Chemical Looping Combustion Characteristics of Fe2O3(104) and CO Under Synergistic Action of ZrO2/TiO2 Carrier†

doi:10.7503/cjcu20170577

Abstract

Abstract:

This work focused on the synergetic effect of the supports TiO₂ and ZrO₂ on the chemical looping combustion(CLC) between Fe₂O₃(104) and CO. Fe₂O₃(104)/TiO₂ and Fe₂O₃(104)/ZrO₂ were prepared, and characterized by means of XRD, SEM and BET. Then, the CLC reactions between the prepared oxygen carrier and CO were studied under 700, 800 and 900 ℃ in a small CLC reaction system, the results suggest that the supports affect the reactivity of Fe₂O₃(104), and ZrO₂ is more efficient than TiO₂. Furthermore, dynamic analysis shows that the reaction between Fe₂O₃(104)/TiO₂ and CO could be assigned to the first order reaction model with the apparent activation energy(E) being 153.6 kJ/mol, while the reaction between Fe₂O₃(104)/ZrO₂ and CO belongs to the Shrink sphere reaction model with E being 118.9 kJ/mol. This work provides more reasonable dynamic model for the designing of CLC reactor.

Key words: Chemical looping combustion, Oxygen carrier, Fe2O3(104), Chemical reaction kinetics

CLC Number:

O641

TrendMD:

CHENG Weiliang, ZHU Mengqian, QIN Wu, HOU Cuicui. Chemical Looping Combustion Characteristics of Fe₂O₃(104) and CO Under Synergistic Action of ZrO₂/TiO₂ Carrier^†[J]. Chem. J. Chinese Universities, 2018, 39(3): 506.

Figures/Tables 11

Fig.1 Schematic progress of chemical-looping combustion

Fig.2 Chemical chain combustion test stand diagram

Fig.3 XRD patterns of the prepared oxygen carrieres Fe2O3(104)/TiO2(A) and Fe2O3(104)/ZrO2(B)The data are denoted as Fe2O3 different crystal face indices.

Fig.4 SEM images of the prepared oxygen carrieres Fe2O3(104)/TiO2(A) and Fe2O3(104)/ZrO2(B)

Table 1 Specific surface and pore size of different oxygen carriers

Oxygen carrier	Surface area/(m²·g^-1)	Pore volume/(mL·g^-1)	Pore diameter/nm
Fe₂O₃(104)/TiO₂	2.918	0.003	12.967
Fe₂O₃(104)/ZrO₂	3.870	0.006	3.400

Fig.5 CO2 generation for the chemical looping combustion between Fe2O3(104)/ZrO2(a) and Fe2O3(104)/TiO2(b) and CO at 700 ℃(A), 800 ℃(B) and 900 ℃(C), respectively

Table 2 CO2 conversion of different oxygen carriers at different time

Temperature/℃	Time/min	Fe₂O₃(104)/TiO₂	Fe₂O₃(104)/ZrO₂
700	6	0.322	0.308
	7	0.309	0.276
	8	0.286	0.245
	16	0.165	0.135
800	6	0.388	0.510
	7	0.348	0.452
	8	0.309	0.410
	16	0.174	0.262
900	6	0.462	0.475
	7	0.409	0.438
	8	0.363	0.401
	16	0.207	0.272

Fig.6 Thermogravimetric curves of Fe2O3(104)/TiO2(a) and Fe2O3(104)/ZrO2(b) and CO at constant temperature(900 ℃), respectirely

Fig.7 Conversion curves of reaction of Fe2O3(104)/TiO2(a) and Fe2O3(104)/ZrO2(b) and CO at 900 ℃, respectrvely

Table 3 Correlation coefficients calculated using different kinetic models

Reaction	Correlation coefficient		Reaction	Correlation coefficient
Reaction	Fe₂O₃(104)/TiO₂		Fe₂O₃(104)/ZrO₂	Fe₂O₃(104)/TiO₂	Fe₂O₃(104)/ZrO₂
Phase interface	0.8474	0.9308	Shrink the sphere	0.9553	0.9953
First order	0.9921	0.9494	Power function law	0.8995	0.9625
Secondary	0.9099	0.1601	Valensi	0.9398	0.9787
Three-stage	0.7816	0.0528	Jander	0.9873	0.9650
Shrink the cylinder	0.9288	0.9875	G-B	0.9607	0.9828

Fig.8 TG curves for chemical looping combustion reaction between CO and oxygen carrier Fe2O3(104)/TiO2(A) and Fe2O3(104)/ZrO2(B), respectively

References 41

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Chemical Looping Combustion Characteristics of Fe₂O₃(104) and CO Under Synergistic Action of ZrO₂/TiO₂ Carrier^†

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