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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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Journal ArticleDOI
TL;DR: In this paper, a series of vanadium oxide supported on Ti-MCM-41 catalysts was synthesized via the incipient impregnation method by varying the vanadia loading from 5 to 10, 15, 20 and 25 wt%.

34 citations

Journal ArticleDOI
TL;DR: In this paper, the catalysts of sulfated zirconia on MCM-41, Al- and Ga-promoted sulfated ZrO2, and GSZ/MCM41 were characterized with various techniques such as XRD, FTIR, N2 adsorption, NH3-TPD, DRIFT, and TPR-MS.

34 citations

Journal ArticleDOI
TL;DR: In this paper, the catalytic etherification of glycerol using calcium-lanthanum oxide supported on MCM-41 as a stable heterogeneous basic catalyst was investigated.
Abstract: The catalytic etherification of glycerol using calcium–lanthanum oxide supported on MCM-41 as a stable heterogeneous basic catalyst was investigated. Stable heterogeneous mesoporous basic catalysts were synthesized by wet impregnation of MCM-41 with calcium nitrate and lanthanum nitrate. The surface and structural properties of the prepared catalysts were when characterized using different techniques. MCM-41 and modified MCM-41 were used in the solventless etherification of glycerol to produce diglycerol as the desired product. The reaction was performed at 250 °C for 8 h, and catalyst activity was evaluated. Catalytic etherification over the 20%Ca1.6La0.6/MCM-41 catalyst resulted in the highest glycerol conversion of 91% at the diglycerol yield of 43%. The distribution of diglycerol isomer in the etherification of glycerol was studied, and the value of the sum of two dimers (ββ′ + αβ = 67%) was found to be higher than that of αα′ dimer (33%) after 8 h of reaction. Thus, the major reaction occurred inside the porous area instead of the external surface area.

34 citations

Journal ArticleDOI
TL;DR: In this paper, an ordered hexagonal mesoporous aluminosilicate matrix (Al-MCM-41) with incorporated ammonium molybdophosphate (AMP) was successfully synthesized by a one-pot synthesis method with natural clay from low-grade potash ores of Qinghai salt lake as the silica and aluminum source.
Abstract: Ordered hexagonal mesoporous aluminosilicate matrix (Al-MCM-41) with incorporated ammonium molybdophosphate (AMP) was successfully synthesized by a one-pot synthesis method with natural clay from low-grade potash ores of Qinghai salt lake as the silica and aluminum source. We introduced a modified “liquid-phase transport” step, which allowed the use of impure natural clay as a starting material to directly produce pure product without sedimentation pretreatment. The resultant product was characterized by X-ray fluorescence (XRF) spectroscopy, FTIR spectroscopy, XRD, TEM, 27Al and 31P magic-angle spinning (MAS) NMR spectroscopy, and N2 adsorption/desorption, which indicated that the AMP was immobilized in the mesoporous structure of Al-MCM-41. The adsorption capacity of the final product for the removal of cesium ions in solution was also investigated. The results suggested that salt lake clay is a promising low-cost precursor for the production of mesoporous aluminosilicate supports through one-pot syntheses, and the final composite material is effective for the adsorption of cesium ions from solutions containing other alkali metal ions.

34 citations

Journal ArticleDOI
TL;DR: A series of Nb and NbCo-containing mesoporous catalysts with variable Nb/Si molar ratios and a highly ordered hexagonal arrangement of the pores have been hydrothermally synthesized from sodium silicate or tetraethylortosilicate as discussed by the authors.
Abstract: A series of Nb- and NbCo-containing mesoporous catalysts with variable Nb/Si molar ratios and a highly ordered hexagonal arrangement of the pores have been hydrothermally synthesized from sodium silicate or tetraethylortosilicate. The prepared materials were characterized by various techniques, such as: X-ray diffraction (XRD), N2 adsorption–desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR). The oxidizing character of the Nb- or NbCo-MCM-41 materials was revealed in the selective oxidation of styrene, benzene and toluene with H2O2 in liquid phase. A kinetic study was realized for oxidation of styrene with Nb-MCM-41 catalysts. All the Nb and NbCo modified mesoporous catalysts were very active in oxidation of styrene with H2O2.

34 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202334
202258
202172
202071
201993
201890