Page 183 - CW E-Magazine (14-11-2023)

Special Report

catalytic activity for electro-oxidation of Electrochemical CaC -mediated Selective conversion of propane
2
urea/KOH aqueous solutions, producing conversion of biochar to C H by electro-thermal catalysis in
H , N , and CO using the SPE cell with 2 2 proton exchange membrane
2
2
2
an anion exchange membrane (Sustain- J. Zhang et al have referred to the com- fuel cell
ion X-37). Faradaic efficiency was high. monly practiced way of making CaC
2
With a two-compartment SPE cell only from CaO at high temperature having C.H. Yang et al have worked on the
H was obtained. Characterisation studies low carbon efficiency, harmful gas con- conversion of propane to high value-added
2
were carried out (ACS Sustainable Chem. tamination, high risk CO management, oxygenated products under a mild con-
Eng., 2023; DOI: 10.1021/acssusche- etc. These authors have reported a high dition. Here electrocatalysis of H O
2
2
meng.3c02016). C efficiency, almost 100% of biochar to with the thermos-catalysis is done in a
proton exchange membrane fuel cell.
Electrochemical processes for H O is generated in-situ. The space-
lactic acid from glycerol and time yield of C oxygenated products
2
2
3
conversion of ethylene glycol of propane oxidation reached 2.65 mol
from base-catalysed hydrolysis per hr per sq.cm. This is a new develop-
of PET to glycolic acid (GA) ment (ChemSusChem., DOI: 10.1002/
cssc.2023006699).
Y. Yan et al have reported the title pro-
cesses using Au/Ni(OH) as electrocata- Ondansetron (O) (Zofram) – A
2
lyst. GA formation can be explained by WHO-approved drug for can-
electrocatalytic oxidation of glycerol; C H through an electrolytic synthesis cer patients
2
2
ethylene glycol requires two oxidative of solid CaC in molten CaCl /KCl/CaO
2
2
at 700°C; Cl evolved at an inert anode. There is an attempt to make O by a con-
2
Electrolysis removes S and P from the tinuous process and Y. Hatu and T.Jami-
solid cathode, thus avoids formation of son have reported a method based on
CaS and Ca P in CaC , which avoids condensation of 1,3-cyclohexanedione
2
2 2
generation of H S and PH and produces and N-methylaniline followed by further
2
3
C H (Angew. Chem. Intl. Ed.; DOI: steps involving Mannich reaction and
2
2
10.1002/acie.202301479).
eventually substitution with 2-methyl-
steps with a base-catalysed hydrate for- Long-chain polyamine-glyoxal imidazole (Reaction Chem. Eng., 2023;
mation occurring between them (J. Am. (G) wood adhesive; formalde- DOI: 10.1039/D3RE 00249G).
Chem. Soc., 2023, 145, 6144). hyde-free, green synthesis, and An overview of the recycling of
ultra-performances
Urea electrosynthesis in micro- waste PVC
bial electrolysis cells using low S. Jiang et al have referred to the health X. Jiang et al have referred to the steady
cost Fe-N-C for simultaneous N hazards of formaldehyde-based adhe- increase in the volume of PVC owing
and CO reduction 2 sives. It seems urea-G and melamine-G to its feature of non-biodegradability.
2 do not seem to deliver the desired
Y. Huang et al come out with an interest- adhesion property due to cyclisation reac- The solid waste disposal needs more
attention and a considerable progress has
ing and potentially useful way of making tions. To avoid cyclisation a long-chain been made for recycling. Non-conven-
urea electrochemically. This was done in melamine-1,6-hexanediamine (MHD) tional mechanical recycling is referred.
a dual-chamber microbial electrolysis polymer with used with G via a facile Advantages and disadvantages of different
cell with low energy consumption to and clean strategy. These adhesives have
simultaneously degrade organic matter a lower cure temperature, much higher
in wastewater and directly use it for bonding strength, and far superior water
agricultural purposes. Bifunctional title resistance. The outstanding performance
catalyst allowed electroreduction of N appear to be due to easy formation of
2
and CO to urea at 0.156 mol per gm per highly stable conjugated imine bonds
2
hour and Faradaic efficiency of 2.13%. (-N=C-C=N-) (ACS Sustainable Chem.
(Ind. Eng. Chem. Res., 2023; DOI: Eng., 2023; DOI: 10.1021/acssusche-
10.1021/acs.iecr.3c01916). meng.3c04378).
Chemical Weekly November 14, 2023 183

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