One-step dip-coating of uniform γ-Al 2 O 3 layers on cordierite honeycombs and its environmental applications

Yuan, Jing; Zhao, Kun; Cai, Tonghui; Gao, Zhenyuan; Yang, Ling; He, Dannong

doi:10.1016/j.ceramint.2016.06.003

Cited by 18 publications

(15 citation statements)

References 25 publications

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“…High dispersion of active species often leads to good performances of the catalyst. As mentioned above, Pd-Cu well dispersed on cordierite coated with γ-Al 2 O 3 was very active and stable in CO oxidation with a more than 92% CO conversion at 30 • C during a 192 h test [23]. Pd/Gr/Cor with an improved dispersion exhibited a higher activity for toluene combustion compared with Pd/Cor.…”

Section: Active Phase Depositionmentioning

confidence: 70%

“…Lu et al [22] prepared 8%-12% of γ-Al 2 O 3 as a secondary layer on cordierite honeycomb in this way with 3-4 cycles. Yuan et al [23] developed a facile method for dip coating, which achieved 30% γ-Al 2 O 3 loading by one step, and the weight loss was less than 1% after 3 h ultrasonic treatment. They pointed out that the "nail-like" interaction between the coating layer and the carrier played a key role (Figure 1).…”

Section: Secondary Layer Formationmentioning

confidence: 99%

“…and pseudoboehmite (green circles) with a comparable diameter were suspended in liquid; (b) pseudo-boehmite was partially dissolved when the pH was adjusted to 3~4; (c) wet slurry on the surface, a proportion of the slurry penetrated into the macropores of the support by capillary forces; (d) the nail-like interaction between the coating and support resulted in a strong adhesion after drying and calcinating. Reproduced with permission from [23]; copyright (2016), Elsevier. Pd/Al 2 O 3 monolithic catalysts are active for methane combustion at low temperature and high oxygen/fuel ratios.…”

Section: Secondary Layer Formationmentioning

confidence: 99%

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Fabrication of Monolithic Catalysts: Comparison of the Traditional and the Novel Green Methods

et al. 2019

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Monolithic catalysts have great industrial application prospects compared to powdered catalysts due to their low pressure drop, the high efficiency of mass and heat transfer, and recyclability. Deposition of active phases on the monolithic carriers dramatically increases the utilization rate and has been attracting continuous attention. In this paper, we reviewed the traditional (impregnation, coating, and spraying) and novel (hydrothermal and electrodeposition) strategies of surface deposition integration, analyzed the advantages and disadvantages of both ways, and then prospected the possible directions for future development of integration technologies.

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Section: Active Phase Depositionmentioning

confidence: 70%

Section: Secondary Layer Formationmentioning

confidence: 99%

Section: Secondary Layer Formationmentioning

confidence: 99%

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Fabrication of Monolithic Catalysts: Comparison of the Traditional and the Novel Green Methods

et al. 2019

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“…The substrate is dipped and withdrawn from the solution at a ixed speed. Therefore, the coating's thickness is in good control without producing waste [38,39].…”

Section: Sol-gel Dip-coating Methodsmentioning

confidence: 99%

Hydroxyapatite-Based Coating on Biomedical Implant

Harun¹,

Asri²,

Sulong³

et al. 2018

Hydroxyapatite - Advances in Composite Nanomaterials, Biomedical Applications and Its Technological Facets

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The use of metallic biomaterials for replacement of biomedical implants has been traced back from the nineteenth century. These metallic biomaterials have been declared as clinical success as their mechanical properties that satisfy the prerequisite of the human bone. Nevertheless, critical issues of the materials when they are utilised as implants; including the releasing toxic and harmful metal ions through wear and corrosion processes after longer implantation. Besides that, the bonding strength between bone and implants itself is considered weak due to the diferent components of human bone and metal implants. Hence, developing hydroxyapatite (HAp) coating on metallic biomaterials is expected to overcome the problems faced by biocompatible metallic biomaterials. As far as this, various commercial techniques have been introduced to develop the HAp coating on metallic biomaterials. The techniques are including plasma-spraying method, sol-gel dip-coating, electrochemical deposition and high-velocity suspension plasma-spraying. The formation of HAp coating on metallic biomaterials improved the corrosion resistance together promoting its load-bearing ability and enhanced substrate-coating adhesion.

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“…These monoliths contain parallel channels of an inert oxide such as cordierite (2MgO 2 .Al 2 O 3 .5SiO 2 ) and are coated with a thin layer of the catalyst (Özyönüm et al, 2016; Şem et al, 2016). Cordierite has numerous important applications due to its low cost, its excellent properties, such as low coefficient of thermal expansion, good thermal resistance, low dielectric constant, high chemical inertness, refractoriness and adequate mechanical properties (Labhsetwar et al, 2012;Yuan et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

REMOVAL OF NITRATE FROM DRINKING WATER BY USING PdCu STRUCTURED CATALYSTS BASED ON CORDIERITE MONOLITHS

Jaworski

Barbero

Siri

et al. 2019

Braz. J. Chem. Eng.

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Structured catalysts were prepared, characterized and evaluated in NO 3 removal from drinking water. Different suspensions containing a previously optimized PdCu/5wt% ZrO 2-Al 2 O 3 powder catalyst (hereinafter PdCu/5ZA p) were prepared and deposited on cordierite monoliths by washcoating. The effect of suspension concentration, the particle size, the immersion number, the use of suspension stabilizer agent, and an alumina precoating on the coating adherence and catalytic performance were studied. All the prepared structured catalysts were active for the elimination of NO 3 and presented good selectivity to N 2 (> 93%) in synthetic water samples. The catalyst performance was related to the amount of deposited catalyst. The highest activity and the best coating adherence were obtained with the structured catalyst prepared by a single immersion in a 14 wt% concentration suspension, which was obtained from the powder catalyst milled for 10 h and stabilized with colloidal alumina. This catalyst also showed good activity when it was reused for four cycles and when it was evaluated with real water samples.

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One-step dip-coating of uniform γ-Al 2 O 3 layers on cordierite honeycombs and its environmental applications

Cited by 18 publications

References 25 publications

Fabrication of Monolithic Catalysts: Comparison of the Traditional and the Novel Green Methods

Fabrication of Monolithic Catalysts: Comparison of the Traditional and the Novel Green Methods

Hydroxyapatite-Based Coating on Biomedical Implant

REMOVAL OF NITRATE FROM DRINKING WATER BY USING PdCu STRUCTURED CATALYSTS BASED ON CORDIERITE MONOLITHS

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