Page 168 - CW E-Magazine (24-9-2024)

Special Report

In situ XAS diagnostics of able Chem. Eng., 2024; DOI: 10.1021/ catalysts (SACs) for methanol carbo-
reductive hydroformylation acssuschemeng.4c01636). nylation as well as for hydroformy-
reaction in segmented fl ow Low-temperature hydroge- lation and even oxidative carbonyla-
under elevated pressure and nation of carboxylic acids to tion. Optimisation of solid supports is
temperature alcohols over heterogeneous important; theoretical calculations are
helpful. (Chem Cat Chem., 2024; DOI:
FeO -modifi ed Ru catalyst 10.1002/cctc.202400543).
M.E.A. Eid et al have worked on the [The direct conversion of RCOOH to
x
title reaction involving homogeneous RCH OH has many advantages over Diphasic selective oxidation of
catalyst based on Rh metal complexes that based on methyl esters.]
2
modifi ed with tertiary amine ligands. cyclohexene with dilute H O
2
2
This allows direct formation of the cor- M. Tamura et al have reported the use of using Phase Transfer Cata-
responding alcohol. The local atomic SiO -supported FeO -modifi ed Ru as an lysts (PTCs)
x
2
and electronic structure of active sites effective and reusable catalyst with high
yields of the corresponding S. Salaria et al have referred to the elec-
alcohols at over 97% at trochemical production of H O rather
2
2
140 C. This catalyst system than the common 2-Ethyl Anthraqui-
o
avoids hydrogenolysis of the none process. The title reaction was
C-C bonds in the alkyl chain conducted with aq. dilute H O , (0.08-
2
2
and C-C bonds in the pro- 0.25 M), containing sulphate salts.
duced alcohol. (Chem Cat Catalyst were tungsten and molybde-
Chem, 2024; DOI: 10.1002/ num salts, combined with ammonium
cctc.202400708). and imidazolium PTCs. A mixture of
under industrial conditions needs to be [CH (n-C H ) N)[H PO ] and [Et NH]
2
17 3
3
4
3
8
understood. Rh K-edge X-ray absorp- [A reference can also be made to [H PO ] gave 95% overall yield of
2
4
tion spectroscopy (XAS) happens to be an article in T. Tomo et al (Chemis- cyclohexene oxide (80%), cyclohexene-
a unique tool to probe Rh coordination. try: A European Jl.; DOI: 10.1002/ 1,2-diol, 15%, using 0.25 M H O
2
2
These authors have demonstrated the chem.201604762), which gives the ex- and 0.5 M K SO in pH5. (Ind. Eng.
4
2
experimental setup and transmission ample of 2-phenylpropionic acid going Chem. Res., 2024; DOI: 10.1021/acs.
cell. The presence of amine species to its alcohol at 97% at 5 MPa H and iecr.4c01988).
2
in the reaction prevents the formation 140°C and the catalyst is recyclable.] Improved transalkylation of
of Rh clusters in favour of Rh dimers. Advantages of direct dimethyl C10 aromatics with 2-methyl-
(Ind. Eng. Chem. Res., 2024; DOI: ether (DME) from CO and naphthalene (MN) for 2,6-
2
10.1021/acs.iecr.4c01487). H rather than the equivalent dimethylnaphthalene (DMN)
2
Ni-NHC nanoparticles in methanol production synthesis
micelles as an effective and F. Hilfi nger et al have reported that the [2,6-DMN is required to make the cor-
reusable catalyst for hydroge- synthesis of DME is thermodynamically responding dicarboxylic acid, required
nations and reductive-amina- more favourable from the indirect route for PEN.]
tions in water over methanol. Systematic calculations J. Li et al have used Pd-modifi ed zeolites
were done for thermodynamics. The cata- with different framework structures, Pd-
M.G. Avello et al have come out with lyst is Cu/ZnO/ZrO . The direct process HMCM-22, Pd-HBeta, Pd-HMOR, and
2
an interesting strategy where Ni metal- of making DME is superior over sole Pd-HZSM in H atmosphere. 0.1 wt%
2
lomicelles were formed through the methanol synthesis. (Chemie Ing. Technik, Pd-HBeta with 12-ring large pores, with
self-assembly of NHC-olefi n-coordi- 2024; DOI: 10.1002/cite.202300186). stronger Bronsted acid sites, a high Lewis
nated Ni nanoparticles and sodium do- Carbonylation reactions using acid density and a higher Pd dispersion
decyl sulphate as a surfactant in water. single-atom catalysts gave a higher 2-MN conversion. DMN
Reductive-aminations of aldehydes with selectivity, 2-Mn conversion of over
primary amines can be done. Hydro- L. Jurado et al have reviewed this sub- 81% and 2,6-DMN yield of over 9.8%
genations of alkenes, alkynes, and ject covering recent advances in tai- is reported. (Ind. Eng. Chem. Res., 2024;
nitroarenes can be done. (ACS Sustain- loring solid supports for single-atom DOI: 10.1021/acs.iecr.4c01976).
168 Chemical Weekly September 24, 2024
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