Page 156 - CW E-Magazine (27-5-2025)

Special Report Special Report

Mn-pincer catalyst which retains the mole %) to give diethyl terephthalate conversion of alcohols into alde- ZHSM-5 as the second oligomerisation
high reactivity and is recyclable (5 and ethylene glycol exclusively at 98- hydes or ketones. This method stands catalyst by varying SiO /Al O ratio.
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consecutive recycling was done). Turn- 99% at 160-180°C. FeCl proved to be out for its high yields and that too at Selectivity towards C hydrocarbons
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9+
over number was more than 230,000. a better catalyst. Thus, textile waste can room temperature, and broad sub- was assessed. HZSM – 5 gives more
(Angew. Chem. Intl. Ed., 2025; DOI: be valorised, and cotton waste is also strates can be used. (Synthetic Com- C products with SiO /Al O ratio of
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9+
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10.1002/anie.202423074). recovered; cloth waste can be treated. munications, 2025, 55, Issue 6; DOI: 180. Tandem catalysts are favoured.
(Ind. Chem. Materials, 2025; DOI: 10.1080/00397911.2025.2461114). (Ind. Eng. Chem. Res. 2025; DOI:
Chemical bonds containing 10.1039/D4.IM00081A). 10.1021/acs.iecr.4c 04755).
hydrogen: Choices for Co-conversion of toluene and
hydrogen carriers and Carbon shell-encapsulated methanol Hydrogen and carbon Upcycling of polyethylene (TS-1) catalyst and abundant active
catalysts La-Ni composite catalyst nanofi bre coproduction by terephthalate (PET) to high- Ti-VI species and hydration. The catalyst is
for hydrogenolysis of Y-Wu et al have reported this title CH decomposition over Ni / value aromatics via catalytic bifunctional and has acidic sites. 99.8%
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J. Cashel et al have referred to com- tetrahydrofurfuryl alcohol co-conversion to para-xylene (PX) diatomite catalysts pyrolysis over zeolites selectivity of EG is reported (This TS-1
pounds containing B-H, C-H, N-H, or (THFA) to 1,5-pentanediol and high olefi ns. Modifi ed ZSM-5 with [This column has covered some papers is a modifi ed version of the conventional
O-H bonds with high H content which (PD) precisely controlled deposition of silica on the subject as it gives H without L. Li et al have studied the aromatic TS-1) (Angew. Chem. Intl. Ed. 2025;
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have been studied. Their performance [This column has covered some papers was used and the procedure is reported. CO ; there is a modifi cation to pass product distribution from thermal and DOI: 10.1002/anie.202502003).
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is largely determined by the nature where the wonders of catalysis can be The total selectivity of high olefi ns and CO on this carbon to make CO.] catalytic fast pyrolysis using Py-GC-
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of these bonds, decomposition path- witnessed as with the change of cata- PX was 94% and PX in xylene isomer D. Li et al have worked on reducing the MS/FID. Thermal pyrolysis at 550- A platinum catalyst with
ways, etc. CH OH, cyclohexane, and lysts and operating conditions THFA was at 99.5%; toluene conversion cost of catalysts and new applications 800°C revealed that acetophenone enhanced three-way catalytic
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NH off er valuable properties. How- can go to 1,2-; 1,4- and 1,5-PD.] was maintained at 43%. (ACS Cata- of carbon. Natural diatomite has been increases sharply with rising tempera- activity supported on CeO
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ever, there are many limitations such lysis, 2025, 15, No.5, 4147-4159; DOI: used as a support for Ni catalysts. Ni ture and becomes the dominant pro- modifi ed with Al O for
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as high temperature for dehydrogena- W. Liu et al have used the title catalyst 10.1021/acscatal.4c07812). Phyllosilicates were synthesised on the duct at 800°C. Catalytic pyrolysis with natural gas vehicles
tion, slow kinetics, etc. Modifi cations for the transformation of THFA to PD. surface of diatomite. At 500°C the CH HZSM-5, H-Beta, and HY was studied.
