Enhanced Catalytic Activity of Pd Supported on TiO2 Nanowire for the H2-SCR of NOx in the Presence of Oxygen

Xu, Shiyu; Zhang, Yiyang; Hardacre, Christopher; Liu, Zhiming

doi:10.1021/acssuschemeng.3c01864

Cited by 5 publications

(2 citation statements)

References 52 publications

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“…Previous review articles − have summarized that among the various catalysts studied for the H 2 –SCR, supported Pt catalysts exhibit the highest activity, particularly at low-temperature ranges (<200 °C); however, the formation of N 2 O more than that of N 2 at low temperatures is a major drawback. Supported Pd catalysts promote the low-temperature H 2 –SCR with a sufficiently higher N 2 selectivity than Pt catalysts; − however, they are less active than Pt-based materials. Therefore, considerable efforts have been devoted to improving the N 2 selectivity of Pt catalysts and/or to enhance the catalytic activity of Pd catalysts.…”

Section: Introductionmentioning

confidence: 99%

Pt Oxide Nanoclusters Supported on ZrP₂O₇ for Selective NO_x Reduction by H₂ in the Presence of O₂ with Negligible NH₃, N₂O, and NO₂ Byproducts

Machida,

Nishiyama,

Furukubo

et al. 2023

ACS Appl. Nano Mater.

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Pt/ZrP 2 O 7 catalysts exhibiting high activity for catalytic NO x reduction by H 2 in the presence of excess O 2 were developed in this study. At a low temperature of 125 °C and a high space velocity of approximately 5 × 10 4 h −1 , 0.4 wt % Pt/ZrP 2 O 7 facilitated a higher NO conversion to N 2 (51%) than 0.4 wt % Pt/ZrO 2 (<5%) for a reaction mixture of 200 ppm NO, 5000 ppm H 2 , 10% O 2 , and He balance. However, N 2 O and NO 2 production increased at temperatures lower than 100 °C and higher than 200 °C, thereby decreasing the N 2 yield. High-resolution electron microscopy and X-ray photoelectron spectroscopy analyses of 0.4 wt % Pt/ZrP 2 O 7 revealed the coexistence of large metallic Pt crystallites with sizes of ∼20 nm and highly dispersed Pt oxide nanoclusters. When Pt loading was decreased to 0.05 wt %, the large metallic Pt crystallites disappeared, and only the Pt oxide nanoclusters remained on ZrP 2 O 7 . Owing to this structural change, N 2 O/NO 2 formation was significantly suppressed, enabling highly selective NO reduction to N 2 . Moreover, catalyst preparation by equilibrium adsorption instead of wet impregnation further improved the reaction, achieving >90% selective NO conversion to N 2 , which was nearly free of undesired byproducts (NH 3 , N 2 O, and NO 2 ) at 175 °C. The Pt oxide nanocluster supported on ZrP 2 O 7 was more tolerant to the presence of 10% water vapor in the exhaust gas than the metallic Pt particles. Therefore, the developed catalyst is suitable for applications in practical exhaust gas purification for H 2 -fueled internal combustion engines.

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Section: Introductionmentioning

confidence: 99%

Pt Oxide Nanoclusters Supported on ZrP₂O₇ for Selective NO_x Reduction by H₂ in the Presence of O₂ with Negligible NH₃, N₂O, and NO₂ Byproducts

Machida,

Nishiyama,

Furukubo

et al. 2023

ACS Appl. Nano Mater.

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“…Changing the morphology of TiO 2 can improve its catalytic performance. Many special nanostructured TiO 2 materials have been developed, such as nanosheets, nanowire, nanotubes, nanorods, hollow nanoboxes, and so on. Wang et al prepared TiO 2 nanosheets with surfaces containing fluoride ions and oxygen vacancies, which showed excellent performance in the photocatalytic degradation of volatile organic compounds .…”

Section: Introductionmentioning

confidence: 99%

Structural Diversity Design, Four Nucleation Methods Growth and Mechanism of 3D Hollow Box TiO₂ Nanocrystals with a Temperature-Controlled High (001) Crystal Facets Exposure Ratio

