Simplified synthesis of K2CO3-promoted hydrotalcite based on hydroxide-form precursors: Effect of Mg/Al/K2CO3 ratio on high-temperature CO2 sorption capacity

• Published in: The Korean journal of chemical engineering Vol. 34; no. 1; pp. 1 - 5
• Main Authors: Jang, Hee Jin, Kim, Suji, Lee, Ki Bong
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.01.2017; Springer Nature B.V; 한국화학공학회
• Subjects: Aluminum; Biotechnology; Carbon dioxide; Catalysis; Chemistry; Chemistry and Materials Science; High temperature; Industrial Chemistry/Chemical Engineering; Magnesium; Materials Science; Precursors; Rapid Communication; Sorbents; Sorption; Thermogravimetric analysis; 화학공학; Sorption; Hydrothermal Synthesis; Hydrotalcite; K; CO; Sorbent; Promotion
• ISSN: 0256-1115; 1975-7220
• DOI: 10.1007/s11814-016-0294-0

Hydrotalcite was synthesized from hydroxide-form precursors to prepare a novel high-temperature CO 2 sorbent, and the effect of Mg/Al ratio on CO 2 sorption was studied. To enhance the CO 2 sorption capacity of the sorbent, K 2 CO 3 was coprecipitated during the synthetic reaction. X-ray diffraction analysis indicated that the prepared samples had a well-defined crystalline hydrotalcite structure, and confirmed that K 2 CO 3 was successfully coprecipitated in the samples. The morphology of the hydrotalcite was confirmed by scanning electron microscopy, and N 2 adsorption analysis was used to estimate its surface area and pore volume. In addition, thermogravimetric analysis was used to measure its CO 2 sorption capacity, and the results revealed that the Mg: Al: K 2 CO 3 ratio used in the preparation has an optimum value for maximum CO 2 sorption capacity.