Ordered and disordered pNA molecules in mesoporous MCM-41

Sulfonic acid functionalised SBA-15 as catalysts for Beckmann rearrangement and esterification reaction

“…Both the reason that the two pores system loses the order of the hexagonal pore structure and the reason that the introduction of arenesulfuric group into the channel of SBA-15 can lead to a substantial loss in scattering contrast between the channel and the wall [10] are responded to the poor XRD pattern of these functionalized materials. Simultaneously, the two pore systems also suggest that the arenesulfuric group probably concentration in some part of the channel in contrast to distribute orderly in the channel.…”

The epoxidation of allyl alcohol on Ti-complex/MCM-48 catalyst

“…On the contrary, the diffraction peaks of (4 2 0) and (3 3 2) disappeared completely in the case of sample c (using Ti(O i Pr) 4 as Ti-source) and the intensity of (2 1 1) and (2 2 0) peaks decreased much more. This result showed that the incorporation of Ti-complexes into the channel of MCM-48 leads to a substantial loss in scattering contrast between the channel and the wall, and then reduces the intensity of the scattered X-ray in the powder diffraction experiment [13]. Due to the larger volume of Ti(O i Pr) 4 , this change was more obvious for sample c. In addition, the diffraction peak corresponding to the bulk TiO 2 (2h = 25.5) in the high degree region does not appear for both treated MCM-48 samples (not shown here) and their UV-visible spectra (see the supporting material, Fig.…”

<b>CATALYTIC PROPERTIES AND ACIDITY OF MODIFIED MCM-41 MESOPOROUS MATERIALS WITH LOW Si/Al RATIO: HEPTANE ISOMERISATION</b>

“…Their structure and texture confer to these materials important catalytic and adsorptive properties [3]. Potential applications of these mesoporous molecular sieves are as exciting as their discovery.…”

“…Potential applications of these mesoporous molecular sieves are as exciting as their discovery. In earlier work mesoporous materials were used as catalysts relating to their above characteristics [3,4]. Catalytic reactions with MCM-41, one of a family of mesoporous materials with regular well-defined 15-100 Å channels, in acid medium were tested with good results [5].…”