Page 168 - CW E-Magazine (12-3-2024)

Special Report

less than 600°C. Many related aspects was done and separation of catalyst and by heavy metals. Further, R has shown
are discussed. (ACS Omega, 2023; DOI: solid product is discussed. High tem- uses as fungicidal, bactericidal and
10.1021/acsomega.3c07274). perature favours formation of CO and antioxidant in pharma formulation. R has
2
low temperature was benefi cial for CH . many other applications. The uses of
Reduction of phosphogypsum Without catalyst, CO was the product R continue to be explored. This review
4
(PG) for SO production; In- of hydrogenation. With the catalyst, covers advancement made in the fi eld of
2
sights into the release character- almost 100% CH selectivity is realised at R chemistry in the past three years. R is
4
istics of SO following solid-solid 250°C and 400°C. Magnetic separation an eco-friendly and low-cost commodity
2
reaction of CaS and CaSO allowed the separation of the solid pro- chemical. (Chemistry Select, 2023, 8,
4
under different atmospheres duct. Catalyst reactivity was stable. (Ind. Issue 42; DOI: 10.1002/slct.2023.02903).
[PG is produced in large quantities in Eng. Chem. Res., 2023; DOI: 10.1021/ H production via CH pyrolysis
phosphoric acid production, as well as acs.iecr.3c0317g). 2 4
gypsum in neutralising excess H SO and [This subject has seen renewed interest
2
4
this column has covered some papers on Recent developments in as H is produced from CH without
4
2
valorisation.] Rongalite (R)chemistry CO generation and carbon black has
2
many uses.]
P. Gao et al have carried out thermo- R. Ali has given a critical review of the
dynamic calculations. Experiments were title subject; R has been known for a very This method of making H from CH is
4
2
performed with different molar ratios of long time and has been used in dyes, referred to as “turquoise” H . It is useful
2
CaS to CaSO , reaction temperature and rubber and veterinary industries. R is to recall the amount of CO that is emitted
2
4
heating rate. High reaction temperatures also used as an antidote for poisoning by different methods: Black H from bitu-
2
favour CaO stability and maximum SO minous coal gasifi cation gives 18-20 kg
2
comes at molar ratio of 1:3. Optimal CO per kg of H ; Brown H from brown
2
2
2
conditions are reported. (Can. J. Chem. coal (lignite) gasifi cation gives 7-14 kg
Eng., 2023; DOI: 10.1002/cjce.25117). CO per kg H ; Grey H from SMR of
2
2
2
natural gas gives 8-12 kg CO per kg
2
Hydrogenation of magnesite H ; Blue H from SMR with CCS gives
2
2
to CH and MgO with a ferro- 0.4-6.5 kg CO per kg H ; Turquoise H
2
2
2
4
magnetic catalyst towards CO gives almost 0-1.1 kg per kg; Green H
2
direct utilisation 2 via electrolysis of water using renewable
energy gives 0 CO per kg H . CH to 2H
2
4
2
2
Y. Shan et al have worked on the title + C requires 91.7 KJ per mole CH at
4
subject with Ni/Fe/ZrO catalyst and 1000°C; it is 37.4 KJ per mole H at stan-
2
2
hydrogenation of magnesite gives CH dard conditions. Heating value is supplied
4
and MgO. Thermodynamic analysis by about 15-25% of available H . (Chem.
2
Eng. Magazine, 2023, November issue).
Two-membrane dual non-aque-
ous/aqueous electrolyte fl ow cell
operation for electrochemical
conversion of CO to methyl
formate 2
M. Gautam et al have conducted the
title reaction in fl ow electrolyser where
the non-aqueous catholyte and cat-
ion exchange membranes were used,
with fl owing methanol catholyte and
aqueous anolyte. Methyl formate was
formed at 43% Faradaic efficiency.
(ChemSusChem, 2023; DOI: 10.1002/
cssc.2023.01337).
168 Chemical Weekly March 12, 2024
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