linear heating
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Minerals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 81
Author(s):  
Kui Li ◽  
Wei Zhang ◽  
Menglong Fu ◽  
Chengzhi Li ◽  
Zhengliang Xue

Generally, the linear correlation coefficient is one of the most significant criteria to appraise the kinetic parameters computed from different reaction models. Actually, the optimal kinetic triplet should meet the following two requirements: first, it can be used to reproduce the original kinetic process; second, it can be applied to predict the other kinetic process. The aim of this paper is to attempt to prove that the common criteria are insufficient for meeting the above two purposes simultaneously. In this paper, the explicit Euler method and Taylor expansion are presented to numerically predict the kinetic process of linear heating reactions. The mean square error is introduced to assess the prediction results. The kinetic processes of hematite reduced to iron at different heating rates (8, 10 and 18 K/min) are utilized for validation and evaluation. The predicted results of the reduction of Fe2O3 → Fe3O4 indicated that the inferior linear correlation coefficient did provide better kinetic predicted curves. In conclusion, to satisfy the above two requirements of reproduction and prediction, the correlation coefficient is an insufficient criterion. In order to overcome this drawback, two kinds of numerical prediction methods are introduced, and the mean square error of the prediction is suggested as a superior criterion for evaluation.


Author(s):  
Yu.I. Tyurin ◽  
N.N. Nikitenkov ◽  
V.S. Sypchenko ◽  
Zhang Hongru ◽  
Ma Syaole

2020 ◽  
Vol 22 (13) ◽  
pp. 6809-6817
Author(s):  
Xueting Wang ◽  
Adam A. Arvidsson ◽  
Magnus Skoglundh ◽  
Anders Hellman ◽  
Per-Anders Carlsson

Study of desorption products from Cu-zeolites (MFI and CHA) during methanol-TPD using a chemical flow reactor with a gas phase FTIR spectrometer.


Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3570
Author(s):  
Pavel Zháňal ◽  
Petr Harcuba ◽  
Josef Stráský ◽  
Jana Šmilauerová ◽  
Přemysl Beran ◽  
...  

A transformation pathway during thermal treatment of metastable β Ti-15Mo alloy was investigated by in situ neutron diffraction. The evolution of individual phases α , β , and ω was investigated during linear heating with two heating rates of 1.9 ∘ C / min and 5 ∘ C / min and during aging at 450 ∘ C . The results showed that with a sufficient heating rate (5 ∘ C / min in this case), the ω phase dissolves before the α phase forms. On the other hand, for the slower heating rate of 1.9 ∘ C / min , a small temperature interval of the coexistence of the α and ω phases was detected. Volume fractions and lattice parameters of all phases were also determined.


Author(s):  
Kristína BARTHA ◽  
Josef STRÁSKÝ ◽  
Jozef VESELÝ ◽  
Veronika POLYAKOVA ◽  
Irina SEMENOVA ◽  
...  

Author(s):  
P. Zháňal ◽  
P. Beran ◽  
T. Hansen ◽  
J. Šmilauerová ◽  
J. Stráský ◽  
...  

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