The synergistic effect of the carbon shell pore volume and core Pd size of Pd@hollow@C-X for the synthesis of H2O2

Yolk–shell Pd@hollow@C-X (X = 1.5, 3.2, 4.5 and 6) catalysts with Pd as the core and porous carbon as the shell were prepared via the inverse microemulsion method. The carbon shell pore volume and core Pd size were controlled by varying the NH3·H2O amount. Results showed that with an increase in the...

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Published inNew journal of chemistry Vol. 45; no. 3; pp. 1617 - 1625
Main Authors Zhang, Jiesong, Liu, Peng, Shi, Yongyong, Fu, Chengbing, Lin, Qian, Liu, Fei, Pan, Hongyan
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 21.01.2021
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Summary:Yolk–shell Pd@hollow@C-X (X = 1.5, 3.2, 4.5 and 6) catalysts with Pd as the core and porous carbon as the shell were prepared via the inverse microemulsion method. The carbon shell pore volume and core Pd size were controlled by varying the NH3·H2O amount. Results showed that with an increase in the NH3·H2O amount, the average particle size of Pd nanoparticles and shell pore volume decreased first and then increased, and when the NH3·H2O amount was 3.2 ml, the as-prepared Pd@hollow@C-3.2 catalyst had the smallest Pd particle size and largest shell pore volume as 5.54 ± 1.37 nm and 0.12 m3 g−1, respectively. The smaller Pd particle size can provide more active sites for the adsorption and reaction of H2 and O2 reactants, and the larger shell pore volume is beneficial for their adsorption. This makes the Pd@hollow@C-3.2 catalyst possess the highest selectivity and productivity in the H2O2 synthesis, reaching 93% and 3197 mmol (gPd−1 h−1)−1, respectively, at 1 bar.
ISSN:1144-0546
1369-9261
DOI:10.1039/d0nj04035e