Synthesis and Catalytic Behavior of Ferrierite Zeolite Nanoneedles

Lee, Yoorim; Park, Min Bum; Kim, Pyung Soon; Vicente, Aurélie; Fernandéz, Christian; Nam, In−Sik; Hong, Suk Bong

doi:10.1021/cs400025s

Cited by 60 publications

(55 citation statements)

References 26 publications

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“…That is, the catalysts synthesized in the presence of TMAOH had broader XRD peaks which are oen seen with nanocrystalline materials. 16,29 The nature of these catalysts was further evident in their SEM images. Fig.…”

Section: Characterization Of Different Catalystsmentioning

confidence: 92%

“…This hierarchical ferrierite showed greatly improved catalytic activities for the pyrolysis of low-density polyethylene and benzylation of toluene with benzyl chloride. Pinar, 15 Lee, 16 and Yang 17,18 have all reported needle-like or rod-like ferrierite, and found that the ferrierite has a higher selectivity and better stability than the commercial ferrierite for the skeletal isomerization of n-butene. In addition, Hu 19 obtained small-sized ferrierite through an aging step, and found that this ferrierite showed higher activity and isobutene yield than large-sized ferrierite.…”

Section: 7mentioning

confidence: 99%

“…20,21 The monomolecular mechanism occurs on Brønsted acid sites through a protonated cyclopropyl cation, which can be broken down to a primary carbenium ion, and then rearrange to form isobutene. 16,22,23 Even though the monomolecular mechanism can explain the high isobutene selectivity, some researchers do not support this view because this mechanism must go through a primary carbenium ion, which is highly energetically and thermodynamically unfavorable. Guisnet proposed a pseudomonomolecular mechanism, in which formation of the primary carbenium ion is avoided.…”

Section: 7mentioning

confidence: 99%

“…The 27 Al MAS NMR spectra were analyzed at a frequency of 78. 16 MHz with a pulse of 1.8 ms and a recycling delay of 0.5 s, and by spinning the samples at a frequency of 10.0 MHz. X-ray uorescence (XRF) was carried out on a Bruker S4 Pioneer to analyze the sodium content and Si/Al ratio.…”

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confidence: 99%

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Designing ferrierite-based catalysts with improved properties for skeletal isomerization of n-butene to isobutene

et al. 2017

RSC Adv.

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The crystal morphology and size of ferrierite catalysts were controlled by a suite of crystallization methods and structure-directing agents. In particular, nano-sized ferrierite could be obtained by using tetramethylammonium hydroxide and pyrrolidine as double structure-directing agents under dynamic crystallization. The catalysts were analysed by XRD, SEM, N 2 adsorption-desorption, NMR, XRF, NH 3 -TPD, Py-IR, and TGA, and the characteristics were correlated with their catalytic performance in the skeletal isomerization of n-butene. The results clearly indicated that all the catalysts have a similar crystallinity, Si/Al ratio, and total number of acid sites, while a decrease in their crystal size leads to more pore mouth acid sites. The nano-sized ferrierite showed better stability and higher activity, which were related to their crystal morphology, size, and pore mouth acid. In addition, we further confirmed that high isobutene selectivity can be produced by monomolecular reaction.

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Section: Characterization Of Different Catalystsmentioning

confidence: 92%

Section: 7mentioning

confidence: 99%

Section: 7mentioning

confidence: 99%

mentioning

confidence: 99%

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Designing ferrierite-based catalysts with improved properties for skeletal isomerization of n-butene to isobutene

et al. 2017

RSC Adv.

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“…In contrast, only few works have focused on the direct or in-situ synthesis of hierarchical and nanosized FER zeolites [37,38]. Recently, FER with a nanoneedle M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 4 shape was successfully prepared by using choline and Na + as SDA [37].…”

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Direct synthesis of hierarchical ferrierite nanosheet assemblies via an organosilane template approach and determination of their catalytic activity

Wuamprakhon

Wattanakit

Warakulwit

et al. 2016

Microporous and Mesoporous Materials

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EU‐12: A Small‐Pore, High‐Silica Zeolite Containing Sinusoidal Eight‐Ring Channels

et al. 2016

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Zeolite EU-12, the framework structure of whichhas remained unsolved during the past 30 years,i ss ynthesized at as pecific SiO 2 /Al 2 O 3 ratio using choline as an organic structure-directing agent, with both Na + and Rb + ions present. Synchrotron powder X-ray diffraction and Rietveld analyses reveal that the EU-12 structure has at wo-dimensional 8-ring channel system. Among the two distinct 8-ring (4.6 2.8 and 5.0 2.7 ) channels along caxis,the smaller one interconnects with the sinusoidal 8-ring (4.8 3.3 ) channel along aaxis. The other large one is simply linked up with the sinusoidal channel by sharing 8-rings (4.8 2.6 ) in the ac plane.T he proton form of EU-12 was found to show ac onsiderably higher ethene selectivity in the low-temperature dehydration of ethanol than H-mordenite,t he best catalyst for this reaction.While zeolites and related crystalline materials have awide variety of commercial applications in catalysis,ion exchange, and gas adsorption and separation, their performance is inherently associated with the shape,size,accessibility and/or dimensionality of the crystallographically well-defined cavities and channels.O ver the past several decades,t herefore, extensive efforts have been devoted to the synthesis of zeolites with novel framework topologies using numerous different organic amines and alkylammonium ions as organic structure-directing agents (SDAs). [1] Among the organic SDAs studied thus far,t he choline (Ch + ,(2-hydroxyethyl)trimethylammonium) ion is interesting because it crystallizes ferrierite (framework type FER) nanoneedles and SSZ-13 (CHA), [2] with Na + present, mainly depending on the Na 2 O/SiO 2 ratio in the synthesis mixture. Also,zeolite UZM-22 (MEI) containing 3-rings as part of the structure is the phase formed from the strontium aluminosilicate synthesis mixture containing Ch + . [3] In particular,C h + can direct the synthesis of anew crystalline inorganic-organic material, that is,the framework-bound organic SDA-containing molecular sieve denoted ECR-40C. [4] These results have prompted us to systematically investigate the effects of inorganic gel chemistry on the phase selectivity in this cheap organic SDA-mediated synthesis of zeolites.H ere we report the synthesis of zeolite EU-12 in the mixed Ch + -Na + -Rb + SDAsystem and its structure determined by synchrotron powder X-ray diffraction (XRD) and Rietveld analyses.EU-12 was first reported by Araya and Lowe in 1986, [5] but its structure has remained unknown until now.Wealso show that the proton form of this zeolite is quite selective to ethene formation in the low-temperature dehydration of ethanol. Table 1l ists the representative products obtained using Ch + as an organic SDAf rom aluminosilicate gels with different oxide compositions,w hich were heated under rotation (60 rpm) at 150 8 8Cf or 7days.T hese data reveal that the crystallization of EU-12 is very sensitive to both Al and Rb contents in the synthesis mixture.W hent he Rb 2 O/ (Rb 2 O + Na 2 O) ratio in the synthesis mixture was fixed to 0.7, ...

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Synthesis and Catalytic Behavior of Ferrierite Zeolite Nanoneedles

Cited by 60 publications

References 26 publications

Designing ferrierite-based catalysts with improved properties for skeletal isomerization of n-butene to isobutene

Designing ferrierite-based catalysts with improved properties for skeletal isomerization of n-butene to isobutene

Direct synthesis of hierarchical ferrierite nanosheet assemblies via an organosilane template approach and determination of their catalytic activity

EU‐12: A Small‐Pore, High‐Silica Zeolite Containing Sinusoidal Eight‐Ring Channels

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