Open AccessHydrogenation of Toluene to Methyl Cyclohexane over PtRh Bimetallic Nanoparticle-Encaged Hollow Mesoporous Silica Catalytic Nanoreactors
Author(s) -
Kaijie Li,
Heliang An,
Peijian Yan,
Caoping Yang,
Tao Xiao,
Junyou Wang,
Shenghu Zhou
Publication year - 2021
Publication title -
acs omega
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.0c06268
Subject(s) - nanoreactor , cyclohexane , materials science , bimetallic strip , mesoporous material , catalysis , nanoparticle , chemical engineering , toluene , mesoporous silica , nanotechnology , chemistry , organic chemistry , engineering
PtRh bimetallic nanoparticle (NP)-encaged hollow mesoporous silica nanoreactors (PtRh@HMSNs) are prepared by employing metal-ion-containing charge-driven polymer micelles as templates. These nanoreactors feature ∼1-2 nm PtRh NPs in ∼11 nm hollow cavities of HMSNs. Among various Pt x Rh y @HMSNs, Pt 0.77 Rh 1 @HMSNs show the best catalytic performance for toluene hydrogenation. Under 30 °C, atmospheric H 2 pressure, and a toluene/(Pt+Rh) molar ratio of 200/1, Pt 0.77 Rh 1 @HMSNs reach 100.0% of methyl cyclohexane yield and demonstrate a much better catalytic performance than monometallic Pt@HMSNs and Rh@HMSNs and their physical mixtures. Moreover, Pt 0.77 Rh 1 @HMSNs exhibit a good catalytic stability during recycling experiments. The enhanced performance of Pt 0.77 Rh 1 @HMSNs is ascribed to the interaction between Pt and Rh, the beneficial effect of the relatively large mesoporous channels for mass transfer, as well as the confinement effect of functional NPs inside hollow cavities.