ASTM D3766-08(2013)
(Terminology)Standard Terminology Relating to Catalysts and Catalysis
Standard Terminology Relating to Catalysts and Catalysis
SCOPE
1.1 This terminology covers definitions of terms related to catalysts and catalysis.Note 1—The Manual of Symbols and Terminology for Physicochemical Quantities and Units presents authoritative descriptions of many terms used in the field of catalysis.2
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Designation: D3766 − 08 (Reapproved 2013)
Standard Terminology Relating to
Catalysts and Catalysis
This standard is issued under the fixed designation D3766; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope density, packing (bulk), n—the ratio of the mass of a
collection of discrete pieces of solid material to the sum of
1.1 This terminology covers definitions of terms related to
the volumes of: the solids in each piece, the voids within the
catalysts and catalysis.
pieces, and the voids among the pieces of the particular
NOTE 1—The Manual of Symbols and Terminology for Physicochemi-
collection.
cal Quantities and Units presents authoritative descriptions of many terms
used in the field of catalysis.
density, particle (envelope), n—the ratio of the mass of a
particle to the sum of the volumes of: the solid in each piece
2. Terminology
and the voids within each piece, that is, within close-fitting
2.1 Definitions: imaginary envelopes completely surrounding each piece.
activity, n—of a catalyst, the measure of the rate of a specific
density, skeletal, n—the ratio of the mass of discrete pieces of
catalytic reaction conducted in the presence of a catalyst.
solid material to the sum of the volumes of: the solid
calcine, v—in catalysis,toheatamaterialtoahightemperature
material in the pieces and closed (or blind) pores within the
causing a physical or chemical change, for example, loss of
pieces.
moisture and volatile matter, or a phase change, or both.
density, theoretical, n—the ratio of the mass of a collection of
catalyst bed support, n—an essentially inert plate, grid,
discrete pieces of solid material to the sum of the volumes of
particulate bed, or other structural component designed to
said pieces, the solid material having an ideal regular
hold up or bear a quantity of catalyst in a catalytic reactor.
arrangement at the atomic level.
catalyst carrier, n—asolid,generallyporousmaterialuponthe
envelope, n—of a particle in catalysis, a theoretical surface
surface or into the voids of which catalytic materials are
that encloses the particle and that bridges openings to the
placed to create the desired catalyst.
interior of the particle.
DISCUSSION—A carrier may have or contribute to catalytic activity.
pore, n—in catalysis, a small opening in a material permitting
catalyst substrate, n—less preferred alternative term for cata-
admission, adsorption, or passage of a fluid.
lyst carrier.
pore size distribution, n— in catalysis, the volume of pores of
catalyst support, n—less preferred alternative term for catalyst
a material expressed or displayed as a function of pore
carrier.
diameters.
crush strength, n—i
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