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Hierarchically Structured Porous Spinels via an Epoxide-Mediated Sol–Gel Process Accompanied by Polymerization-Induced Phase Separation

[Image: see text] Enhancing the activity and stability of catalysts is a major challenge in scientific research nowadays. Previous studies showed that the generation of an additional pore system can influence the catalytic performance of porous catalysts regarding activity, selectivity, and stabilit...

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Autores principales: Herwig, Jan, Titus, Juliane, Kullmann, Jens, Wilde, Nicole, Hahn, Thomas, Gläser, Roger, Enke, Dirk
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2018
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6641268/
https://www.ncbi.nlm.nih.gov/pubmed/31457962
http://dx.doi.org/10.1021/acsomega.7b01621
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author Herwig, Jan
Titus, Juliane
Kullmann, Jens
Wilde, Nicole
Hahn, Thomas
Gläser, Roger
Enke, Dirk
author_facet Herwig, Jan
Titus, Juliane
Kullmann, Jens
Wilde, Nicole
Hahn, Thomas
Gläser, Roger
Enke, Dirk
author_sort Herwig, Jan
collection PubMed
description [Image: see text] Enhancing the activity and stability of catalysts is a major challenge in scientific research nowadays. Previous studies showed that the generation of an additional pore system can influence the catalytic performance of porous catalysts regarding activity, selectivity, and stability. This study focuses on the epoxide-mediated sol–gel synthesis of mixed metal oxides, NiAl(2)O(4) and CoAl(2)O(4), with a spinel phase structure, a hierarchical pore structure, and Ni and Co contents of 3 to 33 mol % with respect to the total metal content. The sol–gel process is accompanied by a polymerization-induced phase separation to introduce an additional pore system. The obtained mixed metal oxides were characterized with regard to pore morphology, surface area, and formation of the spinel phase. The Brunauer–Emmett–Teller surface area ranges from 74 to 138 m(2)·g(–1) and 25 to 94 m(2)·g(–1) for Ni and Co, respectively. Diameters of the phase separation-based macropores were between 500 and 2000 nm, and the mesopore diameters were 10 nm for the Ni-based system and between 20 and 25 nm for the cobalt spinels. Furthermore, Ni–Al spinels with 4, 5, and 6 mol % Ni were investigated in the dry reforming of CH(4) (DRM) with CO(2) to produce H(2) and CO. CH(4) conversions near the thermodynamic equilibrium were observed depending on the Ni content and reaction temperature. The Ni catalysts were further compared to a noble metal-containing catalyst based on a spinel system showing comparable CH(4) conversion and carbon selectivity in the DRM.
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spelling pubmed-66412682019-08-27 Hierarchically Structured Porous Spinels via an Epoxide-Mediated Sol–Gel Process Accompanied by Polymerization-Induced Phase Separation Herwig, Jan Titus, Juliane Kullmann, Jens Wilde, Nicole Hahn, Thomas Gläser, Roger Enke, Dirk ACS Omega [Image: see text] Enhancing the activity and stability of catalysts is a major challenge in scientific research nowadays. Previous studies showed that the generation of an additional pore system can influence the catalytic performance of porous catalysts regarding activity, selectivity, and stability. This study focuses on the epoxide-mediated sol–gel synthesis of mixed metal oxides, NiAl(2)O(4) and CoAl(2)O(4), with a spinel phase structure, a hierarchical pore structure, and Ni and Co contents of 3 to 33 mol % with respect to the total metal content. The sol–gel process is accompanied by a polymerization-induced phase separation to introduce an additional pore system. The obtained mixed metal oxides were characterized with regard to pore morphology, surface area, and formation of the spinel phase. The Brunauer–Emmett–Teller surface area ranges from 74 to 138 m(2)·g(–1) and 25 to 94 m(2)·g(–1) for Ni and Co, respectively. Diameters of the phase separation-based macropores were between 500 and 2000 nm, and the mesopore diameters were 10 nm for the Ni-based system and between 20 and 25 nm for the cobalt spinels. Furthermore, Ni–Al spinels with 4, 5, and 6 mol % Ni were investigated in the dry reforming of CH(4) (DRM) with CO(2) to produce H(2) and CO. CH(4) conversions near the thermodynamic equilibrium were observed depending on the Ni content and reaction temperature. The Ni catalysts were further compared to a noble metal-containing catalyst based on a spinel system showing comparable CH(4) conversion and carbon selectivity in the DRM. American Chemical Society 2018-01-30 /pmc/articles/PMC6641268/ /pubmed/31457962 http://dx.doi.org/10.1021/acsomega.7b01621 Text en Copyright © 2018 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
spellingShingle Herwig, Jan
Titus, Juliane
Kullmann, Jens
Wilde, Nicole
Hahn, Thomas
Gläser, Roger
Enke, Dirk
Hierarchically Structured Porous Spinels via an Epoxide-Mediated Sol–Gel Process Accompanied by Polymerization-Induced Phase Separation
title Hierarchically Structured Porous Spinels via an Epoxide-Mediated Sol–Gel Process Accompanied by Polymerization-Induced Phase Separation
title_full Hierarchically Structured Porous Spinels via an Epoxide-Mediated Sol–Gel Process Accompanied by Polymerization-Induced Phase Separation
title_fullStr Hierarchically Structured Porous Spinels via an Epoxide-Mediated Sol–Gel Process Accompanied by Polymerization-Induced Phase Separation
title_full_unstemmed Hierarchically Structured Porous Spinels via an Epoxide-Mediated Sol–Gel Process Accompanied by Polymerization-Induced Phase Separation
title_short Hierarchically Structured Porous Spinels via an Epoxide-Mediated Sol–Gel Process Accompanied by Polymerization-Induced Phase Separation
title_sort hierarchically structured porous spinels via an epoxide-mediated sol–gel process accompanied by polymerization-induced phase separation
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6641268/
https://www.ncbi.nlm.nih.gov/pubmed/31457962
http://dx.doi.org/10.1021/acsomega.7b01621
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