Characterization of hydrothermally treated MCM-41 and Ti-MCM-41 molecular sieves

Schacht, P.; Noreña-Franco, Luis E.; Ancheyta, Jorge; Ramírez, Sergio; Hernández-Pérez, I.; Garcı́a, Luis

doi:10.1016/j.cattod.2004.07.057

Cited by 30 publications

(15 citation statements)

References 16 publications

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“…1(a). Although they were prepared differently, they gave similar XRD patterns with four characteristic peaks of (100), (110), (200) and (211) planes that confirmed an ordered structure as in the parent MCM-41 [15]. Thus, incorporating Ti into the structure of RH-MCM-41 by adding TBOT into the synthetic gel and grafting TBOT on the preformed RH-MCM-41 did not cause much change in the MCM-41 structure.…”

Section: Catalyst Characterizationsupporting

confidence: 65%

Characteristics and photocatalytic degradation of methyl orange on Ti-RH-MCM-41 and TiO2/RH-MCM-41

Artkla

Wantala

Srinameb

et al. 2009

Korean J. Chem. Eng.

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Our purpose was to synthesize, characterize and test photodegradation of methyl orange on two catalysts containing 10 wt% titanium supported on mesoporous MCM-41 synthesized with rice husk silica. The first catalyst was Ti-RH-MCM-41 prepared by adding tetrabutyl orthotitanate (TBOT) in a synthetic gel of RH-MCM-41, and the second catalyst was TiO 2 /RH-MCM-41 prepared by grafting TBOT on the preformed RH-MCM-41. The mesoporous structures were observed on both catalysts and they had surface area of 1,073 and 1,006 m 2 /g. The Ti in Ti-RH-MCM-41 was in the form of Ti(IV) with tetrahedral geometry residing in the mesoporous structure. This form was less active for photodegradation of methyl orange than the other one. The Ti in TiO 2 /RH-MCM-41 was anatase titania with octahedral geometry located outside the mesoporous framework. This form was more an active phase for the photodegradation and the reaction parameters on this catalyst were further investigated. The optimum catalyst weight to methyl orange volume ratio was 5 g/L and the optimum initial concentration of the dye was 2.0 ppm. The degradation rate obeyed pseudo-first order and the adsorption of methyl orange on TiO 2 /RH-MCM-41 obeyed Langmuir isotherm.

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Section: Catalyst Characterizationsupporting

confidence: 65%

Characteristics and photocatalytic degradation of methyl orange on Ti-RH-MCM-41 and TiO2/RH-MCM-41

Artkla

Wantala

Srinameb

et al. 2009

Korean J. Chem. Eng.

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“…The very intense band at 1092 cm −1 is attributed to asymmetric groups Si‐O−Si . The band at 803 cm −1 belongs to the Si−O symmetrical stretch ,. The band present at 456 cm −1 is attributed to a blending of Si‐O−Al (Si) groups .…”

Section: Resultsmentioning

confidence: 98%

“…Therefore, the 27 Al MQ MAS NMR spectra of Al 2 O 3 in Ni 2 Si/SiO 2 ‐Al 2 O 3 and Ni/Al 2 O 3 are illustrated in Figure d. In the spectrum of Ni/Al 2 O 3 , the Al 3+ peak maxima at around 52 and −4 ppm correspond to tetrahedral [Al(IV)] and octahedral coordination [Al(VI)], respectively . Moreover, the peak at 28 ppm belongs to unsaturated Al 3+ cations with pentahedral coordination [Al(V)] .…”

Section: Resultsmentioning

confidence: 99%

One‐step Modification of Active Sites and Support in Ni/Al₂O₃ Catalyst for Hydrodeoxygenation of Lignin‐derived Diphenyl Ether

et al. 2018

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A bifunctional Ni2Si/SiO2‐Al2O3 catalyst was prepared by one‐step chemical vapor deposition (CVD), and used for hydrode‐oxygenation (HDO) of diphenyl ether (DPE). During the one‐step CVD process, metallic Ni species as the HDO active sites were isolated by intermetallic modification of Si atoms and partial electron transferred from Ni to Si, as inferred by XRD, XPS, and theoretical calculation. Furthermore, the characterization results revealed that the acidity and structure of Al2O3 were tuned due to the formation of Al‐O−Si bonds. Consequently, compared with Ni/Al2O3 catalyst, the Ni2Si/SiO2‐Al2O3 catalyst showed a higher benzene selectivity (60% vs 47%), O‐free products selectivity at the similar conversion of DPE, and high stability for the HDO of DPE. This work provides insight for design of bifunctional catalysts with specific catalytic properties by one‐step CVD method.

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“…The homogeneous gel was sealed in Teflon-lined stainless steel autoclaves and heated at 423 K under static conditions. The time of crystallization was 48 h. The resulting solid products were recovered by filtration and then doubly washed with deionized water and they were dried at room temperature for 24 h. Finally, the material was calcined at 813 K for 6 h. The formulation was modified according to a procedure previously reported [35][36][37]. The prepared sample was functionalized by keeping it in toluene, adding 3-Mercaptopropyltrimethoxysilane (TMPTS) and stirring for 4 h. The organic phase was separated and dried at room temperature for 12 h. After this procedure the dried sample was added to a solution of methanol and hydrogen peroxide and stirred for 2 h at room temperature.…”

Section: Experimental Synthesismentioning

confidence: 99%

Effect of CoMo/HSO3-functionalized MCM-41 over Heavy Oil

et al. 2019

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The potential of Co-Mo metals supported on functionalized MCM-41 as catalyst to hydrodesulfurization of heavy oil has been explored in this work. The MCM-41 functionalized sample was synthesized according to methods previously reported in the literature. Co and Mo metals were incorporated into the support by simultaneous impregnation. The catalyst was characterized by specific Surface area and X-Ray Diffraction. The pore channel of MCM-41 was confirmedby transmission electronic microscopy and infra red spectroscopy. Catalytic activity tests were carried out using heavy oil from Gulf of Mexico. The API gravity was increased from 12.5 to 20.2, the kinematics viscosity was decreased from 18,700 to 110 cSt at 298 K, the contents of asphaltene and sulfur were also reduced.

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Characterization of hydrothermally treated MCM-41 and Ti-MCM-41 molecular sieves

Cited by 30 publications

References 16 publications

Characteristics and photocatalytic degradation of methyl orange on Ti-RH-MCM-41 and TiO2/RH-MCM-41

Characteristics and photocatalytic degradation of methyl orange on Ti-RH-MCM-41 and TiO2/RH-MCM-41

One‐step Modification of Active Sites and Support in Ni/Al₂O₃ Catalyst for Hydrodeoxygenation of Lignin‐derived Diphenyl Ether

Effect of CoMo/HSO3-functionalized MCM-41 over Heavy Oil

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Characterization of hydrothermally treated MCM-41 and Ti-MCM-41 molecular sieves

Cited by 30 publications

References 16 publications

Characteristics and photocatalytic degradation of methyl orange on Ti-RH-MCM-41 and TiO2/RH-MCM-41

Characteristics and photocatalytic degradation of methyl orange on Ti-RH-MCM-41 and TiO2/RH-MCM-41

One‐step Modification of Active Sites and Support in Ni/Al2O3 Catalyst for Hydrodeoxygenation of Lignin‐derived Diphenyl Ether

Effect of CoMo/HSO3-functionalized MCM-41 over Heavy Oil

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One‐step Modification of Active Sites and Support in Ni/Al₂O₃ Catalyst for Hydrodeoxygenation of Lignin‐derived Diphenyl Ether