Enhancement of washcoat adhesion for SCR catalysts to convert nitrogen oxide using powder spray coating of TiO2 on metallic honeycomb substrate

Hwang, Jiseop; Ha, Ho-Jung; Ryu, Jungho; Choi, Jong‐Jin; Ahn, Cheol‐Woo; Kim, Jong-Woo; Hahn, Byung‐Dong; Yoon, Woon‐Ha; Lee, Heesoo; Choi, Joon‐Hwan

doi:10.1016/j.catcom.2017.02.002

Cited by 21 publications

(8 citation statements)

References 28 publications

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“…Metallic monoliths with the intermediate layer showed much better adhesion property than monoliths without the intermediate layer. The surface-modified monoliths exhibited higher SCR activity than the samples without the intermediate layer after ultrasonic vibration test, indicating a better adhesion property of the washcoating layers . Huang et al developed Cr–V/TiO 2 /cordierite monolithic catalysts by an in situ precipitation method and the TiO 2 coating adhered well to cordierite.…”

Section: Monolith Catalystsmentioning

confidence: 99%

Selective Catalytic Reduction of NO_x with NH₃ by Using Novel Catalysts: State of the Art and Future Prospects

et al. 2019

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Selective catalytic reduction with NH 3 (NH 3 −SCR) is the most efficient technology to reduce the emission of nitrogen oxides (NO x ) from coal-fired industries, diesel engines, etc. Although V 2 O 5 −WO 3 (MoO 3 )/TiO 2 and CHA structured zeolite catalysts have been utilized in commercial applications, the increasing requirements for broad working temperature window, strong SO 2 /alkali/heavy metal-resistance, and high hydrothermal stability have stimulated the development of new-type NH 3 −SCR catalysts. This review summarizes the latest SCR reaction mechanisms and emerging poisonresistant mechanisms in the beginning and subsequently gives a comprehensive overview of newly developed SCR catalysts, including metal oxide catalysts ranging from VO x , MnO x , CeO 2 , and Fe 2 O 3 to CuO based catalysts; acidic compound catalysts containing vanadate, phosphate and sulfate catalysts; ion exchanged zeolite catalysts such as Fe, Cu, Mn, etc. exchanged zeolite catalysts; monolith catalysts including extruded, washcoated, and metal-mesh/foam-based monolith catalysts. The challenges and opportunities for each type of catalysts are proposed while the effective strategies are summarized for enhancing the acidity/redox circle and poison-resistance through modification, creating novel nanostructures, exposing specific crystalline planes, constructing protective/sacrificial sites, etc. Some suggestions are given about future research directions that efforts should be made in. Hopefully, this review can bridge the gap between newly developed catalysts and practical requirements to realize their commercial applications in the near future.

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Section: Monolith Catalystsmentioning

confidence: 99%

Selective Catalytic Reduction of NO_x with NH₃ by Using Novel Catalysts: State of the Art and Future Prospects

et al. 2019

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“…Thus, a NO conversion of 92% at 500 • C has been reported for WO 3 -TiO 2 (GHSV of 11,000 h −1 ) [55], a conversion of 98% at 400 • C was reached by V 2 O 5 -MoO 3 /TiO 2 (GHSV of 6000 h −1 ) [56]. A TiO 2 catalyst showed a conversion of 80% at 300 • C (GHSV of 25,000 h −1 ) [57], 75% at 250 • C for a V 2 O 5 -WO 3 /TiO 2 catalyst (GHSV of 27,000 h −1 ) [58], and 90% at 160 • C for a Cr-V/TiO 2 catalyst (GHSV of 4000 h −1 ) [59]. The impact of SO2 on the cycling performance of MnOx-Fe2O3/VMT MHCs at different temperatures and GHSV values is shown in Figure 6d.…”

Section: Resultsmentioning

confidence: 94%

Enhanced Low Temperature NO Reduction Performance via MnOx-Fe2O3/Vermiculite Monolithic Honeycomb Catalysts

