Thermal reduction of Cu2+ in presence of Ag+ in clinoptilolite: Structural study by EXAFS and HR-XRD

B. Concepción-Rosabal; I. Rodríguez-Iznaga; V. Petranovskii; F. Chávez Rivas; S. J.A. Figueroa; A. Pentón-Madrigal

Thermal reduction of Cu²⁺ in presence of Ag⁺ in clinoptilolite: Structural study by EXAFS and HR-XRD

Translated title of the contribution: Thermal reduction of Cu²⁺ in presence of Ag⁺ in clinoptilolite: Structural study by EXAFS and HR-XRD

B. Concepción-Rosabal, I. Rodríguez-Iznaga, V. Petranovskii, F. Chávez Rivas, S. J.A. Figueroa, A. Pentón-Madrigal

Escuela Superior de Física y Matemáticas (ESFM)

Research output: Contribution to journal › Article › peer-review

Abstract

Cu²⁺−Ag⁺ bimetallic systems were exchanged and then thermally reduced in natural clinoptilolite (CLI) from Tasajeras deposit (Cuba). The systems were characterized by means of extended X-ray absorption fine structure (EXAFS) and high resolution X-ray diffraction (HR-XRD) experiments. The EXAFS signals of the bimetallic systems showed changes in the Cu²⁺ coordination as a result of their reduction at 150^◦C, which doesn't happen to CuCLI monometallic one. The presence of silver facilitates the reduction of Cu²⁺ in bimetallic systems forming only clusters. At higher reduction temperature (450^◦C) all mono- and bi-metallic samples exhibit mainly metallic particles of Cu and Ag with higher aggregation. These results are confirmed by HR-XRD studies. Aggregation of reduced copper species is restricted in the presence of silver.

Translated title of the contribution	Thermal reduction of Cu²⁺ in presence of Ag⁺ in clinoptilolite: Structural study by EXAFS and HR-XRD
Original language	English
Pages (from-to)	119-124
Number of pages	6
Journal	Revista Cubana de Fisica
Volume	36
Issue number	2
State	Published - 1 Dec 2019

Cite this

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title = "Thermal reduction of Cu2+ in presence of Ag+ in clinoptilolite: Structural study by EXAFS and HR-XRD",

abstract = "Cu2+−Ag+ bimetallic systems were exchanged and then thermally reduced in natural clinoptilolite (CLI) from Tasajeras deposit (Cuba). The systems were characterized by means of extended X-ray absorption fine structure (EXAFS) and high resolution X-ray diffraction (HR-XRD) experiments. The EXAFS signals of the bimetallic systems showed changes in the Cu2+ coordination as a result of their reduction at 150◦C, which doesn't happen to CuCLI monometallic one. The presence of silver facilitates the reduction of Cu2+ in bimetallic systems forming only clusters. At higher reduction temperature (450◦C) all mono- and bi-metallic samples exhibit mainly metallic particles of Cu and Ag with higher aggregation. These results are confirmed by HR-XRD studies. Aggregation of reduced copper species is restricted in the presence of silver.",

author = "B. Concepci{\'o}n-Rosabal and I. Rodr{\'i}guez-Iznaga and V. Petranovskii and {Ch{\'a}vez Rivas}, F. and Figueroa, {S. J.A.} and A. Pent{\'o}n-Madrigal",

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TY - JOUR

T1 - Thermal reduction of Cu2+ in presence of Ag+ in clinoptilolite

T2 - Structural study by EXAFS and HR-XRD

AU - Concepción-Rosabal, B.

AU - Rodríguez-Iznaga, I.

AU - Petranovskii, V.

AU - Chávez Rivas, F.

AU - Figueroa, S. J.A.

AU - Pentón-Madrigal, A.

PY - 2019/12/1

Y1 - 2019/12/1

N2 - Cu2+−Ag+ bimetallic systems were exchanged and then thermally reduced in natural clinoptilolite (CLI) from Tasajeras deposit (Cuba). The systems were characterized by means of extended X-ray absorption fine structure (EXAFS) and high resolution X-ray diffraction (HR-XRD) experiments. The EXAFS signals of the bimetallic systems showed changes in the Cu2+ coordination as a result of their reduction at 150◦C, which doesn't happen to CuCLI monometallic one. The presence of silver facilitates the reduction of Cu2+ in bimetallic systems forming only clusters. At higher reduction temperature (450◦C) all mono- and bi-metallic samples exhibit mainly metallic particles of Cu and Ag with higher aggregation. These results are confirmed by HR-XRD studies. Aggregation of reduced copper species is restricted in the presence of silver.

AB - Cu2+−Ag+ bimetallic systems were exchanged and then thermally reduced in natural clinoptilolite (CLI) from Tasajeras deposit (Cuba). The systems were characterized by means of extended X-ray absorption fine structure (EXAFS) and high resolution X-ray diffraction (HR-XRD) experiments. The EXAFS signals of the bimetallic systems showed changes in the Cu2+ coordination as a result of their reduction at 150◦C, which doesn't happen to CuCLI monometallic one. The presence of silver facilitates the reduction of Cu2+ in bimetallic systems forming only clusters. At higher reduction temperature (450◦C) all mono- and bi-metallic samples exhibit mainly metallic particles of Cu and Ag with higher aggregation. These results are confirmed by HR-XRD studies. Aggregation of reduced copper species is restricted in the presence of silver.

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M3 - Artículo

SN - 0253-9268

VL - 36

SP - 119

EP - 124

JO - Revista Cubana de Fisica

JF - Revista Cubana de Fisica

IS - 2

ER -

Thermal reduction of Cu²⁺ in presence of Ag⁺ in clinoptilolite: Structural study by EXAFS and HR-XRD

Abstract

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