Topic
MCM-41
About: MCM-41 is a research topic. Over the lifetime, 2355 publications have been published within this topic receiving 91416 citations.
Papers published on a yearly basis
Papers
More filters
••
TL;DR: The particle size and size distribution of the Mg/CeM (Si/CE = 10) nanocatalyst demonstrated the highest conversion of 94.3% at the end of seventh cycle which demonstrated its significant stability.
29 citations
••
TL;DR: In this article, high quality silica MCM-41 has been synthesized in as little as 5 min using cetyltrimethylammonium bromide (CTMABr) as a template under basic conditions with the aid of ultrasonic irradiation.
Abstract: High quality silica MCM-41 has been synthesized in as little as 5 min using cetyltrimethylammonium bromide (CTMABr) as a template under basic conditions with the aid of ultrasonic irradiation.
29 citations
••
TL;DR: In this paper, the mesoporous aluminosilicate Al-MCM-41 with Si/Al=33, 52, 75, and 114 was synthesized using cetyltrimethylammonium bromide (CTAB) as the structuring agent.
Abstract: Mesoporous aluminosilicate Al-MCM-41 with Si/Al=33, 52, 75, and 114 were synthesized using cetyltrimethylammonium bromide (CTAB) as the structuring agent. The materials were characterized using several techniques. The mesoporous structure was confirmed by X-ray diffraction (XRD) technique. The surface area, pore size and pore volume were given by BET equation and BJH method using nitrogen sorption technique. Fourier transform-infrared (FT-IR) spectroscopy was used in order to obtain information on incorporated aluminum atoms in the mesoporous structure of Al-MCM-41. Silicon magic angle spin NMR ( 29 Si-MAS NMR) was used to determine the types of silicon present in the mesoporous material. Aluminum magic angle spin NMR ( 27 Al-MAS NMR) was used to determine the octahedral and tetrahedral coordination present in the Al-MCM-41. Thermogravimetric analysis–differential thermogravimetry (TGA–DTG) was used to determine the thermal stability of the materials. The effect of reaction temperature, WHSV and phenol:diethyl carbonate ratios on the selectivity of p -ethyl phenol were studied. The study of time on stream has been carried out to compare the activity of the catalysts and the results are discussed. The Al-MCM-41 (33) exhibited excellent selectivity for p -ethyl phenol obtained on ethylation of phenol using diethylcarbonate as the ethylating agent.
28 citations
••
TL;DR: In this article, the adorption isotherms of MCM-41 molecular sieve and catalysts exhibit two regions in their reversible parts and also two hysteresis loops.
Abstract: The adorption isotherms of MCM-41 molecular sieve and catalysts exhibit two regions in their reversible parts and also two hysteresis loops. The first hysteresis at relative pressure below 0.4 is assigned to the capillary condensation in the mesoporous channels, and it is sensitive to the filling or blockage in the channels. The adsorption isotherms together with XRD results can be used to characterize the dispersion of nickel and molybdenum oxides on MCM-41. MCM-41 supported Ni and Mo catalysts are in general more active than similar NaY supported catalysts, but they are more strongly dependent on the dispersion of metal oxides owing to the unidimensional channel system, of MCM-41.
28 citations
••
TL;DR: In this article, the performance of Ag catalysts supported on nonporous SiO 2, microporous silicalite zeolite and mesoporous MCM-41 and HMS silicates was investigated in comparison to conventional low surface area α-Al 2 O 3 based catalysts.
28 citations