Standard Test Method for
Determination of Catalyst Acidity by Ammonia
This standard is issued under the fixed designation D 4824; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1.1 This test method covers the determination of the acidity of
catalysts and catalyst carriers by ammonia chemisorption. A
A volumetric measuring system is used to obtain the amount of
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
1.3 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.
2. Referenced Documents
2.1 ASTM Standards: 2
D 3766 Terminology Relating to Catalysts and Catalysis
E 691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
3.1 Definitions—See Terminology D 3766.
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