Hierarchical zeolites prepared by organosilane templating: A study of the synthesis mechanism and catalytic activity

Koekkoek, Arjan J. J.; Tempelman, Christiaan H.L.; Degirmenci, Volkan; Guo, Meiling; Feng, Zhaochi; Li, Can; Hensen, Emiel J. M.

doi:10.1016/j.cattod.2010.12.033

Cited by 58 publications

(44 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The 27 Al magic angle spinning (MAS) NMR spectra of mesoporous Al-ZSM-5 before and after calcination show signal at about 55 ppm (Figure 12), which was assigned to tetrahedrally coordinated aluminum. The catalytic activity of the mesoporous Al-ZSM-5 was tested by acetalization of cyclohexanone with methanol, and the result was compared with that of the commercial HZSM-5 (Si/Al = 23).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Polyelectrolyte–Surfactant Complex as a Template for the Synthesis of Zeolites with Intracrystalline Mesopores

Liu

Wang

et al. 2012

Langmuir

View full text Add to dashboard Cite

Mesoporous zeolite silicalite-1 and Al-ZSM-5 with intracrystalline mesopores were synthesized with polyelectrolyte-surfactant complex as the template. Complex colloids were first formed by self-assembly of the anionic polymer poly(acrylic acid) (PAA) and the cationic surfactant cetyltrimethylammonium bromide (CTAB) in basic solution. During the synthesis procedure, upon the addition of the silica source, microporous template (tetrapropylammonium hydroxide), and NaCl, these PAA/CTA complex colloids underwent dissociation and gave rise to the formation of hollow silica spheres with mesoporous shells templated by CTAB micelles and PAA domains as the core. Under hydrothermal treatment, the hollow silica spheres gradually merged together to form larger particles with the PAA domains embedded as the space occupant, which acted as a template for intracrystalline mesopores during the crystallization of the zeolite framework. Amphiphilic organosilane was used to enhance the connection between the PAA domain and the silica phase during the synthesis. After calcination, single crystal-like zeolite particles with intracrystalline mesopores of about 5-20 nm were obtained, as characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and N(2) adsorption measurements. With the addition of an aluminum source in the synthesis, mesoporous zeolite Al-ZSM-5 with intracrystalline mesopores was also synthesized, and enhanced catalytic property was observed with mesoporous Al-ZSM-5 in acetalization of cyclohexanone with methanol.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 99%

Polyelectrolyte–Surfactant Complex as a Template for the Synthesis of Zeolites with Intracrystalline Mesopores

Liu

Wang

et al. 2012

Langmuir

View full text Add to dashboard Cite

show abstract

“…For the laboratory plant experiments the degree of crystallinity must be taken into account, since only the crystalline component is relevant for catalytic activity. This applies, in particular, to the synthesis‐related lower crystallinity in the catalysts ZS16 and ZS16D . In contrast to A1RK, the last two mentioned catalysts also follow the trend of increasing crystallinity values after desilication with 0.1 M NaOH solution.…”

Section: Resultsmentioning

confidence: 79%

“…A relationship between pore connectivity and coking properties was described in literature . The influence of the change of the different acid sites on the reaction, which is due to the different synthetic methods , is still unclear.…”

Section: Introductionmentioning

confidence: 99%

Mesoporous H‐ZSM‐5 for the Conversion of Dimethyl Ether to Hydrocarbons

Zimmermann

Otto

Wodarz

et al. 2019

Chemie Ingenieur Technik

View full text Add to dashboard Cite

The potential of hierarchical H-ZSM-5 zeolites was studied for the conversion of DME to fuel-compatible hydrocarbons. For this purpose, hierarchical H-ZSM-5 zeolites have been prepared from commercial H-ZSM-5 by desilication and organosilane-directed hydrothermal synthesis. The zeolites were characterized by X-ray diffraction, NH 3 -TPD, DRIFTS, and N 2 physisorption measurements. The catalysts have been tested in a tube reactor (1 bar, 648 K). The results indicate important structural changes in framework and acidic sites, which are significant for the synthesis of gasoline-range hydrocarbons.

show abstract

“…As shown in Figure 3, samples MZ‐5(60, 0.025, 50) and MZ‐5(90, 0.025, 50) displayed typical type IV nitrogen physisorption isotherms with H1 hysteresis loops, which confirm that highly uniform mesopores were formed. The samples MZ‐5(30, 0.025, 50) and MZ‐5(120, 0.025, 50) also had typical type IV nitrogen physisorption isotherms; however, the hysteresis loops changed from H1 to H4, which represents hierarchical pore structures with disordered mesopores 31. When the H 2 O/Si ratio increased to 150, the corresponding sample MZ‐5(150, 0.025, 50) displayed a nitrogen physisorption isotherm with hysteresis loops that were hardly evident.…”

Section: Resultsmentioning

confidence: 99%

Influence of Synthesis Conditions on the Mesopore Distribution and Morphology Control of Hierarchical ZSM‐5 Zeolites Synthesized by Double‐Acyloxy Organosilane Surfactants

Han

2015

Eur J Inorg Chem

View full text Add to dashboard Cite

A novel type of double-acyloxy amphiphilic organosilanes with different alkyl chain lengths were synthesized as mesoporous templating agents to prepare mesoporous ZSM-5 zeolites. The zeolites obtained had sponge-like surfaces and variable morphology; mesopores of 4, 13, and 33 nm were constructed in the crystals without damaging their crystallinity. The H 2 O/Si ratio, Si/Al gel ratio, and organosilane tem-

show abstract

Hierarchical zeolites prepared by organosilane templating: A study of the synthesis mechanism and catalytic activity

Cited by 58 publications

References 43 publications

Polyelectrolyte–Surfactant Complex as a Template for the Synthesis of Zeolites with Intracrystalline Mesopores

Polyelectrolyte–Surfactant Complex as a Template for the Synthesis of Zeolites with Intracrystalline Mesopores

Mesoporous H‐ZSM‐5 for the Conversion of Dimethyl Ether to Hydrocarbons

Influence of Synthesis Conditions on the Mesopore Distribution and Morphology Control of Hierarchical ZSM‐5 Zeolites Synthesized by Double‐Acyloxy Organosilane Surfactants

Contact Info

Product

Resources

About