Effect of crystallinity on the catalytic performance of amorphous Co–B particles prepared from cobalt nitrate and potassium borohydride in the cinnamaldehyde hydrogenation

Tong, Dong Ge; Chu, Wei; Luo, Yongyue; Ji, Xiaoling; He, Yi

doi:10.1016/j.molcata.2006.10.032

Cited by 38 publications

(15 citation statements)

References 8 publications

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“…respectively, compared to DC at 7 h. Previously, high crystallinity has been shown to be an important feature of heterogeneous nanocatalysts that enhances catalytic properties in a wide range of reactions [86][87][88]. Thus, the increasing amount of amorphous regions in Cu/CuO composites demonstrated in Figure 1 and Figure 3 has a negative impact on the catalytic performance; a similar effect has recently been detailed in [89].…”

Section: Assessment Of Catalytic Activitysupporting

confidence: 61%

Cu/CuO Composite Track-Etched Membranes for Catalytic Decomposition of Nitrophenols and Removal of As(III)

et al. 2020

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One of the promising applications of nanomaterials is to use them as catalysts and sorbents to remove toxic pollutants such as nitroaromatic compounds and heavy metal ions for environmental protection. This work reports the synthesis of Cu/CuO-deposited composite track-etched membranes through low-temperature annealing and their application in catalysis and sorption. The synthesized Cu/CuO/poly(ethylene terephthalate) (PET) composites presented efficient catalytic activity with high conversion yield in the reduction of nitro aryl compounds to their corresponding amino derivatives. It has been found that increasing the time of annealing raises the ratio of the copper(II) oxide (CuO) tenorite phase in the structure, which leads to a significant increase in the catalytic activity of the composites. The samples presented maximum catalytic activity after 5 h of annealing, where the ratio of CuO phase and the degree of crystallinity were 64.3% and 62.7%, respectively. The catalytic activity of pristine and annealed composites was tested in the reduction of 4-nitroaniline and was shown to remain practically unchanged for five consecutive test cycles. Composites annealed at 140 °C were also tested for their capacity to absorb arsenic(III) ions in cross-flow mode. It was observed that the sorption capacity of composite membranes increased by 48.7% compared to the pristine sample and reached its maximum after 10 h of annealing, then gradually decreased by 24% with further annealing.

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Section: Assessment Of Catalytic Activitysupporting

confidence: 61%

Cu/CuO Composite Track-Etched Membranes for Catalytic Decomposition of Nitrophenols and Removal of As(III)

et al. 2020

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“…CoB has been widely investigated as a catalyst, and shows much more activity and selectivity than the Raney nickel and Raney cobalt for the hydrogenation of citral [14], but there are few reports of CoB as a hydrogen storage alloy. In our previous work, a Co 2 B alloy was successfully synthesized by arc melting [15] and was used as a new type of negative electrode.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical hydrogen storage performance of AB5-CoB composites synthesized by a simple mixing method

Song

Wang

et al. 2009

Rare Metals

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AB 5 (MlNi 4.0 Al 0.3 Cu 0.5 Zn 0.2 ) alloy and CoB alloy were prepared by arc melting. AB 5 -CoB composites were synthesized by simple mixing of AB 5 alloy powders and CoB alloy powders, and their electrochemical hydrogen storage properties were studied as negative electrodes in KOH aqueous solution. The maximum discharge capacity of the AB 5 -CoB(50%) composite (the content of CoB in the composite is 50 wt.%) reached 365.3 mAh⋅g −1 . After 100 charge-discharge cycles, the discharge capacity of the AB 5 -CoB(50%) composite was still much higher than that of the AB 5 alloy. The high rate discharge capability (HRD) and potentiodynamic polarization were also tested.

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“…3 shows the XRD pattern of the catalysts of Co-Ni-Mo-B with different contents of cobalt. The sample Co-150(C) represented Co-150 heated at 548 K under nitrogen atmosphere for 6 h. Fresh Co-Ni-Mo-B catalysts showed a broad diffraction peak around 2h = 45°, indicating a typical amorphous structure [31][32][33][34][35][36][37][38][39]. Another broad diffraction peak around 2h = 28°was ascribed to boron oxides [38,40].…”

Section: Resultsmentioning

confidence: 99%

“…Although the sulfided catalyst has a good deoxygenation activity for the HDO of phenols, it is rather difficult to further hydrogenate the aromatic compounds. Therefore, developing a new HDO catalyst with high hydrogenation The amorphous metallic alloy catalysts have focused much attention owing to their unique isotropic and high concentration of coordinative unsaturated sites [24] which resulted in their excellent activity and selectivity in catalytic reactions [25][26][27][28][29][30][31][32][33][34][35][36][37]. We have studied the HDO of phenol on amorphous catalysts in our earlier work [38].…”

Section: Introductionmentioning

confidence: 99%

Characterization and hydrodeoxygenation properties of Co promoted Ni–Mo–B amorphous catalysts: influence of Co content

Wang

Yang

Luo

et al. 2010

Reac Kinet Mech Cat

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Different contents of promoter (Co) in Co-Ni-Mo-B amorphous catalysts were prepared by chemical reduction of the precursors of metal salts with a sodium borohydride aqueous solution. The catalysts were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Adding a proper content of the promoter Co into Ni-Mo-B amorphous catalyst could increase the MoO 2 content and decrease the particle size, but doping excess Co would cover some of the active sites and increase the particle size of the catalysts. The effect of Co content on the catalytic hydrodeoxygenation activity of the amorphous catalysts was studied using phenol as a model compound. The main route for the HDO of phenol on these amorphous catalysts was hydrogenation-dehydration and the content of aromatic compounds in HDO products was decreased obviously. The pseudo first-order reaction rate constant of the phenol HDO on Co-Ni-Mo-B amorphous catalyst was much greater than that of MoS 2 when adding proper promoter Co.

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Effect of crystallinity on the catalytic performance of amorphous Co–B particles prepared from cobalt nitrate and potassium borohydride in the cinnamaldehyde hydrogenation

Cited by 38 publications

References 8 publications

Cu/CuO Composite Track-Etched Membranes for Catalytic Decomposition of Nitrophenols and Removal of As(III)

Cu/CuO Composite Track-Etched Membranes for Catalytic Decomposition of Nitrophenols and Removal of As(III)

Electrochemical hydrogen storage performance of AB5-CoB composites synthesized by a simple mixing method

Characterization and hydrodeoxygenation properties of Co promoted Ni–Mo–B amorphous catalysts: influence of Co content

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