Structural features of binary microporous zeolite composite Y-Beta and its hydrocracking performance

Zhang, Xiwen; Guo, Qun; Qin, Bo; Zhang, Zhizhi; Ling, Fengxiang; Sun, Wei; Li, Ruifeng

doi:10.1016/j.cattod.2009.11.005

Cited by 55 publications

(31 citation statements)

References 26 publications

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“…Also, the bands around 1090 and 447 cm -1 are assigned to the anti-symmetric stretching vibrations and the O-T (Si or Al) bending vibrations, respectively. The vibration bands between 1000 and 1100 cm -1 are often used to identify the Si/Al ratio of the framework [32,33]. The anti-symmetric stretching vibrations bands shift from 1094 cm -1 of TZSM-5 to 1089 cm -1 of NZSM-5, suggesting that the former may have a relative higher Si/Al ratio than the latter.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

Synthesis of Wool-Ball-Like ZSM-5 with Enlarged External Surfaces and Improved Diffusion: A Potential Highly-Efficient FCC Catalyst Component for Elevating Pre-cracking of Large Molecules and Catalytic Longevity

et al. 2016

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A hierarchical ZSM-5 zeolite composed of nanosized MFI zeolite crystals was synthesized without using secondary template by a traditional hydrothermal procedure. The as-synthesized hierarchical ZSM-5 and a reference catalyst were both characterized by XRD, SEM, FT-IR, in situ infrared (IR) spectrometry of pyridine, NH 3 -TPD, N 2 adsorption-desorption, intelligent gravimetric analyzer, and by thermogravimetry analyses. After examining and comparing the results, it is discovered that the hierarchical ZSM-5 catalyst displays excellent catalytic performance with an improved conversion of isopropylbenzene and a longer catalytic life because of its dramatically enlarged external surfaces. The results also display that the shortened diffusion path length contributes to enhancing the stability of the hierarchical catalyst by depressing the coking deposit during the catalytic cracking of n-octane.Graphical Abstract A wool-ball-like zeolite composed of nano-sized MFI crystals was synthesized without a secondary template by the traditional hydrothermal procedure. Nanocrystallization of crystal particles in the hierarchical ZSM-5 zeolite gives the catalyst an improved diffusion and a dramatically enhanced external surface which contributes to elevating pre-cracking of large molecules and catalytic longevity, and to offering a potential and high-efficiency FCC catalyst component.

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Section: Synthesis and Characterizationmentioning

confidence: 99%

Synthesis of Wool-Ball-Like ZSM-5 with Enlarged External Surfaces and Improved Diffusion: A Potential Highly-Efficient FCC Catalyst Component for Elevating Pre-cracking of Large Molecules and Catalytic Longevity

et al. 2016

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“…It can be seen from Figs. a and b, that the synthesized sample shows the presence of typical faujasite particles . It can be observed from the Figs.…”

Section: Resultsmentioning

confidence: 71%

“…Samples annealed at 300°C shows that this is the optimum temperature since further growth of the crystallite was not seen above this temperature. With the prolonged treatment time, the intercrystalline void spaces present between the small‐sized NaY zeolite particles have shrunk in size, and the NaY particles in the outer shell adheres to the substrate . This results in a relatively smooth NaY zeolite layer.…”

Section: Resultsmentioning

confidence: 99%

Seed‐Free Synthesis and Characterization of Zeolite Faujasite Aluminosilicate Coating on α‐Alumina Supports

Sivakumar¹,

Agilan²,

Muthukumarasamy³

et al. 2016

Int J Applied Ceramic Tech

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NaY zeolite was synthesized by a simple sol–gel technique. NaY zeolite membrane was formed on the alumina substrate using optimized solution composition and synthesis conditions. The formation of the NaY zeolite was ascertained by X‐ray powder diffraction, which showed that the crystallinity improved with annealing. The high‐resolution transmission electron microscopy images of samples annealed at 300°C showed the formation of cubic structure corresponding to NaY zeolite. Brunauer–Emmett–Teller analysis revealed that the synthesized zeolite is a well crystallized NaY zeolite. The SEM images revealed the formation of fine structure NaY zeolite membrane on α‐alumina substrate.

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“…19 In addition, some of the passivating agents may also bring side reaction. 32,33 Overgrown [34][35][36][37][38][39] or intergrown 40 with a high-silica molecular sieve is also used to better the external surface acidity of zeolites catalysts. For example, MCM-41/FAU composite materials, which zeolite faujasite overgrown with a thin layer of mesoporous MCM-41, showed a higher conversion of heavy products compared to USY when tested in the catalytic cracking of vacuum gasoil 41 due to the decreased external acidity density because of the formation of a thin layer of high-silica MCM-41.…”

Section: Introductionmentioning

confidence: 99%

Structural features of core–shell zeolite–zeolite composite and its performance for methanol conversion into gasoline and diesel

Zheng

Sun

et al. 2016

J. Mater. Res.

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Zeolite-zeolite composite composed of alumina-rich hierarchically porous ZSM-5 cores and high-silicon MFI shells was prepared by a hydrothermal synthesis procedure, in which a commercial ZSM-5 zeolite with a SiO 2 /Al 2 O 3 of 36 was treated by an alkaline solution and then used as a supporter for epitaxial growth of a polycrystalline Silicalite-1 zeolite shell (denoted as MMZsa). Acid sites associated with framework Al on exterior surfaces of ZSM-5 zeolite cores are therefore passivated in different degrees by the epitaxial MFI zeolite shell. The structural, crystalline, and textural properties of the as-synthesized samples were characterized by x-ray powder diffraction (XRD), energy-dispersive x-ray spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), N 2 adsorption-desorption, in situ IR spectra of pyridine and NH 3 -TPD. Aluminum species were observed to transfer from the alumina-rich cores to the high-silica shells. The adjustable thickness and SiO 2 /Al 2 O 3 ratio of the shell offer the as-synthesized composite a potential and high-efficiency catalyst for methanol conversion into gasoline and diesel. As compared with the commercial ZSM-5 zeolite, the composite catalyst exhibits excellent catalytic performances with a longer catalytic life as well as a higher conversion and a slightly higher yield of diesel oil.

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Structural features of binary microporous zeolite composite Y-Beta and its hydrocracking performance

Cited by 55 publications

References 26 publications

Synthesis of Wool-Ball-Like ZSM-5 with Enlarged External Surfaces and Improved Diffusion: A Potential Highly-Efficient FCC Catalyst Component for Elevating Pre-cracking of Large Molecules and Catalytic Longevity

Synthesis of Wool-Ball-Like ZSM-5 with Enlarged External Surfaces and Improved Diffusion: A Potential Highly-Efficient FCC Catalyst Component for Elevating Pre-cracking of Large Molecules and Catalytic Longevity

Seed‐Free Synthesis and Characterization of Zeolite Faujasite Aluminosilicate Coating on α‐Alumina Supports

Structural features of core–shell zeolite–zeolite composite and its performance for methanol conversion into gasoline and diesel

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