Catalytic cracking of polyethylene over all-silica MCM-41 molecular sieve

Zaki S. Seddegi; Uwais Budrthumal; Abdulrahman A. Al-Arfaj; Adnan M. Al-Amer; Sami A.I. Barri

doi:10.1016/S0926-860X(01)00872-9

Catalytic cracking of polyethylene over all-silica MCM-41 molecular sieve

Zaki S. Seddegi
, Uwais Budrthumal
, Abdulrahman A. Al-Arfaj
, Adnan M. Al-Amer
, Sami A.I. Barri^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

81 Scopus citations

Abstract

The catalytic cracking of high-density polyethylene has been demonstrated over all-silica MCM-41 catalysts. The cracking activity increases with the degree of crystallinity of the catalysts. The pore diameter of the samples has an effect on the level of the catalytic activity, with catalysts having small pore diameters giving higher activity. A carbenium ion-mediated mechanism is proposed for the cracking reaction, as high levels of isobutene and isobutane and low levels of C1 and C2 were produced. The product distribution was compared with those obtained from thermal cracking tests. The surface acidity of the all-silica MCM-41 is attributed to the presence of silanol groups. It is proposed that the formation and stabilization of carbenium ions in the pores of the catalyst are due to the adsorption interaction between the polyethylinic fragments with the surface of the channels.

Original language	English
Pages (from-to)	167-176
Number of pages	10
Journal	Applied Catalysis A: General
Volume	225
Issue number	1-2
DOIs	https://doi.org/10.1016/S0926-860X(01)00872-9
State	Published - 8 Feb 2002

Bibliographical note

Funding Information:
We would like to acknowledge the financial support for this research by King Abdulaziz City for Science and Technology (KACST) under Project No. AR-16-71. We would also like to acknowledge the Department of Chemistry, and the Department of Chemical Engineering of King Fahd University of Petroleum and Minerals (KFUPM) for their general support.

Keywords

Acidity
Cracking
MCM-41
Mesoporous
Molecular sieve
Polyethylene
Silica

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology

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10.1016/S0926-860X(01)00872-9

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title = "Catalytic cracking of polyethylene over all-silica MCM-41 molecular sieve",

abstract = "The catalytic cracking of high-density polyethylene has been demonstrated over all-silica MCM-41 catalysts. The cracking activity increases with the degree of crystallinity of the catalysts. The pore diameter of the samples has an effect on the level of the catalytic activity, with catalysts having small pore diameters giving higher activity. A carbenium ion-mediated mechanism is proposed for the cracking reaction, as high levels of isobutene and isobutane and low levels of C1 and C2 were produced. The product distribution was compared with those obtained from thermal cracking tests. The surface acidity of the all-silica MCM-41 is attributed to the presence of silanol groups. It is proposed that the formation and stabilization of carbenium ions in the pores of the catalyst are due to the adsorption interaction between the polyethylinic fragments with the surface of the channels.",

keywords = "Acidity, Cracking, MCM-41, Mesoporous, Molecular sieve, Polyethylene, Silica",

author = "Seddegi, \{Zaki S.\} and Uwais Budrthumal and Al-Arfaj, \{Abdulrahman A.\} and Al-Amer, \{Adnan M.\} and Barri, \{Sami A.I.\}",

note = "Funding Information: We would like to acknowledge the financial support for this research by King Abdulaziz City for Science and Technology (KACST) under Project No. AR-16-71. We would also like to acknowledge the Department of Chemistry, and the Department of Chemical Engineering of King Fahd University of Petroleum and Minerals (KFUPM) for their general support.",

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doi = "10.1016/S0926-860X(01)00872-9",

language = "English",

volume = "225",

pages = "167--176",

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AU - Seddegi, Zaki S.

AU - Budrthumal, Uwais

AU - Al-Arfaj, Abdulrahman A.

AU - Al-Amer, Adnan M.

AU - Barri, Sami A.I.

N1 - Funding Information: We would like to acknowledge the financial support for this research by King Abdulaziz City for Science and Technology (KACST) under Project No. AR-16-71. We would also like to acknowledge the Department of Chemistry, and the Department of Chemical Engineering of King Fahd University of Petroleum and Minerals (KFUPM) for their general support.

PY - 2002/2/8

Y1 - 2002/2/8

N2 - The catalytic cracking of high-density polyethylene has been demonstrated over all-silica MCM-41 catalysts. The cracking activity increases with the degree of crystallinity of the catalysts. The pore diameter of the samples has an effect on the level of the catalytic activity, with catalysts having small pore diameters giving higher activity. A carbenium ion-mediated mechanism is proposed for the cracking reaction, as high levels of isobutene and isobutane and low levels of C1 and C2 were produced. The product distribution was compared with those obtained from thermal cracking tests. The surface acidity of the all-silica MCM-41 is attributed to the presence of silanol groups. It is proposed that the formation and stabilization of carbenium ions in the pores of the catalyst are due to the adsorption interaction between the polyethylinic fragments with the surface of the channels.

AB - The catalytic cracking of high-density polyethylene has been demonstrated over all-silica MCM-41 catalysts. The cracking activity increases with the degree of crystallinity of the catalysts. The pore diameter of the samples has an effect on the level of the catalytic activity, with catalysts having small pore diameters giving higher activity. A carbenium ion-mediated mechanism is proposed for the cracking reaction, as high levels of isobutene and isobutane and low levels of C1 and C2 were produced. The product distribution was compared with those obtained from thermal cracking tests. The surface acidity of the all-silica MCM-41 is attributed to the presence of silanol groups. It is proposed that the formation and stabilization of carbenium ions in the pores of the catalyst are due to the adsorption interaction between the polyethylinic fragments with the surface of the channels.

KW - Acidity

KW - Cracking

KW - MCM-41

KW - Mesoporous

KW - Molecular sieve

KW - Polyethylene

KW - Silica

UR - https://www.scopus.com/pages/publications/0037039689

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DO - 10.1016/S0926-860X(01)00872-9

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JO - Applied Catalysis A: General

JF - Applied Catalysis A: General

IS - 1-2

ER -

Catalytic cracking of polyethylene over all-silica MCM-41 molecular sieve

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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