Results 171 to 180 of about 83,093,681 (218)
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Studies on the ZSM—5 zeolite formation
Zeolites, 1984Abstract 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 +3 more
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Aromatization of propene on ZSM-5 zeolites
Reaction Kinetics & Catalysis Letters, 1990Cu-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, 2000The 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 +3 more
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Hydrophobic natures of zeolite ZSM-5
Zeolites, 1982The 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
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Structure of synthetic zeolite ZSM-5
Nature, 1978ZEOLITE ZSM-5 (ref. 1) is a member of a new class of shape selective catalysts with unique channel structures which differ from the familiar large-pore faujasite and small-pore zeolites such as Linde Type A and erionite. They also possess unusual catalytic properties and have high thermal stability.
G. T. KOKOTAILO +3 more
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Steaming of ZSM-5 zeolite film
Zeolites, 1992Abstract The change in morphology of the ZSM-5 zeolite films during steaming at 443 K was studied. The crystal growth of zeolite, 5–10 μm in size, from the layer of microcyrstalline ZSM-5 zeolites was first visualized by scanning electron microscopy.
T. Sano +5 more
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Adsorption Properties of ZSM-5 Zeolites
Collection of Czechoslovak Chemical Communications, 1998Adsorption properties determined by physical adsorption of nitrogen for a series of ZSM-5 zeolite samples with various Si/Al ratios and different crystal size were compared. In addition to the BET method, the t-plot method was used to determine the microporosity of samples.
Pavol Hudec +6 more
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Studies in the synthesis of ZSM-5 zeolites
Zeolites, 1982ZSM-5 zeolites have been synthesized using tri-ethyl-n-propylammonium (TEPA) cations as the source of the organic base. X-ray diffraction, framework i.r. spectroscopy, scanning electron microscopy, adsorption of n-heptane and cyclohexane and product distribution in the conversion of methanol to hydrocarbons have been utilized in characterizing the ...
S.B. Kulkarni +4 more
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Zeolite Cu–ZSM-5: material characteristics and NO decomposition
Microporous and Mesoporous Materials, 2000Abstract Zeolite ZSM-5 (SiO 2 /Al 2 O 3 ratio 53:1) ion exchanged with Cu 2+ to 0%, 74% and 160% was characterized by X-ray diffraction (XRD), Thermogravimetric analysis (TGA), Infrared (IR) spectroscopy, Electron spectroscopy for chemical analysis (ESCA) and ammonia desorption. A more limited set of data was obtained for Cu–ZSM-5-33, ion exchanged
Paul, J +3 more
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Conversion of ethanol over zeolite H‐ZSM‐5
Chemical Engineering & Technology, 1994AbstractThe conversion of ethanol over H‐ZSM‐5 was studied as a function of ethanol partial pressure, reaction temperature, weight hourly space velocity and Si/Al ratio. The results obtained were in qualitative agreement with most of those in the literature.
Schulz, Juergen, Bandermann, Friedhelm
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