STUDI PENDAHULUAN PEMBUATAN DAN KARAKTERISASI NANOKATALIS NixMoyFe1-x-yO3±δ SERTA UJI AKTIVITAS PADA KONVERSI (CO2¬ + H2)

Muhammad Subari, 0817011043 (2014) STUDI PENDAHULUAN PEMBUATAN DAN KARAKTERISASI NANOKATALIS NixMoyFe1-x-yO3±δ SERTA UJI AKTIVITAS PADA KONVERSI (CO2¬ + H2). Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Lampung.

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Abstrak

ABSTRAK Telah dilakukan pembuatan dan karakterisasi nanokatalis NixMoyFe(1-x-y)O4 (x = 0,4 dan y = 0,1 – 0,3) dengan menggunakan metode sol-gel, sonikasi secara simultan dan freeze-dry dari bahan Fe-nitrat, Ni-nitrat dan Ammonium Heptamolibdat serta putih telur dalam medium aquades. Proses karakterisasi katalis meliputi analisis fase Kristal menggunakan difraksi sinar-X (XRD), jumlah situs asam menggunakan metode Gravimetri dan jenis situs asam menggunakan Spektrofotometri Infra Merah (FTIR), analisis morfologi permukaan menggunakan Scanning Electron Microscope (SEM) dan Metode Debye-Scherrer. Selanjutnya dilakukan uji aktivitas katalitik terhadap konversi gas CO2 + H2 pada rentang suhu 200 – 400oC dan hasil konversi dianalisis menggunakan kromatografi gas yang telah terintegrasi spektrometri massa (GC-MS). Hasil analisis fasa kristalin menggunakan difraksisinar-X (XRD) menunjukkan bahwa fasa kristalin paling dominan adalah NiMoO4, dan FeMoO4. Hasil analisis keasaman menggunakan metode Gravimetri menunjukan katalis Ni0.4Mo0.1Fe0.5O4 memiliki nilai keasaman tertinggi yaitu 0,895 mmol piridin/g katalis. Hasil analisis keasaman katalis NiyMoxFe(1-x-y)O4 menggunakan metode spektrofotometri inframerah menunjukkan bahwa intensitas relatif situs asam Lewis dan Brӧnsted-Lowry adalah sama. Morfologi permukaan katalis NixMoyFe(1-x-y)O4 yang dipreparasi belum homogen. Hasil perhitungan dengan menggunakan metode Debye-Scherrer, ukuran butiran katalis katalis Ni0.4Mo0.1Fe0.5O4, Ni0.4Mo0.2Fe0.4O4, dan Ni0.4Mo0.3Fe0.3O4 masing-masing adalah 53,64nm, 47,66 nm dan 43,22 nm. Hasil uji aktivitas katalis Ni0,4Mo0,1Fe0,5O4 terhadap konversi (CO2 + H2) pada suhu 400 oC menunjukkan bahwa katalis Ni0,4Mo0,1Fe0,5O4 aktif terhadap pembentukan etanol, propanol, dan butanol dengan persentase masing-masing yaitu 61,49%, 18,89%, dan 19,61%. Kata Kunci : Nanokatalis, sol-gel, freeze-dry, putih telur, konversi, CO2. ABSTRACT In this study, synthesis of NixMoyFe(1-x-y)O4 (x = 0,4 dan y = 0,1 – 0,3) was conducted using the combination of sol-gel, ultrasound agitation and freeze-dry method. The raw materials used are Fe-nitrate, Ni-nitrate and Ammonium Heptamolybdate dissolved in white egg solution. The catalysts were characterized by X-Ray Diffraction (XRD), gravimetry and infrared (IR) spectroscopy, Scanning Electron Microscope (SEM) and Debye-Scherrer Method. The activity test for CO2 and H2 conversion was carried out at temperature range of 200 – 400oC, then, the results were analyzed by Gas Chromatography-Mass Spectrometry (GC-MS). XRD analysis revealed that the nanocatalysts consist of some crystalline phases, with the majority phases are NiMoO4 and FeMoO4. By using gravimetry method, the acidity of Ni0.4Mo0.1Fe0.5O4 was obtained to be 0,895 mmol pyridine/gr catalyst which is higher than those of the others. The IR spectroscopy method showed that the nanocatalyst has both Lewis and Brӧnsted Lowry acid properties. The surface morphology of nanocatalysts is not homogen. The size of nanocatalysts which was calculated by Debye-Scherrer method showed that the size of Ni0.4Mo0.1Fe0.5O4, Ni0.4Mo0.2Fe0.4O4, and Ni0.4Mo0.3Fe0.3O4 are 53.64 nm, 47.66 nm and 43.22 nm, respectively. The activity test of Ni0,4Mo0,1Fe0,5O4 in CO2 and H2 conversion at 400 oC showed that nanocatalyst Ni0,4Mo0,1Fe0,5O4 was active to produce ethanol, propanol, and butanol with the percentage of 61.49%, 18.89%, and 19.61%, respectively. Keywords : Nanocatalyst, sol-gel, freeze-dry, egg white, conversion, CO2.

Tipe Karya Ilmiah: Skripsi
Subyek: A General Works = Karya Karya Umum
Program Studi: Fakultas MIPA > Prodi Kimia
Depositing User: Muhammad Subari Ari
Date Deposited: 23 Jan 2015 02:40
Last Modified: 23 Jan 2015 02:40
URI: http://digilib.unila.ac.id/id/eprint/6420

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