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@article{57913043ca064a09a6bace3887064196,
title = "Conversion of methanol to hydrocarbons over conventional and mesoporous H-ZSM-5 and H-Ga-MFI: Major differences in deactivation behavior",
keywords = "Gallium, Regeneration, Zeolite, Deactivation, Methanol-to-hydrocarbons (MTH)",
publisher = "Elsevier BV",
author = "Mentzel, {Uffe Vie} and Højholt, {Karen Thrane} and Holm, {Martin Spangsberg} and Rasmus Fehrmann and Pablo Beato",
year = "2012",
doi = "10.1016/j.apcata.2012.01.003",
volume = "417-418",
pages = "290--297",
journal = "Applied Catalysis A: General",
issn = "0926-860X",

}

RIS

TY - JOUR

T1 - Conversion of methanol to hydrocarbons over conventional and mesoporous H-ZSM-5 and H-Ga-MFI: Major differences in deactivation behavior

A1 - Mentzel,Uffe Vie

A1 - Højholt,Karen Thrane

A1 - Holm,Martin Spangsberg

A1 - Fehrmann,Rasmus

A1 - Beato,Pablo

AU - Mentzel,Uffe Vie

AU - Højholt,Karen Thrane

AU - Holm,Martin Spangsberg

AU - Fehrmann,Rasmus

AU - Beato,Pablo

PB - Elsevier BV

PY - 2012

Y1 - 2012

N2 - Methanol has been converted to hydrocarbons over conventional and mesoporous H-ZSM-5 and H-Ga-MFI. The gallium based zeotypes are analogous to H-ZSM-5, but the Brønsted acidity is introduced by framework incorporation of gallium rather than aluminum, which leads to lower intrinsic acid strength. In the methanol-to-hydrocarbons (MTH) process, H-ZSM-5 is subjected to coke formation leading to catalyst deactivation. Here we show that when the gallium containing zeotypes are employed in the MTH process, only insignificant amounts of coke are present in the deactivated catalysts, indicating distinct differences in deactivation mechanisms of the two different catalysts. This is investigated further through FT-IR measurements as well as catalytic experiments employing regenerated and steamed catalysts. From this it is concluded that the H-Ga-MFI is subjected to irreversible deactivation by steaming (hydrolysis) of the Ga&sbnd;O bonds in the zeolite structure rather than coke deposition.

AB - Methanol has been converted to hydrocarbons over conventional and mesoporous H-ZSM-5 and H-Ga-MFI. The gallium based zeotypes are analogous to H-ZSM-5, but the Brønsted acidity is introduced by framework incorporation of gallium rather than aluminum, which leads to lower intrinsic acid strength. In the methanol-to-hydrocarbons (MTH) process, H-ZSM-5 is subjected to coke formation leading to catalyst deactivation. Here we show that when the gallium containing zeotypes are employed in the MTH process, only insignificant amounts of coke are present in the deactivated catalysts, indicating distinct differences in deactivation mechanisms of the two different catalysts. This is investigated further through FT-IR measurements as well as catalytic experiments employing regenerated and steamed catalysts. From this it is concluded that the H-Ga-MFI is subjected to irreversible deactivation by steaming (hydrolysis) of the Ga&sbnd;O bonds in the zeolite structure rather than coke deposition.

KW - Gallium

KW - Regeneration

KW - Zeolite

KW - Deactivation

KW - Methanol-to-hydrocarbons (MTH)

U2 - 10.1016/j.apcata.2012.01.003

DO - 10.1016/j.apcata.2012.01.003

JO - Applied Catalysis A: General

JF - Applied Catalysis A: General

SN - 0926-860X

VL - 417-418

SP - 290

EP - 297

ER -