Synthesis and crystal structure of the new borosilicate zeolite RUB-13

Vortmann, S.; Marler, Β.; Gies, Hermann; Daniels, Peter J. L.

doi:10.1016/0927-6513(94)00090-i

Cited by 76 publications

(60 citation statements)

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“…The molar composition of the reaction mixture was 1.0 SiO 2 :0.25 H 3 BO 3 :0.005 Al 2 -(SO 3 ) 3 :0.2 NaOH:0.5 PMP:2.0 EDA:100 H 2 O. Then, 2 wt % of the calcined [B]-RUB-13 (Si/B = 23 in product), which had been prepared according to the original recipe in advance, [8] was added to the mixture as a seed. Thus prepared mother gel was crystallized in an oven at 170 8C for 7 days with tumbling at 20 rpm.…”

Section: Methodsmentioning

confidence: 99%

“…[8] In a typical synthesis of [Al,B]-RUB-13, boric acid (Wako) and aluminum sulfate (Wako) were added to an aqueous solution containing NaOH (Wako) with stirring. Fumed silica (Cab-O-Sil M5, Cabot) was added to the mixture.…”

Section: Methodsmentioning

confidence: 99%

“…This borosilicate (designated as [B]-RUB-13) can be synthesized by using a mixture of 1,2,2,6,6-pentamethylpiperidine (PMP) and ethylenediamine (EDA) as organic structure-directing agents (SDAs). [7,8] The other RTH-type zeolite is SSZ-50, which is an aluminosilicate zeolite and will be useful as a solid-acid catalyst. Unfortunately, the synthesis of SSZ-50 requires a special organic SDA, N-ethyl-N-methyl-5,7,7-trimethylazoniumbicyclo[4.1.1]octane cation, [9] which is not commercially available and is obtained through an elaborate multistep organic synthesis.…”

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Diversification of RTH‐Type Zeolite and Its Catalytic Application

et al. 2009

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Zeolites have been utilized in many industrial technologies, including gas adsorption, ion exchange, separation, and catalysis for their unique porosity and high surface area. Recently, eight-membered-ring (8MR) zeolites and zeolitetype (zeotype) materials have attracted much attention, as their small pores are expected to be beneficial for selective catalysis. For example, CHA-zeotype materials such as SSZ-13 and SAPO-34 showed excellent catalytic activity for the methanol-to-olefins (MTO) reaction to provide ethylene and propylene, which are important chemicals for the polymer industry. [1][2][3][4][5] The activity of these catalysts, however, is drastically decreased owing to the deposition of coke derived from polymethylbenzene and aromatic polycyclic compounds, which are formed in a cavity in the zeolite.[6]The RTH-type zeolite, which was discovered in 1995, consists of RTH cages with 8MR openings and has twodimensional channels with aperture size of 0.41 0.38 nm and 0.56 0.25 nm, which run parallel to the a axis and the c axis, respectively. Since its discovery, this zeolite has been expected to show unique properties in the fields of catalysis and adsorption because of its unique structure. Note that the free volume of RTH-type zeolite for the MTO reaction (408 3 ) is smaller than that of CHA-type zeolites (415 3 ). [7] Considering the differences in pore dimension, size, and the free volume between RTH-and CHA-type zeolites, if the RTHtype zeolite is applied as a catalyst for the MTO reaction, the deposition of coke could be suppressed so that the catalytic performances could be improved. Unfortunately, only two examples on the RTH-type zeolites have been reported to date. One is a borosilicate zeolite, RUB-13, which is the first example of the RTH-type zeolite. This borosilicate (designated as [B]-RUB-13) can be synthesized by using a mixture of 1,2,2,6,6-pentamethylpiperidine (PMP) and ethylenediamine (EDA) as organic structure-directing agents (SDAs). [7,8] The other RTH-type zeolite is SSZ-50, which is an aluminosilicate zeolite and will be useful as a solid-acid catalyst. Unfortunately, the synthesis of SSZ-50 requires a special organic SDA, N-ethyl-N-methyl-5,7,7-trimethylazoniumbicyclo[4.1.1]octane cation, [9] which is not commercially available and is obtained through an elaborate multistep organic synthesis. The synthesis of SSZ-50 has not been remarkably advanced to date. Thus, the compositional variations in the RTH-type zeolites and their applications have been limited; especially, the incorporation of heteroatoms, the use of alternative organic SDAs, and the catalytic applications have not been investigated. Therefore, we have focused on the diversification of the RTH-type zeolites. Herein, we report the incorporation of Al atoms into [B]-RUB-13 synthesized with a mixture of PMP and EDA as SDAs. Furthermore, an organic-SDA-free synthesis route to the RTH-type zeolites has been developed. Remarkable catalytic activities of newly developed heteroatom-containing RTH-type zeolites for the MTO rea...

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Diversification of RTH‐Type Zeolite and Its Catalytic Application

et al. 2009

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“…RUB-3 and RUB-4 belong to the decasil family, where RUB-3 represents an ordered polytype while RUB-4 is a disordered material [53,54]. SSZ-36 is an intergrowth of ITQ-3 (ITE) [79] and RUB-13 (RTH) [56,57]. SSZ-54 is an intergrowth of SSZ-32 (MTT) and ZSM-22 (TON) [58].…”

Section: Itq-22 (Iww)/itq-38mentioning

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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“…RTH is a two-dimensional small pore zeolite, which contains large cavities in its structure, suggesting that this structure could be adequate for its application in methanol to olefin reaction. This material was previously synthesized using a pentamethylpiperidine [216] or an azoniumbicyclo cation [217] as organic structure directing agents. Yokoi et al not only achieved the direct synthesis of the aluminium RTH zeolite (named Al-TTZ-1) under organic free conditions, but also remarkable catalytic results were reported for this new material in the methanol to olefin reaction.…”

Section: Direct Synthesis Of Osda-free Zeolitesmentioning

confidence: 99%

Direct Synthesis of Functional Zeolitic Materials

Moliner

2012

ISRN Materials Science

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Recently, the direct synthesis of zeolitic materials has received much attention because several well-defined functionalities have been introduced in those materials by "one-pot" methodologies. The rationalization of the physics and chemistry of the processes involved in the zeolite growth has allowed the direct preparation of different functional molecular sieves with unique properties and potential applicability in industry. In the present paper, the "one-pot" preparations of metal-containing zeolites (both in framework and extra-framework positions), hybrid organic-inorganic molecular sieves, hierarchical microporous mesoporous zeotypes, nanosheets, nanozeolites, or template-free molecular sieves are intensively evaluated.

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Synthesis and crystal structure of the new borosilicate zeolite RUB-13

Cited by 76 publications

References 4 publications

Diversification of RTH‐Type Zeolite and Its Catalytic Application

Diversification of RTH‐Type Zeolite and Its Catalytic Application

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

Direct Synthesis of Functional Zeolitic Materials

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