Page 178 - CW E-Magazine (28-11-2023)

Special Report Special Report

vity of 39% compared with Pd/HBeta zeolite gave high diastereoselectivity These authors have worked on the Water-assisted sonochemical-
of just 16%. (Catalysis Sci. Technol., of the desired L-menthol. Trickle Bed aniline condensation method where NH ly-induced demethylation of
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2023; DOI: 10.1039/D2CY01783K). Reactor has also been studied. However, is formed and is an exothermic reaction. benzyl alcohol to phenol over
severe catalyst deactivation is reported. Zeolite has many advantages with a structurally stable cupric
Acetoacetate production from (Catalysis Surveys from Asia, 2023, respect to selectivity and easy regenera- oxide catalyst
CO and acetone carboxylase 27, 2-19). tion and DPA selectivity was 95%.
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from photosynthetic bacteria (Catalytic Communications, 2023, 175, T. Bahry et al have come out with this
Rhodobacter Capsulatus (RC) Effi cient epoxidation of sty- Feb., 106624; DOI:10.1016/j.cat- novel title conversion (which on face
rene within Pickering Emul- com.2023.106624). looks not possible!) This reaction is
Y. Kita and Y. Amao have demonstra- sion (PE)-based compartmen-
ted the title process using acetone and talised microreactors Oxalic acid (OA) hydrogena-
NaHCO ; the RC strain was SB1003. tion to glycolic acid (GA)
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Even CO could be used; steady state Z. Zhang et al have used MnO nano-
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Current developments in production is reported. (Catalysis catalysts, which result in numerous E. Schuler et al have worked on the title
CO hydrogenation towards the title catalysts are referred. Cu/zeo- Surveys from Asia, 2023, 27, 67-74; compartmentalised droplet microreac- conversion and have screened hetero-
tors. tert-Butylhydroperoxide was used
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methanol lites have emerged as promising cata- DOI:10.1007/s10563-022-09370-x). geneous catalysts (as is known China has
[This subject has received a lot of atten- lysts and the zeolite topology and activa- several plants to convert OA to ethylene
glycol). This brings out interest in GA:
tion in the recent past due to renewable tion temperature are discussed. Different Process simulation for en- As of now, multiple steps are required
energy based H and economics has type of zeolites were studied. Cu species hanced p-xylene (PX) produc- for the title conversion, but these authors
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been analysed.] in zeolite framework involving 8 and tion via aromatics complex realised in water at room temperature
10- membered rings gave better CH OH integrated toluene (T) methy- have come out with the direct conver- using a combination of catalyst and
P. Schwiderowski et al have reviewed production. (J. Chem. Technol. Biotech- lation with low cost metha- sion of OA in a two-step approach. Ru is ultrasound. DFT computations were
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this subject with respect to industrial nol.; 2023; DOI: 10.1002/jctb.7342). the most active catalyst and formation also done. It seems benzaldehyde is
application. It seems the most promis- nol (M) of acetic acid and ethylene glycol is cur- the intermediate. (Catalysis Sci. Technol.,
ing catalyst is Cu/ZnO/Al O and this Tuning the selectivity of [PX is the key raw material for PTA, tailed; addition of tin helped in improving 2023; DOI: 10.1039/D3CY00100H).
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subject has been elaborated. There is benzene hydroalkylation over required for polyesters of all types.] selectivity and maintaining high activity.
emphasis on catalyst lifetime and deacti- (Green Chem., 2023; DOI: 10.1039/D2G- Hydroaminomethylation of
vation, as well as catalyst poisoning, PdZn/HBeta catalyst D. Wang et al have worked on maxi- for epoxidation. Here 90% selectivity to C02411J). 1-decene
and their relevance is due to impurity- [This column has covered papers on the mising PX production via selective styrene oxide was realised. (Catalysis
