Facile control of nanosized ZSM-22 crystals using dynamic crystallization technique

Jamil, Anas K.; Muraza, Oki

doi:10.1016/j.micromeso.2016.02.005

Cited by 24 publications

(25 citation statements)

References 26 publications

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“…Under these conditions, a reduction in K 2 O content to one‐third of its original composition initially generated an amorphous product, but when the mixture was heated for one month we obtained pure MEL (Table S1). We did not observe the formation of TON under any static condition; however, prior studies do report that TON crystallization is possible under such conditions using alternative silica sources and/or different OSDAs …”

Section: Resultscontrasting

confidence: 74%

“…We did not observe the formationo fT ON under any static condition;h owever, prior studies do report that TON crystallization is possible under such conditions using alternative silica sourcesa nd/or differentOSDAs. [19] We examined three additional synthesis parameters influencing TON formation:w ater content,s ilicon source,a nd aluminum source. Comparedt ot he nominal growth condition (e.g., sample N-0), we found that water content couldb er educed by as much as 56 %o fi ts original value and stilly ield MEL product (e.g.,s ample N-9 in Ta ble1 and N-22 in Table S1).…”

Section: Parametric Analysis Of Mel Synthesis Conditionsmentioning

confidence: 99%

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Optimized Synthesis of ZSM‐11 Catalysts using 1,8‐Diaminooctane as a Structure‐Directing Agent

Shen

et al. 2017

ChemPhysChem

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Developing new zeolite catalysts for (petro)chemical applications is nontrivial owing to challenges that include the identification of commercially-viable syntheses. The vast majority of syntheses require the use of an organic structure-directing agent (OSDA), which has economic and environmental shortcomings. In the search for alternative zeolites to common industrial catalysts, such as ZSM-5 (MFI), a promising candidate is ZSM-11 (MEL), a close structural analogue of MFI. ZSM-11 is comprised of 3-dimensional straight channels that have less diffusion limitations than MFI. Side-by-side comparisons of ZSM-11 and ZSM-5 catalysts reveal the former exhibits significantly longer time-on-stream lifetime in many reactions; however, there are several difficulties associated with the preparation of ZSM-11, which include the ability to identify inexpensive OSDAs that produce small crystals in high yield. Here, we examine ZSM-11 synthesis using 1,8-diaminooctane (DAO), which produces ZSM-11 crystals with sizes of ca. 300 nm. We demonstrate that the use of MEL seeds allows for an order of magnitude reduction in the quantity of DAO without sacrificing crystal purity or yield (>80 %). Catalytic tests using methanol to hydrocarbons as a representative reaction show that H-ZSM-11 lifetime and selectivity are similar for samples prepared with and without seeds. Collectively our findings highlight an efficient method to produce ZSM-11 as a potential alternative to ZSM-5 for catalytic applications.

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Section: Resultscontrasting

confidence: 74%

Section: Parametric Analysis Of Mel Synthesis Conditionsmentioning

confidence: 99%

Optimized Synthesis of ZSM‐11 Catalysts using 1,8‐Diaminooctane as a Structure‐Directing Agent

Shen

et al. 2017

ChemPhysChem

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“…K-ZSM-22 zeolites with Si/Al ratio in the synthesis mixture (nominal Si/Al ratio) of 46 were prepared according to the previous reports. , The Si/Al ratios in the synthesis solution were altered to 30, 80, and 100 by varying the amounts of aluminum sulfate octadecahydrate . The prepared samples (K-ZSM-22) were washed, calcined, and ion-exchanged with NH 4 NO 3 to form the protonated zeolites (H-ZSM-22) .…”

Section: Methodsmentioning

confidence: 99%

Hydrothermal Stability of One-Dimensional Pore ZSM-22 Zeolite in Hot Water

et al. 2016

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The hydrothermal stability of 1-D medium pore zeolites ZSM-22 with different nominal Si/Al ratios (30, 46, 80, and 100) was investigated in hot liquid water environments at different temperatures (100, 150, 200, and 250 °C) and different exposure times (6, 12, 36, 72, and 144 h). The changes in the zeolite structure, phase transformation, and textural properties were characterized by X-ray diffraction, scanning electron microscopy, 27Al and 29Si magic-angle spinning nuclear magnetic resonance, temperature-programmed desorption of ammonia, IR spectra, and X-ray fluorescence. After the treatment in a hot water environment, TON framework suffered from desilication (silicon extraction), phase transformation, and crystallinity change. The degree of desilication via siloxane hydrolysis is dependent on the treatment time and temperature. At high temperature (250 °C), severe desilication, textural properties degradation, and formation of extra-framework Al species (EFAL) were observed. This formed EFAL worked as a covering layer protecting the venerable Si bonds and mitigated further leaching of Si species from TON framework with time progress. On the contrary, selective removal of Si species at temperatures lower than 250 °C was observed without the appearance of EFAL.

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“…An ERI (Erionite) and a TON zeolite (ZSM-22) were prepared according to published procedures. [21] The ammonium form of the zeolites was converted to their protonic form by calcination at 773 K for 5 h, (ramp rate of 1 K min -1 under dry air flow). Table 1 summarizes an overview of all characterization results of the samples, which will be reported upon later in this work.…”

Section: Samplesmentioning

confidence: 99%

A highly selective FER-based catalyst to produce n-butenes from isobutanol

Daele

Minoux

Nesterenko

et al. 2021

Applied Catalysis B: Environmental

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Facile control of nanosized ZSM-22 crystals using dynamic crystallization technique

Cited by 24 publications

References 26 publications

Optimized Synthesis of ZSM‐11 Catalysts using 1,8‐Diaminooctane as a Structure‐Directing Agent

Optimized Synthesis of ZSM‐11 Catalysts using 1,8‐Diaminooctane as a Structure‐Directing Agent

Hydrothermal Stability of One-Dimensional Pore ZSM-22 Zeolite in Hot Water

A highly selective FER-based catalyst to produce n-butenes from isobutanol

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