Calorimetric study of room temperature adsorption of N2O and CO on Cu(II)-exchanged ZSM5 zeolites

被引：16

作者：

Rakic, V

Dondur, V

Gajivon, S

Auroux, A

机构：

[1] Fac Agr, YU-11080 Belgrade, Serbia

[2] Univ Belgrade, Fac Phys Chem, Belgrade, Serbia

[3] Inst Gen & Phys Chem, YU-11000 Belgrade, Serbia

[4] Inst Rech Catalyse, F-69626 Villeurbanne, France

来源：

THERMOCHIMICA ACTA | 2004年 / 420卷 / 1-2期

关键词：

calorimetry; ZSDR5; N2O; CO; FTIR of N2O;

D O I：

10.1016/j.tca.2003.12.030

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Copper ion-exchanged ZSM5 zeolites have been prepared with different cooper loadings from under- to over-exchanged levels. The adsorptions of N2O and CO at 303 K have been studied using calorimetric method and infrared spectroscopy. The samples were additionally characterised by ammonia adsorption at 423 K. The active sites for both N2O and CO are Cu(I) ions, which were formed as a result of pre-treatment in vacuum at 673 K. Room temperature adsorption of nitrous oxide at low equilibrium pressures (up to 66.7 Pa) resulted in small amounts of chemisorbed N2O (<0.2 molecule per one Cu ion). Differential heats of N2O adsorption between 80 and 30kJ/mol were obtained. Differential heats of CO adsorption between 140 and 40 kJ/mol were obtained. The obtained amounts of chemisorbed species in the investigated systems and the values of differential heats of both nitrous oxide and carbon monoxide demonstrate the dependence on the copper content. (C) 2004 Elsevier B.V. All rights reserved.

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页码：51 / 57

页数：7

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