Facile, template-free synthesis of macroporous SiO2 as catalyst support towards highly enhanced catalytic performance for soot combustion

XK-Ce0.5Zr0.5O2 catalysts were prepared by incipient-wetness impregnation method, and the catalytic activities for the soot combustion were studied using TPO. XRD, BET, FT-IR and YCPS were used to investigate the influences of KNO3 concentration on the catalytic activities for soot combustion. It was found that the KNO3 had great effect on the surface area and the chemical environment. Compare with Ce0.5Zr0.5O2, the catalytic activities of xK-Ce0.5Zr0.5O2 for soot combustion were improved significantly; the catalyst with x =0.5 had the best catalytic performance, on which T-i and T-p were 290 degrees C and 360 degrees C, respectively. The results suggested that the formation of K2CO3 and molten KNO3 phase during the reaction course promoted the catalytic activities obviously.

Catalytic combustion

Incipient wetness impregnation

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Citations (3)

Catalytic oxidation of diesel soot: Catalyst development

Studies in surface science and catalysis (1995)

John P.A. Neeft O.P. van Pruissen Michiel Makkee Jacob A. Moulijn

Catalytic Oxidation

10.1016/s0167-2991(06)81457-6

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Citations (22)

Soot Particle Nucleation and Agglomeration

Springer eBooks (1983)

Gilles Prado J. Lahaye Brian S. Haynes

Particle (ecology)

Volume fraction

Characterization

Number density

10.1007/978-1-4684-4463-6_8

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Citations (9)

Enhancement of the Generation and Transfer of Active Oxygen in Ni/CeO₂ Catalysts for Soot Combustion by Controlling the Ni–Ceria Contact and the Three-Dimensional Structure

Environmental Science & Technology (2020)

Begoña Sellers-Antón Esther Bailón‐García Andrea Cárdenas‐Arenas Arantxa Davó‐Quiñonero Dolores Lozano‐Castelló

The effect of the three-dimensionally ordered macroporous (3DOM) structure and the Ni doping of CeO2 on the physicochemical properties and catalytic activity for soot combustion was studied. Moreover, the way in which Ni is introduced to the ceria support was also investigated. For this, CeO2 supports were synthesized with uncontrolled (Ref) and 3DOM-structured morphology, and their respective Ni/CeO2 catalysts were prepared by impregnation of the previously synthesized supports or by successive impregnation of both precursors (Ni and Ce) on the 3DOM template. Conclusions reached in this study are: (1) the 3DOM structure increases the surface area of the catalysts and improves the catalyst-soot contact. (2) The doping of CeO2 with Ni improves the catalytic activity because the NiO participates in the catalytic oxidation of NO to NO2, and also favors the production of active oxygen and the catalyst oxygen storage capacity. (3) Ni incorporation method affects its physicochemical and catalytic properties. By introducing Ni by successive infiltration in the solid template, the CeO2 crystal size is reduced, Ni dispersion is improved, and the catalyst reducibility is increased. All of these characteristics make the catalyst synthesized by successive infiltration to have higher catalytic activity for soot combustion than the Ni-impregnated CeO2 catalyst.

Non-blocking I/O

Catalytic combustion

10.1021/acs.est.9b07682

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Citations (45)

Porosity reduction model in titanium–hydroxyapatite FGM composites using shrinkage measurement

Materials Research Innovations (2011)

R. G. Rahbari Noor Hayaty Abu Kasim Ahmed A. Madfa M. Hamdi M. Bayat

AbstractA multilayered titanium (Ti)–hydroxyapatite (HA) functionally graded material was produced via pressureless sintering at 1100°C. The initial and final porosities were determined via shrinkage measurements. The final porosity verification was carried out by the Archimedes method. The experimental porosity measurements were compared with two proposed models. The macroscopic and microstructure features and the measured porosities confirmed that the volume fraction porosity was associated with both matrix and reinforcing particles in all cases. The percolation threshold was observed at x = 0·75 in the xTi+(1−x)HA mixture.Keywords: Percolation thresholdPorosity reduction modelShrinkage measurement

Shrinkage

Volume fraction

Percolation (cognitive psychology)

Matrix (chemical analysis)

10.1179/143307511x13031890748281

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Citations (2)

Synergistic effects of inter- and intra-particle porosity of TiO2 nanoparticles on photovoltaic performance of dye-sensitized solar cells

Microporous and Mesoporous Materials (2018)

Ji‐Young Ahn Xiuting Luo Soo Hyung Kim

Particle (ecology)

10.1016/j.micromeso.2018.03.003

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Citations (9)

STUDIES ON SILICASUPPORTED POLYOLEFIN CATALYSTS EFFECTS OF CHEMICALACTIVATION ON MORPHOLOGY OF CATALYSTS

Huaxue fanying gongcheng yu gongyi (1999)

Rong Shunxi

By SEM method, particle fracture phenomena were found in the catalyst preparation process. Fractures would be aggravated with the increase in the amount of AlEt3 used in chemicalactivation steps. At the same time, the agglomeration phenomenon of small particle and fragments was also found on large catalyst particle surfaces, and the diameters of the small particles or fragments were mostly below 20 m. Both fracture and agglomeration made the catalyst macromorphology worse. Certain kind of cottonlike substance occurred on the local surface of the catalyst with excessive amount of AlEt3.

Polyolefin

Particle (ecology)

Morphology

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Citations (0)

Preparation of Thin Porous Silica Foam on Alumina Disk Substrate

Catalysis Letters (2005)

Ping-le Liu Leon Lefferts

Polystyrene

Colloidal Silica

Filtration (mathematics)

10.1007/s10562-005-9189-0

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Citations (0)