Zhang

Dan

et al. 2018

Catalysts

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Selective catalytic reduction of NO x by ammonia (NH 3 -SCR) was the most efficient and economic technology for De-NO x applications. Therefore, a series of MnO x /vermiculite (VMT) and MnO x -Fe 2 O 3 /VMT catalysts were prepared by an impregnation method for the selective catalytic reduction (SCR) of nitrogen oxides (NO x ). The MnO x -Fe 2 O 3 /VMT catalysts provided an excellent NO conversion of 96.5% at 200 • C with a gas hourly space velocity (GHSV) of 30,000 h −1 and an NO concentration of 500 ppm. X-ray photoelectron spectroscopy results indicated that the Mn and Fe oxides of the MnO x -Fe 2 O 3 /VMT catalyst were mainly composed of MnO 2 and Fe 2 O 3 . However, the MnO 2 and Fe 2 O 3 components were well dispersed because no discernible MnO 2 and Fe 2 O 3 phases were observed in X-ray powder diffraction spectra. Corresponding MnO x -Fe 2 O 3 /VMT monolithic honeycomb catalysts (MHCs) were prepared by an extrusion method, and the MHCs achieved excellent SCR activity at low temperature, with an NO conversion greater than 98.6% at 150 • C and a GHSV of 4000 h −1 . In particular, the MnO x -Fe 2 O 3 /VMT MHCs provided a good SCR activity at room temperature (20 • C), with an NO conversion of 62.2% (GHSV = 1000 h −1 ). In addition, the NO reduction performance of the MnO x -Fe 2 O 3 /VMT MHCs also demonstrated an excellent SO 2 resistance.

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“…Although the technology is commercially applicable, still the products used in it are rated as shock sensitive and undergo delamination under the influence of thermal shocks. It also does not use full amount of catalytically active phase dispersed within the composite layer and on the contact surface with exhaust gases based on the weight of the composite material deposited as a layer [20,21]. A different design of catalyst systems is based on metal monoliths.…”

Section: Introductionmentioning

confidence: 99%

On the morphological investigation of Pt dispersion and structure of alumina-platinum composites obtained by thermal oxidation of Al-Pt nano thin layers

Reszka

Morgiel

Rydzkowski

et al. 2019

Nano-Structures & Nano-Objects

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This article presents the methodology for the Pt/Al and Pt/Al nanolaminates production as well as Pt + Al composites using two magnetrons by preparing the oxide-metal composites through high temperature oxidation of nanofilms deposited by PVD method on a metal substrate. In this article, we described the nanostructures obtained as a result of PVD technology. The applied layers were oxidized at a temperature of 860°C under Ar + O2 for 48 hours. SEM surface analysis of the obtained nanolaminates showed that the base of the oxidized laminates was covered with a fine wafer and whisker structure with an anisotropic growth orientation. Oxidation of composite layers provided the growth of chaotically oriented and mutually penetrable whiskers and small crystals. Analysis of nanolayers by the TEM technique indicated that the growth of oxide crystals leads to the dissipation of Pt particles. The comparison of oxide layers obtained with the Pt/Al system with oxide layers obtained with Pt + Al composite nanofilms indicates that those obtained through the oxidation of nanofilms shows a greater surface development. This is due to the partial covering of Pt particles through the Al layer, which causes a very strong fragmentation of the Pt nanofilms occurring during oxidation. During the oxidation in the entire volume of nanofilms, strong stresses are created that cause numerous nano-cracks, which promotes the expansion of the surface and its high activity.

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Enhancement of washcoat adhesion for SCR catalysts to convert nitrogen oxide using powder spray coating of TiO2 on metallic honeycomb substrate

Cited by 21 publications

References 28 publications

Selective Catalytic Reduction of NO_x with NH₃ by Using Novel Catalysts: State of the Art and Future Prospects

Selective Catalytic Reduction of NO_x with NH₃ by Using Novel Catalysts: State of the Art and Future Prospects

Enhanced Low Temperature NO Reduction Performance via MnOx-Fe2O3/Vermiculite Monolithic Honeycomb Catalysts

On the morphological investigation of Pt dispersion and structure of alumina-platinum composites obtained by thermal oxidation of Al-Pt nano thin layers

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Enhancement of washcoat adhesion for SCR catalysts to convert nitrogen oxide using powder spray coating of TiO2 on metallic honeycomb substrate

Cited by 21 publications

References 28 publications

Selective Catalytic Reduction of NOx with NH3 by Using Novel Catalysts: State of the Art and Future Prospects

Selective Catalytic Reduction of NOx with NH3 by Using Novel Catalysts: State of the Art and Future Prospects

Enhanced Low Temperature NO Reduction Performance via MnOx-Fe2O3/Vermiculite Monolithic Honeycomb Catalysts

On the morphological investigation of Pt dispersion and structure of alumina-platinum composites obtained by thermal oxidation of Al-Pt nano thin layers

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Selective Catalytic Reduction of NO_x with NH₃ by Using Novel Catalysts: State of the Art and Future Prospects

Selective Catalytic Reduction of NO_x with NH₃ by Using Novel Catalysts: State of the Art and Future Prospects