Performance and properties of K and TiO2 based LNT catalysts

Righini, Laura; Gao, Feng; Lietti, Luca; Szanyi, János; Peden, Charles H. F.

doi:10.1016/j.apcatb.2015.07.008

Cited by 9 publications

(4 citation statements)

References 42 publications

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“…This generated hydrogen gas creates the oxygen vacancies via H 2 reduction of Ti 4+ on the surface [31,34]. The digital micrograph of the precursor and the final product is depicted in the Figure 1(A), which shows the change in from gray TiB 2 to blue colored TiO 2 .The X-ray diffraction pattern of the precursor TiB 2 and the prepared TiO 2 were provided in Figure 1(B), which confirms the complete transformation of TiB 2 to TiO 2 and matched with the anatase TiO 2 (JCPDS No: 021-1272) [35]. The implication of the bule colored TiO 2 can be corelated with the vacancy of oxygen, disordered surface and deficiency of oxygen which can be confirmed using the spectroscopic analysis such as electron spin resonance spectroscopy (ESR), UV-visible (UV-vis) and photoluminescence (PL) respectively.…”

Section: Physicochemical Characterization Of the Blue Tio 2 Nanosheetsmentioning

confidence: 77%

Energy Storage Properties of Topochemically Synthesized Blue TiO₂ Nanostructures in Aqueous and Organic Electrolyte

Pazhamalai¹,

Krishnamoorthy²,

Kim³

2022

21st Century Nanostructured Materials - Physics, Chemistry, Classification, and Emerging Applications in Industry, Biomedicine,

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This book chapter discusses the topochemical synthesis of blue titanium oxide (b-TiO2) and their application as electrode material for supercapacitor devices in aqueous and organic electrolytes. The formation mechanism of b-TiO2 via topochemical synthesis and their characterization using X-ray diffraction, UV–visible, photoluminescence, electron spin resonance spectroscopy, laser Raman spectrum, X-ray photoelectron spectroscopy, and morphological studies (FESEM and HR-TEM) are discussed in detail. The supercapacitive properties of b-TiO2 electrode were studied using both aqueous (Na2SO4) and organic (TEABF4) electrolytes. The b-TiO2 based symmetric-type supercapacitor (SC) device using TEABF4 works over a wide voltage window (3 V) and delivered a high specific capacitance (3.58 mF cm−2), possess high energy density (3.22 μWh cm−2) and power density (8.06 mW cm−2) with excellent cyclic stability over 10,000 cycles. Collectively, this chapter highlighted the use of b-TiO2 sheets as an advanced electrode for 3.0 V supercapacitors.

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Section: Physicochemical Characterization Of the Blue Tio 2 Nanosheetsmentioning

confidence: 77%

Energy Storage Properties of Topochemically Synthesized Blue TiO₂ Nanostructures in Aqueous and Organic Electrolyte

Pazhamalai¹,

Krishnamoorthy²,

Kim³

2022

21st Century Nanostructured Materials - Physics, Chemistry, Classification, and Emerging Applications in Industry, Biomedicine,

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“…61 Potassium titanates ("K2Ti6O13-like") can also be produced by calcination of Pt-K/TiO2 at 550°C. 62 An additional deposition of potassium on Ktitanates of nanobelt-shape (KTN catalysts) can reinforce the NOx storage capacity at high temperature. 63,64 Nevertheless, these KTN supports require a lengthy preparation by reaction of TiO2 with KOH, then heating in autoclave at 130°C for 4 days.…”

