Catalytic removal of carbon monoxide over carbon supported palladium catalyst

Srivastava, Avanish Kumar; Saxena, Amit; Shah, Dilip; Mahato, T.H.; Singh, Beer; Shrivastava, Anchal Roy; Gutch, P. K.; Shinde, Chandrakant P.

doi:10.1016/j.jhazmat.2012.10.001

Cited by 18 publications

(11 citation statements)

References 33 publications

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“…7 The Pd/C catalysts are normally prepared by chemical reduction methods using formaldehyde or NaBH 4 as the reducing chemicals, which are not environmentally friendly. In addition, they require additional washing and drying steps for removing the organic reagents and the adsorbed water, which decrease the catalytic activity of the dry Pd/C catalysts.…”

Section: Introductionmentioning

confidence: 99%

Dry plasma reduction to prepare a high performance Pd/C catalyst at atmospheric pressure for CO oxidation

et al. 2014

J. Mater. Chem. A

112

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A high performance Pd/C catalyst (Pd/C-PC) was successfully prepared by simple incipient wetness impregnation followed by the process of dry plasma reduction and calcination. Oxygen-containing group surface-fuctionalized activated carbon was used to absorb the palladium precursor PdCl 4 2À , and small sized (1.92 AE 0.75 nm) Pd nanoparticles were formed in Pd/C-PC, which were smaller than those prepared by low pressure cold plasma (4.0-4.5 nm). The results of XRD, XPS, TPR and TEM showed that dry plasma with calcination could completely remove the residual Cl À ions and obtain predominantly metallic Pd nanoparticles without aggregation. The dry plasma prepared Pd/C-PC catalyst gave excellent catalytic activity for CO oxidation, and the TOF value for 5 wt% Pd/C-PC was about 6.1 times as that for 6 wt% Pd/graphene prepared by the conventional impregnation and hydrogen reduction method. The high performance was attributed to the smaller size and predominantly metallic Pd nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Dry plasma reduction to prepare a high performance Pd/C catalyst at atmospheric pressure for CO oxidation

et al. 2014

J. Mater. Chem. A

112

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“…The Pd supported activated carbon catalyst (Pd/C) with a total Pd loading of 6.5 � 0.5 % was prepared by incipient wetness impregnation method. [53] In this method, the support was treated with a volume of metal salt solution which is equal to the water adsorption capacity of the support, determined by exposing the support to water overnight at room temperature. [54] The reduction of Pd is then carried out in liquid media using different reducing agents; HCHO, green tea, ascorbic acid, and NaBH 4 .…”

Section: Preparation Of the Catalystsmentioning

confidence: 99%

“…[55] Granular activated carbon functionalized with 10 % HNO 3 (GAC-Acid) is used for Pd impregnation. [53] Functionalization is done to incorporate oxygen-containing acidic functional groups on the surface of GAC thereby increasing the hydrophilicity of the support which will, in turn, help in the uniform distribution of metal particles. For this, 100 g of coconut shell based GAC was treated with 10 % HNO 3 at~60°C for 8 hrs.…”

Section: Preparation Of the Catalystsmentioning

confidence: 99%

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An Experimental and Theoretical Investigation on the Oxidation of CO over Pd/C Derived from the Spent Pd Catalyst

et al. 2021

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Development of novel materials and methodologies for removal of toxic and poisonous carbon monoxide (CO) gas is important to solve serious health and environmental related problems. Existing materials used for the removal of CO gas are quite expensive and therefore, the synthesis of low‐cost and earth‐abundant catalyst for CO oxidation is urgently needed. In the present work, we report the preparation of Pd nanoparticles loaded on porous carbon supports from the spent Pd/C and the subsequent catalytic oxidation of CO. Different Pd based catalysts are prepared by using various reducing agents with different reduction potential such as formaldehyde, green tea, ascorbic acid, and sodium borohydride. The prepared catalysts are characterized and employed for the oxidation of CO. All the prepared catalysts show excellent activity towards CO oxidation at room temperature either in presence or absence of moisture depending on the Pd0/Pd+2 ratio in Pd/C which follows the order Pd/C−NaBH4>Pd/C−HCHO>Pd/C−Ascorbic acid>Pd/C−Green tea. Experimental findings of the present work also reveal that depending on the oxidation state, and moisture plays a critical role in Pd catalytic properties on the oxidation of CO. Theoretical calculations performed using Vienna ab initio Simulation Package (VASP) support the experimental observations and further confirm that the reaction proceeds through Langmuir‐Hinshelwood mechanism.

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“…The CO oxidation over Pd catalyst is structure-sensitive reaction, and structural change as shown in the Fig. 6, induced by the thermal treatment, is the main cause for improvement in the activity (Srivastava et al 2012). The linear CO is produced on low coordinated Pd atoms, while the smaller particles constantly expose at a larger fraction of low coordinated atoms than the larger ones.…”

Section: Property and Structure Of Various Palladium Oxide Catalystsmentioning

confidence: 99%

Highly Active Palladium Nanocatalysts for Low-Temperature Carbon Monoxide Oxidation

Dey

Dhal

2019

Polytechnica

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The noble metal catalysts are most commonly considered to be used in an automobile as a catalytic converter. Palladium (Pd) is a highly active catalyst for carbon monoxide (CO) oxidation in platinum group metals. It is very active for low-temperature CO oxidation if dispersed on suitable metal oxides and composite oxides. The oxidized Pd metal nanocatalyst has been applied more actively than the completely reduced particles. The performance of Pd oxide nanocatalysts strongly depends upon the surface structure, number of active sites and various Pd-O interactions. Palladium is an ideal catalyst not only for the automobile industry through cross-coupling reactions but also for low-temperature catalytic oxidation of CO. The Pd metal is more resistant for sulfur and potassium poisoning, and they are chemically sensitive and degraded rapidly in the presence of fuel impurities. The higher activity of Pd nanocatalyst was attributed to the small particle size and higher dispersion over Pd support. The chemisorptions of CO on Pd catalysts were studied in this review. The results obtained from this study will provide the scientific basis for the future design of Pd-based oxidation catalysts.

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Catalytic removal of carbon monoxide over carbon supported palladium catalyst

Cited by 18 publications

References 33 publications

Dry plasma reduction to prepare a high performance Pd/C catalyst at atmospheric pressure for CO oxidation

Dry plasma reduction to prepare a high performance Pd/C catalyst at atmospheric pressure for CO oxidation

An Experimental and Theoretical Investigation on the Oxidation of CO over Pd/C Derived from the Spent Pd Catalyst

Highly Active Palladium Nanocatalysts for Low-Temperature Carbon Monoxide Oxidation

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