Directly transforming as-synthesized MCM-41 to mesoporous MFI zeolite

Yue, Ming Bo; Sun, Lin‐Bing; Zhuang, Ting Ting; Dong, Xinfa; Yuan, Chun; Zhu, Jian Hua

doi:10.1039/b717634a

Cited by 72 publications

(60 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In current approaches to obtain hybrid materials, prefabricated zeolite seeds are assembled into mesoporous materials upon addition of surfactant and heating [3,[15][16][17][18] or pore walls of ordered mesoporous material restructured with the help of temples and recrystallization processes [19,20], and much attention has also been focused on the nanocasting method using various forms of carbon (CMKs) as template to replicate mesopore-containing zeolites [14,[21][22][23][24]. Recently, Navascués et al [5] mesoporous silica spheres seeded with silicalite-1 nanocrystals and used as an adsorbent for water, n-hexane, triisopropylbenzene and 2,2-dimethylbutane molecules to evaluate its hydrophobicity and pore accessibility.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and hydrophobic adsorption properties of microporous/mesoporous hybrid materials

Qiao

et al. 2009

Journal of Hazardous Materials

View full text Add to dashboard Cite

a b s t r a c tHybrid materials of silicalite-1 (Sil-1)-coated SBA-15 particles (MSs) have been successfully synthesized by crystallization process under hydrothermal conditions. These MSs materials were characterized by X-ray diffraction, nitrogen adsorption/desorption and TEM techniques, which illustrated that the silicalite-1-coated SBA-15 particles were successfully prepared and had large pore volume and hierarchical pore size distribution. Further experimental studies indicated that longer crystallization time under basic condition caused the mesostructure of SBA-15 materials to collapse destructively and higher calcination temperature tended to disrupt the long-range mesoscopic order while they had little influence on the phase of microcrystalline silicalite-1 zeolite. The resultant MSs materials were investigated by estimating dynamic adsorption capacity under dry and wet conditions to evaluate their adsorptive and hydrophobic properties. The hydrophobicity index (HI) value followed the sequence of silicalite-1 > MSs > SBA-15, which revealed that the SBA-15 particles coated with the silicalite-1 seeds enhanced the surface hydrophobicity, and also were consistent with FTIR results. Our studies show that MSs materials combined the advantages of the ordered mesoporous material (high adsorptive capacity, large pore volume) and silicalite-1 zeolite (super-hydrophobic property, high hydrothermal stability), and the presence of micropores directly led to an increase in the dynamic adsorption capacity of benzene under dry and wet conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis and hydrophobic adsorption properties of microporous/mesoporous hybrid materials

Qiao

et al. 2009

Journal of Hazardous Materials

View full text Add to dashboard Cite

show abstract

“…Yue et al used two nitrosamines with different structures as probe molecules to explore the adsorption behavior in micro/mesoporous composites. They found that the composites exhibit good adsorption capacity and exceed either microporous zeolite or mesoporous silica [50].…”

Section: Introductionmentioning

confidence: 98%

Atomistic simulations for adsorption and separation of flue gas in MFI zeolite and MFI/MCM-41 micro/mesoporous composite

Zhuo

Huang

et al. 2010

Front. Chem. Sci. Eng.

View full text Add to dashboard Cite

Adsorption of pure CO 2 and N 2 and separation of CO 2 /N 2 mixture in MFI zeolite and MFI/MCM-41 micro/mesoporous composite have been studied by using atomistic simulations. Fully atomistic models of MFI and MFI/MCM-41 are constructed and characterized. A bimodal pore size distribution is observed in MFI/MCM-41 from simulated small-and broad-angle X-ray diffraction patterns. The density of MFI/MCM-41 is lower than MFI, while its free volume and specific surface area are greater than MFI due to the presence of mesopores. CO 2 is preferentially adsorbed than N 2 , and thus, the loading and isosteric heat of CO 2 are greater than N 2 in both MFI and MFI/MCM-41. CO 2 isotherm in MFI/MCM-41 is similar to that in MFI at low pressures, but resembles that in MCM-41 at high pressures. N 2 shows similar amount of loading in MFI, MCM-41 and MFI/MCM-41. The selectivity of CO 2 over N 2 in the three adsorbents decreases in the order of MFI > MFI/MCM-41 > MCM-41. With increasing pressure, the selectivity increases in MFI and MFI/MCM-41, but decreases in MCM-41. The self-diffusivity of CO 2 and N 2 in MFI decreases as loading increases, while in MFI/MCM-41, it first increases and then drops.

show abstract

“…Apart from many multistep synthesis strategies [12], utilization of original mesoporogen (the surfactant template) was studied to simplify the preparation of mesoporous zeolites. Recently we added the structure-directing agent into the as-synthesized MCM-41 to prepare mesoporous zeolite [19], using the original surfactant as the necessary mesoporogen to direct the mesopore genesis of zeolite, transforming the amorphous silica wall into crystal zeolite by dry-gel conversion. Aluminum species were introduced into the composites during synthesis in order to create active sites of adsorption.…”

Section: Introductionmentioning

confidence: 99%