Synthesis, characterization and catalytic application of MCM-41 mesoporous molecular sieves containing Zn and Al

Selvaraj, Manickam; Pandurangan, A.; Seshadri, K.; Sinha, Pradeep K.; Lal, Krishan

doi:10.1016/s0926-860x(02)00527-6

Cited by 104 publications

(53 citation statements)

References 18 publications

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“…The Al-containing MCM-41 (Al-MCM-41) is one of the most studied MCM-41. Al-MCM-41 is formed by a hexagonal arrangement of parallel tubes with an ordered pore system of adjustable size in the range from 1.5 to >10 nm and a high surface area (≈ 1100 m 2 g -1 ) [Selvarej, 2003]. A very striking feature of this solid is the wide variety of synthetic methods used for its preparation, with a wide range of framework Si/Al ratios and the possibility of introducing various metals in the structural network, either by isomorphic substitution or post-synthesis impregnation [Corma, 1997].…”

Section: Introductionmentioning

confidence: 99%

VAPOR-PHASE CATALYTIC CONVERSION OF ETHANOL INTO 1,3-BUTADIENE ON Cr-Ba/MCM-41 CATALYSTS

La-Salvia

Lovón-Quintana

Valença

2015

Braz. J. Chem. Eng.

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-Al-MCM-41, 16%Ba/Al-MCM-41 and 1.4%Cr-16%Ba/Al-MCM-41 were used as catalysts in the vapor-phase catalytic conversion of ethanol. Physical-chemical properties of the catalysts and the effect of barium and chromium on the Al-MCM-41 activity and 1,3-butadiene yield were studied. The catalysts were characterized by X-ray diffraction (XRD), N 2 physisorption (BET method), CO 2 chemisorption and Fourier transform infrared spectroscopy (FT-IR). When ethanol was completely converted on Al-MCM-41 and 16%Ba/Al-MCM-41, the reaction products showed a high selectivity for ethylene (90-98%). However, on the 1.4%Cr-16%Ba/Al-MCM-41 catalyst, a greater number of reaction products were obtained such as ethylene, acetaldehyde, diethyl ether and 1,3-butadiene. The maximum 1,3-butadiene yield obtained from ethanol reaction was 25% at 723 K and W/F EtOH = 15 g h mol -1 . The latter result was obtained in a single step and without addition of reaction promoters (e.g., acetaldehyde, crotonaldehyde, hydrogen) in the feed stream to the reactor.

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Section: Introductionmentioning

confidence: 99%

VAPOR-PHASE CATALYTIC CONVERSION OF ETHANOL INTO 1,3-BUTADIENE ON Cr-Ba/MCM-41 CATALYSTS

La-Salvia

Lovón-Quintana

Valença

2015

Braz. J. Chem. Eng.

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“…The broad bands around 3500 cm -1 may be attributed to surface silanols and adsorbed water molecules, while deformational vibrations of adsorbed molecules cause the adsorption bands at 1653 cm -1 . 16) The bands observed at around 1231 and 1088 cm -1 are related to the intratetrahedral asymmetrical stretching. The existence of Si-O-T (T＝H) bonds is indicated by the presence of a vibration at around 966 cm -1 .…”

Section: Characterizationmentioning

confidence: 98%

“…Experimental procedure 2.1 Synthesis of mesoporous silica MCM-41 powder Mesoporous MCM-41 powder was synthesized according to the method described by Mou et al. 15) 0.060 g of sodium aluminate (54 Al 2 O 3 ) was dissolved in 3.0 g of water and mixed with 30.0 g of a 12 C 16 TMABr (cetyltrimethylammonium bromide, 99) aqueous solution. Then 5.3 g of sodium silicate (27 SiO 2 and 14 NaOH) was added to the above solution.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of bulky mesoporous silica Pd-MCM-41

Nagata

Hirao²,

Onoki

et al. 2008

J. Ceram. Soc. Japan

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Bulky palladium catalyst supported on mesoporous silica MCM-41 (Pd-MCM-41) was successfully synthesized by hydrothermal hot-pressing method. In this study, the structure of the palladium species in Pd-MCM-41 bulk before and after heat-treatment process was revealed by X-ray diffraction (XRD), X-ray absorption near edge structure (XANES) and transmission electron microscopy (TEM). Also, the microstructure and mesoporous property of Pd-MCM-41 bulk was discussed. As a result, it was revealed that these dense Pd-MCM-41 bulks possessed a high surface area of over 1000 m 2 /g and the structure of palladium of Pd-MCM-41 bulk is almost equal to palladium (0) metal.

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“…The first weight loss was observed at 50-150 ℃ about 3.1031 % due to desorption of physisorbed water on the external surface of the crystallites or occluded in the macropores and mesopores present between the crystallites aggregates (Selvaraj, et al, 2003;Chu, et al, 2003). Meanwhile, in the range of 150-330 ℃ weight losses about 30.9060% are attributed to the decomposition or removal of organic (Guo, et al, 2001;He, et al, 2000).…”

Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 99%

Functionalization of Mesoporous Si-MCM-41 by Grafting with Trimethylchlorosilane

Taib¹,

Endud²,

Katun³

2011

IJC

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The production of functionalized mesoporous silicas has attracted great attention in the last years. In particular, the uses of organosilanes, as modification agents, has been largely studied due mainly to the increasing requirements deriving from the area of polymer nanocomposites, treatments of heavy metal contaminants, heterogeneous catalysis and also in components of active corrosion protection coatings. In this study, organosilane-modified mesoporous were prepared and investigated by various physico-chemical techniques, including X-ray powder diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), 13 C CP/MAS NMR and Thermalgravimetry (TGA). The organically modified mesoporous derived from the reaction of mesoporous Si-MCM-41 with trimethylchlorosilane have been considered. The results indicated that the surface modification did not modify the original structure of Si-MCM-41 but altered their original hydrophilic nature to hydrophobic. Herein, we demonstrate the possibility of modify and functionalize surface of MCM-41, enabling applications in many fields as nanocomposites, drug releasing agents and components of active coatings.

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Synthesis, characterization and catalytic application of MCM-41 mesoporous molecular sieves containing Zn and Al

Cited by 104 publications

References 18 publications

VAPOR-PHASE CATALYTIC CONVERSION OF ETHANOL INTO 1,3-BUTADIENE ON Cr-Ba/MCM-41 CATALYSTS

VAPOR-PHASE CATALYTIC CONVERSION OF ETHANOL INTO 1,3-BUTADIENE ON Cr-Ba/MCM-41 CATALYSTS

Synthesis and characterization of bulky mesoporous silica Pd-MCM-41

Functionalization of Mesoporous Si-MCM-41 by Grafting with Trimethylchlorosilane

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