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ITS » Paper and Presentation » Teknologi Proses - S2
Posted by aprill@is.its.ac.id at 29/09/2015 21:45:22  •  815 Views


STUDI PREPARASI NANOKATALIS 947-AL2O3 DENGAN METODE PRESIPITASI SERTA PENGGUNAANNYA DALAM PROSES PRODUKSI DIETIL ETER

STUDY ON PREPARATION OF NANOCATALYS -Al2O3 WITH PRECIPITAION METHOD AND ITS USE IN DIETHYL ETHER PRODUCTION PROCESS

Author :
WAHYUDI, ARIFUDDIN ( 2312 201 904 )




ABSTRAK

Perkembangan ilmu pengetahuan yang cukup pesat dewasa ini memberikan dampak yang cukup signifikan dalam pengembangan teknologi. Salah satunya adalah dalam pengembangan katalis. Untuk memaksimalkan efektifitas katalis berbagai teknologi telah dilakukan dalam rekayasa katalis salah satunya adalah pembuatan nanokatalis. Alumina terutama -alumina banyak digunakan sebagai katalis dan support katalis karena selain memiliki luas permukaan besar juga memiliki sisi aktif yang bersifat asam dan basa. Sisi aktif ini dihasilkan dari pelepasan molekul air. Dalam aplikasinya alumina banyak digunakan dalam pembuatan senyawa DiEtil Eter melalui proses dehidrasi senyawa etanol. Penelitian ini bertujuan untuk mempelajari proses preparasi nanokristalin -Al2O3 dengan metode presipitasi dan mempelajari pengaruh konsentrasi prekursor pelarut temperatur presipitasi dan waktu pengadukan terhadap -Al2O3 yang dihasilkan. Serta mempelajari aktifitas nanokatalis -Al2O3 pada proses produksi DiEtil Eter dari etanol. Tahap pertama penelitian ini adalah proses preparasi nanokatalis -Al2O3 dengan metode presipitasi menggunakan prekursor AlNO33.9H2O dan NH4OH sebagai agen pengendap. Pertama menyiapkan precursor dengan konsentrasi 0.2 0.3 0.4 0.5 dan 1 M dengan melarutkan AlNO33.9H2O kedalam pelarut HCl 0.5 M dan aquades. Kemudian menambahkan NH4OH kedalam larutan hingga pH9. Larutan diaduk selama 3 4 5dan 6 jam pada suhu 60 70 80 90 dan 100oC. Setelah itu mencuci presipitat dengan aquadest dan etanol lalu menyaring dan mengeringkan pada suhu 75oC selama 24 jam. Kemudian melakukan kalsinasi pada suhu 600oC dengan mengalirkan udara selama 6 jam. -Al2O3 yang dihasilkan dilakukan karakterisasi XRD untuk mengetahui kristalinitas dan ukuran kristalnya serta karakterisasi BET untuk mengetahui luas permukaan dan volume porinya. Tahap Kedua adalah uji aktifitas -Al2O3 pada proses produksi DiEtil Eter dari etanol melalui reaksi dehidrasi. Proses dehidrasi dilakukan pada reaktor fixbed dengan temperatur operasi 125 150 175 200 dan 225oC. Uap keluar reaktor dihubungkan dengan kondensor untuk mengkondensasikan produk reaksi yang kemudian akan dilakukan analisa gas chromatografi. Dari penelitian ini dapat diambil kesimpulan penggunaan pelarut HCl 0.5 M menghasilkan -Al2O3 dengan ukuran lebih kecil dibanding pelarut aquadest. Ukuran partikel yang dihasilkan berbanding lurus dengan konsentrasi precursor yang digunakan dan lamanya waktu pengadukan. Secara umum ukuran kristal -Al2O3 yang dihasilkan naik seiring dengan naiknya suhu presipitasi. Kondisi optimum dihasilkan pada suhu presipitasi 700C dimana menghasilkan ukuran partikel terkecil yakni 10.12907 nm. Secara umum katalis hasil preparasi dengan metode presipitasi PR-C menghasilkan konversi reaksi dan yield DEE yang lebih besar dibandingkan katalis -Al2O3 komersial. Konversi reaksi terbesar dihasilkan pada penggunaan katalis PR-C dengan suhu reaksi 2250C sebesar 94.7069 . Yield DEE terbesar dihasilkan pada penggunaan katalis PR-C dengan suhu reaksi 1750C sebesar 11.29 .


ABSTRACT

Development of science nowadays provide a significant impact in the development of technology. One of this impacat is the development of catalysts. To maximize the effectiveness of the catalyst there are many variety of engineering technology catalyst had been done one of them is syntesis of nanocatalyst. -Alumina is widely used as catalysts and catalyst supports in addition to having a large surface area -Alumina also has two active sides which are acidic and basic. The active sides resulted from the release of water molecules. In the application alumina is widely used in the produce of diethyl ether through ethanol dehydration process. This research aims to study the preparation process of nanocrystalline -Al2O3 with precipitation method and studied the effect of precursor concentration precipitation temperature and stirring time on - Al2O3 produced. As well as studying the -Al2O3 nanocatalyst activity in production of DiEthyl Ether from ethanol. The first step of this research is preparation process of nanocatalyst -Al2O3 by precipitation method using AlNO33.9H2O as precursors and NH4OH as the precipitating agent. First preparing the precursor with 0.2 0.3 0.4 0.5 and 1 M consentration by dissolving AlNO33.9H2O into 0.5 M HCl and distilled water as solvent. Then NH4OH added to the solution until solution pH is 9. The solution was stirred for 3 4 5 and 6 hours at a temperature 60 70 80 90 and 100C. After that washing the precipitate with distilated water and ethanol and then filtering and drying it at 75oC for 24 hours. Then it is calcined at 600oC by flowing air for 6 hours. The resulting of -Al2O3 is characterized by XRD to determine the crystallinity and crystal size and characterized by BET to determain surface area and pore volume . The second step is studiying the activity of -Al2O3 by DiEthyl Ether production process from ethanol through dehydration reaction. Dehydration process is carried out at the fixbed reactor with operating temperature 125 150 175 200 and 225 oC. The reactor outlet stream connected with condenser to condense the reaction product which will be analyzed by Gas Chromatography. From this research we can take conclusinons that using 0.5 M HCl as solvent are produced smaller -Al2O3 crystal size than using aquadest solution. The particle size which produced are equivalent with precursor consentration used and duration of agitating time. Generally crystal size of -Al2O3 which produced are equivalent with the rising of presipitation temperature. The optimum condition which can produce the smallest particle is at 700C with the crystal size of -Al2O3 is 10.12907 nm. Generally catalyst which prepared by presipitation methode PRC produce higher convertion of reaction and DEE yield than comercial catalyst REF-C. The highest convertion of reaction is resulted by PR-C catalyst using at 2250C reaction temperature as 94.7069. The highest DEE yield is resulted by PR-C catalyst using at 1750C as 11.29.



KeywordsPresipitasi; nanokatalis; ?-Al2O3; dietil eter
 
Subject:  Curah hujan kimia
Contributor
  1. Prof. Dr. Ir. Achmad Roesyadi, DEA
Date Create: 29/09/2015
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-paper-23121150007962
Collection ID: 23121150007962
Call Number: RTK 650.294 85 Wah s


Source
Paper and Presentations, Chemical Engineering, RTK 650.294 85 Wah s, 2015

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Copyright @2015 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library




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