Pore-Size Dependence of the Acidic Property of Mesoporous Silica FSM-16

Yamamoto, Takashi; Mori, Shigehisa; Shishido, Tetsuya; Kawai, Jun; Tanaka, Tsunehiro

doi:10.1007/s11244-009-9217-1

Cited by 9 publications

(9 citation statements)

References 28 publications

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“…A possible reason for the lower catalytic activity of M41-pH4.5 was the partial destruction and/or distortion of the hexagonally ordered structure that is characteristic of the parent M41. It was presumed that the regularity and/or uniformity of the pore structure could affect the intrinsic acidity of FSM-16 (Yamamoto et al, 2009). Iwamoto et al (2003) proposed that an assembly of weakly acidic OH on the uniform surface of MCM-41 may act as an effective and strong acid site.…”

Section: Catalytic Activity Of the Silica Catalystsmentioning

confidence: 99%

“…Considering the above reports and the present results of the characterization and catalytic activity test, the ordered mesoporous structure seemed to be essential to great catalysis for the ODH of isobutane. The great catalytic activity of mesoporous silicas has been reported in reactions wherein the regular mesopore structures of the silica catalysts seemed to be an essential element (Ishitani and Iwamoto, 2003;Iwamoto et al, 2003;Ishitani et al, 2008;Yamamoto et al, 2009).…”

Section: Catalytic Activity Of the Silica Catalystsmentioning

confidence: 99%

“…In fact, the average pore diameter became longer as degradation of an ordered mesostructure was caused by acid treatment (M41-pH4.5, M41-pH5.5, and M41-pH6.5 in Table 1). The pore sizes of the mesoporous silicas are considered crucially important to the catalytic activities of the acid-catalyzed reactions (Iwamoto et al, 2003;Yamamoto et al, 2009). To confirm the effect of the pore size on the catalytic activity, acid-treated M41s were prepared from different templates.…”

Section: Catalytic Activity Of the Silica Catalystsmentioning

confidence: 99%

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Effects of Acid Treatment on the Acidic Properties and Catalytic Activity of MCM-41 for the Oxidative Dehydrogenation of Isobutane

Ehiro

Itagaki

Misu

et al. 2016

J. Chem. Eng. Japan / JCEJ

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Mesoporous silicas have shown promise as materials for solid catalysts or catalyst supports due to their unique characteristics. Metal-doped mesoporous silicas are known to be catalytically active in the oxidative dehydrogenation (ODH) of isobutane. However, heavy-metal-free mesoporous silicas have not been studied closely for their use as catalysts. In the present study, MCM-41 (#41 Mobil composition of matter) was acid-treated to enhance its catalytic activity, although pure MCM-41 was confirmed as catalytically inactive for the ODH of isobutane (isobutene yield = 0.9%). The pH of a slurry of as-synthesized MCM-41 was changed during acid treatment. A pH adjustment to 6.5 resulted in great improvement in catalytic activity (isobutene yield = 6.1%), but a pH adjustment to 4.5 resulted in insufficient improvement (isobutene yield = 4.5%). It was confirmed via XRD and N 2 adsorption-desorption measurement that the pH adjustment to 4.5 degraded the ordered structure of MCM-41. This degradation would be a crucial factor that would render acid treatment less effective. In addition to the acid treatment, Al doping to MCM-41 was conducted. Al doping also greatly enhanced the acidity and catalytic activity of MCM-41.

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Section: Catalytic Activity Of the Silica Catalystsmentioning

confidence: 99%

Section: Catalytic Activity Of the Silica Catalystsmentioning

confidence: 99%

Section: Catalytic Activity Of the Silica Catalystsmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Acid Treatment on the Acidic Properties and Catalytic Activity of MCM-41 for the Oxidative Dehydrogenation of Isobutane

Ehiro

Itagaki

Misu

et al. 2016

J. Chem. Eng. Japan / JCEJ

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“…A similar "confinement effect" has been confirmed in other catalytic systems. [67][68][69][70] The detailed reason for such an effect is still not clear. In more general terms, the pore size and wall thickness of mesoporous metal oxides have been demonstrated to influence their performance in lithium batteries 52 and chemical sensors.…”

Section: Discussionmentioning

confidence: 99%

Catalytic Decomposition of N<SUB>2</SUB>O on Ordered Crystalline Metal Oxides

Ren²,

Lu³

et al. 2013

j. nanosci. nanotech.

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The synthesis of mesoporous metal oxides using mesoporous silicas or carbons as hard templates has attracted growing interest recently, but the catalytic application of mesoporous metal oxides has not been studied sufficiently. In addition, few publications have compared the catalytic performance of a series of mesoporous metal oxides in the same reaction, and little is known about the influence of preparation details of mesoporous metal oxides on catalytic activity. Herein, ordered crystalline mesoporous metal oxides (i.e., CeO2, Co3O4, Cr2O3, CuO, alpha-Fe2O3, beta-MnO2, Mn2O3, Mn3O4, NiO) prepared using mesoporous SiO2 (KIT-6) as a hard template were tested in the decomposition of N2O, an environmental pollutant, and the catalytic performance was compared with that of commercial metal oxides with low surface areas. In particular, mesoporous Co3O4, beta-MnO2, and NiO showed high N2O conversions at 350 degrees C. The influence of preparation parameters of mesoporous Co3O4 on catalytic activity was then studied in more detail. Mesoporous Co3O4 samples with different pore sizes and wall thicknesses were prepared using KIT-6 synthesized under different hydrothermal or calcination temperatures. Interestingly, the catalytic activities of different mesoporous Co3O4 samples were found to be influenced by these preparation details.

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“…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. 10) 44) as for acetalization by MCM-41 49) . We have also confirmed that amorphous silicas prepared from the same raw materials as the active FSM-16 were inactive, and collapsed FSM-16 without ordered porosity was as well.…”

Section: )mentioning

confidence: 96%

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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Pore-Size Dependence of the Acidic Property of Mesoporous Silica FSM-16

Cited by 9 publications

References 28 publications

Effects of Acid Treatment on the Acidic Properties and Catalytic Activity of MCM-41 for the Oxidative Dehydrogenation of Isobutane

Effects of Acid Treatment on the Acidic Properties and Catalytic Activity of MCM-41 for the Oxidative Dehydrogenation of Isobutane

Catalytic Decomposition of N<SUB>2</SUB>O on Ordered Crystalline Metal Oxides

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

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