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Special Report

can dissolve Zn(OAc) catalyst. 100% Propane dehydrogenation
2
depolymerisation is reported, yield- (PDH)
ing more than 90% of PET monomer [In USA, ethylene is produced from
at 170°C. (Green Chem., 2023; DOI: ethane and hence propylene availabi-
10.1039/D3GC03125J). lity, unlike in naphtha cracking, poses
problems. Hence, PDH has come centre-
State-of-the art advancements stage and a number of plants globally
in synthesis of nitriles from have come-up and capacity has gone
primary alcohols up to 750,000-tpa. In India, we will
[This column has covered some papers see PDH plant of GAIL in Usar,
on this subject, e.g., ethanol to aceto- Maharashtra, at 500,000-tpa and the support Pd nanoparticles for an effi-
nitrile.] recently announced Petronet LNG cient title hydrogenation. The role of
plant of 750,000-tpa.] catalyst supports, their porosity, and
P. Wu et al have covered the research reaction conditions was studied. Micro-
progress in the methodologies for the Recently researchers at the US Argonne mesoporous carbon (MAC) based Pd
title conversion, e.g., via conventional National Lab and Ames National Labo- catalyst gave 99% conversion with
thermal homogeneous catalysis and ratory have come out with a faster and 99% yield of piperidine. Catalyst was
heterogeneous catalysis. Emerging photo- more energy efficient process. Zr on sili- studied with five cycles. (Ind. Eng.
catalysis and electrocatalysis are also con nitride catalyst is used, in place of Chem. Res., 2024; DOI: 10.1021/acs.
Cr or Pt on a support like alumina. This iecr.4c02317).
catalyst also works at lower tempera-
ture than the contemporary processes. Direct Synthesis of H O
2
2
(J. Am. Chem. Soc., 2024, 146, No. 21, [This dream process of H + O going to
2
2
1443). H O continues to attract attention as
2
2
this will be the cheapest and ecofriendly
Reverse water gas shift process.]
reaction
L. Fu et al have come out with AuCu@
The reduction of CO with H to give AuPd core-shell catalysts with a Cu-
2
2
covered. Many aspects are reviewed, CO + H O is gaining a lot of im- enriched core and highly dispersed Pd sites
2
e.g., reaction mechanisms, substrate portance due to upgrading of CO . on the alloy surface. AuCu @AuPd
2
1.5
compatibility. (ACS Catalysis, 2024; However, this remains economically catalyst gave H O selectivity of 89.5%
2
2
DOI: 10.1021/acscatal.4c04460). challenging due to lack of an inex- under ambient pressure. An explanatory
pensive, active, highly selective and note is given for the performance of the
Unveiling the potential of stable catalyst. Nanocrystalline cubic catalyst. (Ind. Eng. Chem. Res., 2024;
heterogeneous systems for molybdenum carbide (α-Mo C) has DOI: 10.1021/acr.iecr.4c03246).
2
reversible H storage in liquid been reported to give 100% selective
2
organic H carriers conversion to CO and has been tested Single-atom barium (Ba)
2
2
for 500 hours even at 600°C. This promoter enormously
B.R. Jagirdar and J. Jangir have brought behaviour of the catalyst is attributed enhanced non-noble
out the utility of liquid H carriers and to crystallographic phase purity, weak metal catalyst for NH
2
systems like methylcyclohexane/toluene, Co-Mo C interactions, and interstitial decomposition 3
2
and H-18-dibenzyltoluene/dibenzyl- oxygen atoms, respectively. DFT cal- [NH is becoming an important H
3
2
toluene. These have been considered culations were done. (M.A. Khoshooei carrier as there is well defined NH
3
for large scale applications. The dehydro- et al, Science, 2024, 384, p. 40; cf Chem. transportation system globally. Thus,
genation is endothermic and poses Ind. 2024, Sep. p. 43). decomposition of NH to H becomes
problems. Multifunctional hetero- important.] 3 2
geneous catalysts are discussed and Hydrogenation of pyridine (P)
include mono-/dimetallic and pincer K. Xu et al have prepared Ba single
complexes, etc. (ChemSusChem., 2024; J. Wang et al have reported construc- atoms in situ in the Co-Ba/Y O cata-
3
2
DOI: 10.1002/cssc.202402018). tion of hierarchical porous carbon lyst with crystallised BaCO as the
3
Chemical Weekly January 28, 2025 169
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