10.1021/cs501124d.s001
Tian Yi Ma
Tian Yi
Ma
Shi Zhang Qiao
Shi Zhang
Qiao
Acid–Base Bifunctional Periodic Mesoporous
Metal Phosphonates for Synergistically and Heterogeneously Catalyzing
CO<sub>2</sub> Conversion
American Chemical Society
2014
surface area
activity loss
mass transport
Mesoporous Metal Phosphonates
mesoporous titanium phosphonate
phosphonate groups
CO 2 cycloaddition
CO 2 cycloaddition reaction
multistep fabrications
NH
Heterogeneously Catalyzing CO 2 ConversionIntegrating
catalysi
metal phosphonate materials
site
alendronate sodium trihydrate
halogen ions
mesoporous metal phosphonates
pore volume
multifunctional catalysts
material science
aziridine
2014-11-07 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Acid_Base_Bifunctional_Periodic_Mesoporous_Metal_Phosphonates_for_Synergistically_and_Heterogeneously_Catalyzing_CO_sub_2_sub_Conversion/2237437
Integrating
multiple functions into one host for improved catalytic
performance is challenging and promising for both catalysis and material
science. Herein a new acid–base bifunctional periodic mesoporous
titanium phosphonate hybrid material is synthesized by a facile one-pot
hydrothermal method, using alendronate sodium trihydrate as a coupling
molecule. The new material possesses highly periodic mesopores with
a large specific surface area of 540 m<sup>2</sup> g<sup>–1</sup> and pore volume of 0.43 cm<sup>3</sup> g<sup>–1</sup>, favoring
the smooth mass transport of reactants and products during the catalytic
reaction. It also has an organic–inorganic hybrid framework
with homogeneously incorporated phosphonate groups, in which a large
number of accessible acidic P–OH and basic −NH<sub>2</sub> sites can, respectively, activate aziridine and CO<sub>2</sub>,
synergistically leading to the high conversion (>99%), yield (98%),
and regioselectivity (98:2) for the CO<sub>2</sub> cycloaddition reaction.
The catalytic activity is better than that of the scarcely reported
heterogeneous catalysts for aziridine and CO<sub>2</sub> cycloaddition
and even comparable to that of the state-of-the-art homogeneous ones.
Moreover, being superior to the other catalysts, the metal phosphonate
materials can be easily separated and reused repeatedly without activity
loss, and no hazardous halogen ions, organic solvents, or cocatalysts
are needed for the catalytic process. In comparison with previously
reported multifunctional catalysts synthesized by complicated multistep
fabrications, the facile one-pot preparation of mesoporous metal phosphonates
with dual active sites makes it more practical for high-performance
heterogeneous catalysis.