CuO/CeO 2  based monoliths for CO preferential oxidation in H 2 -rich streams

Barbato, Paola Sabrina; Benedetto, Almerinda Di; Landi, Gianluca; Lisi, L.

doi:10.1016/j.cej.2015.05.079

Cited by 36 publications

(27 citation statements)

References 40 publications

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“…Even if the difference among the performance of the samples is measurable, the effect of the copper load is marginal for the best catalysts. Similarly, Du et al [64] detected an improvement of the catalytic performance only at low copper content, with further increase of the Cu load not providing higher conversion (a poor effect on the selectivity was detectable). Nevertheless, a surprisingly opposite trend was observed for xCuCe catalysts at similar contact time, suggesting that additional and even more active copper sites are dispersed on nanometric ceria at higher copper loads.…”

Section: Samplementioning

confidence: 99%

“…Activity tests ( Figure 5) were performed under the same reaction conditions used in our previous works [15,17,21,54,64] in order to compare catalysts, i.e., in the absence of CO2 and H2O and at contact time, defined as catalyst weight divided by total flow rate (W/F), equal to 0.054 g·s·cm −3 . As for TPR analysis, performance of 4% CuO/CeO2 catalyst reported in [15] has been also reported as a reference.…”

Section: Activity Testsmentioning

confidence: 99%

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Improved CO-PROX Performance of CuO/CeO2 Catalysts by Using Nanometric Ceria as Support

2018

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Abstract:Despite of the huge number of papers about the catalytic preferential oxidation of CO (CO-PROX) for the purification of H 2 streams, there is still a need for more effective catalysts in order to reduce the large required catalyst volume of CO-PROX unity. In this work, large surface area nanometric ceria was used as support for CuO/CeO 2 catalysts with CuO load up to 10 wt % easily dispersed by wet impregnation. Catalysts were characterized by ICP-MS, XRD, SEM/EDS, N 2 physisorption, H 2 temperature programmed reduction (TPR), and CO 2 temperature programmed desorption (TPD) and tested under different reaction conditions (including under feed containing inhibiting species such as CO 2 and H 2 O). Catalytic tests revealed that our samples show high activity and selectivity even under stringent reaction conditions; moreover, they result among the most active catalysts when compared to those reported in the scientific literature. The high activity can be related to the enhanced amount of highly dispersed copper sites in strong interaction with ceria related to the nature of the nanometric support, as evidenced by the characterization techniques. Despite the high concentration of active copper sites, catalytic performance is limited by CO 2 desorption from ceria in the neighborhood of copper sites, which prevents a further improvement. This suggests that new catalyst formulations should also provide a lower affinity towards CO 2 .

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Section: Samplementioning

confidence: 99%

Section: Activity Testsmentioning

confidence: 99%

Improved CO-PROX Performance of CuO/CeO2 Catalysts by Using Nanometric Ceria as Support

2018

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“…On the other hand, a modified dip-coating procedure for copper-ceria on a cordierite monolith can lead to a better adhesion and catalytic performance than the powder catalyst [292]. Modification of the authors' previous method for coating [293] led to a larger fraction of smaller ceria particles, which probably improved the washcoat adherence. The catalytic performance in this work, however, was assessed in the absence of H 2 O/CO 2 .…”

Section: Preferential Oxidation Of Carbon Monoxidementioning

confidence: 99%

“…In addition, coating monoliths by solution-combustion synthesis has given materials with good catalytic performance for the PrOx reaction in the presence of H 2 O and CO 2 [295,296]. Other properties that should be optimized to enhance the performance of copper/ceria monolithic catalysts include the coating thickness [297] and cell density of the structure [293].…”

Section: Preferential Oxidation Of Carbon Monoxidementioning

confidence: 99%

Monoliths: A Review of the Basics, Preparation Methods and Their Relevance to Oxidation

2017

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Considerable research has been conducted on monolithic catalysts for various applications. Strategies toward coating monoliths are of equal interest and importance. In this paper, the preparation of monoliths and monolithic catalysts have been summarized. More specifically, a brief explanation for the manufacturing of ceramic and metallic monoliths has been provided. Also, different methods for coating γ-alumina, as a secondary support, are included. Techniques used to deposit metal-based species, zeolites and carbon onto monoliths are discussed. Furthermore, monoliths extruded with metal oxides, zeolites and carbon are described. The main foci are on the reasoning and understanding behind the preparation of monolithic catalysts. Ideas and concerns are also contributed to encourage better approaches when designing these catalysts. More importantly, the relevance of monolithic structures to reactions, such as the selective oxidation of alkanes, catalytic combustion for power generation and the preferential oxidation of carbon monoxide, has been described.

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“…Catalytic oxidation of carbon monoxide (CO) has drawn much research attention due to its significance in fundamental research and practical applications in pollution air purification, vehicle exhaust removal, and CO preferential oxidation in hydrogen-rich gas [1][2][3][4][5]. Noble metal catalysts, including supported Au, Pd, Pt, etc., exhibit excellent CO oxidation activity [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Thermal Activation of CuBTC MOF for CO Oxidation: The Effect of Activation Atmosphere

Zhang

Zhan

et al. 2017

Catalysts

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High performance catalysts for carbon monoxide (CO) oxidation were obtained through thermal activation of a CuBTC (BTC: 1,3,5-benzenetricarboxylic acid) metal-organic framework (MOF) in various atmospheres. X-ray diffraction (XRD), X-ray photonelectron spectroscopy (XPS), N 2 adsorption-desorption measurement, and field emission scanning electron microscopy (FESEM) were adopted to characterize the catalysts. The results show that thermal activation by reductive H 2 may greatly destroy the structure of CuBTC. Inert Ar gas has a weak influence on the structure of CuBTC. Therefore, these two catalysts exhibit low CO oxidation activity. Activating with O 2 is effective for CuBTC catalysts, since active CuO species may be obtained due to the slight collapse of CuBTC structure. The highest activity is obtained when activating with CO reaction gas, since many pores and more effective Cu 2 O is formed during the thermal activation process. These results show that the structure and chemical state of coordinated metallic ions in MOFs are adjustable by controlling the activation conditions. This work provides an effective method for designing and fabricating high performance catalysts for CO oxidation based on MOFs.

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CuO/CeO 2 based monoliths for CO preferential oxidation in H 2 -rich streams

Cited by 36 publications

References 40 publications

Improved CO-PROX Performance of CuO/CeO2 Catalysts by Using Nanometric Ceria as Support

Improved CO-PROX Performance of CuO/CeO2 Catalysts by Using Nanometric Ceria as Support

Monoliths: A Review of the Basics, Preparation Methods and Their Relevance to Oxidation

Thermal Activation of CuBTC MOF for CO Oxidation: The Effect of Activation Atmosphere

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