COLL 176 |
| John W. Geus and A. J. van Dillon. Debye Institute, Dept. of Physical Organic Chemistry, Utrecht University, Utrecht, Netherlands |
| Production of supported catalysts by impregnation and drying is an industrially favored procedure. No waste water results and loss of active material can be readily prevented. The drying step has appeared to be most critical in determining the distribution of the active precursor throughout the support. Measurement of the rate of release of water indicates that volatilization of water predominantly proceeds at the external edge of the support bodies. Consequently migration of the active precursor to the edge is difficult to prevent. Limitation of the transport of the active precursor through a liquid film covering the surface of the support is an effective means to prevent segregation of the active component to the edge. The effect of the viscosity of the solution of the active precursor during drying and the interaction of the liquid with the surface of the support are dominating the transport to the edge. |
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The Science and Engineering of Catalyst Preparation
2:00 PM-5:25 PM, Monday, March 29, 2004 Marriott -- Orange County 3, Oral
Division of Colloid and Surface Chemistry |