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MCM-41
About: MCM-41 is a research topic. Over the lifetime, 2355 publications have been published within this topic receiving 91416 citations.
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TL;DR: Sodium and caesium cation-exchanged mesoporous MCM-41 are shown to be mild, selective, water-stable and recyclable catalysts for the base-catalysed Knoevenagel condensation and acid-cated acetalization and aldol condensation as discussed by the authors.
Abstract: Sodium and caesium cation-exchanged mesoporous MCM-41 are shown to be mild, selective, water-stable and recyclable catalysts for the base-catalysed Knoevenagel condensation and acid-catalysed acetalization and aldol condensation, whereas caesium acetate-impregnated MCM-41 shows strong base activity in the Michael addition.
157 citations
TL;DR: In this article, anchored Pd complexes in mesoporous supports such as MCM41 and MCM-48 were reported as true heterogeneous catalysts for hydrocarboxylation of aryl olefins and alcohols.
Abstract: We report here, for the first time, synthesis of anchored Pd complexes in mesoporous supports such as MCM-41 and MCM-48 as true heterogeneous catalysts for hydrocarboxylation of aryl olefins and alcohols to give excellent conversion (∼100%) and regioselectivity (∼99%) for 2-arylpropionic acids. The catalysts were characterized by powder-XRD, 31P CP-MAS NMR, FT-IR, TEM, XPS and ICP-AES. Recycle studies with these anchored Pd mesoporous catalysts were performed to confirm true heterogeneity.
155 citations
TL;DR: In this paper, a new heterogeneous Fenton catalyst, Fe-Cu bimetallic oxides supported aluminum-containing MCM-41, was synthesized by co-precipitation method.
Abstract: A new heterogeneous Fenton catalyst, Fe-Cu bimetallic oxides supported aluminum-containing MCM-41, was synthesized by co-precipitation method. The physicochemical characteristics of the synthesized samples were evaluated by various techniques such as XRD, TEM, nitrogen physisorption, zeta potential and XPS. The incorporation of metal species did not alter the well-ordered hexagonal mesostructure of MCM-41 support. Compared with the monometallic or the Al absent catalysts, this new bimetallic oxides supported aluminum-containing MCM-41 catalyst exhibited a higher activity and stability in phenol mineralization. The effects of temperature, pH and H2O2 dosage were investigated in terms of the TOC conversion. At pH 4, 60 °C and 0.049 mol/L of H2O2 dosage, a 47% TOC reduction has been achieved. With incorporating aluminum, the increase in surface oxygen-containing groups was observed by zeta potential analysis, the downshift binding energy of active metals was found by XPS measurement, and an enhancement of H2O2 utilization ratio was achieved. On the basis of our findings, the beneficial role of Al has been explained.
155 citations
TL;DR: Aluminum-containing mesoporous molecular sieves AISBA-15 with different n(Si)/n(Al), ratios and AIMCM-41 have been synthesized hydrothermally and characterized in detail by physicochemical methods, viz. XRD, N-2 adsorption and Al-27 NMR spectroscopy as discussed by the authors.
155 citations
TL;DR: In this paper, mesoporous MCM-41 materials and transition-metal-free oxides were prepared and tested as heterogeneous catalysts for the direct conversion of trioses to lactates.
153 citations