Dehydroaromatization of methane under non-oxidative conditions over bifunctional Mo/ITQ-2 catalysts

Martı́nez, Agustı́n; Peris, Encarna; Sastre, Germán

doi:10.1016/j.cattod.2005.07.051

Cited by 47 publications

(37 citation statements)

References 28 publications

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“…10a), the benzene selectivity exhibits an optimum around 4 h. The initially low benzene selectivity relates to the conversion of some Mo/ITQ-2 showed the lowest benzene selectivity (~30 wt%). The higher benzene selectivity of Mo/MCM-22 compared to Mo/ITQ-2 is in keeping with previous findings [58]. The benzene selectivity inversely correlates with the coke selectivity.…”

Section: Catalytic Activity Measurements: Methane Dehydroaromatizationsupporting

confidence: 92%

“…Table 1 MCM-22(p) was delaminated to a significant extent. Still, the surface area of our ITQ-2 is lower compared with some of the values reported before for this material starting from laminar precursors prepared with higher Si/Al ratios [58]. The lower surface area of our ITQ-2 material is likely due to the difficulty of delaminating MCM-22(p) with relatively high Al content (Si/Al ratio ~15) [58].…”

Section: Acid Catalyst Preparation and Physico-chemical Propertiesmentioning

confidence: 55%

“…Internal silanols are characterized by the peak at 6.1 ppm. The content of the various hydroxyl species as determined from these NMR spectra are listed in Table 2 observed by 27 Al MAS NMR spectroscopy and literature [58].…”

Section: Acidity Characterizationmentioning

confidence: 99%

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One-pot synthesis of nano-crystalline MCM-22

Tempelman

Portilla

Martínez-Armero

et al. 2016

Microporous and Mesoporous Materials

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Nano-crystalline MCM-22 zeolite was synthesized in a one-pot procedure by the use of an organosilane (dimethyl-octadecyl-(3-trimethoxysilylpropyl)-ammonium chloride, TPOAC) in the zeolite synthesis gel. This crystal growth inhibition procedure introduced mesopores in the MCM-22 crystallites. The lower mechanical stability of the nano-crystalline MCM-22 zeolite compared with bulk MCM-22 can be countered to some extent by pillaring. The increased external surface of the microporous zeolite domains resulted in increased accessibility of the Brønsted acid sites, as followed from the better performance in liquidphase benzene alkylation with propylene as compared with bulk MCM-22. The increased accessibility of the internal acid sites in Mo-loaded hierarchical MCM-22 was also evident from the improved benzene selectivity during methane aromatization. Silylation of hierarchical Mo/MCM-22 was detrimental for the catalytic performance in MDA. The nano-crystalline MCM-22 has physico-chemical and catalytic properties intermediate between those of MCM-22 and ITQ-2 with the benefit over ITQ-2 that it can be synthesized in a single step.

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Section: Catalytic Activity Measurements: Methane Dehydroaromatizationsupporting

confidence: 92%

Section: Acid Catalyst Preparation and Physico-chemical Propertiesmentioning

confidence: 55%

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One-pot synthesis of nano-crystalline MCM-22

Tempelman

Portilla

Martínez-Armero

et al. 2016

Microporous and Mesoporous Materials

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show abstract

“…Some researchers [32,151] studied the dealumination of MCM-22 zeolite by refluxing in an aqueous solution of 6 M HNO 3 at 100 • C for 10 h. The strong Brønsted acid sites were effectively removed, and the catalytic performance of the dealuminated Mo/HMCM-22 in MDA was significantly enhanced. Treatment of the zeolite support in a stream of N 2 [152,153], with an aqueous solution of NH 4 F [154,155], or with oxalic acid [52,156], has also been proven to be successful in preparing dealuminated Mo/zeolite catalysts that are more active and more stable in MDA. Migration and location of Mo species, as crucial factors in MDA, are closely related to the number of Brønsted acid sites.…”

Section: Optimizing the Zeolite Supportmentioning

confidence: 99%

Recent progress in methane dehydroaromatization: From laboratory curiosities to promising technology

Guo

Zhao

et al. 2013

Journal of Energy Chemistry

222

183

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“…124 Inside of the delaminated MWW catalysts obtained from the incorporation of metallic nanoparticles, bi-functional ITQ-2 materials were prepared combining Brönsted acidity due to framework aluminum with the presence of Mo species onto external surface, being efficiently used for methane dehydroaromatization (MDA) reaction. 125 Also, exfoliated catalysts based on Ni and Co nanoparticles, supported on purely siliceous ITQ-2, were successfully used for bioethanol steam reforming. 126 The high accessibility and zeolitic acid strength of ITQ-2 have expanded the possibilities of zeolites for catalytic applications into the field of fine chemicals preparation as demonstrated in our group.…”

Section: mentioning

confidence: 99%