scholarly journals A Cu–Pd single-atom alloy catalyst for highly efficient NO reduction

2019 ◽  
Vol 10 (36) ◽  
pp. 8292-8298 ◽  
Author(s):  
Feilong Xing ◽  
Jaewan Jeon ◽  
Takashi Toyao ◽  
Ken-ichi Shimizu ◽  
Shinya Furukawa
Keyword(s):  
Noble Metal ◽  
Low Temperatures ◽  
No Reduction ◽  
Single Atom ◽  
Minimum Amount ◽  
Highly Efficient ◽  
Highly Active ◽  
Alloy Catalyst ◽  
Single Atom Alloy

Highly active and selective NO reduction was achieved at low temperatures using a minimum amount of noble metal Pd.

scholarly journals Electrical Promotion-Assisted Automotive Exhaust Catalyst: Highly Active and Selective NO Reduction to N2 at Low-Temperatures

2021 ◽  
Author(s):  
Yuki Omori ◽  
Ayaka Shigemoto ◽  
Kohei Sugihara ◽  
Takuma Higo ◽  
Toru Uenishi ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Electric Field ◽  
Low Temperatures ◽  
No Reduction ◽  
Lattice Oxygen ◽  
Pd Catalyst ◽  
Highly Active ◽  
Automotive Exhaust Catalyst ◽  
Activated Surface

Pd catalyst (Pd/Ce<sub>0.7</sub>Zr<sub>0.3</sub>O<sub>2</sub>) in an electric field exhibits extremely high three-way catalytic activity (TWC: NO-C<sub>3</sub>H<sub>6</sub>-CO-O<sub>2</sub>-H<sub>2</sub>O). By applying an electric field to the semiconductor catalyst, low-temperature operation of TWC can be achieved even at 473 K by virtue of the activated surface-lattice oxygen.

Molybdenum diboride nanoparticles as a highly efficient electrocatalyst for the hydrogen evolution reaction

2017 ◽  
Vol 1 (9) ◽  
pp. 1928-1934 ◽  
Author(s):  
Palani R. Jothi ◽  
Yuemei Zhang ◽  
Jan P. Scheifers ◽  
Hyounmyung Park ◽  
Boniface P. T. Fokwa
Keyword(s):  
Hydrogen Evolution ◽  
Noble Metal ◽  
Hydrogen Evolution Reaction ◽  
Theoretical Studies ◽  
Highly Efficient ◽  
Highly Active ◽  
Molybdenum Sulfides ◽  
Molybdenum Boride ◽  
Metal Nanomaterials ◽  
Experimental And Theoretical Studies

Non-noble metal nanomaterials (molybdenum sulfides, phosphides, carbides, and nitrides) have recently emerged as highly active electrocatalysts for the hydrogen evolution reaction (HER). Here we present experimental and theoretical studies of the first highly active molybdenum boride nanomaterial for the HER.

scholarly journals First-principles design of a single-atom–alloy propane dehydrogenation catalyst

Science ◽  
2021 ◽  
Vol 372 (6549) ◽  
pp. 1444-1447
Author(s):  
Ryan T. Hannagan ◽  
Georgios Giannakakis ◽  
Romain Réocreux ◽  
Julia Schumann ◽  
Jordan Finzel ◽  
...  
Keyword(s):  
Surface Science ◽  
First Principles ◽  
Heterogeneous Catalysts ◽  
A Priori ◽  
Propane Dehydrogenation ◽  
Single Atom ◽  
Low Carbon ◽  
Activation Barriers ◽  
Highly Active ◽  
Single Atom Alloy

The complexity of heterogeneous catalysts means that a priori design of new catalytic materials is difficult, but the well-defined nature of single-atom–alloy catalysts has made it feasible to perform unambiguous theoretical modeling and precise surface science experiments. Herein we report the theory-led discovery of a rhodium-copper (RhCu) single-atom–alloy catalyst for propane dehydrogenation to propene. Although Rh is not generally considered for alkane dehydrogenation, first-principles calculations revealed that Rh atoms disperse in Cu and exhibit low carbon-hydrogen bond activation barriers. Surface science experiments confirmed these predictions, and together these results informed the design of a highly active, selective, and coke-resistant RhCu nanoparticle catalyst that enables low-temperature nonoxidative propane dehydrogenation.

Selectivity for ethanol partial oxidation: the unique chemistry of single-atom alloy catalysts on Au, Ag, and Cu(111)

2019 ◽  
Vol 7 (41) ◽  
pp. 23868-23877 ◽  
Author(s):  
Hao Li ◽  
Wenrui Chai ◽  
Graeme Henkelman
Keyword(s):  
Partial Oxidation ◽  
Single Atom ◽  
Highly Active ◽  
Strong Binding ◽  
Alloy Catalysts ◽  
Single Atom Alloy

Doping of a strong-binding single-atom element into inert close-packed substrates leads to highly active and selective initial dehydrogenation at the α-C–H site of adsorbed ethanol.

