An efficient method for enhancing adhesion and uniformity of Al2O3 coatings on nickel micro-foam used in micropacked beds

Ma, Chi; Sang, Le; Duan, Xiaonan; Yin, Jianjun; Zhang, Jisong

doi:10.1016/j.cjche.2021.05.022

Cited by 6 publications

(8 citation statements)

References 37 publications

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“…The coatings were fabricated on the Ni foams with SC and ED methods. Based on our previous work to fabricate a single support material on the Ni foam, , a common ED approach was developed to fabricate a variety of coatings in this work. The average particle sizes of Al 2 O 3 , SiO 2 , CeO 2 , and TiO 2 powders by the nano particle size analyses were 233.5, 426.8, 417.5, and 281.1 nm, respectively, as shown in Figure S1.…”

Section: Resultsmentioning

confidence: 99%

“…Al 2 O 3 powders were coated on the substrate through a suspension circulation (SC) with 162 mL·min –1 , by which the suspension can access the pores of Ni foam. The processes of substrate pretreatment and Al 2 O 3 suspension circulation referred to our previous work . Al 2 O 3 particles with a diameter of about 460 μm were employed.…”

Section: Methodsmentioning

confidence: 99%

“…The processes of substrate pretreatment and Al 2 O 3 suspension circulation referred to our previous work. 38 A nano particle size and zeta potential analyzer, a scanning electron microscope (SEM), an energy dispersive spectrometer (EDS), and a dynamic nitrogen adsorption apparatus were employed for the property analyses of the powders, coatings, and catalysts. For the dynamic nitrogen adsorption apparatus, AMS in the solvent of methylcyclohexane with a concentration (C AMS ) of 10 wt % was fed by a pump, and H 2 was generated with a gas flow rate (G) of 20 mL•min −1 by a mass flow controller.…”

Section: Fabrication and Analysis Of The Catalystsmentioning

confidence: 99%

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Preparation of Highly Effective Ni Foam Monolithic Catalysts by Electrolytic Deposition for Nitrobenzene Hydrogenation in a Micropacked Bed

Liu

Duan

et al. 2022

Ind. Eng. Chem. Res.

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An electrolytic deposition (ED) method is proposed to fabricate monolithic catalysts and applied for nitrobenzene (NB) hydrogenation in a micropacked bed (MPB). In contrast to the particle catalysts and monolithic catalysts with a suspension circulation (SC) method, the monolithic catalysts with the ED method have better uniformity for coatings and the active component. The investigation of overall external mass transfer performance reveals that the hydrogenation in MPBs with monolithic catalysts is significantly affected by external mass transfer. The catalysts with the ED method demonstrate high activity, selectivity, and stability in NB hydrogenation, and the activity is higher than that of particle catalysts and catalysts with the SC method. This ED method is universal and applicable for a variety of coatings, including Al2O3, SiO2, CeO2, and TiO2, and can provide more efficient monolithic catalysts for improving the hydrogenation performance in MPBs.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Fabrication and Analysis Of The Catalystsmentioning

confidence: 99%

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Preparation of Highly Effective Ni Foam Monolithic Catalysts by Electrolytic Deposition for Nitrobenzene Hydrogenation in a Micropacked Bed

Liu

Duan

et al. 2022

Ind. Eng. Chem. Res.

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“…For comparison, the conventional impregnation (IM) and slurry circulation (SC) methods were also used to load the SiO 2 coating. 22 The destructive stresses were tested to evaluate the adhesion strength of the SiO 2 coating synthesized by these three methods. The existence of chemical interactions in the ED method was verified by a series of characterization methods.…”

Section: ■ Introductionmentioning

confidence: 99%

Highly Efficient Monolithic Catalyst with Excellent Adhesion of SiO₂ Coating for Catalytic Hydrogenation in the Rotating Packed Bed Reactor

Han

Gao

Wang

et al. 2022

Ind. Eng. Chem. Res.

