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Special Report Special Report

industrial synthesis process. Machine been reported at over 60%. In comparison in CO hydration. The catalyst was pre- Amoco, USA, had introduced. This
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learning model was adopted. The model with N , CO signifi cantly enhances the pared by the layer-by-layer method. column has duly covered this topic in
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is able to predict isomer ratios and yield of aromatics. The use of CO leads Kinetics of the reaction was studied. (ACS one of the earlier coverages.]
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selectivity of the reaction with mini- to formation of CO and CH . This is an Sustainable Chem. Eng., 2024; DOI:
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mising by-product quantities. (Chem. interesting and potentially useful strategy 10.1021/acssuschemeng.4c00659). H.N. Thomas et al have referred to the
Eng. Res. Des., 2024; DOI: 10.1016/j. to convert used polyolefi ns to aroma- oxidation of PX which proceeds via a
cherd.2024.07.035.208, August, 626- tics. (ACS Sustainable Chem. Eng. 2024; Challenges, prospects and redox cascade that involves Co, Mn, and
647). DOI: 10.1021/acssuschemeng.4c02858). comprehensive evolution of bromide, with synergy allowing for high
zeolite-based materials for the selectivity and reactivity. However, the
Propane to acrylic acid (AA) Catalytic CO hydration and catalytic conversion of glycerol hostile operative conditions pose some
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[There have been attempts to use pro- sequestration by carbonic an- (G) problems and these authors have used
pane in place of propylene for am- hydrase (CA)-mimetic nano- [The availability of G as a co-product DFT calculations to determine the static
moxidation to acrylonitrile and some tubes in the production of biodiesel has trig- and dynamic properties of the divalent
reports indicate this for adoption. Thus [Prof. Roughton, at Cambridge Univer- gered a lot of interest in valorising G (reduced) and trivalent (oxidised) Mn
it would be welcome to use propane in sity, had carried out pioneering work to give an array of products and this catalysts in the redox cascade. The thermo-
place of propylene for oxidation to AA New insights for high-through S. Gu et al have reported a highly active on CA in 1930’s and catalysis of CO - column has duly covered some papers.] dynamically stable coordination envi-
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even though it is a two-step process – CO hydrogenation to high- PEG-modifi ed HZSM-5 zeolite for the hydration and reverse reaction is of great ronments for Mn (II) and Mn (III) are
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fi rst to acrolein followed by another quality fuel title conversion, which has longer acti- importance in human body for exhaling F.F. Barbosa et al have reviewed the discussed. Further, molecular dynamic
catalyst for oxidation to AA.] vity than the available commercial cata- CO , particularly during exercise, and zeolite-based solid catalysts as promising simulations were done. This study pro-
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C. Wang et al have reported a pioneer- lysts. The method of synthesis is reported, was exploited in submarines and space catalysts for the conversion of G. The vides an account of the use of Mn in the
H. Qu et al have reported Cr-doped ing synthetic process that realises selec- which allowed the exposure of more programme for CO absorption in adequate tuning of pore size and zeo- catalyst system. (Catalysis Sci. Technol.,
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mesoporous M1 phase MoVTeNbO x tive production of high-volume com- Bronsted acid sites to HZSM-5 and faci- potassium carbonate solutions catalysed lite acidity holds key. Hierarchical zeo- 2024; DOI: 10.1039/D4CY00284A).
catalyst for the title reaction. The cata- mercial gasoline. Extremely brief gas litated the diffusion process of CE and by CA. Unfortunately, CA is not stable lites stand out due to the larger size and Hydroformylation and hydro-
lysts were prepared by spray drying residence times were adopted to give CH. With CE to water volume ratio of during desorption and hence attempts interconnection of the pore network. genation in biphasic systems
method, which gave unique spherical olefi ns and successive hollow zeolite 1:1, catalyst wt. of 35 wt%, about 16% are made to immobilise CA and this col- Conversion of G to acrolein, acetol, involving organometallic
morphology stacked by rod particles. HZSM-5 carried out aromatisation of conversion was realised and CH selec- umn has covered this work. A manifesta- acrylic acid, allyl alcohol, solketal, etc. complexes
Further details of the catalysts are given. olefi ns. Thus, the excessive hydrogena- tivity was 99.35%. The catalyst could be tion of CO hydration catalysis was the are covered. (Catalysis Today, 2025,
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An excellent performance is reported. tion of intermediates is effectively pre- recycled. (Ind. Eng. Chem. Res., 2024; use of K arsenite in fertiliser plants, with 444, 15 Jan, 114998; DOI: 10.1016/j. [Hydroformylation reaction (earlier
(Catalysis Surveys from Asia, 2024, 28, vented. (Angew. Chem. Intl. Ed., 2024; DOI: 10.1021/acs.iecr.4c01919). K CO , but had to be given up due to cattod.2024.114998). referred to as Oxo reaction) was fi rst
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231-242; DOI:10.1007/s10563-024-09- DOI: 10.1002/anie.202408275). environmental hazards of lakes of First principles investigation developed in Germany where very high
422-5). CO -assisted catalytic pyrolysis arsenite like in Goa, Vadodara, etc.] pressures were involved using Co cata-
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Cyclohexene (CE) hydration of polyolefi ns to aromatics of manganese catalyst struc- lyst. The breakthrough of Rh-based com-
Diols production from pyro- to cyclohexanol (CH) over mesoporous HZSM-5 and M. Kim et al have worked on the title ture and coordination in the plexes brought down pressures to below
lysis oil water-soluble (WS) [The selective hydrogenation of ben- Ga/ZSM-5 catalysts subject in the contest of the effi cient p-xylene (PX) oxidation 50 atm and this work got Nobel Prize.]
fraction zene to cyclohexene was ushered by sequestration of CO into metal carbo- process P.J. Baricelli et al have referred to the
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Asahi, Japan, which was a kind of J. Zhang et al have used CO as a mild nate minerals. The title CA catalyst has [The liquid phase oxidation of PX in title reaction where yet another break-
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D. Luo et al have worked on the title breakthrough. The hydration of CE to oxidiser to remove excessive H to expe- exhibited remarkable catalytic activity acetic acid medium was one of the through came using biphasic system
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cut and its conversion to ethylene gly- CH is commercially practiced by using dite the aromatisation of intermediate breakthrough and this was commercialised and have
col (EG) and propylene glycol (PG) a zeolite based catalyst.] alkanes and olefi ns. BTEX content has processes where reviewed this subject and latest contri-
using a hybrid catalyst, Ni-H WO . The the production is
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reaction was done at 180 C and levo- in multimillion
o
glucosan gave EG yield of about 54% tonnes per annum
and PG yield of 50.2%; a EG yield of (> 77-mtpa)
98.6% was obtained from glycolalde- where a combi-
hyde conversion. Simulated WS frac- nation of Co and
tion was also studied. The undesired Mn catalysts is
impurities like furans, phenolics and used. There is
cyclopentanones were removed from an elaborate ex-
WS fraction by C adsorption. (J. Chem. planation of the
Technol. Biotechnol., 2024; DOI: working of this
10.1002/jctb.7711). system which

180 Chemical Weekly November 12, 2024 Chemical Weekly November 12, 2024 181

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