Design of Pd-based pseudo-binary alloy catalysts for highly active and selective NO reduction

Jeon, Jaewan; Kon, Kenichi; Toyao, Takashi; Shimizu, Ken‐ichi; Furukawa, Shinya

doi:10.1039/c8sc05496g

Cited by 52 publications

(65 citation statements)

References 76 publications

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“…3b), highlighting the outstanding performance of the single-atom alloy catalyst. We also tested the long-term stability of Cu 5 Pd/Al 2 O 3 in NO reduction by CO under standard conditions (GHSV ¼ 40 000 h À1 ), where 100% C N 2 was maintained at 175 C. Although a number of bimetallic catalysts for NO reduction have been reported thus far, [12][13][14][15][16][42][43][44][45][46][47][48] to the best of our knowledge, the present work represents the rst success in complete NO x removal at a temperature less than 200 C. At 150 C, although C N 2 decreased slightly at the initial stage because of N 2 O formation, it recovered aer a short H 2 treatment. This result implies that the accumulation of oxygen species at the catalyst surface triggers the loss of N 2 selectivity and that the catalytic performance could be recovered under rich conditions.…”

Section: Resultsmentioning

confidence: 99%

“…5 Platinum-group metals (PGMs) such as Pt, Pd, and Rh are known to be efficient catalysts for the reduction of NO using CO, 6,7 H 2 , 8 NH 3 , 9 and hydrocarbons 10 as reductants. The recent challenges in this eld involve developing catalytic systems that function (1) at low temperatures under cold-start conditions, 11 (2) with minimum use of PGMs, 12,13 and (3) without emitting N 2 O, [14][15][16] which is a potent greenhouse gas. 17 These issues have been individually studied using different materials.…”

Section: Introductionmentioning

confidence: 99%

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A Cu–Pd single-atom alloy catalyst for highly efficient NO reduction

et al. 2019

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Cu–Pd single-atom alloy catalyst for highly efficient NO reduction

et al. 2019

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“…It has been reported that the adsorption of NO and subsequent cleavage of the N−O bond are the determining factors in the CO+NO reaction [10,40–42] . Therefore, the adsorption and dissociation behaviors of NO on Ir/non‐m‐WO 3 , Ir 1 /m‐WO 3 , and Ir NPs/m‐WO 3 were further investigated using the NO‐TPD technique (Figure 9).…”

Section: Resultsmentioning

confidence: 99%

Single Ir Atoms Anchored on Ordered Mesoporous WO₃ Are Highly Efficient for the Selective Catalytic Reduction of NO with CO under Oxygen‐rich Conditions

Jiang

Liu

et al. 2021

ChemCatChem

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Under oxygen‐rich conditions, achieving a selective and efficient reduction of NO by CO is always challenging. Here, we report the synthesis of the catalyst consisting of single Ir atoms anchored on mesoporous WO3 (denoted as Ir1/m‐WO3) using a facile template method followed by wet impregnation. X‐ray diffraction and transmission electron microscope studies indicated that the Ir atoms were distributed uniformly on the internal surface of m‐WO3. When tested for the reduction of NO by CO, the Ir1/m‐WO3 catalyst with a low Ir loading of 0.28 wt % exhibited excellent catalytic performance in the presence of 2 vol % O2 (volume ratio of CO to O2 being 1 : 10), achieving a NO conversion of 73 % and N2 selectivity of 100 % at 350 °C. In particular, its turnover frequency (TOF) value reached 0.30 s−1 at 200 °C, which is six times higher than that of the catalyst with Ir nanoparticles supported on mesoporous WO3 (0.05 s−1). The superior catalytic performance of Ir1/m‐WO3 is attributed to the formation of the isolated Ir atoms and the more newly generated Ir‐WO3 interfaces that can promote the adsorption and activation of NO, and the presence of accessible mesopores in m‐WO3 that facilitates the mass transfer of NO and CO. This study brings a new fundamental understanding of active sites in Ir‐based catalysts for the CO+NO reaction and provides a new way to the design and synthesis of single‐atom catalysts, especially precious metal catalysts for emissions control.

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“…PGMs have been proven efficient catalysts for SCR of NO in the presence of reducing agents, such as CO, H2, NH3, and HC. However, proper SCR is still challenging as it requires the development of catalysts characterized by: (i) good low-temperature catalytic activity, (ii) minimum use of PGMs, and (iii) elevated N2 selectivity and low N2O production [118,119]. Nevertheless, the simultaneous resolution of these issues remains very difficult.…”

Section: Nox Reduction Reactionmentioning

confidence: 99%

Single-atom site catalysts for environmental catalysis

et al. 2020

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In recent decades, the environmental protection and long-term sustainability have become the focus of attention due to the increasing pollution generated by the intense industrialization. To overcome these issues, environmental catalysis has increasingly been used to solve the negative impact of pollutants emission on the global environment and human health. Supported platinum-metal-group (PGM) materials are commonly utilized as the state-of-the-art catalysts to eliminate gaseous pollutants but large quantities of PGMs are required. By comparison, single-atom site catalysts (SACs) have attracted much attention in catalysis owing to their 100% atom efficiency and unique catalytic performances towards various reactions. Over the past decade, we have witnessed burgeoning interests of SACs in heterogeneous catalysis. However, to the best of our knowledge, the systematic summary and analysis of SACs in catalytic elimination of environmental pollutants has not yet been reported. In this paper, we summarize and discuss the environmental catalysis applications of SACs. Particular focus was paid to automotive and stationary emission control, including model reaction (CO oxidation, NO reduction and hydrocarbon oxidation), overall reaction (three-way catalytic and diesel oxidation reaction), elimination of volatile organic compounds (formaldehyde, benzene, and toluene), and removal/decomposition of other pollutants (Hg 0 and SO 3). Perspectives related to further challenges, directions and design strategies of single-atom site catalysts in environmental catalysis were also provided.

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Design of Pd-based pseudo-binary alloy catalysts for highly active and selective NO reduction

Abstract: Drastic tuning of NO reduction activity and N2 selectivity based on the catalyst design with pseudo-binary alloy structures.

Cited by 52 publications

References 76 publications

A Cu–Pd single-atom alloy catalyst for highly efficient NO reduction

A Cu–Pd single-atom alloy catalyst for highly efficient NO reduction

Single Ir Atoms Anchored on Ordered Mesoporous WO₃ Are Highly Efficient for the Selective Catalytic Reduction of NO with CO under Oxygen‐rich Conditions

Single-atom site catalysts for environmental catalysis

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Design of Pd-based pseudo-binary alloy catalysts for highly active and selective NO reduction

Abstract: Drastic tuning of NO reduction activity and N2 selectivity based on the catalyst design with pseudo-binary alloy structures.

Cited by 52 publications

References 76 publications

A Cu–Pd single-atom alloy catalyst for highly efficient NO reduction

A Cu–Pd single-atom alloy catalyst for highly efficient NO reduction

Single Ir Atoms Anchored on Ordered Mesoporous WO3 Are Highly Efficient for the Selective Catalytic Reduction of NO with CO under Oxygen‐rich Conditions

Single-atom site catalysts for environmental catalysis

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Single Ir Atoms Anchored on Ordered Mesoporous WO₃ Are Highly Efficient for the Selective Catalytic Reduction of NO with CO under Oxygen‐rich Conditions