On-demand Hydrogen Production from Organosilanes at Ambient Temperature Using Heterogeneous Gold Catalysts

Abstract

An environmentally friendly (“green”), H2-generation system was developed that involved hydrolytic oxidation of inexpensive organosilanes as hydrogen storage materials with newly developed heterogeneous gold nanoparticle catalysts. The gold catalyst functioned well at ambient temperature under aerobic conditions, providing efficient production of pure H2. The newly developed size-selective gold nanoparticle catalysts could be separated easily from the reaction mixture containing organosilanes, allowing an on/off-switchable H2-production by the introduction and removal of the catalyst. This is the first report of an on/off-switchable H2-production system employing hydrolytic oxidation of inexpensive organosilanes without requiring additional energy.

Programming Hydrogen Production via Controllable Emulsification/Demulsification in a Switchable Oil–Water System

“…Microscope photos were obtained by a Nikon ECLIPSE E600W POL instrument. The generated hydrogen volumes in all runs were determined using the water displacement method. ,, Qualitative analyses of generated hydrogen were conducted in an Agilent 7890B-5977A gas chromatograph using Ar as the carrier gas, a thermal conductivity detector (GC-TCD) at injection, oven, and detection temperatures of 120, 60, and 100 °C.…”

“…Although alternative, more miscible, organic liquids, such as alcohols, have been shown to be effective, , such liquids are typically fuels themselves. Given the great interest in techniques for the controllable generation of hydrogen under mild conditions, − there is a need for new technologies.…”

Design of High-Performance Heterogeneous Catalysts using Apatite Compounds for Liquid-Phase Organic Syntheses

“…The synthesis of size-controlled Au NPs on HAP can be performed using glutathione as a capping reagent. The strong adsorption capacity of HAP enables the immobilization of Au NPs on the HAP surface with high dispersity, and the removal of glutathione coordinated to Au NPs by calcination gives AuHAP-NC . AuHAP-NC (0.5 wt %), AuHAP-NC (2 wt %), and AuHAP-NC (3 wt %) feature Au NPs with average diameters of 1.9, 2.3, and 3.1 nm, respectively.…”

“…The strong adsorption capacity of HAP enables the immobilization of Au NPs on the HAP surface with high dispersity, and the removal of glutathione coordinated to Au NPs by calcination gives AuHAP-NC. 36 AuHAP-NC (0.5 wt %), AuHAP-NC (2 wt %), and AuHAP-NC (3 wt %) feature Au NPs with average diameters of 1.9, 2.3, and 3.1 nm, respectively. The highest TON and TOF values (up to 3333000 and 77 s −1 , respectively) in the hydrolytic oxidation of dimethylphenylsilane at ambient temperature are observed for AuHAP-NC (0.5 wt %) with a mean particle diameter of 1.9 nm (eq 23).…”

Pd, Rh and Ru nanohybrid-catalyzed tetramethyldisiloxane hydrolysis for H2 generation, nitrophenol reduction and Suzuki–Miyaura cross-coupling

“…They are conveniently charged and transported using existing chemical liquid fuel tanks. [40][41][42] Third, the only by-products, silanols derived from siloxane hydrolysis, are widely used in cross-coupling reactions and silicon-based polymeric building materials. [43][44][45][46][47] Fourth, some siloxanes, e.g.…”