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Monolithic catalysts have great potential to be used in rotating packed bed (RPB) reactors due to the advantages of easy installation and structural stability. However, the complex operation environment of liquid scouring and centrifugal force in the RPB reactor leads to the loss of active material from the substrate. In this work, SiO2 coating was deposited on a nickel foam by the electrodeposition (ED) method to improve the adhesion strength of SiO2 coating. The adhesion properties were tested from three aspects of mechanical stress, thermal stress, and chemical stress. Compared with the traditional impregnation method and slurry circulation method, the ED method can reduce the mass loss rate from higher than 45% to less than 4%. Moreover, the formation of chemical interactions (Si–O–Ni bond), as characterized by Raman and XPS spectroscopy, illustrated the enhanced adhesion strength by the ED method. The ED method also improved the catalytic performance and reusability of the monolithic catalyst installed in the RPB reactor. This work demonstrates that chemical interactions can be used to enhance the coating adhesion strength and provides a new way to develop stable monolithic catalysts.

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“…Various surface pretreatments can be employed to modify the physicochemical characteristics of the naturally formed layer so that the bonds between the deposited coating and the substrate to be stronger and to obtain a better adhesion [18][19][20][21]. Acid treatments can increase the roughness and therefore the surface area [22], while alkaline treatments can lead to the formation of hydrated oxide layers, improving coating adhesion [23].…”

Section: Introductionmentioning

confidence: 99%

SELECTING A SURFACE PREPARATION TREATMENT ON A MEDIUM ENTROPY Ti-Zr-Ta-Ag ALLOY

Nartita¹,

Ioniță²,

Demetrescu³

et al. 2021

AnnalsARSciPhysChem

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All metallic alloys undergo some surface pretreatment before coating deposition. This preparation step influences the surface roughness and can also change the surface chemical composition, therefore influencing the coating adhesion and the physicochemical characteristics of the coated alloy. Choosing an appropriate surface pretreatment can maximize the coated alloys performances. In this work, we aimed to comparatively analyze the surface of the Ti-Zr-Ta-Ag alloy before and after two different surface pretreatments. The surface composition and morphology were investigated using atomic force microscopy, scanning electron microscopy, and energy dispersive spectroscopy, while surface energy and mechanical properties were investigated using contact angle measurement and Vickers hardness test.

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An efficient method for enhancing adhesion and uniformity of Al2O3 coatings on nickel micro-foam used in micropacked beds

Cited by 6 publications

References 37 publications

Preparation of Highly Effective Ni Foam Monolithic Catalysts by Electrolytic Deposition for Nitrobenzene Hydrogenation in a Micropacked Bed

Preparation of Highly Effective Ni Foam Monolithic Catalysts by Electrolytic Deposition for Nitrobenzene Hydrogenation in a Micropacked Bed

Highly Efficient Monolithic Catalyst with Excellent Adhesion of SiO₂ Coating for Catalytic Hydrogenation in the Rotating Packed Bed Reactor

SELECTING A SURFACE PREPARATION TREATMENT ON A MEDIUM ENTROPY Ti-Zr-Ta-Ag ALLOY

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An efficient method for enhancing adhesion and uniformity of Al2O3 coatings on nickel micro-foam used in micropacked beds

Cited by 6 publications

References 37 publications

Preparation of Highly Effective Ni Foam Monolithic Catalysts by Electrolytic Deposition for Nitrobenzene Hydrogenation in a Micropacked Bed

Preparation of Highly Effective Ni Foam Monolithic Catalysts by Electrolytic Deposition for Nitrobenzene Hydrogenation in a Micropacked Bed

Highly Efficient Monolithic Catalyst with Excellent Adhesion of SiO2 Coating for Catalytic Hydrogenation in the Rotating Packed Bed Reactor

SELECTING A SURFACE PREPARATION TREATMENT ON A MEDIUM ENTROPY Ti-Zr-Ta-Ag ALLOY

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Highly Efficient Monolithic Catalyst with Excellent Adhesion of SiO₂ Coating for Catalytic Hydrogenation in the Rotating Packed Bed Reactor