1. Effect of Shell Pore Microstructure of the Pd Hollow Catalysts Pd@HMAN for H2O2 Generation
- Author
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Hongyan Pan, Qian Lin, Jiesong Zhang, Shen Xiao, Guo Dan, and Shi Lianjun
- Subjects
010405 organic chemistry ,Chemistry ,Shell (structure) ,Nanoparticle ,General Chemistry ,010402 general chemistry ,01 natural sciences ,Catalysis ,0104 chemical sciences ,Tetraethyl orthosilicate ,chemistry.chemical_compound ,Adsorption ,Volume (thermodynamics) ,Chemical engineering ,Aluminosilicate ,Mass transfer - Abstract
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 cm3g−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 H2, O2 and H2O2, and the larger the shell pore volume of Pd@HMAN-M was, the larger the adsorption amount of reactant H2 was, and thus the higher selective and productive of H2O2 could be obtained. The catalyst Pd@HMAN-1.5 had the highest H2O2 selectivity (81%) and productivity (795 mmol gPd−1 h−1) at atmospheric pressure due to its most substantial shell pore volume of (0.18 cm3g−1) and H2 adsorption amount.
- Published
- 2020