Results 241 to 250 of about 35,853 (285)

การเร่งปฏิกิริยาดีไฮเดรชันของเอทานอลที่มีความเข้มข้นที่ต่างกันบนตัวเร่งปฏิกิริยา Zr/SBA-15, Zr-La/SBA-15

2023
ในปัจจุบันเอทิลีนเป็นที่ต้องการเพิ่มสูงขึ้นอย่างต่อเนื่อง อุตสาหกรรมการผลิตเอทิลีนในปัจจุบันนิยมใช้กระบวนการแตกสลายทางความร้อนโดยใช้ไอน้ำ (steam thermal cracking) วัตถุดิบตั้งต้นที่นิยมใช้คือแนฟทาซึ่งเป็นสารตั้งต้นที่ใช้แล้วหมดไป กระบวนการนี้ปลดปล่อยมลพิษออกสู่สิ่งแวดล้อมอีกทั้งยังใช้อุณหภูมิสูงในการดำเนินงาน ในทางกลับกัน ปฏิกิริยาดีไฮเดรชันกำลังเป็นที่
openaire   +1 more source

Structure Sensitivity of Vibrational Spectra of Mesoporous Silica SBA-15 and Pt/SBA-15

The Journal of Physical Chemistry B, 2005
The vibrational properties of mesoporous silica (SBA-15) were investigated by deep ultraviolet (UV) Raman and infrared spectroscopies with and without the presence of platinum nanoparticles in the mesopores that were incorporated by sonication. Raman and IR spectral line assignments were made by comparison to amorphous silicas. This procedure permitted
Borodko, Y, Ager, JW, Marti, GE, Song, H Song, Hyunjoon, Niesz, K, Somorjai, GA   +5 more
openaire   +3 more sources

SBA-15 Templated Mesoporous Carbon:  New Insights into the SBA-15 Pore Structure

Chemistry of Materials, 2005
This work used a combination of designed synthesis conditions for SBA-15 to gain new insights into the genesis of micropores and secondary mesopores bridging the primary mesoporous channels. Different SBA-15 samples were prepared at low temperature (35 and 60 °C) without stirring to generate a simple monodispersed rodlike morphology.
Abdelhamid Sayari, Yong Yang
openaire   +1 more source

Recrystallisation of SBA-15 into ZSM-5/SBA-15 composites

2005
Micro/mesostructured ZSM-5/SBA-15 composites were prepared by secondary crystallisation of SBA-15 impregnated with a solution of tetrapropylammonium hydroxide and sodium aluminate. The samples were characterised by X-ray diffraction (XRD), nitrogen sorption, infrared spectroscopy (FTIR) and scanning electronic microscopy (SEM).
A.A. Campos, C.R. Silva, M. Wallau, L.D. Dimitrov, E.A. Urquieta-González   +4 more
openaire   +1 more source

Formation of cyanide-functionalized SBA-15 and its transformation to carboxylate-functionalized SBA-15

Phys. Chem. Chem. Phys., 2004
Cyanide-functionalized mesoporous silica SBA-15 (CN/SBA-15) with pore diameters larger than 6 nm has been prepared by a one-pot synthesis. The structure of CN/SBA-15 is affected by the amount of the functional silane 2-cyanoethyltriethoxysilane (CTES) and the conditions of co-condensation in the acidic aqueous solution of the triblock copolymer ...
Yang, C., Wang, Y., Zibrowius, B., Schüth, F.   +3 more
openaire   +2 more sources

Carbon material formation on SBA-15 and Ni-SBA-15 and residue constituents during acetylene decomposition

Journal of Hazardous Materials, 2014
Carbon materials including carbon spheres and nanotubes were formed from acetylene decomposition on hydrogen-reduced SBA-15 and Ni-SBA-15 at 650-850°C. The physicochemical characteristics of SBA-15, Ni-SBA-15 and carbon materials were analyzed by field emission scanning electronic microscopy (FE-SEM), Raman spectrometry, and energy dispersive ...
Hung-Lung, Chiang, Trong-Neng, Wu, Yung-Shou, Ho, Li-Xuan, Zeng   +3 more
openaire   +2 more sources

Brønsted acidity of Al/SBA-15

Microporous and Mesoporous Materials, 2012
To increase the content of well-dispersed aluminium in Al/SBA-15 and its Brønsted acidity, a water-free synthesis method involving a Si-O-Al precursor was employed to preparea series of Al/SBA-15 of widely varying composition. The materials were characterized with ICP, BET, TEM, 27Al MAS NMR and IR spectroscopy and compared to conventionally prepared ...
Koekkoek, A.J.J., Veen, van, J.A.R., Gerritsen, P.B., Giltay, P., Magusin, P.C.M.M., Hensen, E.J.M.   +5 more
openaire   +1 more source

SBA-15 templated-ordered mesoporous carbon: effect of SBA-15 microporosity

2005
Ordered mesoporous carbons (OMCs) were synthesized using SBA-15 silica as template through a two-step method of carbon precursor infiltration. Rod-like SBA-15 silica templates were prepared either in the presence or in the absence of NaCl at 35 °C or 60 °C. Furfuryl alcohol was used as carbon precursor.
openaire   +1 more source

Size effect on SBA-15 microporosity

Microporous and Mesoporous Materials, 2006
Abstract The experimental published data on SBA-15 microporosity was interpreted using a size effect approach. This approach regards the wall micropores of SBA-15 material as stress-induced defects in its pores walls. It was shown that the microporosity is the function of the ratio of the pore wall thickness to pore diameter—the characteristic ...
Leonid Vradman, Leonid Titelman, Moti Herskowitz   +2 more
openaire   +1 more source

Phenylboronic Acid Functionalized SBA-15 for Sugar Capture

Langmuir, 2011
The synthesis and characterization of organic-inorganic hybrid materials that selectively capture sugars from model biomass hydrolysis mixtures are reported. 3-Aminophenylboronic acid (PBA) groups that can reversibly form cyclic esters with 1,2-diols, and 1,3-diols including sugars are attached to mesoporous SBA-15 via different synthetic protocols. In
Yong-Hong, Zhao, Daniel F, Shantz
openaire   +2 more sources