Rietveld refinement of the zorite structure of ETS-4 molecular sieves

Cruciani, Giuseppe; Luca, Pierantonio De; Nastro, A.; Pattison, Philippa

doi:10.1016/s1387-1811(97)00051-6

Cited by 93 publications

(83 citation statements)

References 8 publications

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“…The synthesis of ETS-4 was first reported in a patent by Kuznicki in 1989 [68]. The structure of ETS-4 was reported in 1998 [69]. The framework of ETS-4 is very similar to that of the previously reported mineral zorite (Na 6 [Ti(Ti 0.9 Nb 0.1 )(Si 6 O 17 ) 2 -(O,OH) 5 ] Á 11 H 2 O) and consists of chains of six coordinated titanium octahedra in the b direction.…”

Section: Ets-4mentioning

confidence: 99%

Stacking disorders in zeolites and open-frameworks – structure elucidation and analysis by electron crystallography and X-ray diffraction

Willhammar¹,

Zou²

2013

Zeitschrift für Kristallographie - Crystalline Materials

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Abstract. Intergrowth and stacking disorders are often found in minerals and synthetic zeolites and inorganic openframeworks. Structure elucidation of stacking disorders in these materials have been difficult and structure solution of stacking disorders in unknown zeolites and open-frameworks has been challenging. There exist no standard methods for structure analysis of such disordered materials. In this review we present various stacking disorders and intergrowth in a number of representative zeolite families containing stacking disorders. These include zeolite beta, SSZ-26/SSZ-33, ITQ-39, ABC-6, ZSM-48, SSZ-31, UTD-1, faujasite FAU/EMT, pentasil ZSM-5/ZSM-11, ITQ-13/ITQ-34, ITQ-22/ITQ-38 etc. Stacking disorders in open-frameworks containing mixed coordinations, including titanosilicates ETS-10 and ETS-4, and the silicogermanate SU-JU-14 are also described. Various crystallographic methods used for solving disordered structures are summarized. The methods include powder X-ray diffraction (PXRD), electron diffraction, high resolution transmission electron microscopy (HRTEM), and single-crystal X-ray diffraction. Examples of model building combined with simulations of PXRD and single crystal X-ray diffraction to verify the structure models are given.

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Section: Ets-4mentioning

confidence: 99%

Stacking disorders in zeolites and open-frameworks – structure elucidation and analysis by electron crystallography and X-ray diffraction

Willhammar¹,

Zou²

2013

Zeitschrift für Kristallographie - Crystalline Materials

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“…A later single crystal investigation of Na-ETS-4 33 confirmed the five coordinated titanium where the Ti-O distance varies between 1.96 Å and 1.70 Å, respectively. The powder X-ray diffraction investigation of Na-ETS-4 34 and Sr-ETS-4 31 gave controversial conclusions about the six-coordination of the titanium in the bridging unit. While the Na-ETS-4 was claimed to have sixcoordinated titanium, in Sr-ETS-4 it was confirmed to have five-coordinated titanium from the single crystal data.…”

Section: Crystal Structure and Zinc Ion Distribution Of Zn-ets-4mentioning

confidence: 99%

“…This means that around the bridging units there are highly charged unsaturated zones and charge-balancing protons are required. Similarly to Na1 in Na-ETS-4, 33,34 Zn1 is eight-coordinated by two water molecules and six oxygens. However, Zn2 shows coordination of five oxygens which differ from the seventh coordination observed for this position in the Sr-and Na-ETS-4.…”

Section: Crystal Structure and Zinc Ion Distribution Of Zn-ets-4mentioning

confidence: 99%

“…However, Zn2 shows coordination of five oxygens which differ from the seventh coordination observed for this position in the Sr-and Na-ETS-4. 31,34 The water molecules in Zn-ETS-4 occupy three sites that are disordered over the 6-ring openings (O21) and the 8-ring channels (O22 and O23), corresponding to 6.62 water molecules per formula unit (8%). This amount is less than the estimated 12.6% weight loss which supports the presence of a number of hydrogen connected oxygens.…”

Section: Crystal Structure and Zinc Ion Distribution Of Zn-ets-4mentioning

confidence: 99%

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A microporous titanosilicate for selective killing of HeLa cancer cells

et al. 2013

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“…El motivo es su relación química con el silicio, junto a la actividad y selectividad de los catalizadores que contienen Ti en las reacciones de oxidación, epoxidación, y también en procesos fotoquímicos. Existen varias zeolitas que contienen Ti, bien siendo isoestructurales a los aluminosilicatos correspondientes (TS-1 (MFI), [68] TS-2 (MEL), [69] Ti-β [70] ), o bien nuevas estructuras (ETS-4, [71] ETS-10, [72] etc. ).…”

Section: B-o-si 129ºunclassified

Síntesis de nuevos materiales microporosos mediante técnicas de alta capacidad ("High-Throughput").

