Page 172 - CW E-Magazine (23-7-2024)

Special Report Special Report

strategy has been adopted for two che- sites derived from W were found to be CH=CH to Ph-CH -CH . A stable and
6+
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mo-enzymatic cascade reactions for advantageous to give 1,3-propanediol on active catalyst is reported. MOF is fi rst
synthesis of chiral cyanohydrins and Pt/CuWO catalyst. (Applied Catalysis chemically treated and then subjected
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chiral esters. These reactions gave A: General, 2024, 677, 5 May, 119696; to pyrolysis at 800 C. Pd-In/MOF is
o
th
7-fold to 77-fold enhanced catalysis DOI: 10.1016/j.apcata.2024.119696). the catalyst. (ACS Catalysis, 2024;
effi ciency compared with their batch DOI: 10.1021/acscatal.4c00310).
reactions; 99% ee is reported with long- Direct conversion of propane
term operational stability for 240 hours. (P) to acrylic acid (AA) Production of H and solid
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(Nature Catalysis, 2024, 7, 295-306). [The commercial process consists of carbon by CH decomposition
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two steps where in the fi rst step P goes [Many attempts are being made to make
to avoid leaching of Co. It seems Co CO hydrogenation to formate to acrolein and in the next step it gets H from CH without production of CO
2
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nanoparticles stabilised by N showed converted to AA. There are obvious ad- with co-product solid carbon and this
exceptional stability and catalytic per- Z. Wang et al have reported a highly vantages in having a one-stage process.] column has covered this subject.]
formance (CoN @NC). Here catalysts durable edge-rich MoS catalyst which
2
x
were fully characterised. (J. Catalysis, lene and mercury based catalysts, creat- Ionic Covalent Organic allows the reaction of CO + H + H O H. Qu et al have used Cr-doped meso- A pressurised rotary reactor has been
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o
2024, March, 431, 115374; DOI: ing health and environmental problems); going to HCOOH at 200 C with high porous M1 phase MoVTeNbOx as a used for thermochemical decomposition
10.1016/j.cat.2024.115374). Frameworks (ICOF) in ad- catalyst to realise the title objective. of CH using Fe catalyst. The deposited
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CH selective oxidation. (J. Catalysis, sorption and catalysis The method of preparing the catalyst is carbon was formed as carbon nanofi bers
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n-Butane (B) oxidation to 2024, 24Feb, 115392; DOI: 10.1016/j. given in the paper. With V:Cr = 1:0.015, and carbon nano-onions. The exhaust
maleic anhydride (MAN) cat.2024.115392). M. Liu et al have referred to COFs the selectivity and yield to AA varied gas has unreacted CH , CO and CO . H
2
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having stable frameworks, high sur- from 67.5% to 84.3% and from 26.4% was purifi ed via membrane-based sepa- 2
This was an important development as Additive-free N-methylation face areas, controllable pore environ- to 43.2%, respectively at 380 C (Cata-
o
it displaced the process based on oxi- reaction synergistically cata- ments, and well-defi ned catalytic site, lysis Surveys from Asia, 2024, 05 Feb.; ration. (Ind. Eng. Chem. Res., 2024;
dation of benzene where two carbon lysed by Pt single atoms and and offering a number of opportunities. DOI: 10.1007/s10563-024-09422-5). DOI: 10.1021/acs.iecr.3c03696).
atoms go to CO , resulting in exothermi- ICOFs are a unique class of crystalline Combining best properties
2
city of 94 kcal per mole of CO . B. clusters on α-MoC using porous materials, with charges in the Selective hydrogenation of of homogeneous and hetero-
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Hashim et al have studied the reaction methanol as a sustainable frameworks or along the pore walls, alkynes to alkenes geneous catalysis in hybrid
mechanism and kinetics over VPO C1 source they offer different properties. Prog- 99% selectivity. (Angew. Chem. Intl. [The selective hydrogenation of acety-
catalyst. This catalyst is complex and ress based on ion extraction and energy Ed.; DOI: 10.1002/anie.202307086). lene, HC CH, to ethylene at a level up Pd/N-heterocyclic carbene
is found in approximately 15 different S. Fan et al have worked on the title modifi cation methods is discussed. to 2% in ethylene, without touching ligands
phases. There are multiple-steps in the reactions in aqueous methanol solution, (Angew. Chem. Intl. Ed., 2024; DOI: Effi cient synthesis of ethanol C H to C H , is one of the marvels of D. Prima et al have demonstrated the
title process, and these are covered; without using external H or any addi- 10.1002/anie.202404886). and propanediol from glucose catalysis.] 2 6 formation of transient hybrid nanoscale
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2
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DFT was used. (Ind. Eng. Chem. Res., tives. The mechanism is explained and metal species from homogeneous
2024; DOI: 10.1021/acs.iecr.3c04371). DFT calculations were done. An exam- Pickering emulsion droplets J. Ji et al have used noble metal promo- P.O. Burgos et al have used an MOF- molecular precatalysts via in situ NMR
ple is given. (Green Chem., 2024; DOI: ted CuWO catalyst for hydrogenolysis based catalyst to selectively hydro-
Catalysis using gold contain- 10.1039/D4GC00043A). and solid microspheres acting of glucose to EtOH. Ru/CuWO gave genate phenylacetylene, Ph-C CH to studies. These hybrid structures give
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ing materials synergistically for continuous- highest EtOH selectivity. Brønsted acid Ph-CH=CH , without touching Ph- benefi ts of both molecular complexes
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fl ow cascade reactions
and nanoparticles, resulting in enhanc-
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G.J. Hutchings, who has made many Plasma-catalytic one-step ing activity, selectivity, fl exibility, and
valuable contributions in the area of steam reforming of CH to M. Zhang et al have discussed integra- regulation of active species. Elaborate
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gold-based catalysts, has given a very CH OH + H 2 tion of multiple incompatible catalysts studies are reported for the above
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useful account of this subject. It is now [This column has covered papers on the in one continuous-fl ow reaction and behaviour and computational work was
established that gold-based catalysts must selective conversion of CH to CH OH/ this is of paramount signifi cance in also done. (Angew. Chem. Intl. Ed.,
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have nanosize gold particles and there- CH =CH .] pursuit of green chemistry. These au- 2024; DOI: 10.1002/anie.202317468).
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fore the catalyst preparations methods thors have developed a continuous fl ow
are very important. As an active catalyst W. Fang et al have reported that oligo- cascade catalytic system by co-packing Friedel-Crafts (F-C) alkyla-
it could be as cations, clusters and nano- merised [Cu-O-Cu) species are effi cient micrometre-sized Pickering emulsion tion of toluene by methyl
particles. Chemo and enzyme catalysts can in promoting plasma catalytic one-step droplets and solid microspheres in a mercaptan
be effectively combined for oxidation re- steam reforming of CH to CH OH + H . column reactor. Here optimum micro-
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actions. Examples are selective oxidation 6.8% conversion of CH and 73% environments are provided for each A. Bayout et al have reported this
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of CO in the presence of H , HCl + C H CH OH selectivity is reported without incompatible catalyst and enable to interesting title alkylation where zeolite
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CH = CHCl (In China, major part of CO . (Green Chem., 2024; DOI: work synergistically through directional catalysts were used, and the effect of
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vinyl chloride for PVC is based on acety- 10.1039/D4GC00265B). transfer of reaction intermediates. This topology and acidity was studied. Toluene
172 Chemical Weekly July 23, 2024 Chemical Weekly July 23, 2024 173
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