Insight into the Role of Electropositive Promoters in Emission Control Catalysis: An In Situ DRIFTS Study of NO Reduction by C3H6 Over Na-Promoted Pt/Al2O3 Catalysts

Konsolakis, Michalis; Yentekakis, I.V.

doi:10.1007/s11244-013-9947-y

Cited by 13 publications

(11 citation statements)

References 29 publications

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“…Considering the high catalytic capacity of platinum described above, it is expedient to conduct studies taking into account the surface of the enthrakometer and its catalytic properties. Considering the growing interest in the catalysis on platinum surfaces, including the most exotic forms [29][30][31][32][33][34][35] and excluding the well-known examples [36,37], it becomes possible to use platinum enthrakometers to study the formation of intermetallides, the electrochemical synthesis of organometallic compounds, adducts, etc. Considering the emergence of self-oscillations in a number of reactions in the gaseous phase on the platinum surface [38][39][40][41][42][43], the use of platinum enthrakometers under gas flow in a multiphase catalytic cell allows one to speak about an "autowave" or "self-oscillating" catalymetry on the surface of an enthrakometer under microwave irradiation.…”

Section: From Mw-polarography To "Autowave" and "Self-oscillating"mentioning

confidence: 99%

Microwave Enthrakometric Labs-On-A-Chip and On-Chip Enthrakometric Catalymetry: From Non-Conventional Chemotronics Towards Microwave-Assisted Chemosensors

Градов

Gradova

2019

Chemosensors

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A unique chemical analytical approach is proposed based on the integration of chemical radiophysics with electrochemistry at the catalytically-active surface. This approach includes integration of: radiofrequency modulation polarography with platinum electrodes, applied as film enthrakometers for microwave measurements; microwave thermal analysis performed on enthrakometers as bolometric sensors; catalytic measurements, including registration of chemical self-oscillations on the surface of a platinum enthrakometer as the chemosensor; measurements on the Pt chemosensor implemented as an electrochemical chip with the enthrakometer walls acting as the chip walls; chemotron measurements and data processing in real time on the surface of the enthrakometric chip; microwave electron paramagnetic resonance (EPR) measurements using an enthrakometer both as a substrate and a microwave power meter; microwave acceleration of chemical reactions and microwave catalysis оn the Pt surface; chemical generation of radio- and microwaves, and microwave spin catalysis; and magnetic isotope measurements on the enthrakometric chip. The above approach allows one to perform multiparametric physical and electrochemical sensing on a single active enthrakometric surface, combining the properties of the selective electrochemical sensor and an additive physical detector.

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Section: From Mw-polarography To "Autowave" and "Self-oscillating"mentioning

confidence: 99%

Microwave Enthrakometric Labs-On-A-Chip and On-Chip Enthrakometric Catalymetry: From Non-Conventional Chemotronics Towards Microwave-Assisted Chemosensors

Градов

Gradova

2019

Chemosensors

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“…Automobile exhaust is a major cause of air pollution [1,2] . Vehicle exhaust is complex and contains hundreds of different compounds, monoxide (CO), hydrocarbon (HC) and nitric oxide (NOX) are the main causes of air pollution [3][4][5] .Three-way catalysts (TWCs) are one of the most important technologies for automotive emission control [6,7] . TWCs can work simultaneously and efficiently to reduce NO and to oxidize CO and hydrocarbons at the theoretical air/fuel (A/F) ratio of around 14.6.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Fe-containing Mesoporous HZSM-5 Catalysts for Automotive Exhaust Cleaning

Liang¹,

Gu²,

Zhuang³

et al. 2018

Proceedings of the 2018 7th International Conference on Energy and Environmental Protection (ICEEP 2018)

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Mesoporous HZSM-5was prepared by alkali solution treating microporous HZSM-5, then Fe/ZSM-5 catalysts have been successfully fabricated by equal volume impregnation method. Their texture structure, crystal phase structure and acidity were characterized by N2 physisorption /desorption, XRD, SEM and NH3-TPD techniques. The results show that mesoporous surface area and mesoporous pore volume of the ZSM-5 after alkali treatment increased obviously from 77m 2 /g and 0.086cm 3 /g to 192m 2 /g and 0.326cm 3 /g respectively. XRD patterns show the crystallinity of the zeolite treated by alkali decreased gradually with the increase of alkali concentration. The XRD patterns of the FeCl3/ZSM-5 samples show that the high FeCl3 dispersion in the zeolites treated by alkali. All zeolites have the MFI framework topology. When Fe-ZSM-5 is used as catalyst for cleaning auto-exhaust, the catalytic effect of mesoporous molecular sieve loaded with FeCl3 is more active than HZSM-5.

