Nanocrystalline ZSM-5: A catalyst with high activity and selectivity for epoxide rearrangement reactions

Serrano, David; Grieken, Rafael van; Melero, Juan A.; Garcı́a, Alicia; Vargas, Carolina

doi:10.1016/j.molcata.2009.11.009

Cited by 28 publications

(17 citation statements)

References 23 publications

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“…The mesoporous aggregates of ZSM-5 nanocrystals under 10 nm in size have a striking similarity with the ZSM-5 zeolite aggregates obtained by Serrano et al [8]. Larger size zeolites synthesized by the authors also lack mesoporosity and their aggregates have irregular shape.…”

Section: Transmission Electron Microscopysupporting

confidence: 81%

“…The decrease of particle size results in higher mesopore volume and the shift of the average pore diameter toward smaller sizes. Wider size distribution of mesopores can be attributed to the fact that they are formed by stacked nanocrystals rather than mesopore structure directing agent, such as phenylaminopropyltrimethoxysilane (PHAPTMS) used by Serrano et al [8]. The use of PHAPTMS allowed the authors to synthesize mesoporous zeolite aggregates with narrowly distributed pores 2-4 nm in diameter.…”

Section: Surface Area and Pore Volume Characteristicsmentioning

confidence: 99%

“…Several groups have compared the catalytic activity of nanocrystalline ZSM-5 to conventional micron-sized crystals [8][9][10]. Nanocrystalline ZSM-5 zeolites with particle sizes ranging from 20 to 50 nm were compared to microcrystalline ZSM-5 with respect to catalytic activity in epoxide rearrangement reactions [8]. The authors found that the nanocrystalline ZSM-5 zeolites had a significantly higher conversion rate and selectivity towards the desired products than the micron-sized zeolite.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of hierarchical nanocrystalline ZSM-5 with controlled particle size and mesoporosity

Петушков¹,

Yoon²,

Larsen³

2011

Microporous and Mesoporous Materials

139

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a b s t r a c tDevelopment of new zeolite based materials is essential for a variety of applications in catalysis, separations, and medicine. Increasing the specific surface area and decreasing the micropore diffusion pathlength in zeolites are important factors for improving the performance of zeolites in catalytic applications and these factors can be optimized by decreasing the zeolite particle size. Creation of a hierarchical zeolite material that possesses both micro-and mesopores with very large surface areas and improved mass transport properties is an effective solution. In this study, a facile approach to a one step synthesis of nanocrystalline ZSM-5 zeolite from a single template system in 12-24 h at 140°C and with high yield is presented. ZSM-5 zeolite crystals as small as 6 nm which form mesoporous aggregates of approximately 200 nm in diameter were synthesized using this method. The mesopore volume and size distribution showed a dependence on particle size such that smaller particles lead to higher mesopore volumes and narrower pore size distributions. The size of individual crystals, as well as mesopore surface area and pore volume can be controlled by adjusting the pH of the reaction mixture, as well as the hydrothermal treatment temperature and duration.

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Section: Transmission Electron Microscopysupporting

confidence: 81%

Section: Surface Area and Pore Volume Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of hierarchical nanocrystalline ZSM-5 with controlled particle size and mesoporosity

Петушков¹,

Yoon²,

Larsen³

2011

Microporous and Mesoporous Materials

139

View full text Add to dashboard Cite

show abstract

“…These large external active sites can be obtained by the reduction of the sample crystal size. In another investigation (Serrano et al 2010), it was found that, in epoxide rearrangement reactions, the nanocrystalline ZSM-5 showed a higher epoxide conversion compared to the microsized ZSM-5. The studies of Viswanadham et al (2009) also indicated that the nanosized ZSM-5 showed better activity (69% conversion) than the normal ZSM-5 in the esterification of cyclohexanol with the acetic acid process.…”

Section: Introductionmentioning

confidence: 95%

“…Reducing the ZSM-5 zeolite particle size leads to a shorter diffusion path of molecules and a less mass transfer resistance (Nagamatsu et al 1992, Yamamura et al 1994, Tosheva and Valtchev 2005, Majano et al 2009). Moreover, crystal size reduction enhances the catalytic activity of zeolites in various reactions, such as epoxide rearrangement reactions, the esterification of cyclohexanol with acetic acid, and the methanol to propylene (MTP) reaction (Firoozi et al 2009, Viswanadham et al 2009, Serrano et al 2010, Xue et al 2012a. For instance, in the ethylene oligomerization process, the external surface area and active sites that exist both in pores and on the external surface have a significant impact on the catalytic lifetime.…”

Section: Introductionmentioning

confidence: 99%

Effects of the different synthetic parameters on the crystallinity and crystal size of nanosized ZSM-5 zeolite

Alipour¹,

Halladj²,

Askari³

2014

Reviews in Chemical Engineering

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Effects of the different synthetic parameters on the crystallinity and crystal size of nanosized ZSM-5 zeoliteAbstract: This review aims at investigating the effect of the different synthetic parameters on the crystallinity and crystal size of nanosized ZSM-5 zeolite. The influence of the different parameters, such as the material of the synthesis source, the material ratio to each other, crystallization time and temperature, aging time and temperature, microwave treatment, seeding, and sonication, on the size of the final product is studied and the reason for each phenomenon is explained.

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Active sites and coke on aluminum sulfate for the rearrangement of propylene oxide

Zhang

Liang

Zhu

et al. 2020

Asia-Pacific J Chem Eng

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A solid acid catalyst aluminum sulfate was prepared and showed good performance for the propylene oxide rearrangement reaction. The selective adsorption of propylene oxide at different acid sites and the amount of acid sites on the catalyst was studied by the pyridine infrared. The results indicated that the rearrangement of propylene oxide on aluminum sulfate is catalyzed by Lewis acid sites. The rearrangement behavior of propylene oxide on the Lewis acid sites was then studied by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and a mechanism was proposed. Fourier transform infrared spectroscopy results showed that the catalyst deactivation is mainly due to the decrease of active sites caused by the coverage of coke, so the coke decomposition was studied in order to regenerate the catalyst. The coke decomposition at different temperatures and atmospheres was studied by thermogravimetry–derivative thermogravimetry and in situ DRIFTS, and the results showed that some of the coke on the catalyst is hydrocarbon such as alkanes and olefins that decomposes at lower temperature and the other is aged coke or the graphite‐like carbon that decomposes at higher temperature, and the higher the oxygen content and temperature, the easier to remove the coke.

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Nanocrystalline ZSM-5: A catalyst with high activity and selectivity for epoxide rearrangement reactions

Cited by 28 publications

References 23 publications

Synthesis of hierarchical nanocrystalline ZSM-5 with controlled particle size and mesoporosity

Synthesis of hierarchical nanocrystalline ZSM-5 with controlled particle size and mesoporosity

Effects of the different synthetic parameters on the crystallinity and crystal size of nanosized ZSM-5 zeolite

Active sites and coke on aluminum sulfate for the rearrangement of propylene oxide

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