Acidic Property of FSM-16

Yamamoto, Takashi; Tanaka, Tsunehiro; Funabiki, and Takuzo; Yoshida, Satohiro

doi:10.1021/jp980675c

Cited by 113 publications

(122 citation statements)

References 67 publications

(98 reference statements)

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“…The ability of a siliceous mesoporous structure similar to MCM-41 (FSM-16), to catalyze the isomerization of α -pinene was already reported by Yamamoto et al [31].…”

Section: Catalytic Testsmentioning

confidence: 90%

“…4A (150 ºC). The spectra display bands at 1547 and 1639 cm -1 assigned to pyridine adsorbed on Brönsted acid sites, bands at 1454 and 1621 cm -1 assigned to pyridine adsorbed on Lewis acid sites and a band at 1491 cm -1 characteristic of pyridine adsorbed on both sites [31]. The spectra of AlMCM-41 and MSU-S(MFI) show further bands at 1445 and 1598 cm -1 that have been assigned to H-bonded pyridine [31] or to a pyridine molecule adsorbed on a Lewis acid site and interacting through hydrogen bonding with a protonic site [32].…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

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Al-containing MCM-41 type materials prepared by different synthesis methods: Hydrothermal stability and catalytic properties

Lourenço¹,

Fernandes²,

Henriques³

et al. 2006

Microporous and Mesoporous Materials

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Al-containing MCM-41 type materials were prepared by three different synthesis methods (aluminum grafting on the calcined MCM-41, pH adjustment during the crystallization period and crystallization in the presence of zeolite seeds). The samples were characterized by powder XRD, nitrogen adsorption, 27 Al MAS NMR and FTIR with pyridine as probe molecule. All the samples exhibit a high hydrothermal stability at high temperature just with a minor structural degradation. N 2 adsorption data obtained for the sample prepared from a gel containing zeolite seeds suggest a higher structural resistance to the hydrothermal treatment in comparison with the samples prepared by other methods. A different type of pyridine adsorbed, probably interacting simultaneously with a Brönsted and a Lewis acid site, is observed upon pyridine adsorption. This type of adsorption is stronger for the sample prepared in the presence of zeolite seeds and is not observed on Al-grafted MCM-41. 2The catalytic activity towards the isomerization of α-pinene depends mainly on the number of Brönsted acid sites. The data obtained in this study strongly indicate that for this type of materials, the Lewis acid sites do not influence the selectivity for the isomerization products.

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“…The ability of a siliceous mesoporous structure similar to MCM-41 (FSM-16), to catalyze the isomerization of α -pinene was already reported by Yamamoto et al [31].…”

Section: Catalytic Testsmentioning

confidence: 90%

Section: Synthesis and Characterizationmentioning

confidence: 99%

Al-containing MCM-41 type materials prepared by different synthesis methods: Hydrothermal stability and catalytic properties

Lourenço¹,

Fernandes²,

Henriques³

et al. 2006

Microporous and Mesoporous Materials

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show abstract

“…For example, the greater surface areas such as 815 1078 m 2 /g supplied by Toyota Central R & D labs, Inc. (Lot no. NG78-550), 14) as well as 1070 and 1100 m 2 /g prepared by Inagaki et al 8) were reported. The samller surface area of FSM-16 prepared in the present study would indicate that it contains tridymite as impurities.…”

Section: Characterization Of Fsm-16 and Cr-fsm-16mentioning

confidence: 92%

Effect of the template ion exchange behaviors of chromium into FSM-16 on the oxidative dehydrogenation of isobutane

Ehiro

Itagaki

Kurashina

et al. 2015

J. Ceram. Soc. Japan

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The template ion exchange of chromium cations into FSM-16 (#16 Folded Sheets Mesoporous Materials) for 247 h resulted in a 2.89 wt % incorporation of those cations into the FSM-16, although only a 0.3 wt % incorporation had previously been reported. The XRD pattern of the resultant solid (Cr-FSM-16) showed that the hexagonal structure characteristic of FSM-16 remained after the 2.89 wt % incorporation of chromium cations. XPS could be used to detect the Cr 3+ and Cr 6+ species on the surface of Cr-FSM-16. A pre-edge peak that was due to a tetrahedrally coordinated Cr 6+ species was confirmed in the XANES spectrum of the Cr-FSM-16, which showed that the coordination state around some Cr species was similar to that around the Si species in FSM-16. With the increase in the amount of chromium cations in FSM-16, its catalytic activity and stability during the oxidative dehydrogenation of isobutane were evidently improved.

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“…We independently found that siliceous mesoporous silica FSM-16 promoted some acid catalyzed reactions, and have been investigating the acidic properties of FSM-16. We proposed that weakly perturbed silanol groups on the surface of the specific hexagonally ordered pore structure with thin wall act as Brønsted acid sites, with medium strength of H0 3.0 41) , and strained siloxane bridges formed by dehydration of isolated silanol groups act as the Lewis acid site 42) . The catalytic activity for 2-butanol dehydration was found to depend on pore size of FSM-16 in the range of 1.8 to 3.8 nm (Fig.…”

Section: )mentioning

confidence: 99%

X-ray Absorption Spectroscopic Characterization of Solid Acid-base Catalysts

Yamamoto

2014

J. Jpn. Petrol. Inst.

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Recent X-ray absorption spectroscopic studies of solid acid-base catalysts were reviewed, which have been carried out to investigate the effects of lanthanum-ion addition to alumina for improving the thermal stability, acidity generation mechanism of siliceous mesoporous silica, or state of tungsten oxide species in WOx _ ZrO2 strong solid acid. Remarks on EXAFS analytical procedures were also discussed about possibility of coexistence of multiple phases, mismatch between radial distribution functions and Fourier transforms of EXAFS, and effects of multiple excitations in an X-ray absorption spectrum.

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Acidic Property of FSM-16

Cited by 113 publications

References 67 publications

Al-containing MCM-41 type materials prepared by different synthesis methods: Hydrothermal stability and catalytic properties

Al-containing MCM-41 type materials prepared by different synthesis methods: Hydrothermal stability and catalytic properties

Effect of the template ion exchange behaviors of chromium into FSM-16 on the oxidative dehydrogenation of isobutane

X-ray Absorption Spectroscopic Characterization of Solid Acid-base Catalysts

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