ASTM D3766-08(2018)
(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
1.2 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D3766 − 08 (Reapproved 2018)
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 crush strength, n—in catalysis, a measure of the resistance of
formed catalysts or catalyst carriers, either singly or in bulk,
1.1 This terminology covers definitions of terms related to
to loss of form when subjected to a compressive force.
catalysts and catalysis.
DISCUSSION—Formed catalysts may include tablets, spheres,
NOTE 1—The Manual of Symbols and Terminology for Physicochemi-
extrudates, rings, pellets, etc. and should be distinguished from
cal Quantities and Units presents authoritative descriptions of many terms
powders and granules.
used in the field of catalysis.
density, packing (bulk), n—the ratio of the mass of a
1.2 This international standard was developed in accor-
collection of discrete pieces of solid material to the sum of
dance with internationally recognized principles on standard-
the volumes of: the solids in each piece, the voids within the
ization established in the Decision on Principles for the
pieces, and the voids among the pieces of the particular
Development of International Standards, Guides and Recom-
collection.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
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
...
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D3766 − 08 (Reapproved 2018)
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 crush strength, n—in catalysis, a measure of the resistance of
formed catalysts or catalyst carriers, either singly or in bulk,
1.1 This terminology covers definitions of terms related to
to loss of form when subjected to a compressive force.
catalysts and catalysis.
DISCUSSION—Formed catalysts may include tablets, spheres,
NOTE 1—The Manual of Symbols and Terminology for Physicochemi- extrudates, rings, pellets, etc. and should be distinguished from
cal Quantities and Units presents authoritative descriptions of many terms
powders and granules.
used in the field of catalysis.
density, packing (bulk), n—the ratio of the mass of a
1.2 This international standard was developed in accor-
collection of discrete pieces of solid material to the sum of
dance with internationally recognized principles on standard-
the volumes of: the solids in each piece, the voids within the
ization established in the Decision on Principles for the
pieces, and the voids among the pieces of the particular
Development of International Standards, Guides and Recom-
collection.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
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
imaginary envelopes completely surrounding each piece.
2.1 Definitions:
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, to heat a material to a high temperature 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—a solid, generally porous material upon the
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 hav
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D3766 − 08 (Reapproved 2013) D3766 − 08 (Reapproved 2018)
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
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.
1.2 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Terminology
2.1 Definitions:
activity, n—of a catalyst, the measure of the rate of a specific catalytic reaction conducted in the presence of a catalyst.
calcine, v—in catalysis, to heat a material to a high temperature causing a physical or chemical change, for example, loss of
moisture and volatile matter, or a phase change, or both.
catalyst bed support, n—an essentially inert plate, grid, particulate bed, or other structural component designed to hold up or bear
a quantity of catalyst in a catalytic reactor.
catalyst carrier, n—a solid, generally porous material upon the surface or into the voids of which catalytic materials are placed
to create the desired catalyst.
DISCUSSION—
A carrier may have or contribute to catalytic activity.
catalyst substrate,n—less preferred alternative term for catalyst carrier.
catalyst support,n—less preferred alternative term for catalyst carrier.
crush strength, n—in catalysis, a measure of the resistance of formed catalysts or catalyst carriers, either singly or in bulk, to loss
of form when subjected to a compressive force.
DISCUSSION—
Formed catalysts may include tablets, spheres, extrudates, rings, pellets, etc. and should be distinguished from powders and granules.
density, packing (bulk), n—the ratio of the mass of a collection of discrete pieces of solid material to the sum of the volumes of:
the solids in each piece, the voids within the pieces, and the voids among the pieces of the particular collection.
density, particle (envelope), n—the ratio of the mass of a particle to the sum of the volumes of: the solid in each piece and the
voids within each piece, that is, within close-fitting imaginary envelopes completely surrounding each piece.
This terminology is under the jurisdiction of ASTM Committee D32 on Catalysts and is the direct responsibility of Subcommittee D32.92 on Nomenclature and
Definitions.
Current edition approved March 1, 2013Nov. 1, 2018. Published March 2013Dece
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