Synthesis of mesoporous silica from bottom ash and its application for CO2 sorption

• Published in: The Korean journal of chemical engineering Vol. 27; no. 3; pp. 1010 - 1014
• Main Authors: Chen, Chao, You, Kwang-Seok, Ahn, Ji-Whan, Ahn, Wha-Seung
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01-05-2010; 한국화학공학회
• Subjects: Biotechnology; Catalysis; Chemistry; Chemistry and Materials Science; Industrial Chemistry/Chemical Engineering; Materials Science; Rapid Communication; 화학공학; Polyethyleneimine; Mesoporous Silica; Carbon Dioxide Capture; SBA-15; Bottom Ash
• ISSN: 0256-1115; 1975-7220
• DOI: 10.1007/s11814-010-0153-3

A supernatant solution of silicate species extracted from bottom ash in a power plant was used to prepare a mesoporous silica by the synthesis protocol of SBA-15. XRD, N
2
adsorption-desorption, and TEM confirmed a disordered mesopore structure. The pore volume and average pore size of the product were significantly larger than SBA-15 prepared using pure chemicals, and complementary textural mesoporosity was detected. When the mesoporous silica was tested for carbon dioxide sorption after polyethyleneimine (PEI) impregnation, substantially higher CO
2
sorption capacity (169 mg CO
2
/g-sorbent) was achieved than that of PEI-impregnated pure SBA-15 under the same test conditions. High CO
2
sorption capacity was maintained when the gas composition was changed to 15% CO
2
, and the hybrid material exhibited satisfactory performances during the 10 recycle runs.