Synergetic effects of Y-zeolite and amorphous silica-alumina as main FCC catalyst components on triisopropylbenzene cracking and coke formation

Hosseinpour, Negahdar; Mortazavi, Yadollah; Bazyari, Amin; Khodadadi, Abbas Ali

doi:10.1016/j.fuproc.2008.08.013

Cited by 96 publications

(73 citation statements)

References 32 publications

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“…In the present study, a similar situation to the reactor with matrix at the top and zeolite at the bottom was created within the hierarchical structure of the zeolite-containing catalysts in which zeolite was enclosed by the silica _ alumina matrix. If silica _ alumina was positioned above the zeolite separately in a reactor, the selectivity for products increased compared with single use of silica _ alumina and zeolite or a physical mixture 31) . The meso-/microporous composite including 72 wt% of ZSM 5 showed the highest conversion of dodecane at 90 %, whereas only ZSM-5 and a mechanical mixture of ZSM-5 and Al-mesoSiO2 had conversions of 83 % and 85 %, respectively 1) .…”

Section: Effects Of Pore Sizes and Amounts Of Acidmentioning

confidence: 99%

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: Effects Of Pore Sizes and Amounts Of Acidmentioning

confidence: 99%

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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“…Recently, an example using amorphous silica and Y zeolite was reported 23) . In this case, cracking of 1,3,5-triisopropylbenzene was performed.…”

Section: Concerning Reaction Mechanismsmentioning

confidence: 99%

Catalytic Properties of Amorphous Silica-alumina Prepared Using Dicarboxylic and Tricarboxylic Acids as Matrix in Catalytic Cracking of <i>n</i>-Dodecane

篤

広宇

健太郎

et al. 2011

J. Jpn. Petrol. Inst.

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Amorphous silica _ aluminas were prepared by the sol-gel method using carboxylic acids, malic acid (MA), succinic acid and citric acid, and the reactivity for catalytic cracking was investigated. When the ratio of MA/TEOS (tetraethoxysilane) increased, surface area, pore volume and pore diameter increased and mesopores were formed. The maximum total conversions of n-dodecane were around 30% with the single amorphous silica _ alumina. In contrast, the total conversion reached 91% with the single beta-zeolite. To investigate the reactivity of amorphous silica _ alumina as a matrix, mixed catalysts consisting of zeolite, amorphous silica _ alumina and binder (alumina sol) were prepared. The product distribution changed compared with the single zeolite or silica _ alumina, and comparable activity to that of zeolite was obtained although the mixed catalysts included only 1/4 of zeolite. Mixed catalysts using amorphous silica _ alumina with mesopores (MA122-5) exhibited higher ratio of multibranched to single-branched products in the gasoline fraction (C5-C11) than single zeolite. The effect of the addition of 1-dodecene and 1-methylnaphthalene was also investigated.

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“…Recently, we have reported that silica-aluminas with about 5 nm of mesopore prepared using malic acid influence the production of branched hydrocarbons in catalytic cracking of n-dodecane [1,2]. Hosseinpour et al [9], and Q. Tang et al [10], have also reported the matrix effect. However, these reports are not enough to understand the role of the matrix in catalytic cracking.…”

Section: Introductionmentioning

confidence: 95%

“…The pores of zeolite, which mainly consist of micropores, are disadvantageous to carry and diffuse hydrocarbons with large molecular structures, such as vacuum gas oil or atmospheric residue [5,6]. Although silica-alumina is used to control the activity of zeolite or selectivity of catalytic cracking reactions, there are fewer academic studies of silica-alumina than those of zeolite in this field [1,2,[7][8][9][10]. Recently, we have reported that silica-aluminas with about 5 nm of mesopore prepared using malic acid influence the production of branched hydrocarbons in catalytic cracking of n-dodecane [1,2].…”

Section: Introductionmentioning

confidence: 99%

Large Mesopore Generation in an Amorphous Silica-Alumina by Controlling the Pore Size with the Gel Skeletal Reinforcement and Its Application to Catalytic Cracking

Ishihara¹,

Hashimoto²,

Nasu³

2012

Catalysts

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Tetraethoxy orthosilicate (TEOS) was used not only as a precursor of silica, but also as an agent which reinforces the skeleton of silica-gel to prepare an aerogel and resultant silica and silica-alumina with large pore size and pore volume. In this gel skeletal reinforcement, the strength of silica aerogel skeleton was enhanced by aging with TEOS/2-propanol mixed solution to prevent the shrink of the pores. When silica aerogel was reinforced by TEOS solution, the pore diameter and pore volume of calcined silica could be controlled by the amount of TEOS solution and reached 30 nm and 3.1 cm 3 /g. The results from N 2 adsorption measurement indicated that most of pores for this silica consisted of mesopores. Silica-alumina was prepared by the impregnation of an aluminum tri-sec-butoxide/2-butanol solution with obtained silica. Mixed catalysts were prepared by the combination of β-zeolite (26 wt%) and prepared silica-aluminas with large mesopore (58 wt%) and subsequently the effects of their pore sizes on the catalytic activity and the product selectivity were investigated in catalytic cracking of n-dodecane at 500 °C. The mixed catalysts exhibited not only comparable activity to that for single zeolite, but also unique selectivity where larger amounts of branched products were formed.

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Synergetic effects of Y-zeolite and amorphous silica-alumina as main FCC catalyst components on triisopropylbenzene cracking and coke formation

Cited by 96 publications

References 32 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

Catalytic Properties of Amorphous Silica-alumina Prepared Using Dicarboxylic and Tricarboxylic Acids as Matrix in Catalytic Cracking of <i>n</i>-Dodecane

Large Mesopore Generation in an Amorphous Silica-Alumina by Controlling the Pore Size with the Gel Skeletal Reinforcement and Its Application to Catalytic Cracking

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