containing exhaust gases. Modifi ed selective hydrogenation of benzene to methylation of T with M. The advan- Today, 2023, 410, 15 Feb, 222-230; Anti-Markovnikov (M) hydro- W. Kortuz et al have worked on the
Cu/ZnO system is covered. (Current cyclohexene as well as combo-process tages of the integrated process have DOI:10.1016/j.cattod.2022.08.021). chlorination and hydronitro- conversion of alkenes into amine via
Opinion in Green and Sustainable of making fallow-on cyclohexylbenzene been brought out. A detailed simu- oxylation of alpha-olefi ns using the title reaction. Mechanistic kinetic
Chemistry, 2022, 38, 100688; DOI: (CHB), which can be oxidised and lation was carried out. (Chem. Eng. NH F modifi ed beta-zeolite visible-light photocatalysis modelling was done for this Rh-cata-
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10.1016/j.cogsc.2022.100688). cleaved to give cyclohexanone + phenol.] Res. Des., 2023, 191, March, 184-195; for aniline (A) condensation to
DOI:10.1016/j. cherd.2023.01.003). diphenylamine (DPA) and its J. Kim et al have worked on the title lysed tandem hydroaminomethylation
Selective oxidation of metha- J. Feng et al have reported the title one- catalytic mechanism process where the norm for HCl addi- of 1-decene in a thermomorphic sol-
nol (M) to green oxygenates step process, which involved precisely One-post synthesis of menthol tion to alpha-olefi n is M and hence Cl vent system. (Catalytic Communi-
regulating the density and diffusion of from citral and citronellal Y. Liao et al have worked on the title cations, 2023, 177, April, 106633;
J.P. Walter have made a feasibility study process of commercial importance. comes in the alpha position and not the DOI:10.1016/j.catcom.2023.106633).
of fi xed-bed and membrane reactors P. Maki-Arvela et al have reviewed this The main factors that infl uence the terminal position (normally such com-
for converting M to dimethoxymethane subject using heterogeneous catalysts. solid acid catalysed liquid-phase pro- pounds are made via reaction of HCl Quantifying the contribu-
and methyl formate on a VO and TiO Both batch and continuous reactors cess are acidity and pore structure. with ROH). tion of hot electrons in photo-
x
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catalyst. The PBMR offers signifi cant have been recently deployed. This Fluorine has a role to play, which can It is interesting that these authors have thermal catalysis: A case study
advantages. (Chemie Ing. Technik, reaction happens to be very complex adjust the acidity and pore structure of worked with aqueous HCl and nitric of NH synthesis over C-Ru
2023; DOI: 10.1002/cite.202200202). 3
and a cyclisation of citronellal to iso- beta zeolite, which was modifi ed with acid and unactivated olefi ns. This trans- catalyst
The stepwise conversion of pulegol is required. Further hydrogena- NH F. Various processes are reported formation is enabled by the in situ gene-
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CH to CH OH on Cu and Fe/ intermediate cyclohexene (CHE) via tion gives menthols. In the case of batch for DPA: aniline-aniline hydrochloride ration of photoredox-active ion pairs, X. Bian et al have referred to photother-
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zeolites prepared in solid state lattice contraction and electron-rich reactor very high menthol yields have condensation; aniline-phenol conden- derived from acridine and the mineral mal catalysis as one of the most promi-
surface of Pd via doping of low electro- been reported, using noble and transi- sation; aniline condensation; cyclohexy- acid, as a combined charge- and phase sing green catalytic technologies. Dis-
The direct conversion of CH to CH OH negative M (M = Zn, Ni, Co, or Cu). tion metal supported bifunctional cata- lamine method; cyclohexanone method; transfer catalyst. (Nature Catalysis, tinguishing the effects of hot electrons
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continues to attract a lot of attention and Thus, Pd M/HBeta gave CHB selecti- lysts. Ni-supported on Zr-modifi ed beta phenylhydroxylamine method, etc. 2023, 6, 196-203). and local heating remains challenging.
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178 Chemical Weekly November 28, 2023 Chemical Weekly November 28, 2023 179

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