Page 157 - Principles of Catalyst Development
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CATALYST CHARACTERIZATION 145
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HYDRAULIC PRESSURE
Figure 7.7. Results of bulk crushing strength tests.
through the screen and are collected. Losses of less than one weight percent
are acceptable.
7.3.3.3. Loss on Ignition
Porous particles contain up to 20% moisture adsorbed in pores and
on the surface. Calculations that use the weight of the catalyst should always
correct for this. Exact moisture content is determined by heating a pre-
weighed sample in a crucible at temperatures above 1O()()0C. All volatile
material, adsorbed moisture, and any constitutional water is removed. The
sample is cooled in a dessicator and weighed.
Figure 7.8. Apparatus for measuring loss on attritio··l.
