An amine-functionalized mesoporous silica-supported PdIr catalyst: boosting room-temperature hydrogen generation from formic acid

Abstract

PdIr/SBA-15-NH2 nanocomposites were synthesized via a facile surface functionalization and co-reduction method and used as a superior catalyst for complete and fast dehydrogenation of formic acid at room temperature.

Robust Hydrogen Production from Additive-Free Formic Acid via Mesoporous Silica-Confined Pd-ZrO2 Nanoparticles at Room Temperature

“…Palladium (Pd) is an essential component of many catalysts used in various chemical reactions such as hydrogenation, carbonylation, coupling reaction, and so on. Recently, Pd has been widely confirmed to be the active metal and critical species for the dehydrogenation of FA. ,, Generally, active metals which cooperate with a catalytic accelerator and are stabilized by a versatile substrate, might exhibit unexpected catalytic performance. − The hexagonal mesoporous silica (SBA-15), first prepared by Zhao and co-workers, with an abundant ordered channel structure and large specific surface area would be an idea substrate to stabilize active nanoparticles (NPs) and improve the mass transfer efficiency during the catalytic reaction. , The amine groups (−NH 2 ), which not only provide the Brønsted basic sites for the deprotonation of FA molecules but also offer strong interaction sites for active metallic NPs, can be easily modified on the surface of SBA-15 via the chemical treatment with the surface silanols (Si-OH). − In addition, zirconium dioxide (ZrO 2 ), a kind of metal oxide with abundant surface basic sites, can be considered as a potential promoter for the dehydrogenation of FA …”

The enhanced role of surface amination on the catalytic performance of polyacrylonitrile supported palladium nanoparticles in hydrogen generation from formic acid

“…Recent research progresses demonstrated that the catalytic properties of the Pd‐base catalysts depend largely on the surface properties of supports, which can influence the dispersion states, stability, and the electronic properties of Pd NPs through building interaction between Pd NPs and supports 6–12 . For instance, Hattori et al used titanium dioxide as the catalyst support, and found that the electron transfer between titanium dioxide and Pd may change the electronic density of the active metals, and then promote the catalytic activity for the hydrogen production by FA 7 .…”

“…For instance, Hattori et al used titanium dioxide as the catalyst support, and found that the electron transfer between titanium dioxide and Pd may change the electronic density of the active metals, and then promote the catalytic activity for the hydrogen production by FA 7 . In addition, it was reported that the catalytic properties of the supported Pd‐base catalyst may be considerably enhanced after introducing some basic groups (like amino groups) into the solid supports 8 . For example, by using the amino functionalized silica as support, Lee et al synthesize a highly active supported Pd catalyst for dehydrogenation of FA without additives, and found that the catalytic performance of the Pd‐based catalysts rose with the level of amination 9 .…”

Improved hydrogen evolution performance by engineering bimetallic AuPd loaded on amino and nitrogen functionalized mesoporous hollow carbon spheres

“…65-2867), indicating that the Au 0.3 Pd 0.7 nanoparticles in Au 0.3 Pd 0.7 /NH 2 –N-HMCS are formed in alloy structure, which is well consistent with the HRTEM result. 24 Compared with the XRD patterns of Au 0.3 Pd 0.7 /N-HMCS and Au 0.3 Pd 0.7 /HMCS (Fig. S4 † ), the peak of Au 0.3 Pd 0.7 /NH 2 –N-HMCS centered around 39° is significantly broader, which further confirms the ultrafine size of Au 0.3 Pd 0.7 nanoparticles in Au 0.3 Pd 0.7 /NH 2 –N-HMCS.…”