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ASTM E3007-15

(Practice)

Standard Practice for Kinetic Values Used to Evaluate the Study of Decomposition Reactions by Thermogravimetry

Standard Practice for Kinetic Values Used to Evaluate the Study of Decomposition Reactions by Thermogravimetry

SIGNIFICANCE AND USE
5.1 The kinetic parameters provided in this practice may be used to evaluate the performance of a standard, apparatus, technique or software for the determined mean parameters (such as Test Methods E1641 and E2958). The results obtained by these approaches may be compared to the values provided by this practice.
SCOPE
1.1 It is the purpose of this practice to provide kinetic parameters for reference material(s) to be used for evaluation of thermogravimetry methods, apparatus, and software where decomposition mass loss and associated temperature are measured. This practice addresses nth order reactions.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 There is no International Organization of Standards (ISO) equivalent to 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.

General Information

Status
Historical
Publication Date
31-May-2015
ICS
71.040.40 - Chemical analysis
Technical Committee
E37 - Thermal Measurements
Drafting Committee
E37.02 - Reference Materials
Current Stage
Ref Project

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ASTM E3007-15 - Standard Practice for Kinetic Values Used to Evaluate the Study of Decomposition Reactions by ThermogravimetryASTM E3007-15 - Standard Practice for Kinetic Values Used to Evaluate the Study of Decomposition Reactions by Thermogravimetry
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ASTM E3007-15 - Standard Practice for Kinetic Values Used to Evaluate the Study of Decomposition Reactions by Thermogravimetry
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:E3007 −15
Standard Practice for
Kinetic Values Used to Evaluate the Study of Decomposition
1
Reactions by Thermogravimetry
This standard is issued under the fixed designation E3007; 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 3. Terminology
3.1 Definitions—Specific technical terms used in this prac-
1.1 It is the purpose of this practice to provide kinetic
tice are defined in Terminologies E473 and E1142, including
parameters for reference material(s) to be used for evaluation
Arrhenius equation, derivative, reaction, and thermogravimet-
of thermogravimetry methods, apparatus, and software where
ric analysis.
decomposition mass loss and associated temperature are mea-
3.1.1 decomposition, n—theprocessbywhichasubstanceis
sured. This practice addresses nth order reactions.
broken up into constituent parts, elements or simpler com-
1.2 The values stated in SI units are to be regarded as
pounds.
standard. No other units of measurement are included in this
3.1.2 kinetics, chemical, n—the study of the dependence of
standard.
the chemical reaction rate on temperature and time.
1.3 There is no International Organization of Standards
(ISO) equivalent to this standard.
4. Summary of Practice
1.4 This standard does not purport to address all of the 4.1 Kinetics is the measurement and study of the rate of a
safety concerns, if any, associated with its use. It is the chemical reaction to the independent parameters of time and
responsibility of the user of this standard to establish appro- temperature. This relationship is often described using the
priate safety and health practices and determine the applica- Arrhenius expression, where:
bility of regulatory limitations prior to use.
dα⁄dt 5Af α exp 2E/RT (1)
~ ! @ #
and:
2. Referenced Documents
α = fraction reacted (dimensionless),
2
2.1 ASTM Standards:
f(α) = some function of α,
-1
E473 Terminology Relating to Thermal Analysis and Rhe-
E = activation energy (J mol ),
-1 -1
ology
R = gas constant (= 8.314 J mol K ),
E1142 Terminology Relating to Thermophysical Properties
T = absolute temperature (K),
E1641 Test Method for Decomposition Kinetics by Thermo-
t = time (s),
gravimetry Using the Ozawa/Flynn/Wall Method exp = natural logarithm base,
-1
E2958 Test Methods for Kinetic Parameters by Factor Jump/ dα/dt = fraction reaction rate (s ),
-1
A = pre-exponential factor (s ), and
Modulated Thermogravimetry
n = reaction order.
NOTE 1—Test Methods E1641 and E2958 determine the pre-
-1
4.2 The function f~α! is commonly in the form:
exponential factor A in units of min . These results shall be converted to
-1
units of s for comparison to values quoted in this practice using:
n
f α 5 1 2 α (2)
~ ! ~ !
21 21 21
ln A, s 5 ln A, min 1ln 60 s ⁄ min 5 ln A, min 14.094
@ # @ # @ # @ #
and is known as an nth order reaction model.
4.3 Eq 1 may be evaluated in either its exponential or
logarithmic form:
1
This practice is under the jurisdiction of ASTM Committee E37 on Thermal
Measurements and is the direct responsibility of Subcommittee E37.02 on Standard
ln@dα/dt# 5 ln@A#1ln@f(α)# 2 E⁄RT (3)
Reference Materials.
4.4 The study of kinetics involves the determination of
Current edition approved June 1, 2015. Published July 2015. DOI: 10.1520/
E3007-15. values of E, A, and n for a given chemical reaction.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
NOTE 2—Activation energy and pre-exponential factor are not indepen-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
dent parameters.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. NOTE 3—The descriptions provided in Eq 1-3 are only mathematical
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E3007−15
models. That is, they represent the fitting of mathematical equations to
material as is practical for the measurement. Handling of these
often “noisy” experimental data. In practice, no such model will faithfully
materials shall be performed by trained workers who are
describe the complete reaction(s) under all conditions for the materials
knowledgeable with their Safety Data Sheets (SDS) and adopt
described in this practice.
appropriate safety precautions according to local regulations.
4.5 Values for the kinetic parameters are typically in the
7. Procedure
ranges of:
7.1 Experimentally determined mean kinetic parameters for
20,E,350 kJ/mol,
21 a reference material are compared to the
...

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