University of Oulu

Rajendiran, R., Seelam, P. K., Patchaiyappan, A., Balla, P., Shankar, H., Ravi, B., Perupogu, V., & Lassi, U. (2023). Morphologically tailored facet dependent silver nanoparticles supported α-Al2O3 catalysts for chemoselective reduction of aromatic nitro compounds. Chemical Engineering Journal, 451, 138507.

Morphologically tailored facet dependent silver nanoparticles supported α-Al₂O₃ catalysts for chemoselective reduction of aromatic nitro compounds

Saved in:
Author: Rajendiran, Rajesh1; Seelam, Prem Kumar2; Patchaiyappan, Arunkumar3;
Organizations: 1Energy & Environmental Engineering Department, CSIR-Indian Institute of Chemical Technology (IICT), Hyderabad 500007, India
2Sustainable Chemistry Research Unit, Faculty of Technology, P.O. Box 4300, University of Oulu, Oulu 90014, Finland
3Department of Ecology and Environmental Sciences, Pondicherry University, Puducherry 605014, India
4Department of Physics, KPR Institute of Engineering and Technology, Coimbatore 641407, Tamil Nadu, India
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 5 MB)
Persistent link:
Language: English
Published: Elsevier, 2023
Publish Date: 2022-08-31


The nanoparticles surface area, intrinsic sites, exposed microcrystal shapes and lattice planes are some of the key factors in nanocatalysis. The influence of nanoparticles shape dependent had been profound effect on its catalytic activity. This study is focused on the synthesis of morphologically shape-controlled silver (Ag) nanoparticles supported on α-Al₂O₃ catalysts were performed. The correlation of Ag NPs with varied facets and lattice planes on the catalytic activities in chemoselective reduction of nitro compounds was investigated. Engineering the silver nanoparticles with different shapes and facets i.e., nanocubes (AgNCs), nanowires (AgNWs) and nano spheres (AgNSPs) were synthesized by using modified polyol method. It is demonstrated that there is a significant difference in their activities with respect to the shape and nanocrystal facets. The evolution of nanoshapes and the structural properties of Ag nanoparticles were analysed by SEM, TEM, HR-TEM and P-XRD techniques. From XRD, Ag nanocubes exhibited high percentage of low index (1 0 0) facets which are favourable active centers than (1 1 1) plane in nitro reduction. We observed that the silver nanocubes selectively exposed (1 0 0) facets, which are highly favorable for the enhanced catalytic activity in nitro reduction. The reaction rate of nitro phenol to amino phenol over different Ag nanoshapes are 35.01×10−3min−1(AgNCs/Al₂O₃), 8.28×10−3min−1(AgNWs/Al₂O₃), 0.65×10−3 min−1(AgNSPs/Al₂O₃), respectively. The calculated thermodynamic parameters of the Ea values 23.6, 28.6 and 29.4 for the AgNC, AgNWs and AgNSP respectively.

see all

Series: Chemical engineering journal
ISSN: 1385-8947
ISSN-E: 1873-3212
ISSN-L: 1385-8947
Volume: 451
Pages: 1 - 13
DOI: 10.1016/j.cej.2022.138507
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
Funding: Dr. P. Vijayanand gratefully acknowledges the Indian institute of chemical technology (CSIR-IICT), Hyderabad, Govt. Of India. Dr. Prem Seelam wants to acknowledge the HyCat2 project from Hycamite Oy, Finland.
Copyright information: © 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (