Page 180 - CW E-Magazine (14-11-2023)

Special Report

Boosting alkaline H evolution the critical issue of poisoning caused concentration of peroxocarbonate was
2
reaction through water struc- by insoluble S species formed during 64.7-mol/dm with a current efficiency of
3
ture manipulation the SOR. S-tolerant electrocatalysts are 19.2%. (Chem. Eng. Process – Process
covered. Current challenges and future Intensification, 2023, 191, Sep., 109468;
Y. Jiao and Y. Zheng have referred to a research are discussed. (Chem. Eng. DOI: 10.1016/j.cep.2023.109468).
recent breakthrough, which shows that Jl., 2023, 469, 1 August, 143861; DOI: Electrocatalysis as an efficient
the performance can be improved by 10.1016/j.cej.2023143861).
manipulating water structure at the elec- alternative to thermal catalysis
trode-electrolyte interface using atomi- Anodically-generated alkyl radi- over PtRu bimetallic catalysts
cally localised electric fields. IrRu Dizy- cals derived from carboxylic for hydrogenation of benzoic
gotic Single-Atom Sites (DSAC) carries acid as reactive intermediates acid derivatives
for addition to alkenes
Y. Du et al have referred to the title pro-
H. Ding and M. Orazov have reported cess, which involves mild conditions for
electrochemically driven C-C coupling. ring hydrogenation. PtRu supported on
Low anodic current density favours the carbon paper was developed and this gave
formation of the target product, but also conversion of 92.9% and high selectivity
leads to more solvent oxidation, which of 100% and a high Faradaic efficiency
can be suppressed by multiple methods
to get high Faradaic efficiency of the
targeted product with high selectivity.
Thus, the reaction is CH (CH ) COOH
3
2 n
out the above work. Water dissociation via Kolbe to CH (CH ) , reacting with
3
2 n
kinetics was studied and an intricate styrene, Ph-CH=CH , to give in methanol,
2
examination of the interaction between PhC(O-)[CH ) . Radical self-coupling
2 n
water molecules and the catalyst surface can be avoided. In the above reaction,
was also studied. (Angew. Chem. Intl. 88% selectivity and 72% Faradaic effi-
Ed.; DOI: 10.1002/abue.2023 07303). ciency was realised. (ChemElectroChem of 62.2% leading to cyclohexane carboxy-
2023; DOI: 10.1002/cec.2022 01099). lic acid in an acidic aqueous electrolyte
Electrochemical H S splitting without external H . The catalyst has
2
2
[H S is extensively valorised via Claus Peroxocarbonate production outstanding stability. Theoretical calcu-
2
Process to make sulphur (S) and almost by using a divided cylindrical lations were done. (Green Chem., 2023;
all S globally is recovered, rather than electrochemical reactor DOI: 10.1039/D3G 01540H).
mined. Many attempts are being made
to get H + S from H S.] O. Gonzalez and J.M. Bisang have Highly selective separation of
reported the title reaction where a cati-
2
2
+
K. Kim and C. Lee have referred to onic exchange membrane is used and Cs from brines using an electro
active layered composite of
water splitting electrochemically, which the anode was a Pt helical wire. The vanadosilicate
is severely impeded by the sluggish O cathodic reaction was either O reduction
2
2
evolution reaction (OER) occurring on by using a rotating reticulated vitreous Y. Bian et al have reported a green and
the anode. By contrast, electrochemical carbon or H evolution at Ni or platinised sustainable separation and recovery of
2
sulphide oxidation reaction (SOR) has Ti static electrodes. Best results were Cs from brine in a novel electrochemical
+
3
greater thermodynamic and kinetic with 1-mol/dm Na CO solution in the method. Here, layered vanadosilicate
3
2
advantages. This combination of the anodic compartment at a current density composite was employed. In this method
2
+
SOR with H evolution reaction (HER) of 140 mA/cm and 10°C. The maximum the adsorption and desorption of Cs on
2
can well permit H S splitting to simulta- the electrode can be easily controlled
2
neously generate green H by lowering via the redox reactions of V. Thus, a
2
+
the energy input. These authors have good-to-excellent selectivity of Cs /K ,
+
+/
2+
+
covered recent developments in this Cs /Ca , Cs Mg can be realised with
2+
much desired process. Attention has separation factors of 11.7, 28.9 and 181.4,
been given to strategies that can mitigate respectively. The coated electrode was
180 Chemical Weekly November 14, 2023
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