Moliner¹

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MEMORIA Agradecimientos / AgraïmentsDesprés de cinc anys de treball conjunt i convivència amb molt gent, arriba el moment de ficar-se sentimental i agrair a tots els que han fet possible que aquesta tesi haja sigut una realitat.En primer lloc, voldria agrair als meus directors de tesi per tot allò que he après d'ells durant este temps. A Avelino Corma, director del centre i moncofero universal, per tot el que representa poder treballar amb ell i al ITQ, i a Mª José Díaz, per ser una excepcional jefa i millor amiga.A Amparo Mifsud, gerent del ITQ, per ajudar-me en tot moment i facilitar tots els tràmits necessaris, i a molts investigadors que sempre han tingut les portes obertes, especialment a Vicent Fornés, Fernando Rey, Miguel Ángel Miranda, Jaime Primo i Agustín Martínez. També a Pablo Miguel, ja que gràcies a ell vaig entrar en el món de la investigació. A la gent d'administració, taller i caracterització, però en especial, a Javi Herrera, amb el que he compartit moltes hores en l'educació del nostre xiquet.Però tot açò no tindria ningún sentit sense tots vosatros, amb els que he compartit el dia a dia, amb els que he viscut xicotets i grans moments. Seria impossible nomenar a tots, i segur que me deixe a molta gent, però de tots m'emporte algo.Hi ha dos persones a les que volia agrair principalment la seua ajuda i amistat.Per un costat a Pedro Serna, ja que després de "Tip i Coll" crec que no hi ha hagut una parella artística amb més continuïtat que la que forme amb ell. Fa més de 22 anys que conec al Pierrr, en els quals hem passat per tota classe de moments possibles. Per un altre a Isabel Millet, que a més de participar directament en el desenvolupament d'este treball, ha sigut una confident i una amiga molt especial.Al gran Cantín, companyero en mil i una batalla, gran professional i gran amic; Tomás, impresentable organitzador d'events però un tio grande; Logán Baumes, "liver" entre los "livers"; Isabel "la de mentira" Minuesa, gran fitxage de última hora vinguda del más allá; a Carmen, Cris Ibañez i Pablo, per tantes xarrades furtives; Aroa i Cris Franch, les meues muncoferes preferides; Gonzalo "gran-demente", però també gran anfitrión; Antonio Leyva i Jose Cabeza, gràcies per tants sopars de guarros, se vos echa de menos; Violeta, per els moments sexys compartits; Ana Maymó, pels bailoteos. Als "patidors runners" Paco Boscá, per ser un picat; Cristina Martínez, per ser tan gran; Mónica; Pablo Navarro i Carlos López, companys també en moltes aventures. Als companys d'armorçar Tania, Estefanía, Laura, Alex i Urbano; a la gent de fotoquímica, Virginie, Jana, Sergio, "Dandy" Jerome, Sara, Pedro Atienzar i Pedro "Canijo"; i a molta gent, Santi; Ernest; Maria Mifsud; Silvio; Alejandro; Jonhy; Natalia; Isi; Antonio Chica; Bogdan; Jorge... i a "tolomón" en general. També a gent de fóra que se coneix les històries ITQ com si estigueren dins, ja que hem compartit moltes "servessetes", especialment a Maria Benimeli, Elena Mansilla i Maria Meravall.A tots els meus amics de la Vall, que han estat i estaran sempr...

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Rietveld refinement of the zorite structure of ETS-4 molecular sieves

Cited by 93 publications

References 8 publications

Stacking disorders in zeolites and open-frameworks – structure elucidation and analysis by electron crystallography and X-ray diffraction

Stacking disorders in zeolites and open-frameworks – structure elucidation and analysis by electron crystallography and X-ray diffraction

A microporous titanosilicate for selective killing of HeLa cancer cells

Síntesis de nuevos materiales microporosos mediante técnicas de alta capacidad ("High-Throughput").

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