ZSM-5 zeolite is an aluminosilicate that usually has a high silica-to-alumina ratio. It contains two sets of nanopores. One set of nanopores is straight, with the cross-sectional size of 5.3 5.6 Å; the other set is Sshaped, with the cross-sectional size of 5.2 5.5 Å. An A1 atom at the center of an AlO4 tetrahedron connects to adjacent SiO4 tetrahedron by sharing an O atom and thus generates a n...

The dehydroaromatization of methane (MDA) is great interest as a promising process for processing natural and associated petroleum gases, the main component which methane. rapid loss catalyst activity because coke formation hinders introduction DHA into industry. Therefore, aim this research was to find ways improve Mo/ZSM-5 catalysts MDA. paper presents results synthesis high-silica zeolites Z...

Recently many nanoporous carbons have been synthesized using templating method. On the contrary, carbons can be applied as the template, because carbon can be gasified. Zeolite molecular sieves are crystalline porous solids with intricate pore and channel systems in the molecular size range of 0.3 to ~3 nm. They are widely used in industry as heterogeneous catalysts [1]. Although micropores of ...

(27) Al 3Q MAS NMR and UV/Vis spectroscopy with bare Co(II) ions as probes of Al pairs in the zeolite framework were employed to analyze the location of framework Al atoms in the channel system of zeolite ZSM-5. Furthermore, the effect of Na(+) ions together with tetrapropylammonium cation (TPA(+)) in the ZSM-5 synthesis gel on the location of Al in the channel system was investigated. Zeolites...

mfi-type zeolite membranes (zsm-5) were prepared on α-alumina tubular supports and tested for separation of h2/co mixtures. the effect of pressure and temperature on h2 and co flows and selectivity was investigated. the best results in this work were obtained with a zsm-5 membrane prepared over a porous α-alumina tube seeded with zeolite nanocrystals synthesized with microwave technique. in thi...

ZSM-5 zeolite was rapidly synthesized in system containing ethylenediamine from the initial gel: (5-8) Na(2)O: 44 EDA:Al(2)O(3):100 SiO(2):4000 H(2)O. The crystals were lath-shaped. The effect of pretreatment and alkalinity on crystallinity was investigated. The pretreatment of silicate source can cut down the crystallization time. Tuning the system alkalinity and controlling crystallization ti...

The precise pore sizes defined by crystalline zeolite lattices have led to intensive research on zeolite membranes. Unfortunately, zeolites have been extremely difficult to prepare in a defect-free thin film form needed for membrane flux and selectivity. We introduced tetrapropylammonium (TPA), a structure-directing agent for zeolite ZSM-5, into a silica sol and exploit the development of high ...

A ZSM-5 molecular sieve composite with a wide pore prepared by the solid phase in-situ synthesis method and fluid catalytic cracking, an FCC catalyst additive same for increasing amount of light olefin yield were investigated. The samples characterized XRD, N2 adsorption/desorption, SEM, NH3-TPD, respectively. results showed that structure was pure MFI-type zeolite material. crystallinity 59.8 ...