Selection of metal oxides in the preparation of rice husk ash (RHA)/CaO sorbent for simultaneous SO2 and NO removal.
In this work, the removal of SO(2) and NO from simulated flue gas from combustion process was investigated in a fixed-bed reactor using rice husk ash (RHA)/CaO-based sorbent. Various metal precursors were used in order to select the best metal impregnated over RHA/CaO sorbents. The results showed that RHA/CaO sorbents impregnated with CeO(2) had the highest sorption capacity among other impregnated metal oxides for the simultaneous removal of SO(2) and NO. Infrared spectroscopic results indicated the formation of both sulfate (SO(4)(2-)) and nitrate (NO(3)(-)) species due to the catalytic role played by CeO(2). Apart from that, the catalytic activity of the RHA/CaO/CeO(2) sorbent was found to be closely related to its physical properties (specific surface area, total pore volume and average pore diameter).
Dahlan
Irvan
I
School of Chemical Engineering, Universiti Sains Malaysia, Engineering Campus, Seri Ampangan, 14300 Nibong Tebal, Pulau Pinang, Malaysia.
Lee
Keat Teong
KT
Kamaruddin
Azlina Harun
AH
Mohamed
Abdul Rahman
AR
D000327:Adsorption; D000393:Air Pollutants / Q000302:isolation & purification; D000397:Air Pollution / Q000517:prevention & control*; D017610:Calcium Compounds / Q000737:chemistry*; D002563:Cerium / Q000737:chemistry*; D002606:Charcoal / Q000138:chemical synthesis / Q000737:chemistry*; D005740:Gases; D008670:Metals / Q000737:chemistry; D009569:Nitric Oxide / Q000302:isolation & purification*; D012275:Oryza; D010087:Oxides / Q000737:chemistry*; D013458:Sulfur Dioxide / Q000302:isolation & purification*
D000393:Air Pollutants; D017610:Calcium Compounds; D005740:Gases; D008670:Metals; D010087:Oxides; D013458:Sulfur Dioxide; D002606:Charcoal; D002563:Cerium; D009569:Nitric Oxide; C030583:ceric oxide; C016538:lime