Page 169 - CW E-Magazine (9-1-2024)

Special Report

be tolerated. The catalyst is recyclable. Solvent polarity and framework Conversion of CO into solid
DFT calculations were done. (ACS hydrophobicity of Hf-BEA zeo- carbon materials 2
Sustainable Chem. Eng., 2023; DOI: lites influence aldol addition
10.1021/acssuschemeng.2c07353). rates in organic media X. Cheng et al have reviewed this sub-
ject of recent interest via electrochemi-
Pd/C catalytic cyclopropana- A.A. Khechfe et al have studied the cal catalytic systems. The effects of
tion of polycyclic olefins for self-aldol addition of ethyl pyruvate electrolytes and electrode materials on
synthesis of high-energy-den- (EP), a model biomass-derived com- the conversion efficiency and the struc-
sity strained fuels pound, over hydrophobic and hydrophi- ture of carbon materials are discussed.
lic Hf-BEA zeolites in both toluene and (Catalysis Sci. Technol., 2023; DOI:
W. Wang et al have referred to the cata- 10.1039/D3CY00332A).
lytic cyclopropanation of olefins with
diazomethane, but here the majority of A comparative study of the cata-
catalysts employed are homogeneous lytic nitration of toluene over
which are non-cyclable. These authors bimetallic Ce-Mn modified Hβ
have come out with heterogeneous Pd/C zeolite
catalyst. The model substrate taken was [A number of attempts have been made
dicyclopentadiene (DCPD), which was to increase the yield of the para product,
cyclopropanated with high yield; a series which is in greater demand.]
of polycyclic olefins were also studied.
The substances produced in the above R. Deng et al have made the title
way had good fuel characteristics and catalyst adopting ultrasonic assisted
combustion performance. This has an impregnation method. The catalyst
industrial importance. (AIChE Jl, 2023; shows excellent catalytic activity and
DOI: 10.1002/aic.18085). reusability, giving high para selectivity.
68.7% selectivity to para-nitrotoluene
Supported Ag and Cu catalysts was realised at 88.6% conversion,
in the oxidative dehydrogena- in the presence of acetic anhydride.
tion of CH OH to HCHO An explanation for higher selec-
3 tivity has been attempted. (Can. J.
F. Eichner et al have made a comparative Chem. Eng., 2023; DOI: 10.1002/cjce.
study of the title catalysts under indus- 25007).
trially relevant conditions. Ag/SiO , Ag/
2
TiO , Ag/ZrO , Cu/SiO , Cu/TiO and acetonitrile solvents. At 90 C, the high- Direct synthesis of acetone (A)
o
2
2
2
2
Cu/ZrO catalysts were prepared and est rates were observed over hydropho- by aerobic propane oxidation
2
characterised. Ag wt. fraction was up bic Hf-BEA-F in toluene and lowest in [A number of attempts have been made
to 3.86% and that of Cu at 7.96%. The hydrophilic Hf-BEA-OH in acetonitrile. to convert propane to n-/iso-propanol
SiO supported catalysts revealed the (ACS Catalysis, 2023, 13, 6474-6485; in the past.]
2
best performance. DOI: 10.1021/acscatal.3c00787).
A. Rogolino et al have worked on
the extremely challenging C-H acti-
vation in short-chain hydrocarbons
like propane. FeCl salt in acetonitrile
3
photocatalyses the aerobic oxidation
of propane to acetone at room tem-
perature and visible-light irradiation.
100% conversion of propane was rea-
lised with 67% selectivity to acetone.
The mechanism is explained. (ACS
Catal., 2023; DOI: 10.1021/acscatal.
3c02092).

Chemical Weekly January 9, 2024 169

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