Photoreactions of ethanol and MTBE on metal oxide particles in the troposphere

H. Idriss, A. Miller, E. G. Seebauer

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Ethanol (EtOH) and methyl tert-butyl ether (MTBE) are finding increasing use as fuel additives because of governmental mandates, and the relative merits of each have therefore become the focus of intense debate. The ultimate fate of fugitive emissions of these species forms one aspect of this controversy, because EtOH has been implicated in reductions in air quality, while MTBE has been linked to human illness. Both species have been shown to photoreact rapidly on fly ash particles in urban atmospheres. This work reports kinetic studies as well as detailed surface and bulk characterizations of fly ash by XRD, XPS, and SEM/EDA. The active phases in fly ash are probably Fe and Ti oxides. Addition of water to the reactant gas in some cases more than doubled the reaction rate of EtOH, but hardly affected that rate of MTBE. To gain insight into the respective roles of Fe, Ti, and alkali metals, kinetics were also measured over alkali-modified TiO2 (anatase). Addition of Na or Ca oxides shifted the reaction product of EtOH from total oxidation (CO2) to partial oxidation (acetaldehyde).

Original languageEnglish
Pages (from-to)215-225
Number of pages11
JournalCatalysis Today
Volume33
Issue number1-3
DOIs
Publication statusPublished - 17 Jan 1997

Keywords

  • fly ash
  • MTBE
  • tropospheric chemistry
  • photochemistry
  • heterogeneous photocatalytic oxidation
  • atmospheric chemistry
  • fly-ash
  • gaseous N2O5
  • air
  • formaldehyde
  • aldehydes
  • emissions
  • additives
  • catalysis

Cite this

Photoreactions of ethanol and MTBE on metal oxide particles in the troposphere. / Idriss, H.; Miller, A.; Seebauer, E. G.

In: Catalysis Today, Vol. 33, No. 1-3, 17.01.1997, p. 215-225.

Research output: Contribution to journalArticle

Idriss, H. ; Miller, A. ; Seebauer, E. G. / Photoreactions of ethanol and MTBE on metal oxide particles in the troposphere. In: Catalysis Today. 1997 ; Vol. 33, No. 1-3. pp. 215-225.
@article{1f897bad198f4c7486f97be35cc13883,
title = "Photoreactions of ethanol and MTBE on metal oxide particles in the troposphere",
abstract = "Ethanol (EtOH) and methyl tert-butyl ether (MTBE) are finding increasing use as fuel additives because of governmental mandates, and the relative merits of each have therefore become the focus of intense debate. The ultimate fate of fugitive emissions of these species forms one aspect of this controversy, because EtOH has been implicated in reductions in air quality, while MTBE has been linked to human illness. Both species have been shown to photoreact rapidly on fly ash particles in urban atmospheres. This work reports kinetic studies as well as detailed surface and bulk characterizations of fly ash by XRD, XPS, and SEM/EDA. The active phases in fly ash are probably Fe and Ti oxides. Addition of water to the reactant gas in some cases more than doubled the reaction rate of EtOH, but hardly affected that rate of MTBE. To gain insight into the respective roles of Fe, Ti, and alkali metals, kinetics were also measured over alkali-modified TiO2 (anatase). Addition of Na or Ca oxides shifted the reaction product of EtOH from total oxidation (CO2) to partial oxidation (acetaldehyde).",
keywords = "fly ash, MTBE, tropospheric chemistry, photochemistry, heterogeneous photocatalytic oxidation, atmospheric chemistry, fly-ash, gaseous N2O5, air, formaldehyde, aldehydes, emissions, additives, catalysis",
author = "H. Idriss and A. Miller and Seebauer, {E. G.}",
year = "1997",
month = "1",
day = "17",
doi = "10.1016/S0920-5861(96)00122-8",
language = "English",
volume = "33",
pages = "215--225",
journal = "Catalysis Today",
issn = "0920-5861",
publisher = "Elsevier",
number = "1-3",

}

TY - JOUR

T1 - Photoreactions of ethanol and MTBE on metal oxide particles in the troposphere

AU - Idriss, H.

AU - Miller, A.

AU - Seebauer, E. G.

PY - 1997/1/17

Y1 - 1997/1/17

N2 - Ethanol (EtOH) and methyl tert-butyl ether (MTBE) are finding increasing use as fuel additives because of governmental mandates, and the relative merits of each have therefore become the focus of intense debate. The ultimate fate of fugitive emissions of these species forms one aspect of this controversy, because EtOH has been implicated in reductions in air quality, while MTBE has been linked to human illness. Both species have been shown to photoreact rapidly on fly ash particles in urban atmospheres. This work reports kinetic studies as well as detailed surface and bulk characterizations of fly ash by XRD, XPS, and SEM/EDA. The active phases in fly ash are probably Fe and Ti oxides. Addition of water to the reactant gas in some cases more than doubled the reaction rate of EtOH, but hardly affected that rate of MTBE. To gain insight into the respective roles of Fe, Ti, and alkali metals, kinetics were also measured over alkali-modified TiO2 (anatase). Addition of Na or Ca oxides shifted the reaction product of EtOH from total oxidation (CO2) to partial oxidation (acetaldehyde).

AB - Ethanol (EtOH) and methyl tert-butyl ether (MTBE) are finding increasing use as fuel additives because of governmental mandates, and the relative merits of each have therefore become the focus of intense debate. The ultimate fate of fugitive emissions of these species forms one aspect of this controversy, because EtOH has been implicated in reductions in air quality, while MTBE has been linked to human illness. Both species have been shown to photoreact rapidly on fly ash particles in urban atmospheres. This work reports kinetic studies as well as detailed surface and bulk characterizations of fly ash by XRD, XPS, and SEM/EDA. The active phases in fly ash are probably Fe and Ti oxides. Addition of water to the reactant gas in some cases more than doubled the reaction rate of EtOH, but hardly affected that rate of MTBE. To gain insight into the respective roles of Fe, Ti, and alkali metals, kinetics were also measured over alkali-modified TiO2 (anatase). Addition of Na or Ca oxides shifted the reaction product of EtOH from total oxidation (CO2) to partial oxidation (acetaldehyde).

KW - fly ash

KW - MTBE

KW - tropospheric chemistry

KW - photochemistry

KW - heterogeneous photocatalytic oxidation

KW - atmospheric chemistry

KW - fly-ash

KW - gaseous N2O5

KW - air

KW - formaldehyde

KW - aldehydes

KW - emissions

KW - additives

KW - catalysis

U2 - 10.1016/S0920-5861(96)00122-8

DO - 10.1016/S0920-5861(96)00122-8

M3 - Article

VL - 33

SP - 215

EP - 225

JO - Catalysis Today

JF - Catalysis Today

SN - 0920-5861

IS - 1-3

ER -