Anchoring Pd-nanoparticles on dithiocarbamate- functionalized SBA-15 for hydrogen generation from formic acid

Abstract

Hydrogen (H2) generation from natural biological metabolic products has remained a huge challenge for the energy arena. However, designing a catalytic system with complementary properties including high surface area, high loading, and easy separation offers a promising route for efficient utilization of nanoreactors for prospective H2 suppliers to a fuel cell. Herein, selective dehydrogenation of formic acid (FA) as a natural biological metabolic product to H2 and CO2 gas mixtures has been studied by supporting ultrafine palladium nanoparticles on organosulfur-functionalized SBA-15 nanoreactor under ultrasonic irradiation. The effects of the porous structure as a nanoreactor, and organosulfur groups, which presented around the Pd due to their prominent roles in anchoring and stabilizing of Pd NPs, studied as a superior catalyst for selective dehydrogenation of FA. Whole catalytic systems were utilized in ultrasonic irradiation in the absence of additives to provide excellent TOF/TON values. It was found that propose catalyst is a greener, recyclable, and more suitable option for the large-scale application and provide some new insights into stabilization of ultra-fine metal nanoparticle for a variety of applications.

Carbon-Doping as Efficient Strategy for Improving Photocatalytic Activity of Polysilicon Supported Pd in Hydrogen Evolution from Formic Acid

“…Furthermore, the FT-IR spectrum of the recovered catalyst revealed no significant changes in the main peaks (see ESI). Finally, the TOF of the FA degradation catalyzed by Pd@C-PS was compared with those from previous reports that used amine-functionalized SBA-15 [33,34], dithiocarbamatefunctionalized SBA-15 [35], mesoporous silica supported Pd-MnO x [36], and silica nanospheres as the catalyst for FA degradation [37]. While some of these catalysts showed better performances than Pd@C-PS without photo-irradiation, our catalyst showed satisfying activity under photocatalytic conditions (see ESI).…”

“…The bandgap energies of PS, C-PS, Pd@PS, and Pd@C-PS are 5.45, 5.05, 5.65, and 5.24 eV, respectively. As a matter of fact, a new photocatalyst of Pd supported on silicon material, Pd@C-PS, was synthesized, in which the catalyst is optically active as an additional advantage to the previous similar catalysts mentioned above [33][34][35][36][37]. Therefore, Pd@C-PS might promote Pd-catalyzed reactions photocatalytically in milder reaction conditions with higher efficiency compared to previous reports due to the use of photons' energies by the semiconductor support.…”

“…This active catalyst showed high conversion for the FA degradation reaction especially when used as an alloy with Ag [23], Au [24], Cu [25], Co [26], Ni [27], Pt [28], Cr [29], Sn [30], Zn [31], and Ru [32]. Moreover, Pd supported on Si-based supports has been employed as the catalyst for this reaction, such as aminefunctionalized SBA-15 [33,34], dithiocarbamate-functionalized SBA-15 [35], mesoporous silica supported Pd−MnO x [36], and silica nanosphere [37].…”

Single-pot tandem oxidative/C–H modification amidation process using ultrasmall PdNP-encapsulated porous organosilica nanotubes

“…Synthesis of SBA-15 using an aqueous solution of the Pluronic copolymer P123 (E21P67E21), 2 M HCl and tetraethyl orthosilicate (TEOS) was executed step-by-step according to our previous method. 42–54 Loading of Pd NPs in SBA-15 pore channels was performed according to the abovementioned method.…”

Synthesis, Characterization, and Antibacterial Activity of Co(II), Ni(II), and Pd(II) Complexes with Bisdithiocarbamate and Cyclic Amines Ligands

“…The compounds were evaluated for their in vitro antibacterial activity against the test bacteria by disc diffusion method. [21] The bacterial species were obtained from Biological Department, College of Science, Tikrit University. Nutrient agar was used for bacterial screening, DMSO was used as solvent and ciprofloxine, ampicillin, and amoxllin (1 × 10 −3 g mL −1 ) as control.…”