of catalysts are under study and recent The method of preparing the catalyst is Selective C2+ alcohol synthesis conversion was 30%. It is suggested H-Beta yielded the highest benzene and X. Wang et al have referred to Pt sup-
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progress is covered. Innovations are reported. At 180°C and 3MPa a selec- from syngas boosted by MnOx that this can be added to natural rub- naphthalene. HY signifi cantly promo- ported on CeO as a potential three-way
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required for large scale adoption. (Angew. tivity of 95% is reported. The catalyst doped CoFe bimetallic alloy ber as a fi ller and enhance its heat dis- ted the production of acetophenone, catalyst (TWC) used for treatment of
Chem. Intl. Ed., 2025; DOI: 10.1002/ was reused fi ve times. (ACS Sustain- carbide catalysts sipation properties. (ACS Sustainable and mechanism is given. (ACS Sustain- natural gas exhaust vehicle and this can
anie.202423661). able Chem. Eng., 2025; DOI: 10.1021/ [This column has covered many papers Chem. Eng., 2025, DOI: 10.1021/acs- able Chem. Eng., 2025; DOI: 10.1021/ have sintering of CeO under harsh con-
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acssuschemeng.4c10905). on Fischer-Tropsch Process, operated suschemeng.4c09321). acssuschemeng.5c00489). ditions (say >600°C). To overcome this
Depolymerisation of PET with in petrochemical mode, to give olefi ns, problem these authors have developed
ethanol by homogeneous iron Room-temperature aerobic alcohols, etc.] Selective hydrogenation Green and effi cient a series of Pt/Al O -CeO for modify-
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catalyst for chemical recycling oxidation of alcohols into of dimethyl terephthalate hydrogenation of ing support for stability; 20 wt% Al O
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of cloth waste carbonyl compounds using Z. Li et al have reported a series of (DMT) to dimethyl 2-ethylhexenal to improved the sintering resistance. This
VO@GO catalyst Mn-promoted catalysts with regulated 1,4-cyclohexanedicarboxylate 2-ethylhexanol catalyst gave good performance. (Ind.
N.W.B. Awang et al have reported acid-, proximity between Mn and CoFe O . (DMCHDC) Eng. Chem. Res., 2025; DOI: 10.1021/
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base-free depolymerisation of PET S. Raju et al have reported the title A space-time yield of higher alcohols B. Cheng et al have used Ni/TiO cata- acs.iecr.4c04269).
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–1
with ethanol by FeCl , FeBr (1.0-5.0 one-pot synthesis for the specific of 137 mmol·g (Co+Fe) –1 ·h , with sta- DMCHDC is widely used in the syn- lyst in isopropanol and have studied
bility over 300 hours is reported. The
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the kinetics of the title reaction. Among Stable Co-zeolite propane
fraction of C2+ alcohols in total alco- thesis of polyester resins, polyamides, diff erent solvents, isopropanol gave the dehydrogenation catalysts
and plasticisers.
hols is 94 wt%. (ACS Catal., 2025, 15, highest performance. Conversion was [Propane dehydrogenation is now
No.5, 4069-4080; DOI; 10.1021/acs- H. Han et al have carried out the title 100% and the selectivity was 96.9%. practiced on a grand scale reaching
catal.4c.7408). hydrogenation using ZSM-5-25/50/100, Catalyst was reused fi ve times. (Ind. 750,000 tpa and even in India GAIL’s
ZSM-35, MOR, and β-supported Ru Eng. Chem. Res., 2025; DOI: 10.1021/ plant in Usar, Maharashtra, under exe-
Tandem oligomerisation of catalysts. MoR-supported Ru gave acs.iecr.4c03948). cution is 500,000 tpa and the planned
ethylene for production of jet good performance, and the selectivity unit of Petronet LNG is 750,000 tpa.
fuel over FER and MRI zeolites was 95% and conversion 100%. The Ethylene to ethylene glycol Here Pt based catalysts are used.]
catalysts were fully characterised and (EG) in one step
F. Li et al have investigated three zeo- Ru/MoR had higher Ru dispersion Q. Liu et al have referred to Co-based
lites – HFER, HZSM-5, and HBeta – and stronger metal-support interac- H. Tan et al have reported the title catalysis as promising substitutes for
with diff erent pore technologies in the tion. (Can. J. Chem. Eng., 2025; DOI: one-step synthesis using aq.H O for Pt- and Cr-based catalysts. These
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fi rst oligomerisation step and assessed 10.1002/cjce.25625). epoxidation with Titanium silicalite-1 authors have adopted reaction-driven
156 Chemical Weekly May 27, 2025 Chemical Weekly May 27, 2025 157
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