak Jelantah Variasi : Berat Katalis Dan Suhu Reaksi

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SUMMARY
Coconut husk (Cocos nucifera L.) is one of the most abundant parts produced by coconut plants and is an underutilized waste material. Coconut husk ash contains silica that has the potential to be used as a heterogeneous acid catalyst in biodiesel synthesis. The use of non-impregnated silica as a catalyst can pose problems in terms of activity, selectivity, and efficiency of chemical reactions. The addition of sulfuric acid is expected to modify the surface properties of silica, making it more acidic and enhancing catalytic effectiveness. The objective of this study was to modify the silica catalyst by adding H2SO4. The SiO2-H2SO4 catalyst was characterized using XRF to analyze chemical composition, XRD for phase identification of catalysts, BET to determine surface area, and FTIR to identify functional groups. The XRF analysis results showed that the addition of sulfuric acid to coconut husk ash led to a decrease in the content of alkali and alkaline earth oxides (CaO, K2O, MgO, Na2O), while the sulfur trioxide (SO3) and SiO2 content increased. The XRD analysis revealed two peaks of SiO2 at 2θ = 23° and 44°, with an additional peak for SiO2-H2SO4 at 2θ = 10°. This SiO2 phase indicated that the silica was in an amorphous form. The SiO2 catalyst had a surface area of 342 m2/g, a pore volume of 0.2157 cm3/g, and an average pore size of 1.2 nm. The addition of sulfuric acid increased the surface area to 337 m2/g, the pore volume to 0.2193 cm3/g, and the average pore size to 1.3 nm. FTIR analysis showed the presence of functional groups such as Si-OH, S-O (sulfonate), and Si-O stretch vibrations in Si-OH. Biodiesel synthesis was conducted using the SiO2-H2SO4 catalyst with variations in catalyst weight (5, 7, and 10 wt%), temperature (55 and 60°C), and oil-to-methanol molar ratio (1:12, 1:38, and 1:76). The research results showed a maximum biodiesel yield at a catalyst weight of 10 wt%, an oil-to-alcohol molar ratio of 1:76, and a temperature of 60°C, with a yield of 84.5%. GC-MS analysis revealed a methyl ester/alkyl ester purity of 90.3%. However, two parameters of the biodiesel characterization did not meet the SNI 7182-2015 standard, namely oxidation stability and methyl ester content.

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

1903112537

Penerbit

Pekanbartu : Universitas Riau - FMIPA - Kimia., 2023

Deskripsi Fisik

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Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

1903112537

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

PUJA

Versi lain/terkait

Lampiran Berkas

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