Pengaruh Penambahan Cerium (Ce) Dan Stronsium (Sr) Terhadap Karakteristik Oxygen Carrier Fe2O3/Al2O3 Dalam Konversi CO2 Menjadi CO Melalui Proses Chemical Looping

Ramadani, Muhamad Iqbal and Singgih, Janetta Caroline (2026) Pengaruh Penambahan Cerium (Ce) Dan Stronsium (Sr) Terhadap Karakteristik Oxygen Carrier Fe2O3/Al2O3 Dalam Konversi CO2 Menjadi CO Melalui Proses Chemical Looping. Diploma thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Konversi CO2 menjadi CO melalui proses chemical looping merupakan pendekatan potensial dalam pemanfaatan CO2 karena memisahkan tahap reduksi dan oksidasi sehingga proses lebih selektif. Namun, kinerjanya sangat ditentukan oleh karakteristik oxygen carrier, terutama kemampuan melepas dan mengambil kembali oksigen kisi. Fe2O3/Al2O3 banyak dikaji sebagai oxygen carrier, tetapi masih memiliki keterbatasan akibat pembentukan FeAl2O4 yang dapat menurunkan reaktivitas redoks. Penelitian ini bertujuan mengevaluasi pengaruh penambahan cerium (Ce) dan strontium (Sr) terhadap karakteristik fisikokimia, performa redoks, dan kinetika oxygen carrier Fe2O3/Al2O3 dalam konversi CO2 menjadi CO. Material F20-Al, F20Ce-Al, dan F20Sr-Al disintesis melalui impregnasi bertahap, kemudian dikarakterisasi menggunakan XRF, XRD, BET, SEM-EDX, TPR-TPO, TPD, serta diuji menggunakan TGA/DTG pada reduksi H2 dan oksidasi CO2. Hasil XRF menunjukkan F20Ce-Al mengandung 20,02% Fe dan 0,99% Ce, sedangkan F20Sr-Al mengandung 21,91% Fe dan 0,69% Sr. F20Ce-Al memiliki luas permukaan tertinggi sebesar 56,01 m²/g, desorpsi CO₂ tertinggi sebesar 1,930 mmol, konsumsi H2 dan O2 tertinggi sebesar 0,006 mmol/g dan 0,458 mmol/g, serta weight gain oksidasi terbesar sebesar 4,0%. Pemodelan kinetika menunjukkan mekanisme reduksi dan oksidasi paling sesuai mengikuti nucleation model dengan nilai R2 mendekati 1. Secara keseluruhan, F20Ce-Al merupakan oxygen carrier paling potensial karena menunjukkan karakteristik permukaan, aktivasi CO2, performa oksidasi, dan stabilitas redoks yang terbaik.
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The conversion of CO2 into CO through a chemical looping process is a promising approach for CO2 utilization because it separates the reduction and oxidation steps, thereby enabling a more selective process. However, its performance is strongly governed by the characteristics of the oxygen carrier, particularly its ability to release and reuptake lattice oxygen. Fe2O3/Al2O3 has been widely investigated as an oxygen carrier; however, it still faces limitations due to the formation of FeAl2O4, which can decrease redox reactivity. This study aims to evaluate the effect of cerium (Ce) and strontium (Sr) addition on the physicochemical characteristics, redox performance, and reaction kinetics of Fe2O3/Al2O3 oxygen carriers for CO2 conversion to CO. F20-Al, F20Ce-Al, and F20Sr-Al materials were synthesized using a stepwise impregnation method and subsequently characterized using XRF, XRD, BET, SEM-EDX, TPR-TPO, and TPD. Their redox performance was evaluated using TGA/DTG during H2 reduction and CO2 oxidation. XRF results showed that F20Ce-Al contained 20.02% Fe and 0.99% Ce, while F20Sr-Al contained 21.91% Fe and 0.69% Sr. F20Ce-Al exhibited the highest surface area of 56.01 m2/g, the highest CO2 desorption of 1.930 mmol, the highest H2 and O2 consumption of 0.006 mmol/g and 0.458 mmol/g, respectively, and the highest oxidation weight gain of 4.0%. Kinetic modeling indicated that the reduction and oxidation mechanisms were best described by the nucleation model, with R2 values close to 1. Overall, F20Ce-Al was identified as the most promising oxygen carrier because it exhibited the best surface characteristics, CO2 activation ability, oxidation performance, and redox stability

Item Type:	Thesis (Diploma)
Uncontrolled Keywords:	Karbon Dioksida, Karbon Monoksida, Oxygen Carrier, Chemical looping, Carbon dioxide, Carbon Monoxide, Oxygen carrier, Chemical looping
Subjects:	T Technology > TP Chemical technology > TP155.7 Chemical processes.
Divisions:	Faculty of Vocational > 24305-Industrial Chemical Engineering Technology
Depositing User:	Muhamad Iqbal Ramadani
Date Deposited:	30 Jul 2026 03:28
Last Modified:	30 Jul 2026 03:28
URI:	http://repository.its.ac.id/id/eprint/139949

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