Catalytic ceramic papers for diesel soot oxidation: A spray method for enhanced performance

Tuler, Fernando Esteban; Gaigneaux, Éric M.; Miró, Eduardo Ernesto; Milt, Viviana Guadalupe; Debecker, Damien P.

doi:10.1016/j.catcom.2015.09.013

Cited by 17 publications

(17 citation statements)

References 31 publications

(33 reference statements)

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“…A successful example of catalyst preparation by spray drying is that of NaAlO 2 microspheres which consisted in the aggregation of relatively small crystallites, exhibiting enhanced surface basicity and outstanding activity in the base‐catalysed synthesis of glycerol carbonate . Spray drying can also be used to disperse active materials onto structured catalyst supports, as demonstrated recently in the case of soot combustion catalysts . Interestingly, aerosol processing can be used to trigger chemical transformations during the drying of the droplets and generate new materials of high interest for heterogeneous catalysis.…”

Section: Aerosol‐assisted Sol‐gel Processmentioning

confidence: 99%

Innovative Sol‐Gel Routes for the Bottom‐Up Preparation of Heterogeneous Catalysts

Debecker

2017

The Chemical Record

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Heterogeneous catalysts can be prepared by different methods offering various levels of control on the final properties of the solid. In this account, we exemplify bottom-up preparation routes that are based on the sol-gel chemistry and allow to tailor some decisive properties of solid catalysts. First, an emulsion templating strategy is shown to lead to macrocellular self-standing monoliths with a macroscopic 3D structure. The latter can be used as catalyst or catalyst supports in flow chemistry, without requiring any subsequent shaping step. Second, the aerosol-assisted sol-gel process allows for the one-step and continuous production of porous mixed oxides. Tailored textural properties can be obtained together with an excellent control on composition and homogeneity. Third, the application of non-hydrolytic sol-gel routes, in the absence of water, leads to mixed oxides with outstanding textural properties and with peculiar surface chemistry. In all cases, the resulting catalytic performance can be correlated with the specificities of the preparation routes presented. This is exemplified in catalytic reactions in the fields of biomass conversion, petro chemistry, enantioselective organic synthesis, and air pollution mitigation.

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Section: Aerosol‐assisted Sol‐gel Processmentioning

confidence: 99%

Innovative Sol‐Gel Routes for the Bottom‐Up Preparation of Heterogeneous Catalysts

Debecker

2017

The Chemical Record

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“…However, the application of ceramic fibers as filler material, can enable the transfer of material properties inherent to ceramic papers onto paper‐derived to a limited extend. In several applications recently mentioned in the literature, paper‐derived ceramics are worth to be considered as potential alternatives to ceramic papers: Silica fiber papers or alumina fiber papers, stabilized with CeO 2 ‐nanoparticles as soot particle filter systems for diesel engines Refractory‐grade aluminosilicate fiber papers filled with zeolites as catalyzer supports with functionalized surfaces for carrying catalytically active zeolitic phases …”

Section: Applications Of Highly Filled Papers and Paper‐derived Matermentioning

confidence: 99%

Highly Filled Papers, on their Manufacturing, Processing, and Applications

et al. 2019

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Since more than a decade ago, the research on highly filled papers, as well as paper-derived inorganic materials, has greatly intensified. As presented in this review, highly filled papers as preforms allow for the design of porous or dense, multilayered, and geometrically complex structures. These paperderived ceramic-or metal-based materials are generated by the heattreatment of highly filled papers. Paper-derived materials are potential materials of choice for applications in transportation, energy-generation, environmental conservation, support structures, medical uses, and electronic components. Due to the adjustability of the filler content and the good machinability of highly filled papers, paper-derived sheets or multilayers may include intricate structures and tailored gradients in phase structure or porosity. Paper-derived multilayers also may contain cast ceramic tapes or other functionalized layers, as presented in some examples. Computer-aided manufacturing processes for paper-derived materials can be supplemented by prediction models for the sintering shrinkage in order to identify optimal post-processing steps, stacking orders and orientations for highly filled paper layers within multilayer green bodies. The accuracy of established component-level sintering models can be significantly increased by microstructure models of the highly filled paper. ParameterName Unit α Mismatch parameter for fiber cross-sections, Equation (5) Dimensionless α p Layer position in viscoelastic paper structure model, Equation (2) Dimensionless A 0 Initial amplitude of perturbation, Equations (15) 10 À6 m A(f) Parameter for evolution of instantaneous carbon conversion rate, Equation (7) Dimensionless A diff Source controlled diffusion parameter, Equations (9) 10 À7 N A match Modeling parameter, Equations (8) Dimensionless a Inter-particle contact-area radius, Equations (19) 10 À8 m a Local average pore area, Equation (4) 10 À6 m 2 b Pore geometry constant, Equation (20) Dimensionless ß evo , m evo Empirical constants for grain evolution in SOVS model, Equation (8) Dimensionless ß r(c)p Proportionality constant for bimodal packing fraction determination, Equation (18) Dimensionless C Modeling constant for debindering pressure calculation, Equation (7) 10 À6 (m 2 Á s)/K C 1 , C 2 , C 3 , C 4 , C 5 Parameters in the Riedel model that are determined by the dihedral angle, Equations (9) Dimensionless c glue Heat capacity of the adhesive layers, Equation (3) 10 À6 s c L , c s Volume fraction of larger-sized/smaller-sized particles in a multimodal mixture of particles, Equation (17)and (18) 10 0 vol% c vol Volume concentration of pulp fibers, Equation (4) 10 0 vol% γ, γ 0 Strain relaxation rate of calendered paper with initial value, Equation (2) Dimensionless γ B Grain boundary energy density, Equation (13) 10 0 J m À2 γ b Specific energy for grain boundary diffusion, Equation (9) 10 3 J mol À1 γ S Material surface energy, Equation (8, 11, and 13) 10 0 J m À2 Δ Half of the inter-particle boundary thickness, Equation (19) 10 À8...

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“…Catalytic ingredients were also added to decrease the temperature of soot combustion during filter regeneration: Co, K, Ba and Ce were used in line with previous works in which we studied active formulations for the reaction mentioned [14,15]. The filters were prepared by alternatively plugging the end of the monolith channels, thus forcing the gases to pass through the porous walls of the channels.…”

Section: Accepted Manuscriptmentioning

confidence: 99%