Preparation of Rh/Al2O3-Cr2O3 Monolithic Catalysts for Dichloromethane Combustion†

doi:10.7503/cjcu20160843

Abstract

Abstract:

A series of Rh catalysts supported on Al₂O₃ powder was prepared by impregnation method. Then a series of Rh/Al₂O₃-Cr₂O₃ monolithic catalysts was prepared by coating method, different proportions of Rh/Al₂O₃, Cr₂O₃ and aluminum gel were mixed into a homogeneous slurry, and then was coated onto the cordierite honeycomb ceramic. These catalysts with different Rh contents were tested for catalytic combustion of dichloromethane. It was found that the 0.4 Rh/Al₂O₃-Cr₂O₃(Rh contents: 0.4 g/L) had the highest activity and no chlorine-containing by-products were formed. The catalysts were characterized by various techniques such as XRD, H₂-TPR, NH₃-TPD and BET. The results showed that the addition of Rh can improve the surface acidity and redox performance of the catalyst, and further improve the activity of the catalyst. It was believed that the activity of the catalyst was closely related to its reducibility and surface acidity. Moreover, the addition of Cr₂O₃ is beneficial to the further oxidation of CH₃Cl intermediate and thus improve the selectivity.

Key words: Monolithic catalyst, Dichloromethane, Catalytic combustion, Surface acidity, Reducibility

CLC Number:

O643

TrendMD:

CHEN Wenya, ZHU Li, HE Jun, XIE Yunlong, LU Jiqing, LUO Mengfei. Preparation of Rh/Al₂O₃-Cr₂O₃ Monolithic Catalysts for Dichloromethane Combustion^†[J]. Chem. J. Chinese Universities, 2017, 38(4): 606.

Figures/Tables 8

Table 1 SBET, H2 consumption and surface acidity data of catalysts

Catalyst	S_BET/(m²·g^-1)	H₂ consumption/(mmol·g^-1)	Surface acidity/(μmol·g^-1)
0.4Rh/Al₂O₃-Cr₂O₃	137	1.93	1150
Al₂O₃-Cr₂O₃	122	1.54	580
0.4Rh/Cr₂O₃	47	1.09	270
Cr₂O₃	31	0.65	280
0.4Rh/Al₂O₃	210	0.39	2180
Al₂O₃	207	0.11	1043

Fig.1 XRD patterns of the various catalystsa. 0.4Rh/Al2O3-Cr2O3; b. Al2O3-Cr2O3; c. 0.4Rh/Cr2O3; d. Cr2O3; e. 0.4Rh/Al2O3; f. Al2O3.

Fig.2 H2-TPR profiles and H2 consumption of various catalystsa. 0.4Rh/Al2O3-Cr2O3; b. Cr2O3; c. Al2O3-Cr2O3; d. 0.4Rh/Cr2O3; e. 0.4Rh/Al2O3; f. Al2O3.

Fig.3 NH3-TPD profiles of various catalystsa. 0.4Rh/Al2O3; b.Al2O3; c. Cr2O3; d. Al2O3-Cr2O3; e. 0.4Rh/Al2O3-Cr2O3; f. 0.4Rh/Cr2O3.

Fig.4 Catalysis performance of CH2Cl2 on various Rh/Al2O3-Cr2O3 catalysts a. 0.4Rh/Al2O3-Cr2O3; b. Al2O3; c. 0.4Rh/Al2O3; d. Al2O3-Cr2O3; e. 0.4Rh/Cr2O3; f. Cr2O3.

Fig.5 Catalytic performance of xRh/Al2O3-Cr2O3 catalysts a. 0.4Rh/Al2O3-Cr2O3; b. 0.3Rh/Al2O3-Cr2O3; c. 0.2Rh/Al2O3-Cr2O3; d. 0.5Rh/Al2O3-Cr2O3; e. Al2O3-Cr2O3.

Fig.6 Catalysts selectivity to CH3Cl in CH2Cl2 destruction on various catalysts

Fig.7 Relationship between H2 consumption, surface acidity and the reaction rate at 340 ℃ of catalysts

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Preparation of Rh/Al₂O₃-Cr₂O₃ Monolithic Catalysts for Dichloromethane Combustion^†

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