Catalytic hydrotreating of heavy vacuum gas oil on Al- and Ti-pillared clays prepared by conventional and microwave irradiation methods

M. J. Martínez-Ortiz, G. Fetter, J. M. Domínguez, J. A. Melo-Banda, R. Ramos-Gómez

Research output: Contribution to journalArticle

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Abstract

Alternate microwave irradiation methods were used for preparing Al- and Ti-pillared clays from the natural swelling montmorillonite of Durango (Mexico) and precursor salts (AlCl3 and TiCl4). Their properties were compared with Al- and Ti-PILCS (pillared interlayered clays) prepared by conventional methods. The solids treated with microwave radiation have a stacking order with d001 of 18.8 Å for Al-PILCS and a distribution of d001 values between 14 and 22 Å for Ti-PILCS. In contrast, the conventional materials show similar interplanar spacings (d001) for Al-PILCS but a delaminated structure is always obtained for Ti-PILCS after calcining in air at 400 °C. The surface areas (BET) of the pillared clays varied between 200 and 360 m2/g. The pyridine-FTIR spectra of both series indicated mostly the presence of Lewis acid sites, up to 400 μmol Py/g. Atomic absorption spectroscopy indicated a significant variation of the Si/Al ratio for Ti-PILCS, caused by partial dealumination. Co-Mo/PILCS catalysts prepared by microwave methods were compared against CoMo/γ-Al2O3 (industrial catalysts) in the HDS of heavy vacuum gas oil derived from Maya crude (sulfur content: 2.21 wt.%). The Co-Mo/Al-PILCS from microwave radiation methods had the highest surface area (BET), i.e. 358 m2/g, and was more active with respect to the reference catalysts under the specific conditions used (32.6% versus 29.8% HDS/g(cat)). © 2002 Published by Elsevier Science Inc.
Original languageAmerican English
Pages (from-to)73-80
Number of pages64
JournalMicroporous and Mesoporous Materials
DOIs
StatePublished - 4 Mar 2003

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Microwave irradiation
Gas oils
clays
Clay
oils
Microwaves
Vacuum
microwaves
vacuum
Catalysts
irradiation
gases
catalysts
Bentonite
Atomic spectroscopy
Lewis Acids
Clay minerals
Absorption spectroscopy
Sulfur
Pyridine

Cite this

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title = "Catalytic hydrotreating of heavy vacuum gas oil on Al- and Ti-pillared clays prepared by conventional and microwave irradiation methods",
abstract = "Alternate microwave irradiation methods were used for preparing Al- and Ti-pillared clays from the natural swelling montmorillonite of Durango (Mexico) and precursor salts (AlCl3 and TiCl4). Their properties were compared with Al- and Ti-PILCS (pillared interlayered clays) prepared by conventional methods. The solids treated with microwave radiation have a stacking order with d001 of 18.8 {\AA} for Al-PILCS and a distribution of d001 values between 14 and 22 {\AA} for Ti-PILCS. In contrast, the conventional materials show similar interplanar spacings (d001) for Al-PILCS but a delaminated structure is always obtained for Ti-PILCS after calcining in air at 400 °C. The surface areas (BET) of the pillared clays varied between 200 and 360 m2/g. The pyridine-FTIR spectra of both series indicated mostly the presence of Lewis acid sites, up to 400 μmol Py/g. Atomic absorption spectroscopy indicated a significant variation of the Si/Al ratio for Ti-PILCS, caused by partial dealumination. Co-Mo/PILCS catalysts prepared by microwave methods were compared against CoMo/γ-Al2O3 (industrial catalysts) in the HDS of heavy vacuum gas oil derived from Maya crude (sulfur content: 2.21 wt.{\%}). The Co-Mo/Al-PILCS from microwave radiation methods had the highest surface area (BET), i.e. 358 m2/g, and was more active with respect to the reference catalysts under the specific conditions used (32.6{\%} versus 29.8{\%} HDS/g(cat)). {\circledC} 2002 Published by Elsevier Science Inc.",
author = "Mart{\'i}nez-Ortiz, {M. J.} and G. Fetter and Dom{\'i}nguez, {J. M.} and Melo-Banda, {J. A.} and R. Ramos-G{\'o}mez",
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Catalytic hydrotreating of heavy vacuum gas oil on Al- and Ti-pillared clays prepared by conventional and microwave irradiation methods. / Martínez-Ortiz, M. J.; Fetter, G.; Domínguez, J. M.; Melo-Banda, J. A.; Ramos-Gómez, R.

