Effect of Shell Pore Microstructure of the Pd Hollow Catalysts Pd@HMAN for H.sub.2O.sub.2 Generation

• Published in: Catalysis letters Vol. 151; no. 5; pp. 1320 - 1329
• Main Authors: Guo, Dan, Zhang, Jiesong, Xiao, Shen, Shi, Lianjun, Lin, Qian, Pan, Hongyan
• Format: Journal Article
• Language: English
• Published: Springer 01.05.2021
• Subjects: Palladium; Palladium catalysts
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1007/s10562-020-03384-9

Pd-based hollow catalysts, Pd@HMAN, in which Pd was used as core and hollow aluminosilicate (HMAN) as shell, have been successfully synthesized by self-assembling method. Pd@HMAN-M (M = 1, 1.5, 2, 2.5) with uniform Pd nanoparticle size (~ 9.3 nm) and different shell volume (0.06-0.18 cm.sup.3g.sup.-1) were prepared by varying the addition amount of tetraethyl orthosilicate (TEOS). It is found that the shell pore size of 1-3.5 nm of the catalysts Pd@HMAN-M was conducive to the mass transfer of H.sub.2, O.sub.2 and H.sub.2O.sub.2, and the larger the shell pore volume of Pd@HMAN-M was, the larger the adsorption amount of reactant H.sub.2 was, and thus the higher selective and productive of H.sub.2O.sub.2 could be obtained. The catalyst Pd@HMAN-1.5 had the highest H.sub.2O.sub.2 selectivity (81%) and productivity (795 mmol g.sub.Pd.sup.-1 h.sup.-1) at atmospheric pressure due to its most substantial shell pore volume of (0.18 cm.sup.3g.sup.-1) and H.sub.2 adsorption amount.