Homoleptic Rhodium Pyridine Complexes for Catalytic Hydrogen Oxidation

A statistical description for the processes of catalytic hydrogen oxidation is proposed taking into account the reaction--diffusion processes for magnetoactive ions and atoms adsorbed on the metal surface. The basic non-Markov transfer equations are obtained for the abbreviated description parameters of reaction-diffusion processes for magnetoactive ions and atoms adsorbed on the metal surface in the method of nonequilibrium statistical Zubarev operator. Weakly nonequilibrium reaction-diffusion processes are also considered.

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Catalytic hydrogen oxidation using zeolite RHO modified by silver nanoparticles

Glass Physics and Chemistry ◽

10.1134/s1087659612050033 ◽

2012 ◽

Vol 38 (5) ◽

pp. 455-459 ◽

Cited By ~ 6

Author(s):

O. Yu. Golubeva ◽

N. Yu. Ternovaya ◽

N. V. Mal’tseva ◽

D. Meyerstein

Keyword(s):

Silver Nanoparticles ◽

Hydrogen Oxidation ◽

Catalytic Hydrogen ◽

Zeolite Rho

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Experimental assessment of a catalytic hydrogen oxidation system for the off-gas processing of the ITER WDS

Fusion Engineering and Design ◽

10.1016/j.fusengdes.2013.05.104 ◽

2013 ◽

Vol 88 (9-10) ◽

pp. 2332-2335

Author(s):

C. Plusczyk ◽

N. Bekris ◽

I. Cristescu ◽

N. Lohr ◽

R. Michling ◽

...

Keyword(s):

Hydrogen Oxidation ◽

Experimental Assessment ◽

Gas Processing ◽

Catalytic Hydrogen ◽

Oxidation System

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Grain-boundary-rich Pt nanoparticle assembly for catalytic hydrogen sensing at room temperature

10.26434/chemrxiv-2021-tm34c ◽

2021 ◽

Author(s):

LONG LUO ◽

Xin Geng ◽

Shuwei Li ◽

Jaeyoung Heo ◽

Yi Peng ◽

...

Keyword(s):

Grain Boundary ◽

Platinum Nanoparticles ◽

High Performance ◽

Room Temperature ◽

Hydrogen Oxidation ◽

Water Electrolysis ◽

Nanoparticle Assembly ◽

Platinum Nanoparticle ◽

Hydrogen Sensing ◽

Catalytic Hydrogen

We report a facile method of synthesizing grain-boundary(GB)-rich platinum nanoparticle assembly. GBs are formed between platinum nanoparticles during their random collision and attachment in solution driven by water electrolysis. The GB-rich nanoparticle assembly exhibits ~400-fold higher catalytic hydrogen oxidation rate than platinum nanoparticles before assembly, enabling catalytic hydrogen sensing at room temperature without external heating. Our sensor also demonstrates fast response/recovery (~7 s at >1% H2), nearly no signal variation during a 280-hour-long stability test, and high selectivity toward hydrogen over 36 interference gases. Furthermore, this sensor can be easily fabricated from commercial thermometers at a low cost (< $5 per unit). Theoretical calculation results reveal that the high performance of GB-rich platinum nanoparticle assembly arises from tensile strain at the GBs.

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Resolving multifrequential oscillations and nanoscale interfacet communication in single-particle catalysis

Science ◽

10.1126/science.abf8107 ◽

2021 ◽

pp. eabf8107

Author(s):

Y. Suchorski ◽

J. Zeininger ◽

S. Buhr ◽

M. Raab ◽

M. Stöger-Pollach ◽

...

Keyword(s):

Single Particle ◽

Active Sites ◽

Hydrogen Oxidation ◽

Frequency Locking ◽

Spatial Coupling ◽

Reaction Fronts ◽

Catalytic Hydrogen ◽

Field Electron Microscopy ◽

The Individual ◽

Oscillation Frequencies

In heterogeneous catalysis research, the reactivity of the individual nanofacets of single particle is typically not resolved. We applied in situ field electron microscopy (FEM) to the apex of a curved rhodium crystal (radius of 650 nanometers), providing high spatial (~2 nanometers) and time resolution (~2 ms) of oscillatory catalytic hydrogen oxidation, imaging adsorbed species and reaction fronts on the individual facets. Using ionized water as imaging species, the active sites were directly imaged by field ion microscopy (FIM). The catalytic behavior of differently structured nanofacets and the extent of coupling between them were monitored individually. We observed limited interfacet coupling, entrainment, frequency-locking, and reconstruction-induced collapse of spatial coupling. The experimental results are backed-up by microkinetic modelling of time-dependent oxygen species coverages and oscillation frequencies.

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Coexisting multi-states in catalytic hydrogen oxidation on rhodium

Nature Communications ◽

10.1038/s41467-021-26855-y ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

P. Winkler ◽

J. Zeininger ◽

M. Raab ◽

Y. Suchorski ◽

A. Steiger-Thirsfeld ◽

...

Keyword(s):

Steady State ◽

Hydrogen Oxidation ◽

Kinetic Modelling ◽

Mean Field ◽

Photoemission Spectroscopy ◽

Spatially Resolved ◽

Catalytically Active ◽

Catalytic Hydrogen ◽

Experimental Findings ◽

General Possibility

AbstractCatalytic hydrogen oxidation on a polycrystalline rhodium foil used as a surface structure library is studied by scanning photoelectron microscopy (SPEM) in the 10−6 mbar pressure range, yielding spatially resolved X-ray photoemission spectroscopy (XPS) measurements. Here we report an observation of a previously unknown coexistence of four different states on adjacent differently oriented domains of the same Rh sample at the exactly same conditions. A catalytically active steady state, a catalytically inactive steady state and multifrequential oscillating states are simultaneously observed. Our results thus demonstrate the general possibility of multi-states in a catalytic reaction. This highly unusual behaviour is explained on the basis of peculiarities of the formation and depletion of subsurface oxygen on differently structured Rh surfaces. The experimental findings are supported by mean-field micro-kinetic modelling. The present observations raise the interdisciplinary question of how self-organising dynamic processes in a heterogeneous system are influenced by the permeability of the borders confining the adjacent regions.

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