Astm D 3663 – 03 pdf free download

Standard Test Method for
Surface Area of Catalysts and Catalyst Carriers1

This standard is issued under the fixed designation D 3663; 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. Scope

1.1 This test method covers the determination of surface
areas of catalyst and catalyst carriers that have Type II or IV
nitrogen adsorption isotherms, and at least 1 m2
/g of area. A
A volumetric measuring system is used to obtain at least four data
points which fit on the linear BET2 line.

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: 3
D 3766 Terminology Relating to Catalysts and Catalysis
E 177 Practice for Use of the Terms Precisions and Bias in
ASTM Test Methods
E 456 Terminology Relating to Quality and Statistics
E 691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method.

3. Terminology

3.1 Consult Terminology D 3766 for definitions of other
terms used.

3.2 Definition:

3.2.1 surface area of a catalyst—the total surface of the
catalyst. It is expressed in square metres per gram.

3.3 Symbols:
PH1 = initial helium pressure, tor

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