Interaction of SO2 with O2 over mixed Pt, Pd, Pt−Pd and Pt−Ru oxidation catalysts and combined treatment of automobile exhaust gases

Попова, Н. М.; Umbetkaliev, A. K.; Досумов, К.; Antonova, N. A.

doi:10.1007/bf02064740

Cited by 9 publications

(5 citation statements)

References 1 publication

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“…Popova et al investigated the SO 2 storage on Pt/Al 2 O 3 in the presence of oxygen with FTIR spectroscopy and found that SO 2 forms two types of sulfates bound to the metal and the support. 15 In the XRD of vehicle-aged diesel oxidation catalysts containing platinum and alumina as primary components, signals characteristic of crystalline Al 2 (SO 4 ) 3 were found, [6][7][8] which confirmed the results of these laboratory experiments. When aluminum sulfate was heated, it decomposed to alumina and SO 3 exclusively, which proved the reversibility of the storage reaction.…”

Section: Introductionsupporting

confidence: 70%

“…However, when SO 3 was used, high sulfur storage levels were reached comparable to the amounts stored in an experiment with SO 2 + O 2 and Pt/Al 2 O 3 . ,, Hammerle and Truex concluded from this result that SO 3 is the species responsible for sulfur storage on alumina. Popova et al investigated the SO 2 storage on Pt/Al 2 O 3 in the presence of oxygen with FTIR spectroscopy and found that SO 2 forms two types of sulfates bound to the metal and the support . In the XRD of vehicle-aged diesel oxidation catalysts containing platinum and alumina as primary components, signals characteristic of crystalline Al 2 (SO 4 ) 3 were found, − which confirmed the results of these laboratory experiments.…”

Section: Introductionmentioning

confidence: 66%

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Adsorption and Desorption of SO_xon Diesel Oxidation Catalysts

Kröcher¹,

Widmer²,

Elsener³

et al. 2009

Ind. Eng. Chem. Res.

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The deactivation of NO oxidation by SO 2 was studied with the use of commercial diesel oxidation catalysts (DOC) and Pt/Al 2 O 3 as reference material, coated on cordierite monolith. Despite their slightly different elemental compositions, the NO conversion rates of the fresh commercial catalysts were very similar. The maximum NO conversion was 38% at 350 °C, and above this temperature conversion started to be limited by the thermodynamics of the reaction. The rates of NO conversion strongly decreased with the start of SO 2 dosing. For analysis of SO 2 conversion and uptake, SO 2 and SO 3 /H 2 SO 4 were determined separately in the gas phase by absorption and titration. Under typical exhaust gas conditions (1 ppm SO 2 , 250 °C), the catalysts functioned as sulfur traps and stored a large part of the emitted SO 2 . The SO x storage was divided into two phases: a fast saturation of the catalyst surface with sulfuric acid, which hampered NO conversion, and a slow, long-lasting sulfation of the washcoat. The storage capacities of the oxidation catalysts reached their maxima at 250 °C due to the temperature dependency of sulfur adsorption and desorption. Adsorbed sulfuric acid desorbed between 350 and 400 °C, whereas more stable compounds, such as aluminum sulfate, were decomposed at higher temperatures. Deactivated catalysts could be completely regenerated within a few minutes at temperatures above 350 °C. However, repeated or lengthier thermal treatments resulted in a reduced sulfur storage capacity and irreversible activity losses for NO oxidation due to a reduction of the active surface by sintering.

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Section: Introductionsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 66%

Adsorption and Desorption of SO_xon Diesel Oxidation Catalysts

Kröcher¹,

Widmer²,

Elsener³

et al. 2009

Ind. Eng. Chem. Res.

