Page 175 - CW E-Magazine (23-7-2024)

Special Report Special Report

for the catalyst (Pd/CsPMA). Spectro- Effect of H addition on coke
2
scopic techniques were used, and theore- formation and product distri-
tical calculations were done. The mecha- bution in catalytic coupling of
nism of sulphite activation is discussed. CH
4
(ACS Catal., 2024, 14, No. 6, 4352-4361; [A number of papers have appeared on
DOI:10.1021/acscatal.4c00234). the valorisation of CH , particularly to
4
was converted to xylenes with the evo- get C H and this column has covered
2
lution of H S. This reaction was con- A novel process for the oxida- some papers.]
4
2
ducted at 375 C. (ACS Catal., 2024, 14, tive dehydrogenation of eth-
o
No.6, 3867-3877; DOI:10.1021/acs- ane to produce ethylene and This coupling reaction is at 100 C.
o
catal.3c06088). acetic acid Addition of 10% H decreases the CH
2
4
[The concept of oxidative conversion of imidazolium chloride is the IL. Tem- conversion by a factor of 2; aromatic
Sulphite-enhanced aerobic ethane to ethylene and acetic acid has perature of reactor is at 180 C. (Cata- selectivity is signifi cantly reduced.
o
methane oxidation to CH OH been discussed for quite some time and lysis Today, 2024, 434, 15 May, 114696; 10% H reduces coke deposition. A
3
2
[Attempts to directly convert CH to it seems a 30,000-tpa plant exists in DOI: 10.1016/j.cattod.2024.114696). part of H generated in the process is
4
2
CH OH continue to attract attention and Saudi Arabia.] Water-tolerant superbase recycled. (Ind. Eng. Chem. Res., 2024;
3
this column has covered some papers.] polyoxometalate [H (Nb O )] DOI: 10.1021/acs.iecr.4c00381).
-
R. Bermeja et al, Linde Engineering, 2 6 19 6
S. Wang et al have reported that H -re- have come out with the title process to for homogeneous catalysis Upgrading of aqueous ethanol
2
duced phosphomolybdate (PMA) gives give polymer-grade ethylene and gla- S. Kikkawa et al have reported Lind- (EtOH) to long-chain alcohols
promising title reaction at room tempera- cial quality acetic acid. This strategy qvist-type NB oxide cluster, which is a over immobilised highly dis-
ture. Sulphite anions act as a promoter to has many advantages, e.g., integrating superbase and catalyses Knoevenagel persed Ni-Re catalyst
with production of vinyl acetate (VAM)
and ethylene vinyl alcohol (EVOH) An integrative chemical recyc- have come out with layered organic- [A number of papers have appeared in
products. Ethylene requirements by ling approach for catalytic inorganic catalysts by the reaction of the past for direct conversion of EtOH
2028 may reach 230-mtpa. This cata- oxidation of epoxy resin and phosphotungstic acid and a Gemini to e.g., n-butanol.]
lytic process has lower CO emissions. in situ separation of degraded quaternary ammonium salt. This cat-
2
The proprietary catalyst operates for products alyst gave a selectivity of 85% in the Q. Zhang et al have reported the Re
more than 2 years and can be regene- absence of organic solvents. (Ind. Eng. doped Ni@C catalyst, made by a facile
rated. Multi-tubular reactor is proposed L. Liu et al have worked on the title Chem. Res., 2024; DOI: 10.1021/acs. sol-gel method. The bimetal 70-Ni-
with molten salt cooling. (Hydrocarbon problem as we can anticipate prob- iecr.4c00120). Re@C gave higher selectivity towards
Processing, 2024, March.) lems associated with the used blades long-chain alcohols. EtOH conver-
and crossed aldol condensation reac- of windmills. The oxidative degrada- Macrostructural design ap- sion was about 60% and 45% long-
Development of ionic liquids tions (pKa>26). This superbase is water tion depends on Fe/V=O radicals with proach of the monolithic chain alcohols were formed. (Ind. Eng.
(ILs) promoted low content tolerant. (Angew. Chem. Intl. Ed., 2024; strong oxidising properties. The de- catalyst and its application in Chem. Res., 2024; DOI: 10.1021/acs.
Ru catalysts for acetylene DOI: 10.1002/anie.202401526). graded products with different carboxyl nitrobenzene (NB) hydroge- iecr.4c00488).
hydrochlorination Transforming ethyl chloroace- content can be effortlessly separated nation Optimisation of greener and
[Vinyl chloride based on CH CH + HCl tate (ECA) production – lever- into liquid and solid phase. The high more effi cient 1,7-octadiene
is a classic process widely practiced in aging Reactive Chromato- value application of degraded products H. Wang et al have referred to the re- (OD) epoxidation catalysed by
China (one plant in India and forth- graphy with Amberlyst-15 is referred. (Angew. Chem. Intl. Ed., duced pressure drop and improved cata-
lyst utilisation effi ciency in monolithic polymer-supported Mo (VI)
coming unit in Kutch). It has a problem 2024; DOI: 10.1002/anie.202405912).
associated with mercury-based catalysts, ECA is an important intermediate and catalyst. The trends in additive manu- complex
which is hazardous, and an alternative C. Gupta and S.M. Mahjani have come Design of organic-inorganic facturing technology allows innovative
based on gold has been developed.] out with the title strategy where the re- phase transfer hybrid cata- three-dimensional structural monolithic M.M.R. Bhuiyan and B. Saha have re-
action and separation are combined in a lyst and its application in the catalysts. The idea is also to eliminate ported the title reaction (OD comes from
H. Wang et al have prepared nitro- continuous way. The problems of equili- epoxidation of α-olefi ns internal diffusion. A carbon-based selective dimerisation of butadiene) us-
gen-containing ILs modifi ed Ru-based brium-based conversion is avoided. monolithic catalyst was developed for ing a heterogeneous polybenzimidazole
catalysts for the title reaction; Ru con- Modelling was done and this can be a H. Ju et al have worked on long chain the title reaction. The above catalyst supported Mo (VI) catalyst and tert-
tent reduced to 0.3%. This catalyst exhi- basis for designing a SMBR. (Ind. Eng. α-olefi ns where the traditional homo- worked for NB hydrogenation. (Ind. butyl hydroperoxide (TBHP) as an oxi-
bited high catalytic activity and stabi- Chem. Res., 2024; DOI: 10.1021/acs.ie- geneous or heterogeneous catalysts Eng. Chem. Res., 2024; DOI: 10.1021/acs. dising source. The catalyst was fully
lity. 1,3-bis (2,6-diisopropylphenyl) cr.4c00247). show poor performance. These authors iecr.4c00466). characterised, and optimisation was

174 Chemical Weekly July 23, 2024 Chemical Weekly July 23, 2024 175

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