Nanolayered manganese–calcium oxide as an efficient catalyst toward organic sulfide oxidation

Abstract

We for the first time report that nanolayered Mn–Ca oxide in the presence of H2O2 is an efficient catalyst toward sulfide oxidation to sulfoxide.

Effect of K+ and Ca2+ Cations on Structural Manganese(IV) Oxide for the Aerobic Oxidation of 5-Hydroxymethylfurfural to 2,5-Furandicarboxylic Acid

“…The formation of Ca–MnO 2 catalyst was prepared by a developed method by varying the molar ratio of Ca 2+ /Mn 2+ /Mn 7+ , as shown in Table S1 . The K–MnO 2 catalyst was similar to the synthetic procedure without CaCl 2 .…”

“…The oxidative catalytic methods have been extensively studied in various process of noble metals [gold (Au), , palladium (Pd), platinum (Pt), rhodium (Rh), and ruthenium (Ru) and non-noble metals [cerium (Ce), cobalt (Co), iron (Fe), and manganese (Mn) − ] supported heterogeneous catalysts. Moreover, the nonbase oxidation of HMF was studied over the Co–Mn–Br catalysts to produce high yield of FDCA. − Interestingly, a promising nonprecious manganese oxide (MnO 2 ) could act as an effective heterogeneous catalysts for the aerobic oxidation of HMF to FDCA in which the catalytic performance was determined by the oxygen vacancy formation. , Recently, calcium manganese oxide has been taken as an inspiration to achieve the goals of biomimetic oxygen-evolving catalysts and organic sulfide oxidation. − Although the calcium manganese oxides have been used to support of Pd nanoparticles (PdNPs) in HMF oxidation, their catalytic properties of bare support materials remain a challenge in this field to reveal the synergistic interactions . In this report, the crucial roles of the intercalation of calcium ion to the MnO 2 framework structures will be highlighted and considered for the capability, ability, and stability in the production of FDCA .…”

Applications of the “nano to bulk” Mn oxides: Mn oxide as a Swiss army knife

“…However, development of efficient energy conversion and storage will be essential to efficiently use the solar energy in practice [80,81]. H 2 production by water splitting is a promising route for the conversion of sustainable, but intermittent energies (Fig.…”

“…The nanolayered Mn oxides are efficient catalysts toward organic sulfide oxidation to sulfoxide in the presence of H 2 O 2 [80]. Diverse sulfides were used in the oxidation reactions utilizing layered Mn oxides as catalysts and H 2 O 2 as the oxidant.…”

Nano-sized Mn oxides as true catalysts for alcohol oxidation by a mononuclear manganese(ii) complex

“…Thus, at least a few seconds after mixing Oxone and the complex, one of the true catalysts for alcohol oxidation is nano-sized Mn oxides (Scheme 2). Interestingly, alcohol-oxidation reactions with typical active Mn oxides 20 in the absence of organic ligand compounds show higher activities but lower selectivity (Table 1). We propose that the ligand around Mn oxide particles has an important effect on formation of Mn oxides not only from a morphological view but also activity and selectivity towards alcohol oxidation.…”