PREPARATION OF NANOSIZE CU-ZNO AL2O3 CATALYST FOR METHANOL SYNTHESIS BY PHASE-TRANSFER WITH METAL SURFACTANT .1. A STUDY OF PREPARATION CONDITIONS/

A phase transfer technique was employed to prepare nanosize Cu-ZnO/Al2 O3 catalyst particles. Due to adsorption of metal surfactants, sol par ticles are transferred from the aqueous phase to the organic phase. Co nsequently, the agglomeration of particles can be reduced. Cu-ZnO/Al2O 3 catalyst of about 5-mm particle size was prepared by this technique. It was found that organic solvents with aliphatic chains were more ef fective than aromatic solvents. A solvent-to-salt ratio of about 2200 mi solvent per mole of salt appeared to be ideal. The preparation proc edure comprises preparation of aqueous sol and metal surfactant soluti on in organic solvent, mixing, stirring, and so on. The mol fraction o f metal surfactant versus total metal was approximately 0.3. The conce ntration of salt and precipitant was 0.2-0.4 mol/L. (C) 1996 Academic Press, Inc.