Porous Materials for Hydrolytic Dehydrogenation of Ammonia Borane

Abstract

Hydrogen storage is still one of the most significant issues hindering the development of a “hydrogen energy economy”. Ammonia borane is notable for its high hydrogen densities. For the material, one of the main challenges is to release efficiently the maximum amount of the stored hydrogen. Hydrolysis reaction is a promising process by which hydrogen can be easily generated from this compound. High purity hydrogen from this compound can be evolved in the presence of solid acid or metal based catalyst. The reaction performance depends on the morphology and/or structure of these materials. In this review, we survey the research on nanostructured materials, especially porous materials for hydrogen generation from hydrolysis of ammonia borane.

A High‐Throughput Composite Catalyst based on Nickel Carbon Cubes for the Hydrogenation of 5‐Hydroxymethylfurfural to 2,5‐Dimethylfuran

“…This is especially helpful for the synthesis of catalysts such as metal species immobilized on a porous support as it allows for the unification of very different properties in one composite . For example, compared with the corresponding bulk metal, the composite possesses better accessible sites and increased diffusion of the reactants through the pores, hence leading to improved catalytic performance . Furthermore, the composite synthesis enables the homogeneous dispersion and stabilization of the supported metal compound (e.g., metal, metal carbide, metal oxide) while ensuring a large active surface area …”

“…Among the various types of support materials, carbons with a hierarchical pore structure have attracted much attention in heterogeneous catalysis . This is owing to their widely tunable properties, structuring possibilities, and availability .…”

“…[4] For example, compared with the corresponding bulk metal, the composite possesses better accessible sites and increased diffusion of the reactants through the pores, hence leading to improved catalytic performance. [5][6][7][8] Furthermore, the composite synthesis enables the homogeneousd ispersion and stabilization of the supported metal compound (e.g.,m etal, metal carbide, metal oxide) whileensuring al arge active surfacea rea. [9][10][11] Among the varioust ypes of support materials, carbonsw ith ah ierarchical pore structure have attracted much attention in heterogeneous catalysis.…”

“…[9][10][11] Among the varioust ypes of support materials, carbonsw ith ah ierarchical pore structure have attracted much attention in heterogeneous catalysis. [6,[12][13][14] This is owing to their widely tunable properties,s tructuring possibilities, and availability. [5,[15][16][17] With regard to catalytic applications,t hree-dimensional (3D) hierarchical pore structures with interconnected micro-, meso-,a nd macropores are crucial to overcome transport limitations and to ensure good heata nd mass transfer throughout the pore system.…”

Microemulsion-Based One-Step Electrochemical Fabrication of Mesoporous Catalysts

“…Over the last three decades, mesoporous materials have been fabricated utilizing a wide variety of fabrication approaches that are based on templated synthesis by using various synthesis techniques such as sol-gel, hydrothermal, solvothermal, direct oxidation, chemical vapor deposition, physical vapor deposition, electrodeposition, sonochemical, microwave, and so on [12,13]. The intensive research conducted in terms of synthesizing and developing more efficient mesoporous materials has allowed the exploration of a wide range of chemical natures and stoichiometries (e.g., silica, aluminosilicates, carbon, metals, metals oxides, metal sulfides, metal carbides, metal nitrides, polymers, zeolites), different shapes and architectures (e.g., films, nanomaterials, composites) and structure dimensions and pore geometries (e.g., cylindrical, spherical, cage-type structures) [12][13][14][15]. However, to date, no comprehensive classification of mesoporous materials has been done on the basis of nature, shape, architecture, or fabrication approach.…”