Alumina teraktif telah disintesiskn dengan natrium hydroxide dan ia telah digunakan untuk penjerapan lapisan tetap karbon dioksida daripada aliran gas (15% CO2 dan selebihnya dengan N2). Alumina teraktif telah dikaji pada keadaan yang berbeza seperti peratusan natrium hidroksida (0, 10, 20, 30, 40 dan 50%), suhu pengkalsinan (200, 300, 400 dan 500 °C) dan masa pengkalsinan (2, 3 and 4 jam). 30% natrium hidroksida/alumina teraktif telah dikalsinkan pada 500 °C selama 4 jam telah mencapai penjerapan yang paling tinggi (51.92 mg CO2/g penjerap). Sifat-sifat permukaan, morfologi permukaan dan struktur kristal alumina teraktif masing-masing telah dicirikan dengan menggunakan BET, SEM, FTIR and XRD. Penjerapan lapisan tetap karbon dioksida telah dikaji pada keadaan yang berbeza seperti suhu penjerapan (35, 45 dan 55 °C ±1), jumlah kadar aliran masuk (90, 120 dan 150 mL/min), peratusan karbon dioksida masuk (12, 15 dan 18%), jumlah berat alumina teraktif (2, 4 dan 6 g) dan saiz zarah alumina teraktif (1-2 and 3-4 mm). Selepas itu, lengkung bulus telah diwujudkan pada keadaan penjerapan yang berbeza. Keputusan penjerapan menunjukkan bahawa 15% kepekatan CO2 masuk, 90 mL/min jumlah kadar aliran masuk, 4 g penjerap di dalam ruang dan 1-2 mm saiz penjerap memberikan masa yang paling lama pada lengkung bulus (220 s) dan 35 °C adalah suhu penjerapan yang paling sesuai untuk system ini.
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Activated alumina has been synthesized using sodium hydroxide and it is has been used for the fixed-bed adsorption of carbon dioxide from the gas stream (15% CO2 and balance with N2). The synthesized activated alumina have been studied at different conditions such as percentage of the sodium hydroxide (0, 10, 20, 30, 40 and 50%), calcination temperature (200, 300, 400 and 500 °C) and calcination time (2, 3 and 4 h). 30% sodium hydroxide/activated alumina calcined at 500 °C for 4 h achieved the highest adsorption (51.92 mg CO2/g adsorbent). The surface properties, surface morphology and crystalline structure of the activated alumina have been characterized by using BET, SEM, FTIR and XRD, respectively. The fixed-bed adsorption of CO2 was studied under different conditions of adsorption temperature (35, 45 and 55 °C ±1), total feed flow rate (90, 120 and 150 mL/min), percentage of carbon dioxide in the feed (12, 15 and 18%), weight of activated alumina (2, 4 and 6 g) and particle size activated alumina (1-2 and 3-4 mm). Subsequently, the breakthrough curves where established for different adsorption conditions. The adsorption results revealed that 15% concentration of CO2 in the feed, 90 mL/min total feed flow rate, 4 g of adsorbent in the column and 1-2 mm adsorbent particle gave the longest breakthrough time (220 s) and 35 °C adsorption temperature was more favorable for the system.
Fixed-bed adsorption of carbon dioxide on NaOHactivated alumina beads / Nurul Darsani Amat Darbis