Premium
An organic‐inorganic heterogeneous catalyst based on Keplerate polyoxometalates for oxidation of dibenzothiophene derivatives with Hydrogen peroxide
Author(s) -
FareghiAlamdari Reza,
Zekri Negar,
Moghadam Ahmad Jamali,
Hafshajani Khadijeh Tavakoli,
Farsani Mostafa Riahi
Publication year - 2018
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.4275
Subject(s) - dibenzothiophene , chemistry , benzothiophene , catalysis , hydrogen peroxide , thiophene , flue gas desulfurization , ionic liquid , inorganic chemistry , sulfur , yield (engineering) , bromide , quinoline , nuclear chemistry , organic chemistry , materials science , metallurgy
An organic‐inorganic material (NH 4 ) 2 (MimAM) 40 [Mo 132 O 372 (CH 3 COO) 30 (H 2 O) 72 ] have been synthesized by reacting [(NH 4 ) 42 [Mo VI 72 Mo V 60 O 372 (CH 3 COO) 30 (H 2 O) 72 ] with the ionic liquid 3‐Aminoethyl‐1‐methylimidazolium bromide. The catalyst showed remarkably a high catalytic performance in the oxidation of dibenzothiophene (DBT) derivatives with H 2 O 2 35% as a safe and green oxidant. The main parameters affecting the process including catalyst, acid additive, hydrogen peroxide amounts and temperature have been investigated in detail. Sulfur removal of DBT in n‐heptane reached to 98.3% yield at 40 °C using 2.5 mmol H 2 O 2 and 100 mg of (NH 4 ) 2 (MimAM) 40 [Mo 132 O 372 (CH 3 COO) 30 (H 2 O) 72 ] after 90 min. Under the optimal conditions, BT (benzothiophene), DBT (dibenzothiophene) and 4,6‐DMDBT (4,6‐dimethyl‐dibenzothiophene) achieved high desulfurization efficiency. Our results showed that the reactivity order of different model sulfur compounds are thiophene <4,6‐dimethyl dibenzothiophene< dibenzothiophene. The catalysts could be easily separated from the reaction solution by simple filtration and recycled for several times without loss of activity.