Single crystals of mesoporous tungstenosilicate W-MCM-48 molecular sieves for the conversion of methylcyclopentane (MCP)

Fechete, Ioana; Donnio, Bertrand; Ersen, Ovidiu; Dintzer, Thierry; Djeddi, Amel; Garin, F.

doi:10.1016/j.apsusc.2010.10.063

Cited by 43 publications

(36 citation statements)

References 47 publications

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“…The lack of hydrothermal stability of the mesoporous materials has been overcome by the incorporation of heteroatoms such as Al, Ga, Ti, Fe, V, W and Cr [4][5][6][7]. These properties allow these mesoporous materials to be used in a wide range of applications such as catalysis [4][5][6][7], adsorption [8,10], extraction [11], energy [12], drug delivery systems [13], and for their luminescent character [14].…”

Section: Introductionmentioning

confidence: 99%

Catalytic behavior of surfactant-containing-MCM-41 mesoporous materials for cycloaddition of 4-nitrophenyl azide

Boukoussa

Zeghada

Ababsa

et al. 2015

Applied Catalysis A: General

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International audienceSi-MCM-41, Ga-MCM-41 and Al-MCM-41 mesoporous catalysts (with Si/Al = 80 and Si/Ga = 80) were prepared by direct synthesis under hydrothermal crystallization method using sodium aluminate or gallium sulfate and tetraethyl orthosilicate (TEOS) as aluminum or gallium and silica sources, respectively. The structural features of the materials were determined by various physico-chemical techniques such as X-ray diffraction (XRD), nitrogen sorption at 77 K, Fourier transform infrared spectroscopy (FTIR), scanning and transmission electronic microscopy (SEM, TEM) and thermogravimetric analysis ATG. The catalytic activity of the calcined and as-synthesized catalyst was evaluated through the cycloaddition reaction of 4-nitrophenyl azide with activated alkenes at room temperature under liquid-phase conditions. High yields of 1,2,3-triazole were obtained. For comparison purpose, mixtures of homogeneous and heterogeneous catalyst Et3N/M-MCM-41 (M = Al or Ga) are also tested. The catalyst was used in five consecutive experiments without important loss of activity, confirming its stability. Finally, a new method for preparing triazoles in short reaction times was developed

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Section: Introductionmentioning

confidence: 99%

Catalytic behavior of surfactant-containing-MCM-41 mesoporous materials for cycloaddition of 4-nitrophenyl azide

Boukoussa

Zeghada

Ababsa

et al. 2015

Applied Catalysis A: General

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“…The specific structure has been suggested to be more advantageous than MCM-41 for catalytic applications because it provides more favorable mass transfer kinetics [14]. Simultaneously, the catalytic performance of M-48 can be promoted by importing the aluminum atom into its network because the acidic properties of M-48 are closely associated to the nature, concentration and distribution of the aluminum atoms that are attached to or trapped in the network of pores [9], which is beneficial to its application in the acid catalysis [15][16].…”

Section: Introductionmentioning

confidence: 99%

tert -Butylation of toluene with tert -butyl alcohol over immobilized titanium species on the Al-MCM-48

Zhou

Mao

Qin

et al. 2015

Journal of Molecular Catalysis A: Chemical

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“…Recently, the diversification of BTX sources has attracted much attention with an increased demand for BTX [1]. In the petrochemical process, a large amount of methylcyclopentane (MCP) is produced as a by-product, and the process of producing benzene from MCP has been steadily becoming important [2][3][4][5][6][7]. The reforming of MCP is known to be a combination of three types of competing reactions over the noble metal/solid acid catalysts as follows [2,[8][9][10][11][12][13]: Conversion to cyclohexane and benzene by ring enlargement (RE), conversion to n-hexane and iso-hexane via ring opening (RO), and generation of light molecules that contain less than 6 carbon atoms by cracking.…”

Section: Introductionmentioning

confidence: 99%

“…Al 2 O 3 , SiO 2 , and ZrO 2 -SiO 2 have been used as amorphous supports [12,13,[15][16][17][18]; and Y zeolite, HZSM-5, mordenite, beta zeolite, L zeolite, and AlPO 4 have been applied as zeolite supports [1,4,5,8,9,13]. Recently, studies on mesoporous materials, such as SBA-15 and MCF-17, have been reported [2,3]. As active metal sites that play a role of hydrogenation/dehydrogenation, precious metals, such as palladium, platinum, iridium, and rhodium, are mainly used in the form of a single metal or bimetal [9,10,12,[15][16][17][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Ring Enlargement of Methylcyclopentane over Pt/(HZSM-48+pseudoboehmite) Catalysts

Park

Kim

et al. 2019

Catalysts

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Platinum catalysts loaded on a hybrid support, composed of HZSM-48 and pseudoboehmite, were applied to the synthesis of benzene through methylcyclopentane (MCP) reforming in order to investigate the effect of the addition of pseudoboehmite to Pt/HZSM-48 for ring-enlargement reaction. A total of 0.5 wt% of platinum was impregnated on the hybrid support by using the incipient wetness method. Catalyst characterization was performed with nitrogen sorption, X-ray diffraction, temperature-programmed desorption of NH3, and infrared spectroscopy of adsorbed pyridine. It was found that mesoporous structures were well-developed in Pt/(HZSM-48 + pseudoboehmite) catalyst as a result of the pseudoboehmite addition, of which the average pore size was in the range of 7–8 nm. The presence of pseudoboehmite in the catalyst increases the total amount of acid sites and weakens the acid strength, compared with those of the Pt/HZSM-48 catalyst. Lewis acid sites were more abundant than Brönsted acid sites over the Pt/(HZSM-48+pseudoboehmite) catalysts. It was found that selectivity to the ring-enlargement reaction is dominant over selectivity to the ring-opening reaction over the Pt/(HZSM-48 + pseudoboehmite) catalysts. The benzene yield over Pt/(HZSM-48 + pseudoboehmite, 1:1) catalyst reached 65.1% at 450 °C and 0.3 h−1. As well as being influenced by the mesoporous structure, the higher activity and selectivity in MCP reforming was also determined by appropriate acidity of the Pt/(HZSM-48 + pseudoboehmite) catalysts.

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Single crystals of mesoporous tungstenosilicate W-MCM-48 molecular sieves for the conversion of methylcyclopentane (MCP)

Cited by 43 publications

References 47 publications

Catalytic behavior of surfactant-containing-MCM-41 mesoporous materials for cycloaddition of 4-nitrophenyl azide

Catalytic behavior of surfactant-containing-MCM-41 mesoporous materials for cycloaddition of 4-nitrophenyl azide

tert -Butylation of toluene with tert -butyl alcohol over immobilized titanium species on the Al-MCM-48

Ring Enlargement of Methylcyclopentane over Pt/(HZSM-48+pseudoboehmite) Catalysts

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