Page 168 - CW E-Magazine (26-3-2024)

Special Report

heterogeneous nature of the catalyst is
demonstrated and was used in four con-
secutive cycles. (Ind. Eng. Chem. Res.,
2023; DOI: 10.1021/acs.iecr.3C02633).

Relatively electron-rich Ni
nanoparticles supported on
alpha-Al O for high-effi ciency
3
2
hydrogenolysis of lignin (L)
and its derivatives under mild
conditions

W. Jiang et al have worked on various
Ni-based catalysts for the C-O bond Unlocking the graphitisation multi-step, heterogeneous one-pot, or
hydrogenolysis of L-derived diphenyl potential of lignin (L) flow chemistry catalytic approaches.
ether and benzyl phenyl ether. 10% (Green Chem,. 2023; DOI: 10.1039/
Ni/α-Al O shows the highest activity W. Qu et al have brought-out the D3GC04082H).
3
2
that too at low H pressures. This cata- great potential of L for graphitisation. Recent advances in hydrotropic
2
lyst also achieves the depolymerisation These authors have used a simple yet solvent systems (HSS) for ligno-
of real L to product guaiacol with high effective method of pre-treatment using cellulosic biomass utilisation
yield. (ACS Sustainable Chem. Eng., hot pressing L, which made it a more
2023; DOI: 10.1021/acssuschemeng. favourable material for graphitisation. S. Jeong et al have reported that HSS
3C04713). At only 1000°C the carbonised L-15t have shown effective biomass fraction-
exhibited a clearly oriented graphitised ation performance due to their unique
Production of oximes directly structure with the d spacing of 0.3454- amphiphilic structure. Here lignin is
002
from sustainable, lignocellu- nm. At 1600°C, the carbonised L-15t separated from the cellulose-rich frac-
losic-derived aldehydes and realised graphitisation degree of about tion with minimum modifi cation and
ammonia over HTS-2 catalyst 48% (This method deserves attention). maximum recovery. HSSs work in mul-
(Green Chem., 2023; DOI: 10.1039/ tiple ways, and the benefi ts arise out of
W. Zheng et al have referred to oxime D3GC.03642A). aqueous processing. Current challenges
chemicals as building blocks of many and industrial applications and perspec-
anti-cancer drugs and are widely used. Chemocatalytic production of tives are covered. (Green Chem., 2023;
Hierarchically porous zeolites catalyst, sorbitol (S) from cellulose via DOI: 10.1039/D3GC03309K).
HTS-2, was prepared and used for mak- sustainable chemistry
ing vanillin oxime (VO) from vanillin in Organosolv biorefinery: re-
NH . H O/DIO (v/v 1/10) system. Larger Y. Zhou et al have referred to the many source-based process optimi-
2
3
pore size of the catalyst allowed 99% uses of S and it is advantageous to make sation, pilot technology scale-up
yield of VO. Here the rate-controlling it from cellulose directly, than from and economics
step was the formation of hydroxyl- glucose. These authors have reviewed
amine. This method could be extended this subject with the aim of sustainable G. Tofani et al have reviewed this
to the other products based on lignin, chemistry. The feedstocks considered important subject where various ligno-
such as syringaldehyde oxime and even included isolated cellulose solids, cellulosic materials are fractionated,
furfural oxime. (ChemSusChem; DOI: pre-treated biomass, and raw lignocel- selective depolymerisation mechanism
10.1002/cssc.202301364). lulosic biomass that use homogeneous are catalysed and main components
can be extracted, separated and isolated
using liquid organic solvents such as
alcohols, ketones and proton-donating acid
molecules. Several renewable biomasses
can be considered and pure components
are used to make valuable chemicals,
polymers and biomaterial compositions.

168 Chemical Weekly March 26, 2024

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