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“…[1][2][3] Classical components of TWCs usually include Rh, Pt and/or Pd as active metals, and ceria-zirconia solid solution (CZ) as a promoter due to its outstanding oxygen storage capacity (OSC). [1][2][3] Classical components of TWCs usually include Rh, Pt and/or Pd as active metals, and ceria-zirconia solid solution (CZ) as a promoter due to its outstanding oxygen storage capacity (OSC).…”

Section: Introductionmentioning

confidence: 99%

“…Three-way catalysts (TWCs) have been widely used to control automotive exhaust emissions, and catalytic conversion has been proven to be a well-established technology for the abatement of CO, HC and NO x (NO and NO 2 ) simultaneously in a narrow window near the stoichiometric air-to-fuel ĲA/F) ratio. [1][2][3] Classical components of TWCs usually include Rh, Pt and/or Pd as active metals, and ceria-zirconia solid solution (CZ) as a promoter due to its outstanding oxygen storage capacity (OSC). [4][5][6] In recent years, CeO 2 -ZrO 2 -supported Pd-only catalysts have been studied with great interest because of their low cost and high catalytic activity for HC oxidation.…”

Section: Introductionmentioning

confidence: 99%

Insights into the role of a structural promoter (Ba) in three-way catalyst Pd/CeO₂–ZrO₂ using in situ DRIFTS

Yang

Sha

et al. 2015

Catal. Sci. Technol.

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A series of Pd/CeO 2 -ZrO 2 (Pd/CZ) catalysts modified with barium oxide with different contents were prepared and characterized by XRD, BET, XPS, H 2 -TPR and NO x adsorption/desorption-MS. In particular, the effect of a structural promoter (Ba) on the catalytic and surface behaviour was investigated by means of in situ DRIFTS. Doped Ba enters into the CeO 2 lattice, and thus results in the formation of more homogenous Ce-Zr-Ba ternary solid solution, which enhances the textural/structural thermostability and NO x storage efficiency of the catalysts. DRIFTS results indicate that the introduction of Ba weakens the strong adsorption of HC reactants on the surface of the catalysts. Furthermore, the addition of Ba accelerates the dissociation of NO and facilitates the formation of intermediates (NCO and CN) due to the outstanding electron-donating ability of Ba. Therefore, the Ba modified catalysts present much higher catalytic activity for HC and NO x conversions compared with Pd/CZ. However, the addition of Ba inhibits the oxidation of CO at low temperatures resulting from the decreased amount of active sites. In addition, the NO x operation window is widened with increasing Ba content due to the enhanced NO x storage capacity. † Electronic supplementary information (ESI) available: The BJH pore size distribution of fresh and aged catalysts, and the in situ DRIFTS spectra of Pd/ CZB3 and Pd/CZB9 catalysts under simulated reaction conditions. See

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Insight into the Role of Electropositive Promoters in Emission Control Catalysis: An In Situ DRIFTS Study of NO Reduction by C3H6 Over Na-Promoted Pt/Al2O3 Catalysts

Cited by 13 publications

References 29 publications

Microwave Enthrakometric Labs-On-A-Chip and On-Chip Enthrakometric Catalymetry: From Non-Conventional Chemotronics Towards Microwave-Assisted Chemosensors

Microwave Enthrakometric Labs-On-A-Chip and On-Chip Enthrakometric Catalymetry: From Non-Conventional Chemotronics Towards Microwave-Assisted Chemosensors

Preparation and Characterization of Fe-containing Mesoporous HZSM-5 Catalysts for Automotive Exhaust Cleaning

Insights into the role of a structural promoter (Ba) in three-way catalyst Pd/CeO₂–ZrO₂ using in situ DRIFTS

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Insight into the Role of Electropositive Promoters in Emission Control Catalysis: An In Situ DRIFTS Study of NO Reduction by C3H6 Over Na-Promoted Pt/Al2O3 Catalysts

Cited by 13 publications

References 29 publications

Microwave Enthrakometric Labs-On-A-Chip and On-Chip Enthrakometric Catalymetry: From Non-Conventional Chemotronics Towards Microwave-Assisted Chemosensors

Microwave Enthrakometric Labs-On-A-Chip and On-Chip Enthrakometric Catalymetry: From Non-Conventional Chemotronics Towards Microwave-Assisted Chemosensors

Preparation and Characterization of Fe-containing Mesoporous HZSM-5 Catalysts for Automotive Exhaust Cleaning

Insights into the role of a structural promoter (Ba) in three-way catalyst Pd/CeO2–ZrO2 using in situ DRIFTS

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Insights into the role of a structural promoter (Ba) in three-way catalyst Pd/CeO₂–ZrO₂ using in situ DRIFTS