Preparation of Nanosize Cu–ZnO/Al2O3Catalyst for Methanol Synthesis by Phase Transfer with Metal Surfactant: 2. Effect of Additives and Chain Length of Surfactant

✍ Scribed by Zeshan Hu; Songying Chen; Shaoyi Peng

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 178 KB
• Volume: 182
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1996.0488

✦ Synopsis

another instance, organic solvent, in turn, could be emulsi-Nanosize Cu-ZnO/Al 2 O 3 catalysts for methanol synthesis were fied into water, which made washing more difficult and reprepared by the metal surfactant phase transfer technique. The sulted in incomplete phase transfer. A primary study of such effects of chain length of surfactant and additives were studied. factors is described in the accompanying paper (3). The It was found that the longer the organic chain of surfactant, the effect of additives and chain length of surfactant is reported more stable the sol particles and the larger the surface area of in this paper. catalyst. The decomposition temperature of surfactants with longer chains was also higher. For the preparation of Cu-ZnO/ EXPERIMENTAL Al 2 O 3 catalyst, the surfactant organic chain should not be longer than 11 carbon atoms. A synergist could be used to improve surfac-Preparation tant efficiency. A stabilizing agent was used to strengthen the stability of sol particles in water. The time needed for oil-water Aqueous ammonia solution (A. R. grade); copper nitrate, separation was reduced markedly by using a demulsifying agent. zinc nitrate, and aluminum nitrate (A.R.); n-valeric acid, n-The optimal mole ratios of synergist, stabilizing agent, and demuldodecyl acid, n-dodecyl alcohol, and n-hexanol (C.R.); and sifying agent to surfactant were, respectively, 0.6, 0.6, and 1. commercial JFC [C 12 H 23 (OCH 2 CH 2 ) n OH, (n Å 4-6)] were