Preparation of hierarchical β and Y zeolite-containing mesoporous silica–aluminas and their properties for catalytic cracking of n-dodecane

Ishihara, Atsushi; Inui, Kentarou; Hashimoto, Tadanori; Nasu, Hiroyuki

doi:10.1016/j.jcat.2012.07.027

Cited by 73 publications

(67 citation statements)

References 42 publications

(94 reference statements)

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“…Furthermore, the BJH surface areas of MA122-0-Y, MA122-1-Y and MA122-5-Y catalysts were very large and close to their BET surface areas, indicating that a large part of the pore structure of these catalysts consisted of mesopores. These N2 adsorption findings are consistent with those of β zeolite-containing catalysts 18) , which confirmed the presence of the hierarchical structure with micropores in the core and mesopores in the shell as mentioned above. Table 2 shows the NH3 adsorption and desorption and the conversion of VGO in catalytic cracking.…”

Section: Catalytic Cracking Of Vgo Using a Curiesupporting

confidence: 89%

“…Therefore, we expected that the Y zeolite crystals were effectively covered by TEOS at the initial stage of the preparation and that a hierarchical structure with microporous zeolite in the core and mesoporous silica or silica _ alumina in the shell was formed. Such a hierarchical structure has been confirmed for β zeolitecontaining catalysts by TEM 18) . Recently, many researchers have tried to make mesoporous materials around zeolite with the use of pore directing agents .…”

Section: Catalytic Cracking Of Vgo Using a Curiementioning

confidence: 61%

“…The amounts of NH3 adsorbed and desorbed for single Y zeolite were much smaller than the amount of Al contained in this zeolite. The dispersion of Al, the ratio of the amounts of NH3 adsorbed against the amounts of Al contained in this zeolite, was not so high as that for β zeolite (almost 100 %) 18) . The amount of NH3 desorption was in the range 2.8-4.9 10 -4 mol/g, which is approximately consistent with the increase in Al content, but decreased in MA122-25-Y.…”

Section: Catalytic Cracking Of Vgo Using a Curiementioning

confidence: 66%

“…Using CPP with that of n-Dodecane Using a Flow Reactor Catalytic cracking of VGO using CPP as presented here was compared with that of n-dodecane using the same catalysts containing Y zeolite and β zeolite in a flow reactor as reported recently 18) . The reaction conditions for the catalytic cracking of n-dodecane were as follows: 500 , catalyst 1 g, n-dodecane 1.3 mL/min, reaction time 80 s, fixed flow reactor with ID 8 mm; and N2 carrier gas was introduced for 30 min at 30 mL/ min after the addition of n-dodecane.…”

Section: Comparison Of Catalytic Cracking Of Vgomentioning

confidence: 99%

“…Furthermore, hierarchical Y zeolite-containing mesopo-rous silica _ aluminas could be prepared using malic acid (MA) 18), 19) . In these studies, a model compound, ndodecane, was used as a feed material.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Cracking of VGO by Hierarchical Y Zeolite-containing Mesoporous Silica–Alumina Catalysts Using Curie Point Pyrolyzer

Ishihara

Kimura

Hashimoto

et al. 2014

J. Jpn. Petrol. Inst.

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Hierarchical Y zeolite-containing mesoporous silica _ aluminas were prepared by the one pot sol-gel method using malic acid. Properties for the catalytic cracking of vacuum gas oil (VGO) were estimated using a Curie point pyrolyzer, to establish a novel and very simple estimation method for the catalytic cracking of VGO. Prepared catalysts showed higher conversions and selectivities for gasoline than zeolite single, indicating that yields of gasoline for zeolite-containing catalysts increased compared with that of zeolite single. Higher content of aluminum species in the catalysts resulted in decreased olefin/paraffin ratios and increased iso-/n-ratios (ratio of branched products to straight-chained ones), indicating that hydrogen transfer and isomerization were promoted by the addition of acid sites into the matrix. Catalysts with mesopores tended to form larger amounts of multibranched products, which are very important in modern petroleum refining. When the yields of gasoline, singlebranched products and multi-branched products were plotted against the conversion of VGO, the linear relationships were observed and the effect of kinds of zeolite was rather small, indicating that the activity and the selectivity were largely affected by the presence of matrices. Comparison of the yields of gasoline, single-branched products and multi-branched products at the same conversions showed that Y zeolite-containing catalysts always showed the highest yields and ZSM-5-containing catalysts showed the lowest yields although the differences were small. Pore size of the zeolite probably also affected the yields in the treatment of large molecules such as VGO. The present findings suggest that the appropriate combination of zeolite and matrix is the most important factor to obtain high catalytic activity and high yields of gasoline and branched products.

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Section: Catalytic Cracking Of Vgo Using a Curiesupporting

confidence: 89%

Section: Catalytic Cracking Of Vgo Using a Curiementioning

confidence: 61%

Section: Catalytic Cracking Of Vgo Using a Curiementioning

confidence: 66%

Section: Comparison Of Catalytic Cracking Of Vgomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Catalytic Cracking of VGO by Hierarchical Y Zeolite-containing Mesoporous Silica–Alumina Catalysts Using Curie Point Pyrolyzer

Ishihara

Kimura

Hashimoto

et al. 2014

J. Jpn. Petrol. Inst.

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Mesoporous Zeolites: Synthesis and Catalytic Applications

Xiao

2022

Functional Materials From Colloidal Self‐Assembly

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Spontaneous Pillaring of Pentasil Zeolites

et al. 2021

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Conventional methods to prepare hierarchical zeolites depend upon the use of organic structure‐directing agents and often require multiple synthesis steps with limited product yield and Brønsted acid concentration. Here, it is shown that the use of MEL‐ or MFI‐type zeolites as crystalline seeds induces the spontaneous formation of self‐pillared pentasil zeolites, thus avoiding the use of any organic or branching template for the crystallization of these hierarchical structures. The mechanism of formation is evaluated by time‐resolved electron microscopy to provide evidence for the heterogeneous nucleation and growth of sequentially branched nanosheets from amorphous precursors. The resulting hierarchical zeolites have large external surface area and high percentages of external acid sites, which markedly improves their catalytic performance in the Friedel–Crafts alkylation and methanol to hydrocarbons reactions. These findings highlight a facile, commercially viable synthesis method to reduce mass‐transport limitations and improve the performance of zeolite catalysts.

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Preparation of hierarchical β and Y zeolite-containing mesoporous silica–aluminas and their properties for catalytic cracking of n-dodecane

Cited by 73 publications

References 42 publications

Catalytic Cracking of VGO by Hierarchical Y Zeolite-containing Mesoporous Silica–Alumina Catalysts Using Curie Point Pyrolyzer

Catalytic Cracking of VGO by Hierarchical Y Zeolite-containing Mesoporous Silica–Alumina Catalysts Using Curie Point Pyrolyzer

Mesoporous Zeolites: Synthesis and Catalytic Applications

Spontaneous Pillaring of Pentasil Zeolites

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