Page 179 - CW E-Magazine (14-11-2023)

Special Report

A rapid wrap-up of what’s new in Operations,

Processes and Products

state strength influences the type of oxi-
dation, i.e., dehydrogenation of primary
and secondary alcohol groups or oxygen
transfer to aldehyde for dehydrogenation
reactions than for oxidation reactions. By
contrast PtOx is equally active for both
reactions. Thus, PtO realised selectivity
of the primary alcohol group; PtOx also
promotes the dehydrogenation of secon-
dary alcohol groups giving complex
reaction mixtures. (Angew. Chem. Intl.
Ed.; DOI: 10.1002/anie.202306701).
Alternating current electrolysis
for individual synthesis of metha-
nol and ethane from CH in a
4
Electrochemical processes close carbon footprint. A new mechanism thermo-electrochemical cell
[These processes are getting attention to overcome the inertness of the nitrogen
due to the availability of renewable molecule by elongating N≡N to realize T. Hibino et al have studied the individual
power in a distributed way and this one-step C-N coupling in the process for synthesis of methanol and ethane from
column has covered some papers as urea production. A Zn-Mn diatomic cata- CH using a thermo-electrochemical cell
4
“electrons” are clean.] lyst with axial chloride coordination was in gas flow mode over the temperature
constructed. Thus, NH synthesis as an range of 150-200°C. CH was directly
3
4
Electrocatalytic urea synthesis intermediate is avoided. Isotope labelled oxidised at an anode consisting of sub-10 nm
with 63.5% Faradaic efficiency measurements and operando synchrotron Pt and Fe particles. Separately, in the
and 100% N-selectivity via one- radiation Fourier transform IR spectro-
step C-N coupling scopy validated the activation of N-N
triple bond and N fixation. (Angew. Chem.
X. Zhang et al have come out with a Intl. Ed.; DOI: 10.1002/anie.2023 05447).
potentially useful method of coupling
N and CO to mitigate energy crisis and Steering the selectivity of elec-
2 2 trocatalytic glucose (G)
oxidation by the Pt oxida-
tion state electrolysis of humified CH , CH OH was
3
4
produced through the formation of active
M.P.J. Maria van der Han et oxygen intermediates from water vapour.
al have referred to electrocata- In unhumified CH , C H was formed via
2
6
4
lytic oxidation for high value the dissociation of C-H bonds, followed
chemicals. However, it is highly by dimerisation of the resultant -CH
3
desirable to improve selectivity. radicals. Direct current based process
High-pressure liquid chromato- resulted in decrease in the desired pro-
graphy and high-pressure anion ducts with time due to over-oxidation
exchange chromatography were at the anode. This was corrected by
adopted to study the role of the Pt using alternating current electrolysis.
oxidation state in affecting activity (ACS Catal., 2023, 13, 8890-8901; DOI:
and selectivity. Thus, Pt oxidation 10.1021/acscatal.3c01333).

Chemical Weekly November 14, 2023 179

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