Natural Abundance 17O DNP NMR Provides Precise O−H Distances and Insights into the Brønsted Acidity of Heterogeneous Catalysts

Thumbnail Image
Perras, Frédéric
Wang, Zhuoran
Naik, Pranjali
Pruski, Marek
Major Professor
Committee Member
Journal Title
Journal ISSN
Volume Title
Wiley-VCH VerlagGmbH & Co. KGaA, Weinheim
Slowing, Igor
Research Projects
Organizational Units
Organizational Unit

The Department of Chemistry seeks to provide students with a foundation in the fundamentals and application of chemical theories and processes of the lab. Thus prepared they me pursue careers as teachers, industry supervisors, or research chemists in a variety of domains (governmental, academic, etc).

The Department of Chemistry was founded in 1880.

Dates of Existence

Related Units

Organizational Unit
Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.

Journal Issue
Is Version Of
Heterogeneous Brønsted acid catalysts are tremendously important in industry, particularly in catalytic cracking processes. Here we show that these Brønsted acid sites can be directly observed at natural abundance by 17O DNP surface-enhanced NMR spectroscopy (SENS). We additionally show that the O−H bond length in these catalysts can be measured with sub-picometer precision, to enable a direct structural gauge of the lability of protons in a given material, which is correlated with the pH of the zero point of charge of the material. Experiments performed on materials impregnated with pyridine also allow for the direct detection of intermolecular hydrogen bonding interactions through the lengthening of O−H bonds.
This is the peer-reviewed version of the following article: Perras, Frédéric A., Zhuoran Wang, Pranjali Naik, Igor I. Slowing, and Marek Pruski. "Natural Abundance 17O DNP NMR Provides Precise O− H Distances and Insights into the Brønsted Acidity of Heterogeneous Catalysts." Angewandte Chemie International Edition 56, no. 31 (2017): 9165-9169, which has been published in final form at DOI: 10.1002/anie.201704032. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. Copyright 2017 Wiley-VCH VerlagGmbH & Co. KGaA, Weinheim. Posted with permission.