Malaysian Journal of Analytical Sciences Vol 20 No 6 (2016): 1286 - 1298

DOI: http://dx.doi.org/10.17576/mjas-2016-2006-07

 

 

 

The Influence of Calcination Temperature on Iron Oxide  (α-Fe₂O₃) towards CO₂ Adsorption Prepared by Simple Mixing Method

 

(Kesan Suhu Pengkalsinan Ferum Oksida (α-Fe₂O₃) Disediakan Melalui Kaedah Campuran Ringkas Terhadap Penjerapan CO₂)

 

Azizul Hakim¹*, Mohd. Ambar Yarmo¹, Tengku Sharifah Marliza^1,2, Maratun Najiha Abu Tahari¹,

Wan Zurina Samad¹, Muhammad Rahimi Yusop¹, Mohamed Wahab Mohamed Hisham¹, Norliza Dzakaria^1,3

 

¹Catalysis Research Group, School of Chemical Sciences and Food Technology, Faculty of Science and Technology,

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

²Catalysis Science and Technology Research Centre, Faculty of Science,

Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia

³School of Chemistry and Environmental, Faculty of Applied Science,

University Teknologi Mara (UiTM) Negeri Sembilan,

Kampus Kuala Pilah, Pekan Parit Tinggi, 72000 Kuala Pilah, Negeri Sembilan, Malaysia

 

*Corresponding author: azizulhakim2442@gmail.com

 

 

Received: 7 February 2016; Accepted: 3 July 2016

 

 

Abstract

Synthesized iron oxide, α-Fe₂O₃ used for CO₂ capturing was prepared by a simple mixing method and calcined at temperatures in a range of 350 – 850 °C. CO₂ adsorption isotherms at 25 °C and 1 atm found that the sample namely s450 that calcined at 450 °C gave the highest CO₂ adsorption activity with the adsorption capacity of 17.0 mg_CO2/g_adsorbent. Monodentate carbonate, bidentate carbonate and bicarbonates formation were observed on s450 through the IR spectra. The basicity of s450 was identified by chemisorption of CO-TPD which contains weak, medium and strong basic sites with CO total adsorbed amount of 1.99 cm³/g.  It was found that s450 calcined at 450 °C has certain crystallite peaks that abruptly increased through the XRD diffractogram. The texture properties of s450 generated high porosity and more uniform sphere shape particle size with high surface area (50.5 m²/g). Furthermore, it is composed of trimodal distribution for pore size distribution curve desirable for CO₂ adsorption.

 

Keywords:  CO₂ capture, adsorption, iron oxide, solid adsorbent, porosity

 

Abstrak

Penjerapan CO₂ terhadap ferum oksida, α-Fe₂O₃ yang disintesis melalui kaedah campuran ringkas dan dikalsin pada suhu 350-850 °C. Penjerapan isoterma CO₂ pada suhu bilik, 25 °C and 1 atm mendapati sampel s450 yang dikalsin pada suhu 450 °C menunjukkan aktiviti penjerapan CO₂ paling tinggi dengan keupayaan penjerapan sebanyak 17.0 mg_CO2/g_penjerap. Spektrum IR telah membuktikan pembentukan spesis monodentat karbonat, bidentat karbonat dan bikarbonat pada s450. Sifat bes s450 yang dikenalpasti menggunakan jerapan kimia CO-TPD dimana jumlah CO yang dijerap oleh tapak bes lemah, sederhana dan kuat adalah 1.99 cm³/g.  Difraktogram XRD pula menunjukkan terdapat beberapa puncak kekisi yang meningkat. Tekstur s450 pula mempunyai keporosan yang tinggi dan bentuk sfera yang lebih sekata serta luas permukaan yang tinggi (50.5 m²/g). Tambahan lagi, graf taburan saiz liang s450 juga terdiri daripada taburan jenis trimodal yang menjadi salah satu faktor penting dalam penjerapan CO₂.

 

Kata kunci:  penjerapan CO₂, penjerapan, ferum oksida, penjerapan pepejal, keporosan

 

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