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ITS » Undergraduate Theses » Teknik Kimia
Posted by budi at 15/01/2010 11:16:42  •  3445 Views


SINTESIS SILIKA AEROGEL BERBASIS WATERGLASS UNTUK PENYIMPAN HIDROGEN

SYNTHESIS SILICA AEROGEL BASED ON WATERGLASS FOR HYDROGEN STORAGE

Author :
PRAMUDITYO, ESAR; PERTIWI, MUSTIKA ENDAHING 




ABSTRAK

Penelitian ini bertujuan untuk mengembangkan penyimpan hidrogen berupa silika aerogel berbasis waterglass yang dikeringkan pada tekanan ambient dengan modifikasi permukaan dan didoping dengan berbagai ion logam. Karakter yang diinginkan adalah silika aerogel yang memiliki kapasitas adsorpsi yang besar volume pori yang besar dan bersifat hidrofobik. Untuk mensintesis silika aerogel pada penelitian ini digunakan metode solgel. Sintesis diawali dengan pembuatan larutan silicic acid yang diperoleh dari sodium silicate waterglass yang diencerkan dengan perbandingan tertentu kemudian dilewatkan dalam resin penukar ion. Larutan silicic acid ini kemudian ditambahkan dengan TMCS dan HMDS sebagai agen pemodifikasi permukaan. Doping logam diberikan sebelum penambahan modifikator permukaan tersebut. Setelah itu ditambahkan larutan basa dalam hal ini pyridine untuk menaikkan pH hingga 8 - 9. Gel yang dihasilkan kemudian di-aging dan dikeringkan dengan suhu dan waktu tertentu. Karakterisasi produk dilakukan dengan cara menghitung porositas dan volume pori menguji hidrofobisitasnya mengukur kapasitas adsorpsi hidrogennya serta melihat morfologinya. Silika aerogel yang dihasilkan berbentuk butiran kasar dan rapuh dengan ukuran maksimal 1 mm. Sifat fisik terbaik berupa porositas volume pori dan hidrofobisitas dimiliki silika aerogel yang disintesis dengan perbandingan volume SA TMCS HMDS 1 0015 006. Doping logam nikel dengan NiSi sebesar 01 memberikan hasil yang baik dan mampu meningkatkan daya adsorpsi silika aerogel terhadap hidrogen dari 529 tanpa doping hingga mencapai 567 berat. Sedangkan doping logam kobalt dan besi terbukti tidak mampu meningkatkan kapasitas adsorpsi silika aerogel terhadap hidrogen.


ABSTRACT

The main objective of this research is to develop a solid material for hydrogen storage in the form of silica aerogel based on waterglass synthesized with ambient pressure drying surface modification and metal ion doping. The developed material should have high adsorption capacity high pore volume and hydrophobic. To synthesize the silica aerogel in this research we used a sol-gel method. This synthesis began with preparing silicic acid solution by diluting sodium silicate waterglass and then passing it through the ion exchange resin. This silicic acid then was added with TMCS and HMDS as surface modifying agent. The doping of metal was given before the addition of those surface modifying agent. Base solution i.e pyridine was then added to raise the pH to 8 or 9. After that we aged and dried the resulted gel in certain temperature and time. Characterization of the products was done by calculating the porosity and pore volume testing their hydrophobicity observing their morphologies by SEM and measuring their adsorption capacity of hydrogen. The resulted silica aerogel are in the form of powder and brittle particles with maximum size of 1 mm. The best physical properties i.e porosity pore volume and hydrophobicity is occupied by the silica aerogel that is synthesized by volume ratio of SA TMCS HMDS 1 0015 006. Metal doping of nickel with molar ratio NiSi of 0.1 gives a great result and raise the hydrogen adsorption capacity of silica aerogel from 5.29 wt without doping to 5.67 wt. While the cobalt and iron doping is proved failed to raise the hydrogen adsorption of silica aerogel.



Keywordssilika aerogel; penyimpan hidrogen; modifikasi permukaan; pengeringan pada tekanan ambient; doping logam
 
Subject:  Absorbsi
Contributor
  1. Dr. Ir. Heru Setyawan, M.Eng
Date Create: 15/01/2010
Type: Text
Format: Pdf
Language: Indonesian
Identifier: ITS-Undergraduate-3100009035850
Collection ID: 3100009035850
Call Number: RSK 661.068 3 Pra s


Source
Undergraduate Theses, Chemical Engineering, RSK 661.068 3 Pra s,2009

Coverage
ITS Community Only

Rights
Copyright @2009 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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  1.  ITS-Undergraduate-7936-2305100032-2305100097-Abstract.pdf - 213 KB
  2.  ITS-Undergraduate-7936-2305100032-2305100097-Kesimpulan.pdf - 280 KB




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