Large-Pore Mesoporous Materials with Semi-Crystalline Zeolitic Frameworks

On, D. Trong; Kaliaguine, Serge

doi:10.1002/1521-3773(20010903)40:17<3248::aid-anie3248>3.0.co;2-m

Cited by 219 publications

(60 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The transmission electron micrograph (TEM) was taken on a JEOL 3010 microscope operating at an accelerating voltage of 300 kV. 27 Al NMR spectra were recorded on Varian Infinity plus 400 spectrometer and chemical shifts were referenced to Al(H 2 O) 6 3+ . Thermogravimetric and differential thermal analysis (TG-DTA) were carried out on a NETZSCH STA 449C with a heating rate of 20 • C/min from room temperature to 1100 • C. The sample was mounted horizontally and purged with a synthetic airflow of 100 ml/min.…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

“…5 shows 27 Al MAS NMR spectra of Al-MSZ-5 and Al-SZ. Both samples exhibit a sharp peak at around −5.0 ppm and a broad peak centered at around 18 ppm, though the peak widths and peak intensities are different.…”

Section: Nmr Spectroscopymentioning

confidence: 99%

“…In 1992, it has been reported that mesoporous materials with highly ordered pore structures have potential applications in catalysis, adsorption and separation of molecules because of their high surface areas, large pore volume, and tunable uniform pore structures, but they show relatively weak acid strength [22][23][24][25][26][27][28]. To increase the acid strength of mesoporous materials, sulfated zirconia was introduced into the mesopores such as MCM-41 [29][30][31][32][33][34], FSM-16 [35], and SBA-15 [36,37].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improved catalytic activity and stability of mesostructured sulfated zirconia by Al promoter

Sun

Yuan

et al. 2004

Applied Catalysis A: General

View full text Add to dashboard Cite

Section: Characterization Of Catalystsmentioning

confidence: 99%

Section: Nmr Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improved catalytic activity and stability of mesostructured sulfated zirconia by Al promoter

Sun

Yuan

et al. 2004

Applied Catalysis A: General

View full text Add to dashboard Cite

“…The route to synthesis of hybrid materials consisting of MCM-41/FAU and MCM-41/MFI were paved by van Bekkum and Urquieta-Gonzáles groups [7][8][9][10]. The wormhole-type molecular sieve was also used for preparation of the UL/ZSM-5 composites [11]. Similar strategies were applied later for synthesis of the SBA-15/MFI hybrids [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Composite SBA-15/MFI Type Materials: Preparation, Characterization and Catalytic Performance

et al. 2008

View full text Add to dashboard Cite

SBA-15 type mesoporous molecular sieve was prepared and used as a parent material for synthesis of a SBA-15/zeolite composite. Thus, after addition of an aluminum source into the pristine sample, it was subjected to recrystallization in the water-vapor phase to give the SBA-15/MFI composites. The samples obtained were characterized by XRD, nitrogen sorption, scanning and transmission electron microscopies, 27 Al MAS NMR and FT IR. The materials after recrystallization retained their mesoporous character. Characteristics of the material revealed that all the aluminum added was inserted into the final hybrid. As shown by FT IR and NMR, at least some of aluminum was introduced into the nanoparticles of MFI and adopted fourfold coordination, typical for zeolites. Formation of Brøns-ted acid centres was directly confirmed by IR studies. The catalytic activity was screened in the liquid-phase isomerization of a-pinene. The main products of a-pinene transformations were camphene, limonene and c-terpinene. The overall selectivity toward camphene ? limonene was ca. 90%. Taking into account the low amount of the MFI phase present in a composite sample, calculated initial reaction rate was comparable with other catalytic systems explored in the isomerization of a-pinene.

show abstract

“…UL-zeolites are known to have bi-porous structure consisting of micro-and mesopores in which zeolites are in the form of nano-particles, and are intergrown in one-dimensional mesoporous structure being used as a matrix. This novel class of composite materials is able to overcome the limitation of both zeolites and MMS materials and is expected to have more potential for applications in industry (Trong-On et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Diffusion Characterization of a Novel Mesoporous Zeolitic Material

et al. 2005

Self Cite

View full text Add to dashboard Cite

The last several years have seen a dramatic increase in the synthesis of new nanoporous materials. The promising ones include mesoporous molecular sieves (MMS) which are being developed as inorganic systems with 20-300Å in pore dimensions, and having a narrow pore-size distribution. More recently significant efforts have been made to obtain MMS materials with enhanced hydrothermal stability and acidity. UL-zeolites belong to this class of materials in which zeolites are in the form of nano-particles, and are inter-grown in one-dimensional mesoporous structure being used as a matrix, e.g., SBA-15. UL-silicalite is one of the typical representatives of the UL-zeolites. These composite zeolitic materials possess a unique bi-porous structure consisting of micro-and mesopores. The main objective of this study is to characterize UL-silicalite with respect to its transport (diffusive) property and correlate this property with its structure using the zero length column (ZLC) method. n-Heptane, toluene and oxylene were chosen as probe molecules with different kinetic diameters. Results reveal that the transport process of these probe molecules in UL-silicalite seems to be governed by combined surface/mesopore diffusion in which interconnecting micropores can also make a contribution to the overall transport process. The one-dimensional mesopore structure has strong influence on the overall transport rate. The obtained effective diffusivities of the probe molecules in UL-silicalite were found to be over one order of magnitude higher than in pure silicalite crystals, which were used as reference samples.

show abstract

Large-Pore Mesoporous Materials with Semi-Crystalline Zeolitic Frameworks

Cited by 219 publications

References 27 publications

Improved catalytic activity and stability of mesostructured sulfated zirconia by Al promoter

Improved catalytic activity and stability of mesostructured sulfated zirconia by Al promoter

Composite SBA-15/MFI Type Materials: Preparation, Characterization and Catalytic Performance

Diffusion Characterization of a Novel Mesoporous Zeolitic Material

Contact Info

Product

Resources

About