Abstract
CuO/SiO2 and NiO/SiO2 with bimodal pore structure were prepared by sol-gel reactions of Tetra-methoxysilane (TMOS) and the respective metal nitrate in the presence of poly (ethylene oxide) (PEO) with an average molecular weight of 10 000 and the catalyst of acetic acid. In this process, the interconnected macroporous morphology was formed when transitional structures of spinodal decomposition were frozen by the sol-gel transition of silica. The addition of copper and nickel into the silica-PEO system had a negligible effect on the morphology formation. In gel formation, it was found that NiO crystalline sizes in the samples increased with decreasing Si/Ni molar ratio. It was considered that PEO interacted with both silica and nickel cations. In the CuO/SiO2 with the presence of PEO, CuO crystalline sizes were larger than those of NiO/SiO2. It was considered that there was no obvious interaction between the Cu cation and PEO, most of the copper ions in wet silica gel were present in the outer solution. They easily aggregated as copper salts in the drying process of wet gel and decomposed into CuO particles in heating. While in the CuO/SiO2 with the absence of PEO, the Cu was selectively entrapped as small particles in the gel skeleton due to the interaction between Cu aqua complex and silica gel network.
Similar content being viewed by others
References
Sekizawa K, Yano S, Eguchi K, Arai H (1998) Appl Catal A 169:291
Fridman VZ, Davydov AA (2000) J Catal 195:20
Brands DS, Poels EK, Bliek A (1999) Appl Catal A 184:279
Ermakova MA, Ermakov Yu D (2003) Appl Catal A 245:277
Murthy KV, Patterson PM, Jacobs G, Davis BH, Keane MA (2004) J Catal 223:74
Couttenye RA, Vila MHD, Suib SL (2005) J Catal 233:317
Keane MA (2004) Appl Catal A 271:109
Cauqui MA Rodriguez-Izquierdo JM (1992) J Non-Cryst Solids 147/148:724
Takanishi R, Sato S, Sodesawa T, Kato M, Yoshii T (1999) Chem Lett 305
Nakanishi K, Soga N (1991) J Am Ceram Soc 74:2518
Ishizuka N, Minakuchi H, Nakanishi K, Soga N, Tanaka N (1998) J Chromatogr A 797:133
Minakuchi H, Nakanishi K, Soga N, Ishizuka N, Tanaka N (1996) Anal Chem 68:3498
Nakanishi K, Motowaki S, Soga N (1992) Bull Inst Chem Res 70(2):144
Takahashi R, Nakanishi K, Soga N (1998) J Ceram Soc Jpn 106:772
Takahashi R, Sato S, Sodesawa T, Yabuki M (2001) J Catal 200:197
Nakamura N, Takahashi R, Sato S, Sodesawa T, Yoshida S (2000) Phys Chem Chem Phys 2:4983
Sato S, Takahashi R, Sodesawa T, Koubata M (2005) Appl Catal A 284:247
Kruk M, Jaroniec M (2001) Chem Mater 13:3169
Nakanishi K, Komura H, Takahashi R, Soga N (1994) Bull Chem Soc Jpn 67:1327
Nakanishi K, Yamasaki Y, Kaji H, Soga N, Inoue T, Nemoto N (1994) J Sol-Gel Sci Technol 2:227
Takahashi R, Sato S, Sodesawa T, Suzuki M, Ogura K (2000) Bull Chem Soc Jpn 73:765
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Zheng, M., Zhao, T., Xu, W. et al. Preparation and characterization of CuO/SiO2 and NiO/SiO2 with bimodal pore structure by sol-gel method. J Sol-Gel Sci Technol 39, 151–157 (2006). https://doi.org/10.1007/s10971-006-9172-2
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10971-006-9172-2