Characterization of Mechanochemically Synthesized CaO·ZnO/K2O Mixed Oxides
Abstract
Room temperature ball milling of CaO and ZnO powder mixture (using molar ratio of CaO:ZnO of 1:2) with the addition of stoichiometrically required amount of water to form calcium zinc hydroxide hydrate (CaZn2(OH)6•2H2O) and subsequent calcination at 700 oC was conducted. In order to improve basicity of mixed oxides, calcium zinc hydroxide hydrate was modified by the addition of promoters. The addition of promoter in initial powder mixture such as K2CO3 and KOH (with molar ratio of promoter to CaO of 1:10) was shown to effect the mechanochemical reaction. The prepared catalysts were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), base strength using Hammett indicator method and scanning electron microscopy (SEM and SEM-EDS). The results showed that, during mechanochemical treatment, CaO, ZnO and H2O reacted rapidly to form CaZn2(OH)6•2H2O, and this was the same when promoters were used. Only difference was in basicity of the catalysts, and opposite of the exp...ected, results showed that the addition of promoters did not cause an increase of basicity. On the other hand, addition of KOH to initial powder mixture caused increase of carbonates formation during mechanochemical treatment.
Keywords:
ball milling / CaO / ZnO / K2O / mechanochemistrySource:
The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts, 2012, 28-28Publisher:
- Belgrade : Serbian Ceramic Society
Funding / projects:
Institution/Community
Институт техничких наука САНУ / Institute of Technical Sciences of SASATY - CONF AU - Kesić, Željka AU - Lukić, Ivana AU - Zdujić, Miodrag AU - Jovanović, Dušan AU - Liu, Hui AU - Skala, Dejan PY - 2012 UR - https://dais.sanu.ac.rs/123456789/505 AB - Room temperature ball milling of CaO and ZnO powder mixture (using molar ratio of CaO:ZnO of 1:2) with the addition of stoichiometrically required amount of water to form calcium zinc hydroxide hydrate (CaZn2(OH)6•2H2O) and subsequent calcination at 700 oC was conducted. In order to improve basicity of mixed oxides, calcium zinc hydroxide hydrate was modified by the addition of promoters. The addition of promoter in initial powder mixture such as K2CO3 and KOH (with molar ratio of promoter to CaO of 1:10) was shown to effect the mechanochemical reaction. The prepared catalysts were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), base strength using Hammett indicator method and scanning electron microscopy (SEM and SEM-EDS). The results showed that, during mechanochemical treatment, CaO, ZnO and H2O reacted rapidly to form CaZn2(OH)6•2H2O, and this was the same when promoters were used. Only difference was in basicity of the catalysts, and opposite of the expected, results showed that the addition of promoters did not cause an increase of basicity. On the other hand, addition of KOH to initial powder mixture caused increase of carbonates formation during mechanochemical treatment. PB - Belgrade : Serbian Ceramic Society C3 - The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts T1 - Characterization of Mechanochemically Synthesized CaO·ZnO/K2O Mixed Oxides SP - 28 EP - 28 UR - https://hdl.handle.net/21.15107/rcub_dais_505 ER -
@conference{ author = "Kesić, Željka and Lukić, Ivana and Zdujić, Miodrag and Jovanović, Dušan and Liu, Hui and Skala, Dejan", year = "2012", abstract = "Room temperature ball milling of CaO and ZnO powder mixture (using molar ratio of CaO:ZnO of 1:2) with the addition of stoichiometrically required amount of water to form calcium zinc hydroxide hydrate (CaZn2(OH)6•2H2O) and subsequent calcination at 700 oC was conducted. In order to improve basicity of mixed oxides, calcium zinc hydroxide hydrate was modified by the addition of promoters. The addition of promoter in initial powder mixture such as K2CO3 and KOH (with molar ratio of promoter to CaO of 1:10) was shown to effect the mechanochemical reaction. The prepared catalysts were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), base strength using Hammett indicator method and scanning electron microscopy (SEM and SEM-EDS). The results showed that, during mechanochemical treatment, CaO, ZnO and H2O reacted rapidly to form CaZn2(OH)6•2H2O, and this was the same when promoters were used. Only difference was in basicity of the catalysts, and opposite of the expected, results showed that the addition of promoters did not cause an increase of basicity. On the other hand, addition of KOH to initial powder mixture caused increase of carbonates formation during mechanochemical treatment.", publisher = "Belgrade : Serbian Ceramic Society", journal = "The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts", title = "Characterization of Mechanochemically Synthesized CaO·ZnO/K2O Mixed Oxides", pages = "28-28", url = "https://hdl.handle.net/21.15107/rcub_dais_505" }
Kesić, Ž., Lukić, I., Zdujić, M., Jovanović, D., Liu, H.,& Skala, D.. (2012). Characterization of Mechanochemically Synthesized CaO·ZnO/K2O Mixed Oxides. in The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts Belgrade : Serbian Ceramic Society., 28-28. https://hdl.handle.net/21.15107/rcub_dais_505
Kesić Ž, Lukić I, Zdujić M, Jovanović D, Liu H, Skala D. Characterization of Mechanochemically Synthesized CaO·ZnO/K2O Mixed Oxides. in The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts. 2012;:28-28. https://hdl.handle.net/21.15107/rcub_dais_505 .
Kesić, Željka, Lukić, Ivana, Zdujić, Miodrag, Jovanović, Dušan, Liu, Hui, Skala, Dejan, "Characterization of Mechanochemically Synthesized CaO·ZnO/K2O Mixed Oxides" in The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts (2012):28-28, https://hdl.handle.net/21.15107/rcub_dais_505 .