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Title: Preparation and characterization of several high-area NiAl{sub 2}O{sub 4} spinels. Study of their reducibility

Abstract

A rigorous study was made of the different experimental conditions that affect the obtention of high-area spinels. Some of the key factors in the preparation of NiAl{sub 2}O{sub 4}, such as precipitation and calcination temperatures, have been carefully studied and correlated to the reducibility of the final spinel. All the samples were characterized by x-ray diffraction, nitrogen physisorption, scanning electron microscopy, temperature-programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS) techniques. Spinels were obtained with high area (110--220 m{sup 2}/g) compared with those usually reported. XPS showed that these spinels can be surface reduced. The largest amount of metallic nickel phase was found in the spinel prepared by precipitation at 348 K and calcination at 773 K. This spinel also had the lowest initial temperature of reduction (TPR).

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. Rovira i Virgili, Tarragona (ES)
OSTI Identifier:
20050892
Resource Type:
Journal Article
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 12; Journal Issue: 2; Other Information: PBD: Feb 2000; Journal ID: ISSN 0897-4756
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NICKEL OXIDES; ALUMINIUM OXIDES; SPINELS; REDUCTION; TEMPERATURE DEPENDENCE; CHEMICAL PREPARATION; CATALYST SUPPORTS

Citation Formats

Cesteros, Y, Salagre, P, Medina, F, and Sueiras, J E. Preparation and characterization of several high-area NiAl{sub 2}O{sub 4} spinels. Study of their reducibility. United States: N. p., 2000. Web. doi:10.1021/cm990154h.
Cesteros, Y, Salagre, P, Medina, F, & Sueiras, J E. Preparation and characterization of several high-area NiAl{sub 2}O{sub 4} spinels. Study of their reducibility. United States. https://doi.org/10.1021/cm990154h
Cesteros, Y, Salagre, P, Medina, F, and Sueiras, J E. Tue . "Preparation and characterization of several high-area NiAl{sub 2}O{sub 4} spinels. Study of their reducibility". United States. https://doi.org/10.1021/cm990154h.
@article{osti_20050892,
title = {Preparation and characterization of several high-area NiAl{sub 2}O{sub 4} spinels. Study of their reducibility},
author = {Cesteros, Y and Salagre, P and Medina, F and Sueiras, J E},
abstractNote = {A rigorous study was made of the different experimental conditions that affect the obtention of high-area spinels. Some of the key factors in the preparation of NiAl{sub 2}O{sub 4}, such as precipitation and calcination temperatures, have been carefully studied and correlated to the reducibility of the final spinel. All the samples were characterized by x-ray diffraction, nitrogen physisorption, scanning electron microscopy, temperature-programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS) techniques. Spinels were obtained with high area (110--220 m{sup 2}/g) compared with those usually reported. XPS showed that these spinels can be surface reduced. The largest amount of metallic nickel phase was found in the spinel prepared by precipitation at 348 K and calcination at 773 K. This spinel also had the lowest initial temperature of reduction (TPR).},
doi = {10.1021/cm990154h},
url = {https://www.osti.gov/biblio/20050892}, journal = {Chemistry of Materials},
issn = {0897-4756},
number = 2,
volume = 12,
place = {United States},
year = {2000},
month = {2}
}