Hierarchical porous materials: catalytic applications

Parlett, Christopher M. A.; Wilson, Karen; Lee, Adam F.

doi:10.1039/c2cs35378d

Cited by 866 publications

(582 citation statements)

References 185 publications

(172 reference statements)

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“…As colloids start to assemble, they form porous structures that can have a degree of order from single crystalline to amorphous. Using the colloids as a template and inverting the structure allows one to form macropores (defined as those with pore diameter ≥ ~30 nm 79 ) with interesting fluid and gas transport properties. 80 Reproduced with permission from the American Chemical Society.…”

Section: Control Over Structural Features In Colloidal Assembliesmentioning

confidence: 99%

“…CBPM can be made with high surface area, interconnected porosity, and control over material composition, all of which are important for developing catalysts having high activity and selectivity, thermal stability, and superior mass transport (Figure 23). 58,79 CBPM possess many advantageous characteristics and degrees of freedom that enable them to be designed for a wide range of catalytic applications (Figure 23). They exhibit architectural tunability easily achievable via hierarchical templating and characterized by a porous network where many factors can be controlled, including wall thickness, pore size, pore interconnectivity, and shape.…”

Section: Catalytic Applicationsmentioning

confidence: 99%

“…surfactants) offers minimal diffusive limitations to mass transport by macropores (pore diameter ≥ ~30 nm), and high surface area for active site dispersion over micro and/or mesopores (pore diameter ≤ 1.5 nm and 1.5-30 nm, respectively). 79 Additionally, templated structures are used almost exclusively in order to increase the macroporosity and decrease the amount of material used. CBPM assembly methods allow good control over the composition and incorporation of functional materials (e.g.…”

Section: Catalytic Applicationsmentioning

confidence: 99%

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A colloidoscope of colloid-based porous materials and their uses

et al. 2016

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Nature evolved a variety of hierarchical structures that produce sophisticated functions. Inspired by these natural materials, colloidal self-assembly provides a convenient way to produce structures from simple building blocks with a variety of complex functions beyond those found in nature. In particular, colloid-based porous materials (CBPM) can be made from a wide variety of materials. The internal structure of CBPM also has several key attributes, namely porosity on a sub-micrometer length scale, interconnectivity of these pores, and a controllable degree of order. The combination of structure and composition allow CBPM to attain properties important for modern applications such as photonic inks, colorimetric sensors, self-cleaning surfaces, water purification systems, or batteries. This review summarizes recent developments in the field of CBPM, including principles for their design, fabrication, and applications, with a particular focus on structural features and materials' properties that enable these applications. We begin with a short introduction to the wide variety of patterns that can be generated by colloidal self-assembly and templating processes. We then discuss different applications of such structures, focusing on optics, wetting, sensing, catalysis, and electrodes. Different fields of applications require different properties, yet the modularity of the assembly process of CBPM provides a high degree of tunability and tailorability in composition and structure. We examine the significance of properties such as structure, composition, and degree of order on the materials' functions and use, as well as trends in and future directions for the development of CBPM.

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Section: Control Over Structural Features In Colloidal Assembliesmentioning

confidence: 99%

Section: Catalytic Applicationsmentioning

confidence: 99%

Section: Catalytic Applicationsmentioning

confidence: 99%

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A colloidoscope of colloid-based porous materials and their uses

et al. 2016

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“…This exciting concept 108 can now be potentially extended to other systems to facilitate one-pot cascade reactions with high activities and selectivities. These initial studies and many others [103][104][105][106][107][108] that underpin the potential application of hierarchical molecular sieves in catalysis, have been promising and have highlighted the ability of the hierarchical systems to circumvent the mass-transfer problems that have plagued catalytically promising microporous molecular sieves. Recent advances 3,67,71,75,97 in creating well-defined, multifunctional single-sites at the atomic level on microporous architectures need to be suitably integrated and adapted for the design and synthesis of hybrid hierarchical systems.…”

Section: Computational Design Of Active Sitesmentioning

confidence: 99%

Predictive design of engineered multifunctional solid catalysts

2014

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The ability to devise and design multifunctional active sites at the nanoscale, by drawing on the intricate ability of enzymes to evolve single-sites with distinctive catalytic function, has prompted complimentary and concordant developments in the field of catalyst design and in situ operando spectroscopy. Innovations in design-application approach have led to a more fundamental understanding of the nature of the active site and its mechanistic influence at a molecular level, that have enabled robust structure-property correlations to be established, which has facilitated the dextrous manipulation and predictive design of redox and solid -acid sites for industrially-significant, sustainable catalytic transformations.

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“…A variação da composição química das paredes dos poros, combinadaà relação entre aárea superficial e o volume do espaço poroso, definem para cada uma dessas amostras diferentes propriedades de catálise [29,30].…”

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Processo para produção e caracterização de rochas sintéticas com porosidade controlada para aplicações em Petrofísica por RMN de alto e baixo campo.

Chencarek

Correia

Nascimento

et al. 2018

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Resumo: Neste trabalho apresentamos uma metodologia para a produção de amostras de rochas sintéticas, a partir da sinterização de microesferas de vidro tipo soda-cal, para a realização de um estudo sistemático dos tempos de relaxação em RMN de alto e baixo campo, e aplicações em Petrofísica. Através do controle do intervalo de tamanhos das microesferas, e da calibração do protocolo de tratamento térmico, quatro tipos de amostras de rocha sintética, de mesma mineralogia, foram produzidos com diferentes valores de permeabilidade, em dois padrões de tamanhos utilizados na indústria. Imagens de microscopia eletrônica de varredura e microtomografia computadorizada foram utilizadas para caracterização do nível de sinterização dos grãos e da distribuição do espaço poroso em cada uma das amostras. A caracterização química das amostras foi realizada através da técnica de EDS, para o controle mineralógico. Experimentos de relaxação longitudinal (T 1 ) em RMN de alto campo, e relaxação transversal (T 2 ) em RMN de alto e baixo campo, realizados nas amostras saturadas, mostram correlações entre os valores dos tempos de relaxação (T 1 e T 2 ) e o intervalo de tamanhos do espaço poroso das amostras. Os dados obtidos nas medidas de relaxação de RMN foram ajustados segundo os modelos de relaxação correntes na petrofísica de meios porosos.Palavras chave: RMN, rochas sintéticas, Petrofísica, meios porosos.Abstract: In this paper we present a method for production of synthetic rock samples, by sintering of soda-cal glass microspheres, to perform a systematic study of NMR relaxation times in high and low field, and Petrophysics application. By controlling the size range of the microspheres, and calibration of the thermal treatment protocol, four types of synthetic rock samples, with the same mineralogy, were produced with different values of permeability, in two standard sizes used in industry. Scanning electron microscopy and micro computed tomography images were used to characterize the grain sintering level and the porous space distribution on each sample. The chemical characterization of the samples was performed by EDS technique for mineralogy control. Longitudinal relaxation experiments (T 1 ) in high field NMR, and transverse relaxation (T 2 )

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Hierarchical porous materials: catalytic applications

Abstract: In this review, we discuss the phenomenon of complementary macropore incorporation into mesoporous and/or microporous solids in order to enhance their catalytic performance in fuels and chemicals synthesis.

Cited by 866 publications

References 185 publications

A colloidoscope of colloid-based porous materials and their uses

A colloidoscope of colloid-based porous materials and their uses

Predictive design of engineered multifunctional solid catalysts

Processo para produção e caracterização de rochas sintéticas com porosidade controlada para aplicações em Petrofísica por RMN de alto e baixo campo.

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