Page 179 - CW E-Magazine (26-9-2023)

Special Report

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

Processes and Products

Catalytic Processes

Recent advances in catalytic
conversion of C5/C6 alkanes to
olefins

X. Wang and Y. Xu have reviewed this
subject in the contest of steam cracking
or catalytic cracking to make C H +
4
2
C H . There is the high yield of low-
3
6
value C-1 to C-3 alkanes. However,
when C /C alkanes are used then the
6
5
yields of C H + C H are high and C-1
2
6
3
4
to C-3 alkane yields are low. It would
be beneficial to first dehydrogenate
C-5/C-6 alkanes. (Catalysis Surveys
from Asia, 2022, 26, 245-260).
Chemical recycling of poly- Challenges and prospects in Hydrocarboxylation of olefins
ethylene (PE) the catalytic conversion of CO catalysed by polyoxometalate
2
to HCHO (POM)-anchored palladium
N.M. Wang et al have developed an single-atom catalysts
interesting and potentially useful tan- S. Zhao et al have summarised the
dem catalysis strategy where ethylene recent progress in the production of Y. Ma et al have reported the Keggin-
is used to convert PE to propylene. This HCHO from CO , including chemi- type POM-anchored Pd single-atom
2
involves olefin metathesis and rate-limi- cal catalysis – hydrogenation using H 2 catalysts – [(n-C H ) N)] [(SiW O Pd]
ting isomerisation. Both homogeneous and hydroboration/hydrosilylation, and [(n-C H ) N] [PW O Pd] for the
6
4
9 4
11
39
and heterogeneous catalysts are used. photo/electrocatalysis, and biocata- title reactions under two-phase condi-
4
9 4
5
11
39
The selectivity for C H is amazingly lysis (enzymatic reduction). Strategies tions. With styrene the yield of the car-
6
3
high at 94%. A semi-continuous mode for optimisation are reported. (Angew. boxylic acids could reach as high as
is suggested with the removal of C H . Chem. Intl. Ed.; DOI: 10.1002/anie. 95% at 110°C. The catalyst can be stored
3
6
(J. Amer. Chem. Soc., 2022, 144, 18526). 202204008).
under ambient atmosphere and can be
Olefins from syngas recycled. Tetrabutylammonium bromide
[This column has covered many papers (TBAB) played a crucial role. A wide
where syngas is converted to olefins/ range of substrates could be used. (ACS
alcohols and this is F-T process in petro- Sustainable Chem. Eng., 2022; DOI:
chemical mode.] 10.1021/acssuschemeng.2c04089).
H. Yu et al have realised a high selec- Oxidative cleavage of alkenes
tivity of 80% olefins with ultra-low by photosensitised nitroarenes
selectivity of CH and CO below 5%
4
2
and even with CO conversion of nearly T. Patra and T. Wirth have explored the
46%. Here, Na-promoted metallic Ru possibility of using photoexcited nitro-
nanoparticles is used; there is hardly arenes as modular and easily dosable
any water gas shift reaction. (Nat. Com- reagents, which can mimic the reacti-
mun., 2022, 13, 5987). vity of ozonolysis for the oxidative
Chemical Weekly September 26, 2023 179
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