Modulating the Acidic Properties of Mesoporous Mo_x–Ni_0.8Cu_0.2O Nanowires for Enhanced Catalytic Performance toward the Methanolysis of Ammonia Borane for Hydrogen Production

Abstract

Rational construction of inexpensive, highly efficient, and stable catalysts for ammonia borane (AB) methanolysis is in high demand but still remains a great challenge. In this work, we have successfully fabricated uniform Mo x −Ni 0.8 Cu 0.2 O nanowires using a simple hydrothermal method followed by a post-calcination treatment and flexibly modulated the acidity of their surface by changing the amount of Mo introduced into Ni 0.8 Cu 0.2 O. The Mo 0.1 −Ni 0.8 Cu 0.2 O catalyst displayed strong catalytic activity toward AB methanolysis with an ultrahigh turnover frequency of 46.9 mol H 2 mol cat.−1 min −1 , which is even higher than some noble metal catalysts. In this work, an equation regarding the relationship between the quantity of moderated acid sites of catalysts and its corresponding activity toward AB methanolysis was first determined. A plausible mechanism for AB methanolysis catalyzed by Mo x − Ni 0.8 Cu 0.2 O was proposed, and the benefits of the introduction of MoO 3 to Ni 0.8 Cu 0.2 O for enhancing the catalytic performance were also discussed. These findings can form a basis for the rational construction of inexpensive catalysts with robust performance toward AB methanolysis for hydrogen production.

Highly effective palladium nanocatalyst supported in polymeric networks for the catalytic hydrogen generation from borane‐morpholine complex

“…According to XRD patterns given in Figure 9(b), no remarkable change was observed in the crystalline phase of the Pd 0 nanoparticles in the structure of the catalyst. This made us think that the main factors causing the slowdown of the catalytic cycle are the viscosity of the reaction medium and the accumulation of boron‐containing by‐products on the catalyst surface [44] …”

“…This made us think that the main factors causing the slowdown of the catalytic cycle are the viscosity of the reaction medium and the accumulation of boron-containing by-products on the catalyst surface. [44]…”

In situ encapsulating cobalt phosphide into a quasi-MOF: a high-performance catalyst for hydrolytic dehydrogenation of ammonia borane

“…Among them, ammonia borane (AB) has attracted considerable attention, especially for portable and ondemand systems, owing to its advantages of having a high energy density (19.6 wt%), a low molecular weight (30.87 g mol À1 ), its non-toxicity and good stability. [9][10][11] Fortunately, AB is easily soluble in water, and the catalytic hydrolysis of AB is an efficient and mild way of hydrogen generation. In principle, AB hydrolysis is able to release three equivalents of hydrogen in the presence of a suitable catalyst (NH 3 BH 3 + 2H 2 O -NH 4 BO 2 + 3H 2 ).…”

Theoretical Study of Hydrogen Production from Ammonia Borane Catalyzed by Metal and Non-Metal Diatom-Doped Cobalt Phosphide

“…Therefore, there is an upsurge in research to look for non-noble metal catalysts with high catalytic activity and service life [ 16 , 17 , 18 , 19 ]. At present, quantities of composite materials with high catalytic activity and high stability which can catalyze the evolution of hydrogen from ammonia borane have been synthesized [ 20 , 21 , 22 , 23 , 24 ].…”