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Highly dispersed rhodium atoms supported on defect-rich Co(OH) 2 for the chemoselective hydrogenation of nitroarenes
Catalysts of 0.54% (Pt, Rh, Pd or Ru)/Co(OH) 2 and 1.23% Rh/Co(OH) 2 were successfully synthesized via simple hydrothermal and precipitation methods for the selective hydrogenation of nitroarenes. It was found that 0.54% Rh/Co(OH) 2 outperformed other catalysts, for example, 2-chloronitrobenzene hyd...
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Published in: | New journal of chemistry 2022-01, Vol.46 (3), p.1158-1167 |
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Main Authors: | , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Catalysts of 0.54% (Pt, Rh, Pd or Ru)/Co(OH)
2
and 1.23% Rh/Co(OH)
2
were successfully synthesized
via
simple hydrothermal and precipitation methods for the selective hydrogenation of nitroarenes. It was found that 0.54% Rh/Co(OH)
2
outperformed other catalysts, for example, 2-chloronitrobenzene hydrogenation (with a turnover frequency (TOF) of 575 h
−1
) under 3.0 MPa H
2
at 100 °C for 1 h (much higher than that of 1.23% Rh/Co(OH)
2
; TOF, 398 h
−1
). Through characterization of the nanostructure (XRD, TEM, HRTEM, AC-STEM (spherical aberration-corrected scanning transmission electron microscopy), AC-STEM-EDX elemental mapping and line-scanning, H
2
-TPD,
etc.
), it was confirmed that Rh was dispersed in the form of single atoms and ultrasmall nanoclusters on Co(OH)
2
for 0.54% Rh/Co(OH)
2
. Moreover, 0.54% Rh/Co(OH)
2
also exhibited high selectivity for –NO
2
hydrogenation for other selected nitroarene substrates hydrogenation reactions. This was mainly attributed to the presence of Rh as single atoms or super tiny nanoclusters in 0.54% Rh/Co(OH)
2
, leading to a significant increase in the number of active sites, beneficial adsorption of the –NO
2
-group at defect-rich Co(OH)
2
, and an interfacial synergy effect of Rh–Co(OH)
2
, thus improving the catalytic performance. |
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ISSN: | 1144-0546 1369-9261 |
DOI: | 10.1039/D1NJ04936D |