Theoretical Determination of Size Effects in Zeolite-Catalyzed Alcohol Dehydration

Kunz, Larissa Y.; Bu, Lintao; Knott, Brandon C.; Liu, Cong; Nimlos, Mark R.; Assary, Rajeev S.; Curtiss, Larry A.; Robichaud, David J.; Kim, Seonah

doi:10.3390/catal9090700

Title: Theoretical Determination of Size Effects in Zeolite-Catalyzed Alcohol Dehydration

Journal Article · Wed Aug 21 00:00:00 EDT 2019 · Catalysts

DOI:https://doi.org/10.3390/catal9090700· OSTI ID:1567023

Kunz, Larissa Y. ^[1]; Bu, Lintao ^[1]; Knott, Brandon C. ^[1]; Liu, Cong ^[2];

^[1]; Assary, Rajeev S. ^[2]; Curtiss, Larry A. ^[2];

^[1];

^[1]

National Renewable Energy Lab. (NREL), Golden, CO (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)

In the upgrading of biomass pyrolysis vapors to hydrocarbons, dehydration accomplishes a primary objective of removing oxygen, and acidic zeolites represent promising catalysts for the dehydration reaction. Here, we utilized density functional theory calculations to estimate adsorption energetics and intrinsic kinetics of alcohol dehydration over H-ZSM-5, H-BEA, and H-AEL zeolites. The ONIOM (our Own N-layered Integrated molecular Orbital and molecular Mechanics) calculations of adsorption energies were observed to be inconsistent when benchmarked against QM (Quantum Mechanical)/Hartree–Fock and periodic boundary condition calculations. However, reaction coordinate calculations of adsorbed species and transition states were consistent across all levels considered. Comparison of ethanol, isopropanol (IPA), and tert-amyl alcohol (TAA) over these three zeolites allowed for a detailed examination of how confinement impacts on reaction mechanisms and kinetics. The TAA, seen to proceed via a carbocationic mechanism, was found to have the lowest activation barrier, followed by IPA and then ethanol, both of which dehydrate via a concerted mechanism. Barriers in H-BEA were consistently found to be lower than in H-ZSM-5 and H-AEL, attributed to late transition states and either elevated strain or inaccurately estimating long-range electrostatic interactions in H-AEL, respectively. Molecular dynamics simulations revealed that the diffusivity of these three alcohols in H-ZSM-5 were significantly overestimated by Knudsen diffusion, which will complicate experimental efforts to develop a kinetic model for catalytic fast pyrolysis.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Bioenergy Technologies Office

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1567023

Report Number(s):: NREL/JA-2700-74616; CATACJ

Journal Information:: Catalysts, Vol. 9, Issue 9; ISSN 2073-4344

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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