Catalytic activity of Pd-doped Cu nanoparticles for hydrogenation as a single-atom-alloy catalyst

2014 ◽  
Vol 16 (18) ◽  
pp. 8367-8375 ◽  
Author(s):  
Xinrui Cao ◽  
Qiang Fu ◽  
Yi Luo
Keyword(s):  
Catalytic Activity ◽  
Single Atom ◽  
Cu Nanoparticles ◽  
Extended Surfaces ◽  
Alloy Catalyst ◽  
Single Atom Alloy

The concept of single atom alloy that comes from extended surfaces can be effectively applied to nanoscales.

scholarly journals Electrical promotion-assisted automotive exhaust catalyst: highly active and selective NO reduction to N2 at low-temperatures

2021 ◽  
Author(s):  
Yuki Omori ◽  
Ayaka Shigemoto ◽  
Kohei Sugihara ◽  
Takuma Higo ◽  
Toru Uenishi ◽  
...  
Keyword(s):  
Low Temperature ◽  
Electric Field ◽  
Low Temperatures ◽  
No Reduction ◽  
Automotive Exhaust ◽  
Highly Active ◽  
Automotive Exhaust Catalyst

Low-temperature operation of TWC can be achieved even at 423 K by applying an electric field to the semiconductor catalyst.

scholarly journals Identification of single Ru(II) ions on ceria as a highly active catalyst for abatement of NOx pollutants

2021 ◽  
Author(s):  
Konstantin Khivantsev ◽  
Nicholas R. Jaegers ◽  
Hristiyan A. Aleksandrov ◽  
Libor Kovarik ◽  
Inhak Song ◽  
...  
Keyword(s):  
Noble Metals ◽  
No Reduction ◽  
Supported Catalyst ◽  
No Oxidation ◽  
Single Atom ◽  
No Reduction By Co ◽  
Highly Active ◽  
Ceria Support ◽  
Potential Applicability

Atom trapping allows to prepare catalysts with atomically dispersed Ru ions anchored to the ceria support. The resulting catalysts free of expensive noble metals such as Pt, Pd, Rh (whose prices are ~8-60 times higher than Ru on the per-molar basis) with Ru loadings of only 0.25-0.5 wt% show excellent activity in industrially important catalytic NO oxidation reaction, a critical step that requires use of relatively large loadings of expensive noble metals in diesel aftertreatment systems. Ru1/CeO2 catalysts are stable during continuous cycling, ramping and cooling as well as presence of moisture. Furthermore, Ru1/CeO2 shows excellent NOx storage properties during cold start, with improved NO adsorption compared with the best described Pd/Zeolite NO adsorbers with ~2-3 times higher Pd loadings. We clarify the location of Ru(II) ions on the ceria surface and identify mechanism of NO oxidation (as well as reactive storage) using DFT calculations and in-situ DRIFTS/Mass-spectroscopy measurements. Furthermore, we show the possible applications of Ru1/CeO2 in gasoline engines for NO reduction by CO: only 0.1 wt% of atomically dispersed Ru is sufficient to achieve high activity at low temperatures. With the aid of excitation-modulation in-situ infra-red measurements, we uncover the elementary steps of NO reduction by CO on an atomically dispersed ceria-supported catalyst. Our study highlights the potential applicability of single-atom catalysts to industrially relevant NO and CO abatement.

scholarly journals Electrical Promotion-Assisted Automotive Exhaust Catalyst: Highly Active and Selective NO Reduction to N2 at Low-Temperatures

2021 ◽  
Author(s):  
Yuki Omori ◽  
Ayaka Shigemoto ◽  
Kohei Sugihara ◽  
Takuma Higo ◽  
Toru Uenishi ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Electric Field ◽  
Low Temperatures ◽  
No Reduction ◽  
Lattice Oxygen ◽  
Pd Catalyst ◽  
Highly Active ◽  
Automotive Exhaust Catalyst ◽  
Activated Surface

Pd catalyst (Pd/Ce<sub>0.7</sub>Zr<sub>0.3</sub>O<sub>2</sub>) in an electric field exhibits extremely high three-way catalytic activity (TWC: NO-C<sub>3</sub>H<sub>6</sub>-CO-O<sub>2</sub>-H<sub>2</sub>O). By applying an electric field to the semiconductor catalyst, low-temperature operation of TWC can be achieved even at 473 K by virtue of the activated surface-lattice oxygen.

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