Deactivation and regeneration of hopcalite catalyst for carbon monoxide oxidation: a review

Dey, Subhashish; Dhal, Ganesh Chandra

doi:10.1016/j.mtchem.2019.07.002

Cited by 44 publications

(33 citation statements)

References 78 publications

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“…In present work an attempt is made to determine the factors influencing the CO oxidation process on nanoscale structures obtained by hydrothermal reduction of metal salts. We have applied this approach to the oxidation of CO on copper-containing systems, which are most traditionally used in the process of deep CO oxidation, as well as because of the increased interest in recent years to its application in this reaction [13][14][15]. Earlier [16] we studied the mechanism of hydrothermal reduction of metal salts with the production of the Cu-Co-Al oxide system and showed the formation of hydroxyoxalates as intermediate synthesis products.…”

Section: Doimentioning

confidence: 99%

SYNTHESIS, CHARACTERISTIC AND ACTIVITY OF NANOSIZED Cu–Me (Me–Co, Zn, Ni) OXIDE SYSTEMS IN CO OXIDATION IN THE PRESENCE OF H2

Jafarova¹

2021

AChJ

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Nanooxides of Cu–Me composition (Me–Co, Zn, Ni) were synthesized by hydrothermal reduction of metal salts with subsequent calcination and the influence of their properties (size, morphology, structure) on catalytic activity of deep CO oxidation reaction in the presence of H2 was considered. The nanooxides have been characterized by XRD and SEM methods. It was revealed that particles of Cu–Co–O are nanoplates (30–35 nm), and Cu–Zn–O (12.5–20 nm) are nanorods. The SEM method revealed a higher structural organization of the Cu–Сo–O particles than Cu–Zn–O; the growth of nanocrystals is shown by varying the magnification of the scale grid of images. The highest activity of the Cu–Co–O system was found among the mentioned and corresponding individual oxides. The effect of metal (Cu/Co) ratio on the dispersibility and morphology of nanoparticles and their activity has been studied. The non-additive increase in activity is explained by the redox properties of cobalt oxides and the contribution of copper to electronic state of this element. The variation of composition, as well as high dispersibility (30–35 nm) make it possible to reduce the temperature of oxidation beginning (T50%) of CO to less than 1150C

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Section: Doimentioning

confidence: 99%

SYNTHESIS, CHARACTERISTIC AND ACTIVITY OF NANOSIZED Cu–Me (Me–Co, Zn, Ni) OXIDE SYSTEMS IN CO OXIDATION IN THE PRESENCE OF H2

Jafarova¹

2021

AChJ

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“…where, q reg and q orig are the adsorption capacities per unit of mass of the regenerated and the original adsorbent, respectively [140]. Dey and Dhal [97] found that the regeneration can restore the catalyst's active sites and brings the catalyst to its original state or one of even higher activity. The illustration of the regeneration of hopcalite catalysts after CO oxidation is presented in Figure 11.…”

Section: Regenerationmentioning

confidence: 99%

“…Reproduced with permission from Dey and Dhal [97]. Copyright 2019 Elsevier Ltd. [97].The mechanism involves O 2 adsorption to form O 2 * precursors, which split on a vicinal vacancy, while in the second mechanism, the O 2 activation occurs via the kinetically applicable CO*-assisted O 2 dissociation step without the specific concern of stable O 2 * precursors[97].…”

mentioning

confidence: 99%

Monolith Metal-Oxide-Supported Catalysts: Sorbent for Environmental Application

et al. 2020

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The emission of untreated environmental harmful gases such as sulfur and nitrogen oxide (SOx and NOx) emissions is considered old fashioned, since industries are compelled by governments and legislations to meet the minimum threshold before emitting such substances into the atmosphere. Numerous research has been done and is ongoing to come up with both cost-effective equipment and regenerable catalysts that are adsorbent—or with enhanced sorption capacity—and with safer disposal methods. This work presents the general idea of a monolith/catalyst for environmental application and the technicality for improving the surface area for fast and efficient adsorption–desorption reactions. The chemical reactions, adsorption kinetics, and other properties, including deactivation, regeneration, and the disposal of a catalyst in view of environmental application, are extensively discussed.

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“…Perovskite-type catalysts exhibit stable structures and a high processing temperature of approximately 350°C-550°C [7][8][9] In comparison, spinel-type catalysts display higher catalytic activity at low temperatures of approximately 200°C-400°C [10][11][12] However, catalysts of this type are easily deactivated, which poses challenges for long-term use of solid catalysts in industrial settings. [13] Zeng [14] synthesised a series of CuÀ Co spinel composite oxides by a facile, fast and green grinding-complexation approach. The resulting catalysts were applied in the catalytic oxidation of toluene.…”

Section: Introductionmentioning

confidence: 99%

Study on the Performance of Copper‐Manganese Composite Oxide Catalysts for Toluene

Yang

2021

ChemistrySelect

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Copper-manganese (CuMn) composite oxide catalysts were prepared for the catalytic combustion of a common volatile organic compound, namely toluene. The structural properties of the catalysts were analysed by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) theory, X-ray photoelectron spectroscopy (XPS) and hydrogen temperature-programmed reduction (H 2 -TPR). The catalytic stability was examined after 100 h. It was found that Cu 1 Mn 1 exhibited the highest catalytic ability when the molar ratio of Cu : Mn was 1 : 1. The removal of toluene reached 90 % at a temperature below 229°C. It was speculated that the Cu 1.5 Mn 1.5 O 4 spinel structure and CuO were formed in the catalyst. The catalyst surface area was not the main factor affecting the catalytic activity. The catalysts displayed good stability and maintained high catalytic activity for a long time. Notably, fresh catalysts contained high amounts of high-valent Mn 4 + and Cu 2 + cations, which played important roles in the catalytic combustion of toluene. The cations initiated the redox process and led to the conversion of toluene to CO 2 and H 2 O. The reduced lattice oxygen supplied from air was transformed into surface oxygen on the catalyst. The catalytic combustion of toluene in the presence of CuMn composite oxide catalysts followed the Mars-van Krevelen mechanism.

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Deactivation and regeneration of hopcalite catalyst for carbon monoxide oxidation: a review

Cited by 44 publications

References 78 publications

SYNTHESIS, CHARACTERISTIC AND ACTIVITY OF NANOSIZED Cu–Me (Me–Co, Zn, Ni) OXIDE SYSTEMS IN CO OXIDATION IN THE PRESENCE OF H2

SYNTHESIS, CHARACTERISTIC AND ACTIVITY OF NANOSIZED Cu–Me (Me–Co, Zn, Ni) OXIDE SYSTEMS IN CO OXIDATION IN THE PRESENCE OF H2

Monolith Metal-Oxide-Supported Catalysts: Sorbent for Environmental Application

Study on the Performance of Copper‐Manganese Composite Oxide Catalysts for Toluene

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