1.1 This guide measures pore volume of powdered catalysts and catalyst carriers by titration with water which does not react with material. The range of pore volume is 0.25mL/g to 0.46mL/g. 1.2 This guide is suitable for fine catalysts such as fluid catalytic cracking (FCC) catalyst (fresh or equilibrium), catalyst additives and spray dried catalyst carriers and/or finished catalysts and is typically applicable to powders with the majority of particles (above 90%) in the distribution range between 20 and 150m equivalent spherical diameter as determined by D4464 and with an average particle size between 60 and 100m. NOTE 1- This technique is capable of measuring particles below and above this range (e.g. from 1 to 300m) but no precision data is available. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
KeywordsFCC; fluid catalytic cracking catalyst; pore volume; water adsorption, catalytic material
. It will be a new guide for powdered catalysts and catalyst carriers such as FCC catalysts and other catalysts that are manufactured by spray drying processes. Pore volume is an essential catalyst property and is usually measured by mercury porosimetry. However, the use of mercury being such a toxic chemical is highly regulated and other techniques are in demand. The water pore volume is correlatable to mercury porosimetry for FCC catalysts. Other catalysts may require a different correlation.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Draft Under Development