Effect of La(NO3)3 and Pr(NO3)3 on Kinetic of Dehydroxylation of Kaolinite†

doi:10.7503/cjcu20141004

Abstract

Abstract:

The thermal decomposition processes of kaolinite mixed with La(NO₃)₃ and Pr(NO₃)₃ were investigated by thermogravimetric analysis/differential thermal analysis(TG/DTA) simultaneous thermal analysis technique under different heating rates. Thermal analysis data were used for dynamic analysis by the Coats-Redfern integral method and Achar differential method to calculate the kinetic model function, activation energy and pre-exponential factor of dehydroxylation process of kaolinite. The effects of two kinds of rare earth on kinetic parameters of dehydroxylation process of kaolinite were analyzed. The activation energy was validated by Ozawa method. The results show that dehydroxylation of kaolinite and the sample mixed with Pr(NO₃)₃ are controlled by the rate of third-order chemical reaction(F₃), the activation energies are 307.94 and 282.86 kJ/mol, respectively, and the values of pre-exponential factor lnA are 47.8980 and 44.1718, respectively; the kinetic model function of sample mixed with La(NO₃)₃ changes to the second-order chemical reaction(F₂), the activation energy is 196.02 kJ/mol, and the value of pre-exponential factor lnA is 29.5551. Compared with the kaolinite without rare earth, the activation energy and the pre-exponential factor lnA of the sample mixed with Pr(NO₃)₃ have slightly reduced, while those of the sample mixed with La(NO₃)₃ significantly decrease by 36.34% and 38.30%, respectively. The value of the activation energy obtained by Coats-Redfern and Achar method is consistent with the one obtained by Ozawa method.

Key words: La(NO3)3, Pr(NO3)3, Kaolinite, Dehydroxylation process, Activation energy

CLC Number:

O642
TQ170.1

TrendMD:

KUANG Jingzhong, YUAN Weiquan, XU Liyong, LI Lin, HUANG Zhen. Effect of La(NO₃)₃ and Pr(NO₃)₃ on Kinetic of Dehydroxylation of Kaolinite^†[J]. Chem. J. Chinese Universities, 2015, 36(7): 1395.

Figures/Tables 6

References 34

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Heating rate/ (℃·min^-1)	Coats-Redfern method			Achar method
Heating rate/ (℃·min^-1)	Kaolinite	Kaolinite+ La(NO₃)₃	Kaolinite+ Pr(NO₃)₃	Kaolinite	Kaolinite+ La(NO₃)₃	Kaolinite+ Pr(NO₃)₃
10	275.39	190.76	269.03	303.32	215.27	304.52
15	293.78	183.91	254.02	329.33	189.71	281.76
20	277.98	187.42	255.49	324.06	204.34	295.88
25	284.87	187.68	277.09	334.58	208.44	302.43
30	310.90	185.57	271.24	345.18	207.08	317.18
Average	288.58	187.07	265.37	327.29	204.97	300.35

Heating rate/ (℃·min^-1)	Coats-Redfern method			Achar method
Heating rate/ (℃·min^-1)	Kaolinite	Kaolinite+ La(NO₃)₃	Kaolinite+ Pr(NO₃)₃	Kaolinite	Kaolinite+ La(NO₃)₃	Kaolinite+ Pr(NO₃)₃
10	275.39	190.76	269.03	303.32	215.27	304.52
15	293.78	183.91	254.02	329.33	189.71	281.76
20	277.98	187.42	255.49	324.06	204.34	295.88
25	284.87	187.68	277.09	334.58	208.44	302.43
30	310.90	185.57	271.24	345.18	207.08	317.18
Average	288.58	187.07	265.37	327.29	204.97	300.35

Heating rate/ (℃·min^-1)	Coats-Redfern method			Achar method
Heating rate/ (℃·min^-1)	Kaolinite	Kaolinite+ La(NO₃)₃	Kaolinite+ Pr(NO₃)₃	Kaolinite	Kaolinite+ La(NO₃)₃	Kaolinite+ Pr(NO₃)₃
10	43.4691	28.6730	41.9935	47.8400	32.5472	47.5556
15	45.6960	27.6883	39.6585	51.1239	28.6523	44.0226
20	43.4219	28.1997	40.1881	50.4558	30.8576	46.4083
25	44.3856	28.2342	43.3183	51.9198	31.4627	47.2162
30	47.7643	27.9504	42.2074	52.9029	31.2854	49.1495
Average	44.9474	28.1491	41.4732	50.8485	30.9610	46.8704

Heating rate/ (℃·min^-1)	Coats-Redfern method			Achar method
Heating rate/ (℃·min^-1)	Kaolinite	Kaolinite+ La(NO₃)₃	Kaolinite+ Pr(NO₃)₃	Kaolinite	Kaolinite+ La(NO₃)₃	Kaolinite+ Pr(NO₃)₃
10	43.4691	28.6730	41.9935	47.8400	32.5472	47.5556
15	45.6960	27.6883	39.6585	51.1239	28.6523	44.0226
20	43.4219	28.1997	40.1881	50.4558	30.8576	46.4083
25	44.3856	28.2342	43.3183	51.9198	31.4627	47.2162
30	47.7643	27.9504	42.2074	52.9029	31.2854	49.1495
Average	44.9474	28.1491	41.4732	50.8485	30.9610	46.8704

Sample	Ozawa method		Average value(E_a) of Coats-Redfern and Achar method
Sample	E_a/(kJ·mol^-1)		R²
Kaolinite	301.94	0.9908	307.94
Kaolinite+La(NO₃)₃	212.86	0.9987	196.02
Kaolinite+Pr(NO₃)₃	284.23	0.9966	282.86

Effect of La(NO₃)₃ and Pr(NO₃)₃ on Kinetic of Dehydroxylation of Kaolinite^†

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