A Facile Synthesis of ZrOx-MnCO3/Graphene Oxide (GRO) Nanocomposites for the Oxidation of Alcohols using Molecular Oxygen under Base Free Conditions

Abstract

Graphene and its nanocomposites are showing excellent potential in improving the catalytic performances of different materials. However, the synthetic protocol and its form, such as graphene oxide (GRO) or highly reduced graphene oxide (HRG), influence the catalytic efficiencies. Here, we present, a facile synthesis of graphene oxide (GRO) and ZrOx-MnCO3-based nanocomposites [(1%)ZrOx–MnCO3/(x%)GRO] and their outcome as an oxidation catalyst for alcohol oxidation under mild conditions using O2 as a clean oxidant. The ZrOx–MnCO3/GRO catalyst prepared by incorporating GRO to pre-calcined ZrOx-MnCO3 using ball milling showed remarkable enhancement in the catalytic activities as compared to pristine ZrOx–MnCO3, ZrOx–MnCO3 supported on HRG or ZrOx–MnCO3/GRO prepared by in-situ growth of ZrOx–MnCO3 onto GRO followed by calcination. The catalyst with composition (1%)ZrOx–MnCO3/(1%)GRO exhibited superior specific activity (57.1 mmol/g·h) with complete conversion and >99% selectivity of the product within a short period of time (7 min) and at a relatively lower temperature (100 °C). The catalyst could be recycled at least five times with a negligible decrease in efficiency and selectivity. The catalytic study was extended to different aromatic as well as aliphatic alcohols under optimized conditions, which confirmed the efficiency and selectivity of the catalyst.

Selective Catalytic Oxidation of Toluene to Benzaldehyde: Effect of Aging Time and Calcination Temperature Using CuxZnyO Mixed Metal Oxide Nanoparticles

“…On the other hand, copper-based catalysts have also been broadly employed for several conversions, such as CO oxidation [23], benzene oxidation [24], and the hydroxylation of benzene [25]. In order to replace the noble metals, cheaper alternatives are being probe ing these noble metals with cheaper transition metals for a variety of chemic [11][12][13][14]. One such transition metal is Zn, and zinc-based catalysts have been w for various conversions such as decomposition of nitrous oxide [15], oxidati [16], hydrocarbon oxidation [17], dye degradation [18], and preparation of a 22].…”

“…In order to replace the noble metals, cheaper alternatives are being probed by replacing these noble metals with cheaper transition metals for a variety of chemical reactions [11][12][13][14]. 2…”

Improvement of Thermal Performance of a Solar Box Type Cooker Using SiO2/TiO2 Nanolayer

“…Kumar et al [17] have used samples for an average nanoparticle that size of 50 nm. The turpentine fluid process is the good mass ratios between 5 to 25%, followed by the fluid nanoparticles by Adil et al [18], Ajay Kumar et al [19]. It has been used in a magnetic stirrer, which is miscellaneous in fluid nanoparticles way of the turpentine fluid and disturbed to the particles as followed on 2 hours, then speeds of constant for 1000rpm.…”

Solventless Mechanochemical Fabrication of ZnO–MnCO3/N-Doped Graphene Nanocomposite: Efficacious and Recoverable Catalyst for Selective Aerobic Dehydrogenation of Alcohols under Alkali-Free Conditions

“…Our earlier studies demonstrated the preparation of numerous metal-based nanocatalysts and their graphene nanocomposites and investigated their catalytic performances towards oxidation of alcohols [39][40][41]. In one such study, we demonstrated the promoting effect of zinc oxide NPs in the MnCO 3 , i.e., (1%) ZnO-MnCO 3 nanocatalyst which afforded superb activity for aerial dehydrogenation of alcohols in the presence of O 2 .…”