In: Microporous and Mesoporous Materials, 04.03.2003, p. 73-80.

Research output: Contribution to journalArticle

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T1 - Catalytic hydrotreating of heavy vacuum gas oil on Al- and Ti-pillared clays prepared by conventional and microwave irradiation methods

AU - Martínez-Ortiz, M. J.

AU - Fetter, G.

AU - Domínguez, J. M.

AU - Melo-Banda, J. A.

AU - Ramos-Gómez, R.

PY - 2003/3/4

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N2 - Alternate microwave irradiation methods were used for preparing Al- and Ti-pillared clays from the natural swelling montmorillonite of Durango (Mexico) and precursor salts (AlCl3 and TiCl4). Their properties were compared with Al- and Ti-PILCS (pillared interlayered clays) prepared by conventional methods. The solids treated with microwave radiation have a stacking order with d001 of 18.8 Å for Al-PILCS and a distribution of d001 values between 14 and 22 Å for Ti-PILCS. In contrast, the conventional materials show similar interplanar spacings (d001) for Al-PILCS but a delaminated structure is always obtained for Ti-PILCS after calcining in air at 400 °C. The surface areas (BET) of the pillared clays varied between 200 and 360 m2/g. The pyridine-FTIR spectra of both series indicated mostly the presence of Lewis acid sites, up to 400 μmol Py/g. Atomic absorption spectroscopy indicated a significant variation of the Si/Al ratio for Ti-PILCS, caused by partial dealumination. Co-Mo/PILCS catalysts prepared by microwave methods were compared against CoMo/γ-Al2O3 (industrial catalysts) in the HDS of heavy vacuum gas oil derived from Maya crude (sulfur content: 2.21 wt.%). The Co-Mo/Al-PILCS from microwave radiation methods had the highest surface area (BET), i.e. 358 m2/g, and was more active with respect to the reference catalysts under the specific conditions used (32.6% versus 29.8% HDS/g(cat)). © 2002 Published by Elsevier Science Inc.

AB - Alternate microwave irradiation methods were used for preparing Al- and Ti-pillared clays from the natural swelling montmorillonite of Durango (Mexico) and precursor salts (AlCl3 and TiCl4). Their properties were compared with Al- and Ti-PILCS (pillared interlayered clays) prepared by conventional methods. The solids treated with microwave radiation have a stacking order with d001 of 18.8 Å for Al-PILCS and a distribution of d001 values between 14 and 22 Å for Ti-PILCS. In contrast, the conventional materials show similar interplanar spacings (d001) for Al-PILCS but a delaminated structure is always obtained for Ti-PILCS after calcining in air at 400 °C. The surface areas (BET) of the pillared clays varied between 200 and 360 m2/g. The pyridine-FTIR spectra of both series indicated mostly the presence of Lewis acid sites, up to 400 μmol Py/g. Atomic absorption spectroscopy indicated a significant variation of the Si/Al ratio for Ti-PILCS, caused by partial dealumination. Co-Mo/PILCS catalysts prepared by microwave methods were compared against CoMo/γ-Al2O3 (industrial catalysts) in the HDS of heavy vacuum gas oil derived from Maya crude (sulfur content: 2.21 wt.%). The Co-Mo/Al-PILCS from microwave radiation methods had the highest surface area (BET), i.e. 358 m2/g, and was more active with respect to the reference catalysts under the specific conditions used (32.6% versus 29.8% HDS/g(cat)). © 2002 Published by Elsevier Science Inc.

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