### Abstract

Some consequences of using the rate equation d α/dt=k_{t}f(α) are shown on a simple example. It is demonstrated that k_{t} usually depends on the sample size, and that it is usually incorrect to assume that if mass and heat transport effects are avoided both α and d α/d t - as functions of time - are independent of the initial mass. Rate equations should be based on real local quantities.

Original language | English |
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Pages (from-to) | 235-237 |

Number of pages | 3 |

Journal | Journal of Thermal Analysis |

Volume | 23 |

Issue number | 1-2 |

DOIs | |

Publication status | Published - Feb 1982 |

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### ASJC Scopus subject areas

- Chemical Engineering(all)

### Cite this

**Can a rate constant independent of sample size be obtained from the rate equation generally used in thermal analysis?** / Pokol, G.

Research output: Contribution to journal › Article

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TY - JOUR

T1 - Can a rate constant independent of sample size be obtained from the rate equation generally used in thermal analysis?

AU - Pokol, G.

PY - 1982/2

Y1 - 1982/2

N2 - Some consequences of using the rate equation d α/dt=ktf(α) are shown on a simple example. It is demonstrated that kt usually depends on the sample size, and that it is usually incorrect to assume that if mass and heat transport effects are avoided both α and d α/d t - as functions of time - are independent of the initial mass. Rate equations should be based on real local quantities.

AB - Some consequences of using the rate equation d α/dt=ktf(α) are shown on a simple example. It is demonstrated that kt usually depends on the sample size, and that it is usually incorrect to assume that if mass and heat transport effects are avoided both α and d α/d t - as functions of time - are independent of the initial mass. Rate equations should be based on real local quantities.

UR - http://www.scopus.com/inward/record.url?scp=34250224050&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34250224050&partnerID=8YFLogxK

U2 - 10.1007/BF01908506

DO - 10.1007/BF01908506

M3 - Article

VL - 23

SP - 235

EP - 237

JO - Journal of Thermal Analysis and Calorimetry

JF - Journal of Thermal Analysis and Calorimetry

SN - 1388-6150

IS - 1-2

ER -