Cargando…

Catalytic Behavior of Chromium Oxide Supported on Nanocasting-Prepared Mesoporous Alumina in Dehydrogenation of Propane

Mesoporous alumina with narrow pore size distribution centered in the range of 4.4–5.0 nm and with a specific surface area as high as 270 m(2)·g(−1) was prepared via the nanocasting approach using a CMK-3 carbon replica as a hard template. Based on this support, a series of catalysts containing 1, 5...

Descripción completa

Detalles Bibliográficos
Autores principales: Węgrzyniak, Adam, Jarczewski, Sebastian, Węgrzynowicz, Adam, Michorczyk, Barbara, Kuśtrowski, Piotr, Michorczyk, Piotr
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5618360/
https://www.ncbi.nlm.nih.gov/pubmed/28862670
http://dx.doi.org/10.3390/nano7090249
_version_ 1783267169339965440
author Węgrzyniak, Adam
Jarczewski, Sebastian
Węgrzynowicz, Adam
Michorczyk, Barbara
Kuśtrowski, Piotr
Michorczyk, Piotr
author_facet Węgrzyniak, Adam
Jarczewski, Sebastian
Węgrzynowicz, Adam
Michorczyk, Barbara
Kuśtrowski, Piotr
Michorczyk, Piotr
author_sort Węgrzyniak, Adam
collection PubMed
description Mesoporous alumina with narrow pore size distribution centered in the range of 4.4–5.0 nm and with a specific surface area as high as 270 m(2)·g(−1) was prepared via the nanocasting approach using a CMK-3 carbon replica as a hard template. Based on this support, a series of catalysts containing 1, 5, 10, 20 and 30 wt % of chromium was prepared by incipient wetness impregnation, characterized, and studied in the dehydrogenation of propane to propene (PDH). Cr species in three oxidation states—Cr(III), Cr(V) and Cr(VI)—were found on the oxidized surface of the catalysts. The concentration of these species varied with the total Cr loading. Temperature-programmed reduction (H(2)-TPR) and UV-Vis diffuse reflectance spectroscopy (UV-Vis-DRS) studies revealed that Cr(VI) species dominated at the lowest Cr content. An increase in the Cr loading resulted in an appearance of an increasing amount of Cr(III) oxide. UV-Vis-DRS measurements performed in situ during the PDH process showed that at the beginning of the catalytic test Cr(VI) species were reduced to Cr(III) redox species. A crucial role of the redox species in the PDH process over the catalysts with the low Cr content was confirmed. The stability test for the catalyst containing 20 wt % of Cr showed that this sample exhibited the reproducible catalytic performance after the first four regeneration–dehydrogenation cycles. Moreover, this catalyst had higher resistance on deactivation during the PDH process as compared to the reference catalyst with the same Cr loading, but was supported on commercially available alumina.
format Online
Article
Text
id pubmed-5618360
institution National Center for Biotechnology Information
language English
publishDate 2017
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-56183602017-09-29 Catalytic Behavior of Chromium Oxide Supported on Nanocasting-Prepared Mesoporous Alumina in Dehydrogenation of Propane Węgrzyniak, Adam Jarczewski, Sebastian Węgrzynowicz, Adam Michorczyk, Barbara Kuśtrowski, Piotr Michorczyk, Piotr Nanomaterials (Basel) Article Mesoporous alumina with narrow pore size distribution centered in the range of 4.4–5.0 nm and with a specific surface area as high as 270 m(2)·g(−1) was prepared via the nanocasting approach using a CMK-3 carbon replica as a hard template. Based on this support, a series of catalysts containing 1, 5, 10, 20 and 30 wt % of chromium was prepared by incipient wetness impregnation, characterized, and studied in the dehydrogenation of propane to propene (PDH). Cr species in three oxidation states—Cr(III), Cr(V) and Cr(VI)—were found on the oxidized surface of the catalysts. The concentration of these species varied with the total Cr loading. Temperature-programmed reduction (H(2)-TPR) and UV-Vis diffuse reflectance spectroscopy (UV-Vis-DRS) studies revealed that Cr(VI) species dominated at the lowest Cr content. An increase in the Cr loading resulted in an appearance of an increasing amount of Cr(III) oxide. UV-Vis-DRS measurements performed in situ during the PDH process showed that at the beginning of the catalytic test Cr(VI) species were reduced to Cr(III) redox species. A crucial role of the redox species in the PDH process over the catalysts with the low Cr content was confirmed. The stability test for the catalyst containing 20 wt % of Cr showed that this sample exhibited the reproducible catalytic performance after the first four regeneration–dehydrogenation cycles. Moreover, this catalyst had higher resistance on deactivation during the PDH process as compared to the reference catalyst with the same Cr loading, but was supported on commercially available alumina. MDPI 2017-09-01 /pmc/articles/PMC5618360/ /pubmed/28862670 http://dx.doi.org/10.3390/nano7090249 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Węgrzyniak, Adam
Jarczewski, Sebastian
Węgrzynowicz, Adam
Michorczyk, Barbara
Kuśtrowski, Piotr
Michorczyk, Piotr
Catalytic Behavior of Chromium Oxide Supported on Nanocasting-Prepared Mesoporous Alumina in Dehydrogenation of Propane
title Catalytic Behavior of Chromium Oxide Supported on Nanocasting-Prepared Mesoporous Alumina in Dehydrogenation of Propane
title_full Catalytic Behavior of Chromium Oxide Supported on Nanocasting-Prepared Mesoporous Alumina in Dehydrogenation of Propane
title_fullStr Catalytic Behavior of Chromium Oxide Supported on Nanocasting-Prepared Mesoporous Alumina in Dehydrogenation of Propane
title_full_unstemmed Catalytic Behavior of Chromium Oxide Supported on Nanocasting-Prepared Mesoporous Alumina in Dehydrogenation of Propane
title_short Catalytic Behavior of Chromium Oxide Supported on Nanocasting-Prepared Mesoporous Alumina in Dehydrogenation of Propane
title_sort catalytic behavior of chromium oxide supported on nanocasting-prepared mesoporous alumina in dehydrogenation of propane
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5618360/
https://www.ncbi.nlm.nih.gov/pubmed/28862670
http://dx.doi.org/10.3390/nano7090249
work_keys_str_mv AT wegrzyniakadam catalyticbehaviorofchromiumoxidesupportedonnanocastingpreparedmesoporousaluminaindehydrogenationofpropane
AT jarczewskisebastian catalyticbehaviorofchromiumoxidesupportedonnanocastingpreparedmesoporousaluminaindehydrogenationofpropane
AT wegrzynowiczadam catalyticbehaviorofchromiumoxidesupportedonnanocastingpreparedmesoporousaluminaindehydrogenationofpropane
AT michorczykbarbara catalyticbehaviorofchromiumoxidesupportedonnanocastingpreparedmesoporousaluminaindehydrogenationofpropane
AT kustrowskipiotr catalyticbehaviorofchromiumoxidesupportedonnanocastingpreparedmesoporousaluminaindehydrogenationofpropane
AT michorczykpiotr catalyticbehaviorofchromiumoxidesupportedonnanocastingpreparedmesoporousaluminaindehydrogenationofpropane