Core–shell structured zeolite–zeolite composites comprising Y zeolite cores and nano-β zeolite shells: Synthesis and application in hydrocracking of VGO oil

Zhao, Qian; Qin, Bo; Zheng, Jiajun; Du, Yong; Sun, Wei; Ling, Fengxiang; Zhang, Xiwen; Li, Ruifeng

doi:10.1016/j.cej.2014.07.056

Cited by 65 publications

(24 citation statements)

References 73 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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“…The combination of pore texture and acidity of catalytic materials plays an important role in the performance of the catalysts, such as hydrocracking conversion of liquid oil fractions [39][40][41]. In this work, the two catalysts were evaluated in a pilot test, and catalytic performances of the Cat-PMB-0 and Cat-PMB-P in VGO hydrocracking were carried out on a standard micro-activity test unit (MAT).…”

Section: Resultsmentioning

confidence: 99%

Practical Application of Hierarchical Beta Zeolite in a Vacuum Gas Oil Hydrocracking Catalyst

Zhang

Qin

et al. 2020

Chem Eng & Technol

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A hierarchical Beta zeolite has been successfully mass-prepared hydrothermally and dynamically in a pilot-scale autoclave by an economical and simple process with low-cost raw materials. The characterization results indicated that the pilotscale hierarchical Beta zeolite has the same textural, structural, and acidic properties like the bench-scale sample. Moreover, the catalyst composed of the pilot-scale hierarchical H-Beta zeolite showed higher activity and selectivity to the middle distillate than that containing microporous Beta zeolite in catalytic hydrocracking of vacuum gas oil (VGO) evaluated by an industrial pilot installation in running of 3000 h, due to the increased accessibility and the reduction of diffusion constraint of large molecules to acid sites in the Beta zeolite framework.

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“…This type of hierarchy is desirable in some applications (see Section , vide infra). Combining different catalytically active elements in the form of a core@shell architecture is the best technique to create more efficient composite catalysts, which may present shape‐selective properties . Direct nucleation and growth of a new crystalline phase over the external surface of another zeolitic support have also permitted the formation of all‐zeolite core@shell materials .…”

Section: Synthesis Of Core@zeolite Materialsmentioning

confidence: 99%

“…Due to the interstitial pores formed between deposited nanocrystals, such an assembly of nanozeolites around a template produces core@shell or hollow zeolitic spheres with meso‐microporous shells. This hierarchical shell porosity can be of interest for some applications . If one is seeking for an entirely microporous hollow zeolite, it is however important to note that this technique usually needs to be combined or merged with the seeded growth methodology, as described earlier in this review.…”

Section: Synthesis Of Hollow and Yolk–shell Zeolitic Materialsmentioning

confidence: 99%

Synthesis of Engineered Zeolitic Materials: From Classical Zeolites to Hierarchical Core–Shell Materials

2018

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The term "engineered zeolitic materials" refers to a class of materials with a rationally designed pore system and active-sites distribution. They are primarily made of crystalline microporous zeolites as the main building blocks, which can be accompanied by other secondary components to form composite materials. These materials are of potential importance in many industrial fields like catalysis or selective adsorption. Herein, critical aspects related to the synthesis and modification of such materials are discussed. The first section provides a short introduction on classical zeolite structures and properties, and their conventional synthesis methods. Then, the motivating rationale behind the growing demand for structural alteration of these zeolitic materials is discussed, with an emphasis on the ongoing struggles regarding mass-transfer issues. The state-of-the-art techniques that are currently available for overcoming these hurdles are reviewed. Following this, the focus is set on core-shell composites as one of the promising pathways toward the creation of a new generation of highly versatile and efficient engineered zeolitic substances. The synthesis approaches developed thus far to make zeolitic core-shell materials and their analogues, yolk-shell, and hollow materials, are also examined and summarized. Finally, the last section concisely reviews the performance of novel core-shell, yolk-shell, and hollow zeolitic materials for some important industrial applications.

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Core–shell structured zeolite–zeolite composites comprising Y zeolite cores and nano-β zeolite shells: Synthesis and application in hydrocracking of VGO oil

Cited by 65 publications

References 73 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

Practical Application of Hierarchical Beta Zeolite in a Vacuum Gas Oil Hydrocracking Catalyst

Synthesis of Engineered Zeolitic Materials: From Classical Zeolites to Hierarchical Core–Shell Materials

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