Direct demonstration of enhanced diffusion in mesoporous ZSM-5 zeolite obtained via controlled desilication.
DelftChemTech, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands.Journal of the American Chemical Society (impact factor: 9.91). 02/2007; 129(2):355-60. DOI:10.1021/ja065737o pp.355-60
ABSTRACT A 2 orders of magnitude gas transport improvement in a medium pore ZSM-5 zeolite has been achieved upon introduction of intracrystalline mesoporosity in gradient-free crystals by desilication post-treatment in alkaline medium.
Article: Challenges and Strategies in the Synthesis of Mesoporous Alumina Powders and Hierarchical Alumina Monoliths[show abstract] [hide abstract]
ABSTRACT: A new rapid, very simple and one-step sol-gel strategy for the large-scale preparation of highly porous γ-Al 2 O 3 is presented. The resulting mesoporous alumina materials feature high surface areas (400 m 2 g −1), large pore volumes (0.8 mL g −1) and the γ-Al 2 O 3 phase is obtained at low temperature (500 °C). The main advantages and drawbacks of different preparations of mesoporous alumina materials exhibiting high specific surface areas and large pore volumes such as surfactant-nanostructured alumina, sol-gel methods and hierarchically macro-/mesoporous alumina monoliths have been analyzed and compared. The most reproducible synthesis of mesoporous alumina are given. Evaporation-Induced Self-Assembly (EISA) is the sole method to lead to nanostructured mesoporous alumina by direct templating, but it is a difficult method to scale-up. Alumina featuring macro-and mesoporosity in monolithic shape is a very promising material for in flow applications; an optimized synthesis is described.
Article: An overview of recent development in composite catalysts from porous materials for various reactions and processes.[show abstract] [hide abstract]
ABSTRACT: Catalysts are important to the chemical industry and environmental remediation due to their effective conversion of one chemical into another. Among them, composite catalysts have attracted continuous attention during the past decades. Nowadays, composite catalysts are being used more and more to meet the practical catalytic performance requirements in the chemical industry of high activity, high selectivity and good stability. In this paper, we reviewed our recent work on development of composite catalysts, mainly focusing on the composite catalysts obtained from porous materials such as zeolites, mesoporous materials, carbon nanotubes (CNT), etc. Six types of porous composite catalysts are discussed, including amorphous oxide modified zeolite composite catalysts, zeolite composites prepared by co-crystallization or overgrowth, hierarchical porous catalysts, host-guest porous composites, inorganic and organic mesoporous composite catalysts, and polymer/CNT composite catalysts.International Journal of Molecular Sciences 01/2010; 11(5):2152-87. · 2.60 Impact Factor
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