Section: Potassium-doped Nsr Catalystsmentioning

confidence: 99%

Chapter 3. NSR Catalytic Materials

Can¹,

Courtois²,

Duprez³

2018

Catalysis Series

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Imagined in the 90's, the NOx-storage and reduction (NSR) process operates with alternative cycles of long lean phases (NOx storage) and short rich phases (NOx reduction). NSR catalysts should possess at least two components: a basic oxide for trapping the NOx and a metallic component for the NO oxidation and the reduction of stored NOx. The reference material is composed of barium oxide (10-20 wt-%) deposited on a Pt/Al2O3 (1-2 % Pt). Improvements of NSR catalysts were obtained by changing (i) the basic component (especially potassium but it can also damage the catalyst substrate; other alkaline or alkaline-earth oxides were also envisaged); (ii) the support (especially cerium-based supports, or titania, hydrotalcites, perovskites); (iii) the metal (Rh is often added to improve the NOx reduction, and combinations of precious metals are considered). Noble metal-free catalysts were also developed, mainly based on cobalt, copper or manganese oxides. Perovskites including these transition metal oxides and potassium are also interesting for NSR applications. However, complete replacement of noble metal catalysts cannot be feasible yet. Usual NSR catalysts are sensitive to aging (sintering; strong of Ba-support interactions) and to sulphur poisoning but supports like TiO2 or cerium-based oxides can protect the catalyst from stable sulphate adsorption.

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“…Kim et al [14] concluded that lanthanum-based perovskites can be considered viable automotive catalysts, reaching the maximum NOx conversion at 400ºC, even though the addition of a smaller amount of a PGM is mandatory to fulfill the sulfur resistance required. In addition, Shen et al [15] and Righini et al [16], studied the stability of potassium titanates as NOx adsorbents and concluded that the incorporation of potassium shifts the NOx adsorption to higher temperatures, though the mobility and reactivity of potassium at the required working temperatures made this catalyst not suitable for LNT application. Therefore, in spite of all these studies, more efforts have to be done to improve the NOx conversion and sulfur tolerance and regeneration before perovskites are ready to be used as LNT catalysts at high temperature.…”

Section: Introductionmentioning

confidence: 99%

Tolerance and regeneration versus SO2 of Ba0.9A0.1Ti0.8Cu0.2O3 (A = Sr, Ca, Mg) LNT catalysts

Albaladejo-Fuentes

Sánchez-Adsuar

Illán-Gómez

2019

Applied Catalysis A: General

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In this paper, the tolerance and stability versus SO2 of Ba0.9A0.1Ti0.8Cu0.2O3 (A = Sr, Ca, Mg) perovskite-type catalysts for NOx storage application have been analyzed at 400ºC. Characterization results show that only strontium and magnesium are introduced into the perovskite structure. From those data, it can be concluded that the incorporation of Sr into the Ba0.9Sr0.1Ti0.8Cu0.2O3 catalyst promotes the generation of higher amount of NOx adsorption active sites compared to the former BaTi0.8Cu0.2O3 perovskite. On the contrary, for Ba0.9Mg0.1Ti0.8Cu0.2O3 catalyst, copper is segregated from the catalyst lattice to the surface due to the incorporation of magnesium into the B site of the perovskite.The partial substitution of barium in Ba0.9Sr0.1Ti0.8Cu0.2O3 and Ba0.9Mg0.1Ti0.8Cu0.2O3 catalysts leads to increases the NOx Storage Capacity (460 and 415 mol/g.cat. in saturation conditions, respectively), stability and tolerance versus SO2 compared to the raw BaTi0.8Cu0.2O3 perovskite.

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Performance and properties of K and TiO2 based LNT catalysts

Cited by 9 publications

References 42 publications

Energy Storage Properties of Topochemically Synthesized Blue TiO₂ Nanostructures in Aqueous and Organic Electrolyte

Energy Storage Properties of Topochemically Synthesized Blue TiO₂ Nanostructures in Aqueous and Organic Electrolyte

Chapter 3. NSR Catalytic Materials

Tolerance and regeneration versus SO2 of Ba0.9A0.1Ti0.8Cu0.2O3 (A = Sr, Ca, Mg) LNT catalysts

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Performance and properties of K and TiO2 based LNT catalysts

Cited by 9 publications

References 42 publications

Energy Storage Properties of Topochemically Synthesized Blue TiO2 Nanostructures in Aqueous and Organic Electrolyte

Energy Storage Properties of Topochemically Synthesized Blue TiO2 Nanostructures in Aqueous and Organic Electrolyte

Chapter 3. NSR Catalytic Materials

Tolerance and regeneration versus SO2 of Ba0.9A0.1Ti0.8Cu0.2O3 (A = Sr, Ca, Mg) LNT catalysts

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Energy Storage Properties of Topochemically Synthesized Blue TiO₂ Nanostructures in Aqueous and Organic Electrolyte

Energy Storage Properties of Topochemically Synthesized Blue TiO₂ Nanostructures in Aqueous and Organic Electrolyte