Support Induced Effects on the Ir Nanoparticles Activity, Selectivity and Stability Performance under CO<sub>2</sub> Reforming of Methane
The production of syngas (H<sub>2</sub> and CO)—a key building block for the manufacture of liquid energy carriers, ammonia and hydrogen—through the dry (CO2−) reforming of methane (DRM) continues to gain attention in heterogeneous catalysis, renewable energy technologies and sustainable...
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oai:doaj.org-article:c38799b5de534f2583ef32e883c1bb262021-11-25T18:30:34ZSupport Induced Effects on the Ir Nanoparticles Activity, Selectivity and Stability Performance under CO<sub>2</sub> Reforming of Methane10.3390/nano111128802079-4991https://doaj.org/article/c38799b5de534f2583ef32e883c1bb262021-10-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/2880https://doaj.org/toc/2079-4991The production of syngas (H<sub>2</sub> and CO)—a key building block for the manufacture of liquid energy carriers, ammonia and hydrogen—through the dry (CO2−) reforming of methane (DRM) continues to gain attention in heterogeneous catalysis, renewable energy technologies and sustainable economy. Here we report on the effects of the metal oxide support (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">γ</mi></semantics></math></inline-formula>-Al<sub>2</sub>O<sub>3</sub>, alumina-ceria-zirconia (ACZ) and ceria-zirconia (CZ)) on the low-temperature (ca. 500–750 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>∘</mo></msup></semantics></math></inline-formula>C) DRM activity, selectivity, resistance against carbon deposition and iridium nanoparticles sintering under oxidative thermal aging. A variety of characterization techniques were implemented to provide insight into the factors that determine iridium intrinsic DRM kinetics and stability, including metal-support interactions and physicochemical properties of materials. All Ir/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">γ</mi></semantics></math></inline-formula>-Al<sub>2</sub>O<sub>3</sub>, Ir/ACZ and Ir/CZ catalysts have stable DRM performance with time-on-stream, although supports with high oxygen storage capacity (ACZ and CZ) promoted CO<sub>2</sub> conversion, yielding CO-enriched syngas. CZ-based supports endow Ir exceptional anti-sintering characteristics. The amount of carbon deposition was small in all catalysts, however decreasing as Ir/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">γ</mi></semantics></math></inline-formula>-Al<sub>2</sub>O<sub>3</sub> > Ir/ACZ > Ir/CZ. The experimental findings are consistent with a bifunctional reaction mechanism involving participation of oxygen vacancies on the support’s surface in CO<sub>2</sub> activation and carbon removal, and overall suggest that CZ-supported Ir nanoparticles are promising catalysts for low-temperature dry reforming of methane (LT-DRM).Ersi NikolarakiGrammatiki GoulaParaskevi PanagiotopoulouMartin J. TaylorKalliopi KousiGeorgios KyriakouDimitris I. KondaridesRichard M. LambertIoannis V. YentekakisMDPI AGarticlegreenhouse gasesdry reforming of methanecarbon dioxidealumina-ceria-zirconia mixed oxidesiridium nanoparticlescoking-resistant catalystsChemistryQD1-999ENNanomaterials, Vol 11, Iss 2880, p 2880 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
greenhouse gases dry reforming of methane carbon dioxide alumina-ceria-zirconia mixed oxides iridium nanoparticles coking-resistant catalysts Chemistry QD1-999 |
| spellingShingle |
greenhouse gases dry reforming of methane carbon dioxide alumina-ceria-zirconia mixed oxides iridium nanoparticles coking-resistant catalysts Chemistry QD1-999 Ersi Nikolaraki Grammatiki Goula Paraskevi Panagiotopoulou Martin J. Taylor Kalliopi Kousi Georgios Kyriakou Dimitris I. Kondarides Richard M. Lambert Ioannis V. Yentekakis Support Induced Effects on the Ir Nanoparticles Activity, Selectivity and Stability Performance under CO<sub>2</sub> Reforming of Methane |
| description |
