Template-Free Synthesis of Zeolite Ferrierite and Characterization of its Acid Sites

Rakoczy, Rainer A.; Breuninger, Marcus; Hunger, Michael; Traa, Yvonne; Weitkamp, Jens

doi:10.1002/1521-4125(200203)25:3<273::aid-ceat273>3.0.co;2-4

Cited by 27 publications

(12 citation statements)

References 1 publication

(1 reference statement)

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“…The role of organic template on phase transformation process of Y zeolite to zeolite P and analcime was reported in our previous work [11]. Recently, due to the poisonous effects and high expenses of organic templates for synthesis of zeolite, the template free synthesis of zeolites has been frequently investigated and whenever it comes to the commercial-scale production of zeolites; there is a high incentive for template free syntheses, both for ecological and economical reasons [12,13]. In this study, the synthesis of template free zeolite P and its phase transformation to two types of high crystalline zeolites Y and analcime with changing crystallization temperature (80-160 ∘ C) and additionally the effect of different Si/Al ratios and crystallization times (40-60 h) were investigated.…”

Section: Introductionmentioning

confidence: 75%

Phase Transformation of Zeolite P to Y and Analcime Zeolites due to Changing the Time and Temperature

Azizi

Daghigh

Abrishamkar

2013

Journal of Spectroscopy

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In the present study, the synthesis of template free zeolite P under hydrothermal condition was investigated. The effects of parameters such as Si/Al ratios (3–45), crystallization temperatures (80–160°C), and cry (40–60 h) on the synthesis of zeolite P were studied. The phase transformation of zeolite P to two types of high crystallinity Y and analcime zeolites due to change of temperature was observed. The effect of temperature on the achievement of two different zeolite types (Y and analcime) with a constant initial synthetic composition under organic free synthesis of zeolite P was studied. The zeolitic products were characterized by X-ray diffraction, scanning electron microscopy, and IR spectroscopy techniques.

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Section: Introductionmentioning

confidence: 75%

Phase Transformation of Zeolite P to Y and Analcime Zeolites due to Changing the Time and Temperature

Azizi

Daghigh

Abrishamkar

2013

Journal of Spectroscopy

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“…This strongly suggests that the accessibility to active sites via the 8-and 10-member ring channels can be finely tuned by a proper choice and combination of structure directing agents. Rakoczy reported the organic template-free synthesis of ferrierite with sodium and potassium cations only [24]. The cooperative effect of sodium and potassium cations in the synthesis of ferrierite was investigated by Suzuki et al [25].…”

Section: Introductionmentioning

confidence: 99%

In situ and post-synthesis control of physicochemical properties of FER-type crystals

Chen

Todorova

Vimont

et al. 2014

Microporous and Mesoporous Materials

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“…Thus, organic‐SDA‐free synthesis of zeolites has attracted much attention, because such an approach can not only decrease the number of production steps and associated costs but can also contribute to environmentally benign synthesis of advanced materials 11. 12 However, only a few industrially important zeolites, such as A, X, Y, mordenite, ZSM‐5,13 ferrierite,14 ECR‐1,15 and ZSM‐34,16 can be synthesized without using organic SDAs. Very recently, Xiao and co‐workers succeeded in the synthesis of beta zeolite by the addition of calcined beta seeds to the starting aluminosilicate gel in the absence of organic SDAs 17.…”

Section: The Results Of the Mto Reactions For A Reaction Time Of 90 Mmentioning

confidence: 99%

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-5,7,7trimethylazoniumbicyclo[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 re...

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Template-Free Synthesis of Zeolite Ferrierite and Characterization of its Acid Sites

Cited by 27 publications

References 1 publication

Phase Transformation of Zeolite P to Y and Analcime Zeolites due to Changing the Time and Temperature

Phase Transformation of Zeolite P to Y and Analcime Zeolites due to Changing the Time and Temperature

In situ and post-synthesis control of physicochemical properties of FER-type crystals

Diversification of RTH‐Type Zeolite and Its Catalytic Application

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