Results 131 to 140 of about 2,875 (187)

Adsorption of water on ZSM-5 zeolites

Thermochimica Acta, 1995
The non-isothermal desorption of water adsorbed on ZSM-5 zeolites at room temperature shows, depending on the cation type (H+, Na+), differently structured desorption curves. A kinetic analysis based on various methods shows that the course of desorption is well described by a first order rate equation considering a distribution function for the ...
B. Hunger, M. Heuchel, S. Matysik, K. Beck, W.D. Einicke   +4 more
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ZSM-5 Zeolite Membrane

2014
ZSM-5 (Zeolite Socony Mobil-5, patented by Mobil oil company in 1975) is a high silica zeolite with a MFI framework structure (Mobil Five) characterized by the formula |(Na x(H 2O) 16|[Al xSi 96−xO 192], where x 
Julbe, Anne, Drobek, Martin
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Adsorption of Methanol on ZSM-5 Zeolites

Langmuir, 1997
The interaction of methanol with a NaZSM-5 and a HZSM-5 zeolite was investigated by means of temperature-programmed desorption (TPD) and adsorption measurements. For both zeolites the desorption curves are structured, indicating different adsorption sites.
Bernd Hunger, Silke Matysik, Matthias Heuchel, Wolf-Dietrich Einicke   +3 more
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Crystallization kinetics of zeolite ZSM-5

Zeolites, 1992
Abstract Zeolite ZSM-5 was synthesized from aluminosilicate gels in the presence of organic templates — tetrapropylammonium bromide (TPABr) and pyrrolidine (Py) — at temperatures of 423, 438 and 453 K. Nucleation and crystallization processes were subjected to a detailed kinetic analysis.
S. Mintova, V. Valtchev, E. Vultcheva, S. Veleva   +3 more
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Diffusion of cyclohexanes in ZSM-5 zeolites

Journal of Catalysis, 1988
Abstract Diffusion coefficients have been measured for the diffusion of cyclohexane and alkylcyclohexanes ranging from methyl- to pentylcyclohexane in ZSM-5-type zeolites using the samples of flat plate-like crystallite. The uptake curves of Cyclohexanes by these samples are considered to represent primarily the diffusion of Cyclohexanes into the ...
Hakze Chon, Dong Ho Park
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Microfabricated ZSM-5 zeolite micromembranes

Chemical Engineering Science, 2004
Abstract Free-standing microfabricated (MFI) zeolite micromembranes were successfully fabricated on a silicon substrate. Three zeolites including Sil-1, ZSM-5 ( Si / Al = 60 ) and ZSM-5 ( Si / Al = 40 ) were prepared. The zeolite micromembrane units were tested for gas permeation and separation. The micromembranes displayed an
Leung, YLA, Yeung, KL
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Studies on the ZSM—5 zeolite formation

Zeolites, 1984
Abstract The crystallization of ZSM—5 zeolite, from a 3.6 Na 2 O, 6.6 TPA-Br, 1 Al 2 O 3 , 24.0 SiO 2 , 180 H 2 O system at 120°C, proceeds through various steps which have been followed by many techniques. The results suggest that a Silicalite-like zeolite initially crystallizes quickly and thereafter the aluminum enters the structure probably ...
Mario Padovan, Giuseppe Leofanti, Marcello Solari, Enrico Moretti   +3 more
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Aromatization of propene on ZSM-5 zeolites

Reaction Kinetics & Catalysis Letters, 1990
Cu-ZSM-5, CuZn-ZSM-5 and H-ZSM-5 have been studied for propene aromatization at comparable conditions. It was established that all samples are active for aromatization (yields ⋟50%) and demonstrate high selectivity for benzene, toluene and xylenes formation (⋟ 90%). The role of acid centers in all stage of the aromatization is discussed.
Z. Popova, K. Aristirova, C. Dimitrov
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Interaction of ZnO with ZSM-5 Zeolites

Collection of Czechoslovak Chemical Communications, 2000
The possibility of introduction of zinc from ZnO into cationic positions of H- and NH4-ZSM-5 zeolites by solid-state ion exchange was investigated. It was concluded that during thermal pretreatment of a mechanical mixture of ZnO with acid forms of ZSM-5 zeolite, introduction of Zn species into cationic positions as a consequence of the proposed solid ...
Edita Rojasová, Agáta Smiešková, Pavol Hudec, Zdenek Židek   +3 more
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Hydrophobic natures of zeolite ZSM-5

Zeolites, 1982
The adsorption of water, methanol, benzene, and n-hexane on a series of HZSM-5, in which SiO2/Al2O3 ratio was varied from about 50 to 900, were measured at 100°C, and their hydrophobic natures were examined. HZSM-5 preferred the less polar compound as n-hexane to other polar compounds such as water and methanol and the order of amounts adsorbed in the ...
Hiromi Nakamoto, Hiroshi Takahashi
openaire   +1 more source