Surface Composition of Silver Nanocubes and Their Influence on Morphological Stabilization and Catalytic Performance in Ethylene Epoxidation

Shiv Shankar Sangaru; Haibo Zhu; Devon C. Rosenfeld; Akshaya Kumar Samal; Dalaver Anjum; Jean Marie Basset

doi:10.1021/acsami.5b09927

Surface Composition of Silver Nanocubes and Their Influence on Morphological Stabilization and Catalytic Performance in Ethylene Epoxidation

Shiv Shankar Sangaru, Haibo Zhu, Devon C. Rosenfeld, Akshaya Kumar Samal, Dalaver Anjum, Jean Marie Basset

Physics

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

24 Scopus citations

Abstract

Silver nanocubes with exposed (100) facets are reported to have improved selectivity with respect to their spherical counterparts for ethylene epoxidation. In the present study, we observe that the surface composition of the silver nanocubes also has a critical impact on activity. Detailed investigation of the surface composition of silver nanocubes has been carried out using HRTEM, SEM, EDS, EELS, and EFTEM. Surfaces of silver nanocubes are "passivated" by chloride, and its removal is essential to achieve any catalytic activity. However, the surface chloride is apparently essential for stabilizing the cubic morphology of the particles. Attempts were made to understand the competing effects of the surface species for retaining the morphology of the nanocubes and on their catalytic activity in ethylene epoxidation.

Original language	British English
Pages (from-to)	28568-28576
Number of pages	9
Journal	ACS Applied Materials and Interfaces
Volume	7
Issue number	51
DOIs	https://doi.org/10.1021/acsami.5b09927
State	Published - 30 Dec 2015

Keywords

catalysis
ethylene epoxidation
polyol method
silver nanocubes

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10.1021/acsami.5b09927

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abstract = "Silver nanocubes with exposed (100) facets are reported to have improved selectivity with respect to their spherical counterparts for ethylene epoxidation. In the present study, we observe that the surface composition of the silver nanocubes also has a critical impact on activity. Detailed investigation of the surface composition of silver nanocubes has been carried out using HRTEM, SEM, EDS, EELS, and EFTEM. Surfaces of silver nanocubes are {"}passivated{"} by chloride, and its removal is essential to achieve any catalytic activity. However, the surface chloride is apparently essential for stabilizing the cubic morphology of the particles. Attempts were made to understand the competing effects of the surface species for retaining the morphology of the nanocubes and on their catalytic activity in ethylene epoxidation.",

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T1 - Surface Composition of Silver Nanocubes and Their Influence on Morphological Stabilization and Catalytic Performance in Ethylene Epoxidation

AU - Sangaru, Shiv Shankar

AU - Zhu, Haibo

AU - Rosenfeld, Devon C.

AU - Samal, Akshaya Kumar

AU - Anjum, Dalaver

AU - Basset, Jean Marie

PY - 2015/12/30

Y1 - 2015/12/30

N2 - Silver nanocubes with exposed (100) facets are reported to have improved selectivity with respect to their spherical counterparts for ethylene epoxidation. In the present study, we observe that the surface composition of the silver nanocubes also has a critical impact on activity. Detailed investigation of the surface composition of silver nanocubes has been carried out using HRTEM, SEM, EDS, EELS, and EFTEM. Surfaces of silver nanocubes are "passivated" by chloride, and its removal is essential to achieve any catalytic activity. However, the surface chloride is apparently essential for stabilizing the cubic morphology of the particles. Attempts were made to understand the competing effects of the surface species for retaining the morphology of the nanocubes and on their catalytic activity in ethylene epoxidation.

AB - Silver nanocubes with exposed (100) facets are reported to have improved selectivity with respect to their spherical counterparts for ethylene epoxidation. In the present study, we observe that the surface composition of the silver nanocubes also has a critical impact on activity. Detailed investigation of the surface composition of silver nanocubes has been carried out using HRTEM, SEM, EDS, EELS, and EFTEM. Surfaces of silver nanocubes are "passivated" by chloride, and its removal is essential to achieve any catalytic activity. However, the surface chloride is apparently essential for stabilizing the cubic morphology of the particles. Attempts were made to understand the competing effects of the surface species for retaining the morphology of the nanocubes and on their catalytic activity in ethylene epoxidation.

KW - catalysis

KW - ethylene epoxidation

KW - polyol method

KW - silver nanocubes

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Surface Composition of Silver Nanocubes and Their Influence on Morphological Stabilization and Catalytic Performance in Ethylene Epoxidation

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