The production of syngas (H<sub>2</sub> and CO)—a key building block for the manufacture of liquid energy carriers, ammonia and hydrogen—through the dry (CO2−) reforming of methane (DRM) continues to gain attention in heterogeneous catalysis, renewable energy technologies and sustainable economy. Here we report on the effects of the metal oxide support (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">γ</mi></semantics></math></inline-formula>-Al<sub>2</sub>O<sub>3</sub>, alumina-ceria-zirconia (ACZ) and ceria-zirconia (CZ)) on the low-temperature (ca. 500–750 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>∘</mo></msup></semantics></math></inline-formula>C) DRM activity, selectivity, resistance against carbon deposition and iridium nanoparticles sintering under oxidative thermal aging. A variety of characterization techniques were implemented to provide insight into the factors that determine iridium intrinsic DRM kinetics and stability, including metal-support interactions and physicochemical properties of materials. All Ir/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">γ</mi></semantics></math></inline-formula>-Al<sub>2</sub>O<sub>3</sub>, Ir/ACZ and Ir/CZ catalysts have stable DRM performance with time-on-stream, although supports with high oxygen storage capacity (ACZ and CZ) promoted CO<sub>2</sub> conversion, yielding CO-enriched syngas. CZ-based supports endow Ir exceptional anti-sintering characteristics. The amount of carbon deposition was small in all catalysts, however decreasing as Ir/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">γ</mi></semantics></math></inline-formula>-Al<sub>2</sub>O<sub>3</sub> > Ir/ACZ > Ir/CZ. The experimental findings are consistent with a bifunctional reaction mechanism involving participation of oxygen vacancies on the support’s surface in CO<sub>2</sub> activation and carbon removal, and overall suggest that CZ-supported Ir nanoparticles are promising catalysts for low-temperature dry reforming of methane (LT-DRM). |
| format |
article |
| author |
Ersi Nikolaraki Grammatiki Goula Paraskevi Panagiotopoulou Martin J. Taylor Kalliopi Kousi Georgios Kyriakou Dimitris I. Kondarides Richard M. Lambert Ioannis V. Yentekakis |
| author_facet |
Ersi Nikolaraki Grammatiki Goula Paraskevi Panagiotopoulou Martin J. Taylor Kalliopi Kousi Georgios Kyriakou Dimitris I. Kondarides Richard M. Lambert Ioannis V. Yentekakis |
| author_sort |
Ersi Nikolaraki |
| title |
Support Induced Effects on the Ir Nanoparticles Activity, Selectivity and Stability Performance under CO<sub>2</sub> Reforming of Methane |
| title_short |
Support Induced Effects on the Ir Nanoparticles Activity, Selectivity and Stability Performance under CO<sub>2</sub> Reforming of Methane |
| title_full |
Support Induced Effects on the Ir Nanoparticles Activity, Selectivity and Stability Performance under CO<sub>2</sub> Reforming of Methane |
| title_fullStr |
Support Induced Effects on the Ir Nanoparticles Activity, Selectivity and Stability Performance under CO<sub>2</sub> Reforming of Methane |
| title_full_unstemmed |
Support Induced Effects on the Ir Nanoparticles Activity, Selectivity and Stability Performance under CO<sub>2</sub> Reforming of Methane |
| title_sort |
support induced effects on the ir nanoparticles activity, selectivity and stability performance under co<sub>2</sub> reforming of methane |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/c38799b5de534f2583ef32e883c1bb26 |
| work_keys_str_mv |
AT ersinikolaraki supportinducedeffectsontheirnanoparticlesactivityselectivityandstabilityperformanceundercosub2subreformingofmethane AT grammatikigoula supportinducedeffectsontheirnanoparticlesactivityselectivityandstabilityperformanceundercosub2subreformingofmethane AT paraskevipanagiotopoulou supportinducedeffectsontheirnanoparticlesactivityselectivityandstabilityperformanceundercosub2subreformingofmethane AT martinjtaylor supportinducedeffectsontheirnanoparticlesactivityselectivityandstabilityperformanceundercosub2subreformingofmethane AT kalliopikousi supportinducedeffectsontheirnanoparticlesactivityselectivityandstabilityperformanceundercosub2subreformingofmethane AT georgioskyriakou supportinducedeffectsontheirnanoparticlesactivityselectivityandstabilityperformanceundercosub2subreformingofmethane AT dimitrisikondarides supportinducedeffectsontheirnanoparticlesactivityselectivityandstabilityperformanceundercosub2subreformingofmethane AT richardmlambert supportinducedeffectsontheirnanoparticlesactivityselectivityandstabilityperformanceundercosub2subreformingofmethane AT ioannisvyentekakis supportinducedeffectsontheirnanoparticlesactivityselectivityandstabilityperformanceundercosub2subreformingofmethane |
| _version_ |
1718411103273222144 |