Synthesis and characterization of colloidal TBA-silicalite-2

Dong, Jin; Zou, Jing; Long, Yingcai

doi:10.1016/s1387-1811(02)00530-9

Cited by 67 publications

(48 citation statements)

References 39 publications

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“…The values of them were 377-420 m 2 /g, 0.21-0.31 cm 3 /g and 0.07-0.21 cm 3 /g, respectively. This result was consistent with the data reported by Dong [18].…”

Section: Coke Deposition Measurementsupporting

confidence: 94%

“…The particle size of Cr-Si-2(1.28%) sample was 0.3-0.5 lm in diameter. However, this result was quite different from that calculated from XRD data, indicating the large spherical particles observed in the SEM image were in fact agglomerates of nanosized primary particles of the zeolite [18]. Table 2 lists the results of homogeneous reaction between ethane and CO 2 .…”

Section: Coke Deposition Measurementmentioning

confidence: 70%

“…Figure 2 shows the N 2 adsorption/desorption isotherms of Si-2 and the group of Cr-Si-2 samples. The adsorbed volumes of N 2 for all the samples were about 110-130 m 3 /g at lower partial pressure (P/P 0 = 0.3), demonstrating that all the samples were highly crystallized and contained a considerable amount of micropores in the zeolite framework [18]. Furthermore, the isotherms of these samples were reversible, suggesting that they were typical of type I in the IUPAC classification [19].…”

Section: Coke Deposition Measurementmentioning

confidence: 89%

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Characterizations and Catalytic Properties of Chromium Silicalite-2 Prepared by Direct Hydrothermal Synthesis and Impregnation

Zhao

Wang

2010

Catal Lett

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A series of Cr-Si-2 molecular sieves have been prepared by direct hydrothermal synthesis using tetrabutylammonium hydroxide as a template. Cr/Si-2 was also prepared by conventional impregnation. The synthesized materials were characterized by X-ray diffraction (XRD), N 2 adsorption (-196°C), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and diffuse reflectance (UV-vis) spectroscopic measurements. Cr-Si-2 sample with lower content of chromium (ca.

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“…The values of them were 377-420 m 2 /g, 0.21-0.31 cm 3 /g and 0.07-0.21 cm 3 /g, respectively. This result was consistent with the data reported by Dong [18].…”

Section: Coke Deposition Measurementsupporting

confidence: 94%

Section: Coke Deposition Measurementmentioning

confidence: 70%

Section: Coke Deposition Measurementmentioning

confidence: 89%

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Characterizations and Catalytic Properties of Chromium Silicalite-2 Prepared by Direct Hydrothermal Synthesis and Impregnation

Zhao

Wang

2010

Catal Lett

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“…Here, we report for the first time the direct synthesis of fluorine-functionalized PSZ MFI and MEL. (Although similar nanocrystalline MEL syntheses have been previously described as pure MEL, [8,25] this MEL system with tetrabutylammonium hydroxide (TBAOH) as the structure-directing agent produces an MFI/MEL intergrowth. For ease of notation, we will refer to this system simply as MEL.)…”

Section: Introductionmentioning

confidence: 99%

Pure‐Silica‐Zeolite MFI and MEL Low‐Dielectric‐Constant Films with Fluoro‐Organic Functionalization

Lew

et al. 2008

Adv Funct Materials

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The synthesis of organic‐functionalized pure‐silica‐zeolites (PSZs) with MFI‐ and MEL‐type structures for low‐k applications prepared through a direct‐synthesis method by adding a fluorinated silane to the synthesis solution is reported. The added fluorine functionality increases the hydrophobicity of the zeolites, which are characterized by scanning electron microscopy, X‐ray diffraction, 29Si and 19F solid‐state NMR spectroscopy, nitrogen adsorption, and thermogravimetric analysis. The functionalized zeolite powders have low water content and calcined spin‐on films prepared from the functionalized nanoparticle suspensions exhibit higher water contact angles and lower k values (2.1 and 1.8 for the functionalized MFI‐ and MEL‐type zeolites, respectively) than PSZ films. The use of a direct‐synthesis method to decrease the moisture adsorption in the films eliminates the extra post‐spin‐on silylation steps that are traditionally used to render the zeolite films hydrophobic.

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“…Zeolites are also considered for a wide range of other applications such as chemical separation, sensing, catalysis or cooling [7][8][9][10]. For example, zeolites can be used for the development of sorption-based heat exchangers for heat recovery and cooling applications [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Pure Silica MEL and MFI Zeolite Thin Films

Coquil

Pilon

Lew

et al. 2010

2010 14th International Heat Transfer Conference, Volume 6

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This paper reports the room temperature cross-plane thermal conductivity of pure silica zeolite PSZ MEL (Socony Mobil -eleven) and MFI (Socony Mobile -five) thin films. PSZ MEL thin films were prepared by spin coating a suspension of MEL nanoparticles in 1-butanol solution onto silicon substrates followed by calcination and vapor-phase silylation with trimethylchlorosilane. The mass fraction of nanoparticles within the suspension varied from 16 to 55%. This was achieved by varying the crystallization time of the suspension. The thin films consisted of crystalline MEL nanoparticles embedded in a nonuniform and highly porous silica matrix. They featured porosity, relative crystallinity and MEL nanoparticles size ranging from 40 to 59%, 23 to 47% and 55 to 80 nm, respectively. PSZ MFI thin films were made by in-situ crystallization, were b-oriented, fully crystalline and had a 33% porosity. Thermal conductivity of these PSZ thin films was measured at room temperature using the 3ω method. Despite increases in (i) relative crystallinity, (ii) MEL nanoparticle size, and (iii) yield, as the nanoparticle crystallization time was increased, the cross-plane thermal conductivity of the MEL thin films remained nearly unchanged around 1.02±0.10 W/m·K. Indeed, the effects of these parameters on the thermal conductivity were compensated by the simultaneous increase in porosity. PSZ MFI thin films were found to have similar thermal conductivity as MEL thin films even though they had smaller porosity. Finally, the average thermal conductivity * Address all correspondence to this author.† Address all correspondence to this author.of the PSZ films was three to five times larger than that reported for amorphous sol-gel mesoporous silica thin films with similar porosity and dielectric constant.

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Synthesis and characterization of colloidal TBA-silicalite-2

Cited by 67 publications

References 39 publications

Characterizations and Catalytic Properties of Chromium Silicalite-2 Prepared by Direct Hydrothermal Synthesis and Impregnation

Characterizations and Catalytic Properties of Chromium Silicalite-2 Prepared by Direct Hydrothermal Synthesis and Impregnation

Pure‐Silica‐Zeolite MFI and MEL Low‐Dielectric‐Constant Films with Fluoro‐Organic Functionalization

Thermal Conductivity of Pure Silica MEL and MFI Zeolite Thin Films

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