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Title: Pore diameter dependence of catalytic activity: p-nitrobenzaldehyde conversion to an aldol product in amine-functionalized mesoporous silica

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.5037618· OSTI ID:1464469
 [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States). Division of Chemical and Biological Sciences, and Dept. of Physics and Astronomy
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States). Division of Chemical and Biological Sciences, and Dept. of of Chemistry

The reaction yield for conversion of p-nitrobenzaldehyde (PNB) to an aldol product in amine-functionalized mesoporous silica nanoparticles (MSN) exhibits a 20-fold enhancement for a modest increase in pore diameter, d. This enhanced catalytic activity is shown to reflect a strong increase in the “passing propensity,” P, of reactant and product species inside the pores. We find that P ≈ 0, corresponding to single-file diffusion, applies for the smallest d which still significantly exceeds the linear dimensions of PNB and the aldol product. However, in this regime of narrow pores, these elongated species must align with each other and with the pore axis in order to pass. Thus, P reflects both translational and rotational diffusion. Langevin simulation accounting for these features is used to determine P versus d. The results are also augmented by analytic theory for small and large d where simulation is inefficient. The connection with the catalytic activity and yield is achieved by the incorporation of results for P into a multi-scale modeling framework. Specifically, we apply a spatially coarse-grained (CG) stochastic model for the overall catalytic reaction-diffusion process in MSN. Pores are treated as linear arrays of cells from the ends of which species adsorb and desorb, and between which species hop and exchange, with the exchange rate reflecting P. CG model predictions including yield are assessed by Kinetic Monte Carlo simulation.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1464469
Alternate ID(s):
OSTI ID: 1459478
Report Number(s):
IS-J-9645
Journal Information:
Journal of Chemical Physics, Vol. 149, Issue 2; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (3)

Terbium extraction by functionalized surface: experimental and DFT approach journal November 2019
Perspective: Computational chemistry software and its advancement as illustrated through three grand challenge cases for molecular science journal November 2018
Inter- and Intramolecular Cooperativity Effects in Alkanolamine-Based Acid–Base Heterogeneous Organocatalysts journal January 2019

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