Multifunctionality of weak ferromagnetic porphyrin-based MOFs: selective adsorption in the liquid and gas phase

Ferromagnetic [Ni₅(H₂TCPP)₂O(H₂O)₄]·nS exhibits selective adsorption towards cationic dyes in solution and gas separation calculations predict promising values for gas mixtures.

Synthesis and Comparative Catalytic Study of Zirconia-MnCO3 or -Mn2O3 for the Oxidation of Benzylic Alcohols

We report on the synthesis of the zirconia-manganese carbonate ZrO_x(x   %)-MnCO₃ catalyst (where x=1-7) that, upon calcination at 500 °C, is converted to zirconia-manganese oxide ZrO_x(x   %)-Mn₂O₃ . We also present a comparative study of the catalytic performance of the both catalysts for the oxidation of benzylic alcohol to corresponding aldehydes by using molecular oxygen as the oxidizing agent. ZrO_x(x   %)-MnCO₃ was prepared through co-precipitation by varying the amounts of Zr(NO₃)₄ (w/w %) in Mn(NO₃)₂. The morphology, composition, and crystallinity of the as-synthesized product and the catalysts prepared upon calcination were studied by using scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and powder X-ray diffraction. The surface areas of the catalysts [133.58 m² g^-1 for ZrO_x(1 %)-MnCO₃ and 17.48 m² g^-1 for ZrO_x(1 %)-Mn₂O₃ ] were determined by using the Brunauer-Emmett-Teller method, and the thermal stability was assessed by using thermal gravimetric analysis. The catalyst with composition ZrO_x(1 %)-MnCO₃ pre-calcined at 300 °C exhibited excellent specific activity (48.00 mmolg^-1 h^-1) with complete conversion within approximately 5 min and catalyst cyclability up to six times without any significant loss in activity. The specific activity, turnover number and turnover frequency achieved is the highest so far (to the best of our knowledge) compared to the previously reported catalysts used for the oxidation of benzyl alcohol. The catalyst showed selectivity for aromatic alcohols over aliphatic alcohols.

Highly thermally stable heterogeneous catalysts: study of 0D and 3D porphyrinic MOFs

Porphyrin-based MOFs as heterogeneous catalysts show high catalytic activity, recyclability and selectivity towards alkene oxidation.

A highly reduced graphene oxide/ZrOx–MnCO3 or –Mn2O3 nanocomposite as an efficient catalyst for selective aerial oxidation of benzylic alcohols

ZrOx(1%)–MnCO₃/HRG(1%) based nanocomposites material as an efficient oxidation catalyst.

Synthesis, Characterization, and Relative Study on the Catalytic Activity of Zinc Oxide Nanoparticles Doped MnCO3, –MnO2, and –Mn2O3 Nanocomposites for Aerial Oxidation of Alcohols

Zinc oxide nanoparticles doped manganese carbonate catalysts [X% ZnOx–MnCO3] (where X = 0–7) were prepared via a facile and straightforward coprecipitation procedure, which upon different calcination treatments yields different manganese oxides, that is, [X% ZnOx–MnO2] and [X% ZnOx–Mn2O3]. A comparative catalytic study was conducted to evaluate the catalytic efficiency between carbonates and oxides for the selective oxidation of secondary alcohols to corresponding ketones using molecular oxygen as a green oxidizing agent without using any additives or bases. The prepared catalysts were characterized by different techniques such as SEM, EDX, XRD, TEM, TGA, BET, and FTIR spectroscopy. The 1% ZnOx–MnCO3 calcined at 300°C exhibited the best catalytic performance and possessed highest surface area, suggesting that the calcination temperature and surface area play a significant role in the alcohol oxidation. The 1% ZnOx–MnCO3 catalyst exhibited superior catalytic performance and selectivity in the aerial oxidation of 1-phenylethanol, where 100% alcohol conversion and more than 99% product selectivity were obtained in only 5 min with superior specific activity (48 mmol·g−1·h−1) and 390.6 turnover frequency (TOF). The specific activity obtained is the highest so far (to the best of our knowledge) compared to the catalysts already reported in the literatures used for the oxidation of 1-phenylethanol. It was found that ZnOx nanoparticles play an essential role in enhancing the catalytic efficiency for the selective oxidation of alcohols. The scope of the oxidation process is extended to different types of alcohols. A variety of primary, benzylic, aliphatic, allylic, and heteroaromatic alcohols were selectively oxidized into their corresponding carbonyls with 100% convertibility without overoxidation to the carboxylic acids under base-free conditions.

Photooxidation of benzyl alcohols and photodegradation of cationic dyes by Fe3O4@sulfur/reduced graphene oxide as catalyst

The degradation efficiency of MB and CV in presence of Fe₃O₄@S/RGO and other catalysts in the dark and under 7 W LED visible light irradiation.

A novel MOF/BiFeO3 composite as a catalyst for efficient and selective oxidation of alcohols

In this work, a novel metal–organic framework based composite with BiFeO₃ noted as MOF/BiFeO₃ has been synthesized and successfully employed as a highly efficient heterogeneous and recoverable catalyst for oxidation of alcohols under mild conditions.