Aliyatulmuna, Adilah (2017) Konversi Metana Menjadi Syngas Dengan Katalis Oksida Perovskit La₁₋ₓSrₓCo₁₋ᵧFeᵧO₃±δ Melalui Oksidasi Parsial - Methane Conversion To Syngas Over La₁₋ₓSrₓCo₁₋ᵧFeᵧO₃±δ Perovskite Oxide Catalysts Under Partial Oxidation Mechanism. Doctoral thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kedua seri senyawa La1-xSrxCo0,8Fe0,2O3±δ mulai dari x = 0 sampai dengan
0,4 dan senyawa La0,7Sr0,3Co1-yFeyO3δ mulai dari y = 0 sampai dengan 0,4 telah
berhasil disintesis dengan metoda solid state. Karakterisasi senyawa pertama
La1-xSrxCo0,8Fe0,2O3±δ menunjukkan semakin besar subtitusi Sr terhadap lantanum
semakin besar persentase penyusutan, kekerasan, konduktivitas elektrik, fluks ion
oksigen, volume kristal, oksigen nonstoikiometri (0,2≤x≤0,4), semakin tinggi
koefisien ekspansi termal (0,2≤x≤0,4) dan semakin panjang rusuk sel kristal
sedangkan ukuran partikel, kristalinitas, oksigen nonstoikiometri (x≤0,2) semakin
kecil dan koefisien ekspansi termal (x≤0,2) semakin rendah. Karakterisasi
senyawa kedua La0,7Sr0,3Co1-yFeyO3δ menunjukkan semakin besar substitusi ion
Fe terhadap Co semakin besar konduktivitas elektrik, volume kristal, oksigen
nonstoikiometri (0,2≤x≤0,4) dan semakin panjang rusuk sel kristal sedangkan
persentase penyusutan, kekerasan, ukuran partikel, kristalinitas, fluks ion oksigen
semakin kecil dan koefisien ekspansi termal semakin rendah. Uji aktivitas katalis
dibuktikan melalui pembentukan syngas dari reaksi oksidasi parsial metana tanpa
adanya gas oksigen pada suhu 950°C. Seri senyawa La1-xSrxCo0,8Fe0,2O3±δ
menunjukkan semakin banyak lantanum yang tersubstitusi oleh strontium semakin
besar selektivitas terhadap CO maupun H2 sedangkan konversi CH4, selektivitas
terhadap CO2 dan rasio H2/CO semakin kecil. Seri senyawa kedua
La0,7Sr0,3Co1-yFeyO3δ menunjukkan semakin besar kobalt yang tersubstitusi oleh
besi semakin besar konversi metana dan selektivitas terhadap CO dan H2
sedangkan selektivitas CO2 dan rasio H2/CO semakin kecil.
============================================================Both series of compounds La1-xSrxCo0,8Fe0,2O3±δ ranging from x = 0 to 0.4
and compound La0,7Sr0,3Co1-yFeyO3δ ranging from y = 0 to 0.4 had been
successfully synthesized by the method of solid state. Characterization of the first
series compound showed the more the Sr substitution of La in the
La1-xSrxCo0,8Fe0,2O3±δ the larger the shrinkage, the hardness, the electrical
conductivity, the oxygen flux, the crystal cell volume, the oxygen
nonstoichiometry (0,2≤x≤0,4), the higher the hardness and the thermal expansion
coefficient (0,2≤x≤0,4), the smaller the particle size, the crystallinity, the oxygen
nonstoichiometry (x≤0,2) and the coefficient of thermal expansion (x≤0,2). Also,
Sr substitution for La increased the unit cell length. The characterization of the
second compounds showed the more the Fe substitution of Co in the
La0,7Sr0,3Co1-yFeyO3δ the greater the electrical conductivity, the crystal cell
volume, the oxygen nonstoichiometry (0,2≤x≤0,4), the smaller the shrinkage,
hardness, particle size, crystallinity, the oxygen flux and the lower the coefficient
of thermal expansion. Besides, Fe substitution for Co led to the increase the unit
cell length of La0,7Sr0,3Co1-yFeyO3δ. The catalyst activity test was evidenced by
the formation of syngas from partial oxidation of methane in the absence of
oxygen at a temperature of 950°C. The La1-xSrxCo0,8Fe0,2O3±δseries showed the
more La partially substituted by Sr the greater the selectivity to CO and H2, the
smaller the CH4 conversion, the selectivity to CO2 and the ratio of H2/CO. The
La0,7Sr0,3Co1-yFeyO3δ series showed the more Co partially substituted by Fe the
greater the conversion of methane, selectivity to CO and the smaller the selectivity
to CO2 and the ratio of H2/CO.
| Item Type: | Thesis (Doctoral) |
|---|---|
| Additional Information: | RDKi 543.089 6 Ali k |
| Uncontrolled Keywords: | substitusi Sr, substitusi Fe, rasio H2/CO, Sr substitution, Fe substitution, H2/CO ratio |
| Subjects: | T Technology > TP Chemical technology > TP350 Natural gas--Drying. |
| Divisions: | Faculty of Mathematics and Science > Chemistry > 47001-(S3) PhD Thesis |
| Depositing User: | ansi aflacha |
| Date Deposited: | 03 Dec 2018 03:28 |
| Last Modified: | 03 Dec 2018 06:04 |
| URI: | http://repository.its.ac.id/id/eprint/60060 |
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