Recent Advances and Perspectives on Supported Catalysts for Heterogeneous Hydrogen Production from Ammonia Borane

Abstract

Ammonia borane (AB), a liquid hydrogen storage material, has attracted increasing attention for hydrogen utilization because of its high hydrogen content. However, the slow kinetics of AB hydrolysis and the indefinite catalytic mechanism remain significant problems for its large-scale practical application. Thus, the development of efficient AB hydrolysis catalysts and the determination of their catalytic mechanisms are significant and urgent. A summary of the preparation process and structural characteristics of various supported catalysts is presented in this paper, including graphite, metal-organic frameworks (MOFs), metal oxides, carbon nitride (CN), molybdenum carbide (MoC), carbon nanotubes (CNTs), boron nitride (h-BN), zeolites, carbon dots (CDs), and metal carbide and nitride (MXene). In addition, the relationship between the electronic structure and catalytic performance is discussed to ascertain the actual active sites in the catalytic process. The mechanism of AB hydrolysis catalysis is systematically discussed, and possible catalytic paths are summarized to provide theoretical considerations for the designing of efficient AB hydrolysis catalysts. Furthermore, three methods for stimulating AB from dehydrogenation by-products and the design of possible hydrogen product-regeneration systems are summarized. Finally, the remaining challenges and future research directions for the effective development of AB catalysts are discussed.

A 3D-printed CuNi alloy catalyst with a triply periodic minimal surface for the reverse water-gas shift reaction

“…The intrinsic catalytic performance of CuNi alloys has been extensively demonstrated to surpass that of their respective pure metals in various reactions. 27–30 Also, the RWGS reaction as a model reaction can directly convert CO 2 into CO to further synthesise various value-added chemicals. 31–34 Combined with computational fluid dynamics (CFD) for gas flow behaviours, we demonstrated that the monolithic catalyst with a TPMS architecture exhibits significantly improved mass and heat transfer compared with the monolithic catalyst with a honeycomb structures.…”

Highly dispersed Pd-based pseudo-single atoms in zeolites for hydrogen generation and pollutant disposal

“…Hydrogen (H 2 ) is considered a green and efficient energy carrier, but efficient and controllable hydrogen storage remains a bottleneck for the future hydrogen economy. 37–40 Formic acid (FA, HCOOH) has emerged as a promising liquid-phase hydrogen storage material for portable H 2 storage applications. 41–44 In addition, FA can also be used as a green and cost-effective reductant for the reduction of toxic pollutants, such as hexavalent chromium (Cr( vi )), which possesses serious mutagenicity and carcinogenicity.…”

Homogenous nickel-catalyzed chemoselective transfer hydrogenation of functionalized nitroarenes with ammonia–borane

“…8 Over the last five years, the ammonia–borane (NH 3 BH 3 , AB) complex has attracted significant attention in applications of hydrogen storage and chemical conversion. 9 AB is a potentially efficient, relatively cheap, easy-to-use/handle reagent and the hydrogenation is carried out employing standard glassware for transfer hydrogenation reactions. Furthermore, the major benefits of AB are it being air-stable under ambient conditions, of high hydrogen content (19.6 wt%, 152.8 gH 2 per L in theory), soluble in water and other polar solvents, less toxic, and widely accessible.…”

“…Furthermore, the major benefits of AB are it being air-stable under ambient conditions, of high hydrogen content (19.6 wt%, 152.8 gH 2 per L in theory), soluble in water and other polar solvents, less toxic, and widely accessible. 9 Furthermore, hydrogen generation from AB has been investigated a lot by numerous researchers and hydrogen gas can be released straightforwardly by thermolysis or hydrolysis processes. 9 For these reasons, the utilization of AB as a hydrogen source in a variety of transfer hydrogenation reactions either in the presence of catalysts or catalyst-free systems has become successful.…”

“…9 Furthermore, hydrogen generation from AB has been investigated a lot by numerous researchers and hydrogen gas can be released straightforwardly by thermolysis or hydrolysis processes. 9 For these reasons, the utilization of AB as a hydrogen source in a variety of transfer hydrogenation reactions either in the presence of catalysts or catalyst-free systems has become successful. 9 More recently, AB has been applied as a hydrogen source for the reduction of nitroaromatic compounds by applying different catalytic systems, 10,11 but only focused on simple substituted functional groups and the applicability of the catalysts for multifunctional nitroarenes ( e.g.…”