Promoted Soot Oxidation by Doped K2Ti2O5 Catalysts and NO Oxidation Catalysts

Wang, Qiang; Chung, Jong Shik; Guo, Zhanhu

doi:10.1021/ie200698j

Cited by 30 publications

(24 citation statements)

References 41 publications

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“…Additionally, six potassium-based catalysts were doped with copper, cobalt, or cerium in an attempt to enhance catalyst activity. K 2 Ti 2 O 5 was doped with cobalt, copper, or cerium by using the corresponding nitrate salts and incipient wetness impregnation to produce 5 wt% metal-K 2 Ti 2 O 5 ; the catalysts were calcined at 850 °C for 6 hours [22]. A cerium oxidebased catalyst (K-Co-CeO 2 ) was produced by incipient wetness impregnation using cerium oxide, cobalt acetate, and potassium carbonate and calcined at 850 °C for 12 hours [23].…”

Section: Catalyst Synthesismentioning

confidence: 99%

“…Evidence in the literature suggests that doping potassium oxide catalysts with certain metals can improve activity toward soot oxidation. Wang et al [22] found that doping K 2 Ti 2 O 5 with copper, cobalt, or cerium can lower soot oxidation temperatures when in the presence of NO. Lopez-Suarez et al [21] observed that adding copper to K/SrTiO 3 catalysts can improve soot oxidation activity, while Jakubek et al [25] showed that combining potassium and cobalt (K 0.25 CoO 2 ) further enhances soot oxidation activity.…”

Section: Doping Potassium Oxide Catalysts With Transition State Metalsmentioning

confidence: 99%

“…Previous research has shown that doping K 2 Ti 2 O 5 can effectively improve oxidation rates. For example, Wang et al [22] found that doping K 2 Ti 2 O 5 with cobalt promoted oxidation of NO to NO 2 . In an attempt to improve CO oxidation activity, K 2 Ti 2 O 5 was doped with several different metals, including cobalt, copper, and cerium.…”

Section: Carbon Monoxide Oxidationmentioning

confidence: 99%

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Gaseous and particulate emissions from a chimneyless biomass cookstove equipped with a potassium catalyst

et al. 2019

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Approximately three billion people cook with solid fuels, mostly wood, on open fires or rudimentary stoves. These traditional cooking methods produce particulate matter and carbon monoxide known to cause significant respiratory health problems, especially among women and children, who often have the highest exposure. In this work, an inexpensive potassium-based catalyst was incorporated in a chimneyless biomass cookstove to reduce harmful emissions through catalytic oxidation. Potassium titanate was identified as an effective and stable oxidation catalyst capable of oxidizing particulate matter and carbon monoxide. Using a cordierite monolith to incorporate potassium titanate within a bespoke, rocket-style, improved cookstove led to a 36% reduction in particulate matter emissions relative to a baseline stove with a blank monolith and a 26% reduction relative to a stove with no monolith. Additionally, the catalytic stove reduced particulate matter emissions by 82%, reduced carbon monoxide emissions by 70%, and improved efficiency by 100% compared to a carefully tended, three-stone fire. Potassium titanate was also shown to oxidize carbon monoxide at temperatures as low as 500 °C, or as low as 300 °C when doped with copper or cobalt.

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Section: Catalyst Synthesismentioning

confidence: 99%

Section: Doping Potassium Oxide Catalysts With Transition State Metalsmentioning

confidence: 99%

Section: Carbon Monoxide Oxidationmentioning

confidence: 99%

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Gaseous and particulate emissions from a chimneyless biomass cookstove equipped with a potassium catalyst

et al. 2019

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“…However, Ti 4+ fivefold coordination was reported later in titanite and zirconolite minerals (Farges, 1997), in a natural titanosilicate mineral (Foster et al, 1999), as well as in a few synthetic compounds (Lii, 1995;Roberts et al, 1996). The MTO compounds offer a certain interest for chemistry because of their oxidation abilities (Wang & Chung, 2009;Wang et al, 2011) but their electrical properties have not been investigated until recently (Federicci et al, 2017) .…”

Section: Introductionmentioning

confidence: 99%

The crystal structure of Rb₂Ti₂O₅

Federicci

Finocchi

Popa

et al. 2017

Acta Crystallogr Sect B

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Recent results have demonstrated an exceptionally high permittivity in the range 200-330 K in crystalline titanium oxide Rb 2 Ti 2 O 5 . In this article, the possibility of a structural transition giving rise to ferroelectricity is carefully inspected. In particular, X-ray diffraction, high-resolution transmission electron microscopy and Raman spectroscopy are performed. The crystal structure is shown to remain invariant and centrosymmetric at all temperatures between 90 K and 450 K. The stability of the C2/m structure is confirmed by density functional theory calculations. These important findings allow the existence of a conventional ferroelectric phase transition to be ruled out as a possible mechanism for the colossal permittivity and polarization observed in this material.

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“…Good activity of potassium titanate based materials has been reported in the case of an H 2 -SCR process and in the simultaneous removal of NO x and soot [25,26]. Although high NO x adsorption capacities have been reported for potassium titanates, NO x adsorption/reduction mechanisms over these catalysts need to be further verified and rationalized.…”

Section: Introductionmentioning

confidence: 99%