Related Experiment Video
Updated: May 10, 2025
Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
Histidine-Based "Transfer Stations" at Carbon-Immobilized Metal Particles Enable Rapid Hydrogen Transfer for
Zhenyi Yang1, Guoyu Hou1, Nana Gao2
1School of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, P.R. China.
None:
The interaction of surface metal species with the solution plays a key role in engineering heterogeneous catalytic processes. Herein, we present the facile synthesis of L-histidine-coordinated PdAg nanoparticles (4.03 ± 0.08 nm) anchored on pristine carbon supports (denoted as PdAg-NH2/C) and their use for formic acid dehydrogenation (FAD). Significant acceleration of FAD related to the histidine is observed, and the enhancement mechanism is experimentally and theoretically investigated. The presence of L-histidine at metal sites promotes rapid binding of formic acid molecules due to acid-base interactions. The local enrichment of both protons and formate at the metal-solution interfaces promotes the subsequent formate decomposition and hydride transfer to the metal surface. The as-generated surface H species are more concentrated compared to the previously reported catalyst where the metal is loaded on an amino modified support, this enabling a significantly enhanced H2 production. The optimal Pd1Ag1-NH2/C catalyst exhibits a high turnover frequency (TOF) of 6493.5 h-1 at 333 K based on the total amount of Pd, together with an H2 selectivity of 100%. This study emphasizes the critical role of optimizing local transport pathways near catalytic centers chemically and further provides insights into the rational development of heterogeneous catalysts for FAD technologies.
More Related Videos
11:28Biomass Conversion to Produce Hydrocarbon Liquid Fuel Via Hot-vapor Filtered Fast Pyrolysis and Catalytic Hydrotreating
Published on: December 25, 2016
10:57Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
Related Concept Videos
02:13Reduction of Alkenes: Catalytic Hydrogenation
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
01:01Acid Halides to Carboxylic Acids: Hydrolysis
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields...
01:13Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
02:23Alcohols from Carbonyl Compounds: Reduction
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat...