Self-formation of hierarchical micro-meso-macroporous structures: Generation of the new concept “Hierarchical Catalysis”

Vantomme, Aurélien; Léonard, A.; Yuan, Zhong‐Yong; Su, Bao‐Lian

doi:10.1016/j.colsurfa.2007.01.010

Cited by 97 publications

(82 citation statements)

References 20 publications

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“…According to the above characterization results and recent reports [19,20,30,37], a postulated formation mechanism is proposed to account for the formation of hierarchically multi-modal sponge-like macro/mesoporous titania. When water drops were added to the surface of the TBOT coating without stirring, the contact between water and TBOT immediately produces a thin, dense semi-permeable titania membrane at the water-TBOT interface due to hydrolysis reactions occurring very quickly.…”

Section: Resultsmentioning

confidence: 88%

Preparation and photocatalytic activity of multi-modally macro/mesoporous titania

Wang

Cheng

et al. 2009

Res Chem Intermed

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Hierarchically disorder sponge-like macro/mesoporous titania was prepared by adding distilled water dropwise to a coating of tetrabutyl titanate. The results reveal that the un-calcined samples show obvious photocatalytic activity and multi-modal pore-size distribution. With increasing calcination temperatures, the photocatalytic activity and crystallinity increase. At 400°C, the calcined sample shows the highest photocatalytic activity. Further increasing the calcination temperatures results in the decrease of photocatalytic activity due to the drastic decrease of specific surface areas. However, the 600°C-calcined sample exhibits the highest specific photocatalytic activity due to high anatase crystallinity.

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Section: Resultsmentioning

confidence: 88%

Preparation and photocatalytic activity of multi-modally macro/mesoporous titania

Wang

Cheng

et al. 2009

Res Chem Intermed

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“…4), the macro-porous monolithic support and catalysts take on a multi-level porous structure, that is, the monoliths are enriched with interconnected macropores with meso and micro pores spreading over the walls of the macropores. In the words of Su et al [27], the so prepared monolithic 3.4 TEM Figure 6 gives TEM pictures of the different catalysts. In P-Pt/c-Al 2 O 3 (Fig.…”

Section: Photographs and Sem Imagesmentioning

confidence: 99%

Macroporous Monolithic Pt/γ-Al2O3 and K–Pt/γ-Al2O3 Catalysts Used for Preferential Oxidation of CO

et al. 2008

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Macro-porous monolithic c-Al 2 O 3 was prepared by using macro-porous polystyrene monolith foam as the template and alumina sol as the precursor. Platinum and potassium were loaded on the support by impregnation method. TG, XRD, N 2 adsorption-desorption, SEM, TEM, and TPR techniques were used for catalysts characterization, and the catalytic performance of macro-porous monolithic Pt/c-Al 2 O 3 and K-Pt/c-Al 2 O 3 catalysts were tested in hydrogen-rich stream for CO preferential oxidation (CO-PROX). SEM images show that the macropores in the macro-porous monolithic c-Al 2 O 3 are interconnected with the pore size in the range of 10 to 50 lm, and the monoliths possess hierarchical macro-meso(micro)-porous structure. The macro-porous monolithic catalysts, although they are less active intrinsically than the particle ones, exhibit higher CO conversion and higher O 2 to CO oxidation selectivity than particle catalysts at high reaction temperatures, which is proposed to be owing to its hierarchical macro-meso(micro) -porous structure. Adding potassium lead to marked improvement of the catalytic performance, owing to intrinsic activity and platinum dispersion increase resulted from K-doping. CO in hydrogen-rich gases can be removed to 10 ppm over monolithic K-Pt/c-Al 2 O 3 by CO-PROX.

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“…Other one is related to post-synthesis treatments [29]. Lately, a self-formation phenomenon of porous hierarchy has been discovered [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48]. This new strategy is based on the very fast polymerisation of metal alkoxides in aqueous solution, yielding hierarchical meso-macroporous oxide and metallosilicate materials.…”

Section: Introductionmentioning

confidence: 99%

Hierarchically structured meso-macroporous aluminosilicates with high tetrahedral aluminium content in acid catalysed esterification of fatty acids

Lemaire

Wang

Wei

et al. 2011

Journal of Colloid and Interface Science

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Self-formation of hierarchical micro-meso-macroporous structures: Generation of the new concept “Hierarchical Catalysis”

Cited by 97 publications

References 20 publications

Preparation and photocatalytic activity of multi-modally macro/mesoporous titania

Preparation and photocatalytic activity of multi-modally macro/mesoporous titania

Macroporous Monolithic Pt/γ-Al2O3 and K–Pt/γ-Al2O3 Catalysts Used for Preferential Oxidation of CO

Hierarchically structured meso-macroporous aluminosilicates with high tetrahedral aluminium content in acid catalysed esterification of fatty acids

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