Liao,

Liu,

et al. 2023

ACS Omega

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Three-dimensional (3D) hollow box TiO2 nanocrystals with structural diversity have been designed and grown by four nucleation methods, including the acid dissolution denucleation method with Fe2O3 as heterogeneous nucleation, the topological phase transition method, the sonic solvothermal method, and the air atmosphere sintering method with TiOF2 as homogeneous nucleation. Through full morphology analysis and structural characterization, reasonable growth mechanisms of 3D hollow box TiO2 nanocrystals were proposed, including nucleation dissolution, Oswald ripening, and hydrolysis reactions. It was found that the high energy (001) crystal facets exposure ratio was closely correlated with reaction temperature of four nucleation-methods, which even reached 92% for the first time. Under simulated sunlight irradiation, their hydrogen production performance and photocatalytic degradation efficiency on model dye molecules rhodamine B (RhB) and methylene blue (MB) were evaluated, and as-prepared hollow box TiO2 nanocrystals prepared by the sonic solvothermal method exhibited the best photocatalytic performance, with a hydrogen production rate of 93.88 μmol/g/h. Within 70 min, the photocatalytic degradation rates of RhB and MB reached 96.59 and 75.25%, respectively, which were 5.74 and 5.54 times that of P25. Their properties are closely connected with the orderly cubic and hierarchy configuration structure of hollow box TiO2 nanocrystals, which have a high exposure ratio of (001) facet controlled by reaction temperatures, thereby greatly improving the photocatalytic activity. This study provides a classic reference for improving the properties of hollow box TiO2 nanocrystals through structural diversity design and various methods of nanocrystal growth.

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Selective Catalytic Reduction of Nitrogen Oxides with Hydrogen (H₂‐SCR‐DeNO_x) over Platinum‐Based Catalysts

Jabłońska,

Osorio Hernández

2024

ChemCatChem

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Selective catalytic reduction of NOx with hydrogen (H2‐SCR‐DeNOx) is applied among other techniques (i.e., SCR‐DeNOx by applying NH3 or hydrocarbons as reducing agents) to control nitrogen oxides from mobile and stationary sources. As a zero carbon technology, which efficiently reduces NOx below 200 °C, H2‐SCR‐DeNOx has gained attention in installations and plants with H2 availability. The catalytic properties and reaction mechanism of platinum‐based catalysts are given in detail. Also, Pd‐based catalysts are briefly reviewed. It is expected that the review will provide broad insights into the design and optimization of catalysts in the H2‐SCR‐DeNOx.

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Enhanced Catalytic Activity of Pd Supported on TiO₂ Nanowire for the H₂-SCR of NO_x in the Presence of Oxygen

Cited by 5 publications

References 52 publications

Pt Oxide Nanoclusters Supported on ZrP₂O₇ for Selective NO_x Reduction by H₂ in the Presence of O₂ with Negligible NH₃, N₂O, and NO₂ Byproducts

Pt Oxide Nanoclusters Supported on ZrP₂O₇ for Selective NO_x Reduction by H₂ in the Presence of O₂ with Negligible NH₃, N₂O, and NO₂ Byproducts

Structural Diversity Design, Four Nucleation Methods Growth and Mechanism of 3D Hollow Box TiO₂ Nanocrystals with a Temperature-Controlled High (001) Crystal Facets Exposure Ratio

Selective Catalytic Reduction of Nitrogen Oxides with Hydrogen (H₂‐SCR‐DeNO_x) over Platinum‐Based Catalysts

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Enhanced Catalytic Activity of Pd Supported on TiO2 Nanowire for the H2-SCR of NOx in the Presence of Oxygen

Cited by 5 publications

References 52 publications

Pt Oxide Nanoclusters Supported on ZrP2O7 for Selective NOx Reduction by H2 in the Presence of O2 with Negligible NH3, N2O, and NO2 Byproducts

Pt Oxide Nanoclusters Supported on ZrP2O7 for Selective NOx Reduction by H2 in the Presence of O2 with Negligible NH3, N2O, and NO2 Byproducts

Structural Diversity Design, Four Nucleation Methods Growth and Mechanism of 3D Hollow Box TiO2 Nanocrystals with a Temperature-Controlled High (001) Crystal Facets Exposure Ratio

Selective Catalytic Reduction of Nitrogen Oxides with Hydrogen (H2‐SCR‐DeNOx) over Platinum‐Based Catalysts

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Enhanced Catalytic Activity of Pd Supported on TiO₂ Nanowire for the H₂-SCR of NO_x in the Presence of Oxygen

Pt Oxide Nanoclusters Supported on ZrP₂O₇ for Selective NO_x Reduction by H₂ in the Presence of O₂ with Negligible NH₃, N₂O, and NO₂ Byproducts

Pt Oxide Nanoclusters Supported on ZrP₂O₇ for Selective NO_x Reduction by H₂ in the Presence of O₂ with Negligible NH₃, N₂O, and NO₂ Byproducts

Structural Diversity Design, Four Nucleation Methods Growth and Mechanism of 3D Hollow Box TiO₂ Nanocrystals with a Temperature-Controlled High (001) Crystal Facets Exposure Ratio

Selective Catalytic Reduction of Nitrogen Oxides with Hydrogen (H₂‐SCR‐DeNO_x) over Platinum‐Based Catalysts