Heteropolyanion-based ionic hybrid solid: A green bulk-type catalyst for hydroxylation of benzene with hydrogen peroxide

Hydroxylation of Benzene to Phenol by H2O2 over an Inorganic–Organic Dual Modified Heteropolyacid

“…The molybdovanadophosphoric heteropolyacid H 4 PMo 11 VO 40 was prepared according to the procedure reported in the literature [13,16]. Briefly, 15.8 g of MoO 3 and 0.91 g of V 2 O 5 were added into 250 ml of deionized water and the resulting suspension was then heated up to the reflux temperature under stirring.…”

“…However, these applied catalysts cannot simultaneously possess a reasonable activity for the conversion of benzene and a high selectivity for phenol, resulting in the rather low yield of phenol. Vanadium containing heteropolyacids (HPAs) have been proven to be effective catalysts for the hydroxylation of benzene to phenol [9][10][11][12][13][14][15][16][17]. Unfortunately, pure HPAs utilized in bulk form, which can be dissolved in a polar reaction medium, have some drawbacks such as difficulty for catalyst separation and recovery.…”

Hybrid Organic-Inorganic Materials Based on Polyoxometalates and Ionic Liquids and Their Application in Catalysis

“…The phenol could be obtained from benzene as well by the hydroxylation of the latter with H 2 O 2 . Some recent studies of Leng et al [66,67] were devoted to this reaction in which they proposed the application of a dicationic (dimethyl diimidazolium) and a polymeric ionic liquid to the PMo 10 V 2 O 5− 40 anion in order to improve the resistance of the hybrid in excess of H 2 O 2 . The satisfactory results in the case of the dicationic ionic liquid lead to the application of the polymeric one for which high efficient heterogeneous performance was observed (100% selectivity with 23% phenol yield) and attributed to the promotion of the redox properties of the POM by the intramolecular charge transfer from the -electron enriched cross-linked polymeric IL framework.…”

Deep Desulfurization of Fuels by Heteropolyanion-Based Ionic Liquid

“…However, the complicated synthesis process of the catalyst is unfavorable to be commercialized. Molybdovanadophosphate heteropoly acid showed high reactivity for esterification 32,33 and oxidation reactions.…”