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“…Sulfur is present in fuel as a wide range of organic compounds, which are converted in the engine to SO 2 , CO 2 , H 2 O, and particulates. During the treatment of exhaust gases, their contacts to the catalyst are affected by poisoning, in particular, for SO 2 [3]. Water was shown to act as a strong inhibitor on the catalytic activity in the oxidation reaction [4].…”

Section: Introductionmentioning

confidence: 98%

The role of doped Fe on the activity of alumina-supported Pt and Pd diesel exhaust catalysts

et al. 2011

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Supported Pt and Pd are most commonly used for oxidation catalysts. They have similar and different characteristics for deactivation factors. The catalytic activity of Pt and Pd catalysts supported on c-Al 2 O 3 was studied in the presence and absence of H 2 O and SO 2 during CO oxidation under simulated conditions of diesel exhaust gas. Without the addition of H 2 O and SO 2 to the feed gas, Pd/Al 2 O 3 had a superior catalytic activity compared to Pt/Al 2 O 3 . The addition of H 2 O to the feed gas strongly and negligibly affected the activity of Pd and Pt, respectively, while the addition of SO 2 to the feed gas had a strong poisoning effect on the catalytic activity of both Pt and Pd catalysts. Although being the most active, Pd catalysts exhibited a strong sensitivity to water and sulfur-containing compounds. Fe was added to the Pt and Pd catalysts to introduce sulfur resistance. The addition of Fe enhanced the activity of the catalysts by suppressing the phase transition of Al 2 O 3 to Al 2 (SO 4 ) 3 and by hindering metal sintering.

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“…20 SO 2 is an oxide gas of SF 6 that exists in very small amounts in sources such as automobile exhaust, aged wine, and the general air. [27][28][29] It is regulated at a few parts per million (ppm) for time-weighted average exposure standard and short-term exposure standard based on the degree of harm to the human body. 30 In the case of GIS, 1-12 ppm is considered a criterion for insulation deterioration, and various sensors have been developed to measure it.…”

Section: Introductionmentioning

confidence: 99%

“…SO 2 is an oxide gas of SF 6 that exists in very small amounts in sources such as automobile exhaust, aged wine, and the general air 27–29 . It is regulated at a few parts per million (ppm) for time‐weighted average exposure standard and short‐term exposure standard based on the degree of harm to the human body 30 .…”

Section: Introductionmentioning

confidence: 99%

Digital colorimetric sensing for real‐time gas monitoring for smart green energy system

Cho

Dutta

Kwak

et al. 2023

EcoMat

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In this study, we demonstrate that a digital colorimetric sensor platform can transform a conventional energy system, such as gas‐insulated switchgear (GIS) into a smart green energy system. Our sensor platform consists of a colorimetric sensor film (CSF), an array of silicon photodiodes, and a low‐power‐driven fiber optical photodiode with a wireless communication protocol integrated into an information network. The photodiode measures the transmitted light of the color‐variable CSF when exposed to sulfur dioxide (SO2) gas, a decomposition by‐product of the sulfur hexafluoride (SF6) gas in GIS. We report the electrical photocurrent measurement through the CSF can measure the concentration of SO2 gas via remote and real‐time monitoring and shows a comparable behavior to UV–Vis absorption measurement. The limit of detection of the sensor, 0.78 ppm is sufficient to analyze the GIS insulation deterioration allowing green energy systems.image

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Interaction of SO2 with O2 over mixed Pt, Pd, Pt−Pd and Pt−Ru oxidation catalysts and combined treatment of automobile exhaust gases

Cited by 9 publications

References 1 publication

Adsorption and Desorption of SO_xon Diesel Oxidation Catalysts

Adsorption and Desorption of SO_xon Diesel Oxidation Catalysts

The role of doped Fe on the activity of alumina-supported Pt and Pd diesel exhaust catalysts

Digital colorimetric sensing for real‐time gas monitoring for smart green energy system

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Interaction of SO2 with O2 over mixed Pt, Pd, Pt−Pd and Pt−Ru oxidation catalysts and combined treatment of automobile exhaust gases

Cited by 9 publications

References 1 publication

Adsorption and Desorption of SOxon Diesel Oxidation Catalysts

Adsorption and Desorption of SOxon Diesel Oxidation Catalysts

The role of doped Fe on the activity of alumina-supported Pt and Pd diesel exhaust catalysts

Digital colorimetric sensing for real‐time gas monitoring for smart green energy system

Contact Info

Product

Resources

About

Adsorption and Desorption of SO_xon Diesel Oxidation Catalysts

Adsorption and Desorption of SO_xon Diesel Oxidation Catalysts