Features of catalytic pyrolysis in the presence of heterogeneous and homogeneous catalysts

Adel'son, S. V.; Vorontsova, T. A.; Nikonov, V. I.; Sokolovskaya, V. G.; Uvarova, Ye.V.

doi:10.1016/0031-6458(79)90001-7

Cited by 2 publications

(4 citation statements)

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“…It is not claimed, with this work, that a-Al203 is completely inactive. Adelson et al (1979) proved that a-alumina and even quartz show some catalytic action compared with an empty reactor.…”

Section: Calcium Aluminate Based Catalystsmentioning

confidence: 97%

“…The high price of ln203 is a discouraging factor for this approach. Adelson et al (1979) suggested KV03 on pumice as a catalyst for the production of ethylene, with promising results. Senes et al (1972) proposed a catalyst with low porosity and containing at least one oxide of the metals of the group, formed by the rare earths and antimony, in small 0888-5885/89/2628-0524$01.50/0 amounts in association with a mixture of refractory oxides with magnesium oxide and zirconium or aluminum oxide.…”

Section: Wrisbergmentioning

confidence: 99%

See 1 more Smart Citation

Catalyst evaluation and kinetic study for ethylene production

Lemonidou¹,

Vasalos²,

Hirschberg³

et al. 1989

Ind. Eng. Chem. Res.

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The need to produce olefins via catalytic cracking has attracted increased attention in recent years. In this paper results are presented with catalysts composed of two or more of the following metal oxides: CaO, A1203, SrO, MgO, Ti02, Mn02, Zr02, and K20. A fixed bed reactor system was used to evaluate the catalysts with n-hexane as feedstock. The best results were obtained with calcium aluminate based catalysts. The higher olefins yields obtained with the new catalysts compared with a-Al203 are explained by the higher conversion obtained at the same process conditions. The kinetics of the pyrolysis of n-hexane was also studied. The overall decomposition reaction is first order both for thermal cracking and for cracking in the presence of catalyst 12CaO7Al203. The kinetic parameters estimated in the presence of the catalyst are kov/ = 4.57 X 106 cm3/(g-s) and Ew = 26130 cal/mol. Literature ReviewThe most commonly used method for manufacturing light olefins is introducing streams rich in paraffinic hydrocarbons, such as ethane, propane, and naphtha, into externally heated tubes. In this thermal decomposition process, the cracking reactions are controlled by varying the composition of the feed materials, the reaction temperature, and the residence time in the reaction tube.This method has some drawbacks, such as the high temperature required for cracking reactions, the deposition of coke in the tubes, and especially low selectivity in ethylene and other desired products (Nowak and Gunsehell, 1983).To overcome these problems, a serious effort started a few years ago to introduce catalysts in the process. Various catalytic processes for the preparation of olefins have been reported, but these processes have not yet been applied commercially because of various difficulties.

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Section: Calcium Aluminate Based Catalystsmentioning

confidence: 97%

Section: Wrisbergmentioning

confidence: 99%

Catalyst evaluation and kinetic study for ethylene production

Lemonidou¹,

Vasalos²,

Hirschberg³

et al. 1989

Ind. Eng. Chem. Res.

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show abstract

“…Catalytic pyrolysis has received attention as an alternative approach to thermal cracking to utilize the feedstock more efficiently because higher yields of ethylene and propylene can be obtained. − In catalytic pyrolysis, catalysts are loaded in the reactor tube through which the mixture of naphtha and steam passes. Recent studies, however, have shown that enhancement of the olefin yields might not be due to the catalytic effects, but rather to the enhancement of heat transfer. − Data appearing in the literature and in patents indicate that high reaction temperatures are required to obtain high olefin yields in catalytic pyrolysis even though these temperatures are slightly lower than those used in thermal cracking.…”

Section: Introductionmentioning

confidence: 99%

“…A number of catalysts have been investigated with various feedstocks for the catalytic pyrolysis of hydrocarbons. Among these catalysts, one of the most promising types has been reported to be the KVO 3 -based catalysts with low-surface-area supports developed by VNIIOS. − ,, Although several articles dealing with coke formation on this catalyst system have been published, − ,, further systematic study has been needed for better understanding.…”

Section: Introductionmentioning

confidence: 99%

Coke Formation on KVO₃−B₂O₃/SA5203 Catalysts in the Catalytic Pyrolysis of Naphtha

Lee¹,

Jeong²,

Chae³

et al. 2004

Ind. Eng. Chem. Res.

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Coke formation on KVO 3 -B 2 O 3 /SA5203 catalysts during naphtha pyrolysis in a fixed-bed reactor was studied. As the KVO 3 loading increased, the amount of coke deposited on KVO 3 -B 2 O 3 / SA5203 decreased, but CO 2 formation increased, indicating that KVO 3 plays a key role in retarding coke accumulation but not in enhancing the product yields. The coke layers formed on the support and KVO 3 -B 2 O 3 /SA5203 were different in their properties. The coke layer formed on KVO 3 -B 2 O 3 / SA5203 was free of soluble coke, which dissolves in the CH 2 Cl 2 solution, and consisted of mainly insoluble coke; in contrast, the coke layer formed on the support consisted of both soluble and insoluble coke. The coke layer on KVO 3 -B 2 O 3 /SA5203 catalyst was porous, whereas that on SA5203 was nonporous. KVO 3 on the catalyst apparently plays a key role in catalyzing the gasification of soluble coke to CO 2 .

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Features of catalytic pyrolysis in the presence of heterogeneous and homogeneous catalysts

Cited by 2 publications

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Catalyst evaluation and kinetic study for ethylene production

Catalyst evaluation and kinetic study for ethylene production

Coke Formation on KVO₃−B₂O₃/SA5203 Catalysts in the Catalytic Pyrolysis of Naphtha

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Features of catalytic pyrolysis in the presence of heterogeneous and homogeneous catalysts

Cited by 2 publications

References 0 publications

Catalyst evaluation and kinetic study for ethylene production

Catalyst evaluation and kinetic study for ethylene production

Coke Formation on KVO3−B2O3/SA5203 Catalysts in the Catalytic Pyrolysis of Naphtha

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Product

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Coke Formation on KVO₃−B₂O₃/SA5203 Catalysts in the Catalytic Pyrolysis of Naphtha