The Effect of Prewetting on the Loading of γ‐Alumina Washcoated Cordierite Monolith

Mogalicherla, Aswani K.; Kunzru, Deepak

doi:10.1111/j.1744-7402.2009.02441.x

Cited by 7 publications

(5 citation statements)

References 20 publications

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“…As shown in Figure b, the solid content is one of the most important factors on the slurry viscosity. This result agrees well with the observations in the literature. − …”

Section: Resultssupporting

confidence: 93%

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Catalytic Cracking of Supercritical n-Dodecane over Wall-Coated HZSM-5 Zeolites with Micro- and Nanocrystal Sizes

et al. 2012

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Wall-coated HZSM-5 with micro- and nanoscale crystal sizes were prepared and coated to the inner surface of SS304 stainless-steel tubes using washcoating methods. It was found that nanoscale HZSM-5 zeolite slurry has different rheological properties, washcoat loadings, and adhesions with microscale HZSM-5. Catalytic activities of the prepared micro- and nanoscale HZSM-5 zeolite coatings were studied using catalytic cracking of supercritical-phase n-dodecane (550 °C and 4 MPa), indicating that catalytic cracking activity and stability were remarkably improved more than 1 time by nanoscale HZSM-5 coatings compared to microscale HZSM-5 coatings. Acid and pore structure characterization showed that the better performance of nanoscale HZSM-5 coating may be attributed to the shorter diffusion length of the micropore, the higher diffusion rate of supercritical n-dodecane in the intracrystal mesopore, and the special acid nature of nanoscale HZSM-5 coatings.

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“…As shown in Figure b, the solid content is one of the most important factors on the slurry viscosity. This result agrees well with the observations in the literature. − …”

Section: Resultssupporting

confidence: 93%

“…The solid loading of slurries, as an index of coating reproducibility and controllability, strongly depends upon the slurry viscosity, , number of immersions, etc. The variation of the loading percentage with different zeolite contents is shown in Figure a.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Cracking of Supercritical n-Dodecane over Wall-Coated HZSM-5 Zeolites with Micro- and Nanocrystal Sizes

et al. 2012

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“…Both of them increased with solid content increasing. Studies have shown the same results as the viscosity is strongly dependent on solid content. Another feature worth noting was that at higher concentration, the viscosity of ZM‐AT2 was much higher than that of ZM‐P.…”

Section: Resultsmentioning

confidence: 57%

Preparation and Performances of Hierarchical Structured HZSM‐5 Washcoating on Stainless‐Steel Substrates

et al. 2016

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The washcoats of the hierarchical HZSM‐5 zeolite (through desilication) were prepared on the inner surface of SS304 stainless‐steel tubes. The properties of slurries and coatings were characterized by analysis of particle size, measurements of rheological property, loading, adhesion, and finally the catalytic cracking test. It was found that introducing mesoporosity on the zeolite crystals was beneficial for reducing the particle size during ball milling for slurries preparation, which was helpful for improving loading due to a significant change in the rheological property. As the interaction between the particles with different sizes was enhanced after ball milling, the adhesion of the prepared coatings was improved. The catalytic activity and stability of the hierarchical HZSM‐5 coatings for the catalytic cracking of n‐dodecane were 56% and 75% higher than that of the conventional one, respectively. This probably resulted from the enhanced diffusion rate of reactant and products in the crystals and the coatings.

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“…Also, upon repeated coating, the slurry will become more viscous than the initial concentration, until a point is reached where each coat adds excessive weight on the monolith, coherently affecting homogeneity. Capillary forces allow for water to be drawn into the pores of the monolith structure which creates competition for adherence of the slurry [108]. An intermediate pre-wetting step, discussed by Mogalicherla and Kunzru, allows for a high washcoat loading to be achieved [108].…”

Section: Slurry Coatingmentioning

confidence: 99%

“…Capillary forces allow for water to be drawn into the pores of the monolith structure which creates competition for adherence of the slurry [108]. An intermediate pre-wetting step, discussed by Mogalicherla and Kunzru, allows for a high washcoat loading to be achieved [108]. Agrafiotis and Tsetsekou have reported an optimum slurry concentration of 45 wt % solids and viscosity between 50 and 150 mPa·s [94].…”

Section: Slurry Coatingmentioning

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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The Effect of Prewetting on the Loading of γ‐Alumina Washcoated Cordierite Monolith

Cited by 7 publications

References 20 publications

Catalytic Cracking of Supercritical n-Dodecane over Wall-Coated HZSM-5 Zeolites with Micro- and Nanocrystal Sizes

Catalytic Cracking of Supercritical n-Dodecane over Wall-Coated HZSM-5 Zeolites with Micro- and Nanocrystal Sizes

Preparation and Performances of Hierarchical Structured HZSM‐5 Washcoating on Stainless‐Steel Substrates

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

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