Page 170 - CW E-Magazine (27-2-2024)

Special Report

data science; and a catalysts informa- Pd/CeO -4.72 nm catalyst gave AB
2
tics platform. These authors have taken yield of 70%. (Catalysis Commun.,
the example of methane oxidation to 2023, 182, 106748; DOI: 10.1016/j.
discuss this strategy. The work covers catcom.2023.106748).
big data generation via high throughput
experiments, machine learning, cata- Selective catalytic oxidation of
lysts network method, catalyst design ethylbenzene (EB) to aceto
from small data, catalysts informatics phenone (ACP)
platform, and the future of catalysts
informatics via ontology. (Chemical K. Trangwachirachai et al have worked M.O. Azeez et al have given a review
Commun., 2023; DOI: 10.1039/D2C- on these two stable molecules with of catalyst systems and reaction mecha-
C05938J). daunting C-H and N bond energies of nisms of the title conversion. ACP is
439 and 945 kJ per mole, respectively. used in making many pharmaceuti-
Solar-to-H O catalysed by MoC wt % was 1, 5, and 10 and experi- cals, agrochemicals, food and cosmetic
x
2
2
Covalent Organic Frame- ments were at atmospheric pressure. products. Recent advances in homo-
At Mo loading of 1 wt%, CH conver-
geneous and heterogeneous systems
4
works (COFs) sion of 26%, the TOF of ACN was 15.3 are covered. Even a single atom is con-
-1
hr , at 750°C. To overcome coking, H sidered. (Ind. Eng. Chem. Res., 2023;
2
Z. Yong and T. Ma have referred to was co-fed and activity was ok up to 50 DOI: 10.1021/asc.iecr.3c01588).
COFs, as having excellent structural hours. (Cat. Sci. Technol., 203; DOI:
tenability, robust framework and are 10.1039/D3CY00585B). MOFs as versatile catalysts
widely recognised as promising photo-
catalysts. H O synthesis has been Integration of nano-sized MOFs offer areas which can be in
2
2
HZSM-5 with ZnZrO as a excess of 2,000-sq.m. per gm (more than
x
bifunctional catalyst to boost activated carbon and zeolites).
benzene alkylation with CO
and H 2 R.E. Malekshah et al have discussed
2 synthesis strategies and applications in
L. Yin et al have worked on the title value-added products. MOFs have
reaction to make toluene and xylene. The favourable physicochemical properties,
synergetic role of the title catalysts is
discussed, along with the proportions
of the two catalysts. At 31% conversion
of benzene, the combined selectivity of
toluene and xylene was 94.6%. Further.
the selectivity for ethylbenzene was
covered from 2020. Numerous COFs- below 1%. Catalyst stability problems
based photocatalysts have been deve- are discussed. (ACS Sustainable Chem.
loped with encouraging achievements. Eng., 2023; DOI: 10.1021/acssuschem-
Future advances in this field are dis- eng.3co2375).
cussed with respect to improved effi- Nitrobenzene (NB) reduction
ciency. (Angew. Chem. Intl. Ed.; DOI:
10.1002/anie.202308980). to azoxybenzene (AB)
J. Wang et al have worked to get high
Co-activation of CH and N to yields of AB, under solvent-free con-
4
2
acetonitrile (ACN) over MoC / ditions. Pd/CeO catalysts were used,
2
Al O catalysts x which inhibited further reduction of
3
2
[This is an interesting study. We already AB and mechanism is given. Reduc-
know CH + NH going to HCN tion of NB can give nitrosobenzene,
3
4
(Andrussov process), which is prac- AB, azobenzene and aniline and get-
ticed on a large scale.] ting selectivity to AB is a challenge.
170 Chemical Weekly February 27, 2024

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