Zeolite SUZ-4: reproducible synthesis, physicochemical characterization and catalytic evaluation for the skeletal isomerization of n-butenes

Asensi, M.A; Camblor, Miguel Á.; Martı́nez, Agustı́n

doi:10.1016/s1387-1811(98)00314-x

Cited by 31 publications

(13 citation statements)

References 5 publications

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“…140 kJ mol -1 , are categorized into a strongly acidic group compared to various zeolites such as H-b (130 kJ mol -1 ) and H-Y (105-120 kJ mol -1 ). This is in agreement with the high catalytic activities of zeolites under the present study [2,4,9,10,13].…”

Section: Brønsted Acid Strengthsupporting

confidence: 92%

“…Medium-pore zeolites employed here were synthesized in Teflon-lined 45 cm 3 -autoclaves according to the procedures given elsewhere [2,4,[9][10][11][12][13]. Their preparation conditions are given in Table 1.…”

Section: Zeolite Synthesismentioning

confidence: 99%

“…However, details of the Brønsted acidity in these zeolites remain to be elucidated [2,4,[9][10][11][12][13]. This is also the case of clinoptilolite (HEU), the most abundant of natural zeolites, the structure of which consists of 8-ring channels intersected by two parallel 10-and 8-ring channels [14].…”

Section: Introductionmentioning

confidence: 99%

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Ammonia IRMS-TPD Characterization of Brønsted Acid Sites in Medium-pore Zeolites with Different Framework Topologies

et al. 2010

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Section: Brønsted Acid Strengthsupporting

confidence: 92%

Section: Zeolite Synthesismentioning

confidence: 99%

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Ammonia IRMS-TPD Characterization of Brønsted Acid Sites in Medium-pore Zeolites with Different Framework Topologies

et al. 2010

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“…SAPO materials are weaker in acid strength than zeolites [60][61][62], as a result the frequency shift observed on SAPO-34 is the smallest in this work. The BET surface areas agree well with previously reported values; however, the surface area for the commercial MTT catalyst is somewhat low [13,51,[63][64][65][66]. The particle shapes and sizes presented for the materials are observed from the SEM images in Fig.…”

Section: Catalytic Testssupporting

confidence: 89%

Morphology-induced shape selectivity in zeolite catalysis

Teketel

Lundegaard

Skistad

et al. 2015

Journal of Catalysis

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a b s t r a c tZeolites are crystalline aluminosilicates that are widely used as shape-selective catalysts in the refinery and petrochemical industries. By synthesizing a series of structurally related zeolite catalyst and applying them in the industrially relevant conversion of methanol to hydrocarbons, new and extended understanding of the concept of shape selectivity has been reached. We have analyzed the relationship between particle morphology and pore system for catalysts having both small-and medium-sized pores using microscopy and diffraction, as well as performing extensive standard characterization. Two instances of preferential exposure of certain crystal facets, favoring access to one pore system over the other, have been found. Zeolites ZSM-57 (MFS) and SUZ-4 (SZR) both have both 8-and 10-ring channels. MFS prefers a plate-like or nanosheet-type morphology, where the 10-ring channels are perpendicular to the plates/sheets. This leads to favorable diffusion properties and a pronounced deactivation resistance. For SZR, needle-like crystals with high aspect ratio are preferred. In this instance, the sides of the needles are covered by the 8-ring pore openings, whereas the 10-ring pore openings are only exposed at the ends of the needles. This leads to unexpected product selectivity, as the material behaves essentially as an 8-ring catalyst. We argue that it should be possible to tune the shape selectivity of zeolite catalysts having pore systems of different dimensions by controlling the crystal morphology.

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“…The as‐made forms of ECR‐1, omega, PST‐11, UZM‐22, UZM‐4, L, clinoptilolite, SUZ‐4, and SSZ‐13 were synthesized according to the procedures described previously . Two Na‐mordenite zeolites with Si/Al ratios of 8.5 and 6.0 and a Na‐Y with a Si/Al ratio of 3.0 were obtained from ZeoChem.…”

Section: Methodsmentioning

confidence: 99%

Comparative Study of Diverse Copper Zeolites for the Conversion of Methane into Methanol

et al. 2017

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The characterization and reactive properties of copper zeolites with twelve framework topologies (MOR, EON, MAZ, MEI, BPH, FAU, LTL, MFI, HEU, FER, SZR, and CHA) are compared in the stepwise partial oxidation of methane into methanol. Cu2+ ion‐exchanged zeolite omega, a MAZ‐type material, reveals the highest yield (86 μmol g(cat.)−1) among these materials after high‐temperature activation and liquid methanol extraction. The high yield is ascribed to the relatively high density of copper–oxo active species, which form in its three‐dimensional 8‐membered (MB) ring channels. In situ UV/Vis studies show that diverse copper species form in different zeolites after high‐temperature activation, suggesting that there are no universally active species. Nonetheless, there are some dominant factors required for achieving high methanol yields: 1) highly dispersed copper–oxo species; 2) large amount of exchanged copper in small‐pore zeolites; 3) moderately high temperature of activation; and 4) use of proton form zeolite precursors. Cu‐omega and Cu‐mordenite, with the proton form of mordenite as the precursor, yield methanol after activation in oxygen and reaction with methane at only 200 °C, that is, under isothermal conditions.

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Zeolite SUZ-4: reproducible synthesis, physicochemical characterization and catalytic evaluation for the skeletal isomerization of n-butenes

Cited by 31 publications

References 5 publications

Ammonia IRMS-TPD Characterization of Brønsted Acid Sites in Medium-pore Zeolites with Different Framework Topologies

Ammonia IRMS-TPD Characterization of Brønsted Acid Sites in Medium-pore Zeolites with Different Framework Topologies

Morphology-induced shape selectivity in zeolite catalysis

Comparative Study of Diverse Copper Zeolites for the Conversion of Methane into Methanol

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