A high precision gas flow cell for performing in situ neutron studies of local atomic structure in catalytic materials
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Colorado State Univ., Fort Collins, CO (United States)
Gas-solid interfaces enable a multitude of industrial processes, including heterogeneous catalysis; however, there are few methods available for studying the structure of this interface under operating conditions. Here, we present a new sample environment for interrogating materials under gas-flow conditions using time-of-flight neutron scattering under both constant and pulse probe gas flow. Outlined are descriptions of the gas flow cell and a commissioning example using the adsorption of N2 by Ca-exchanged zeolite-X (Na78–2xCaxAl78Si144O384,x ≈ 38). We demonstrate sensitivities to lattice contraction and N2 adsorption sites in the structure, with both static gas loading and gas flow. A steady-state isotope transient kinetic analysis of N2 adsorption measured simultaneously with mass spectrometry is also demonstrated. In the experiment, the gas flow through a plugged-flow gas-solid contactor is switched between 15N2 and 14N2 isotopes at a temperature of 300 K and a constant pressure of 1 atm; the gas flow and mass spectrum are correlated with the structure factor determined from event-based neutron total scattering. As a result, available flow conditions, sample considerations, and future applications are discussed.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725; LDRD Seed #7735
- OSTI ID:
- 1376356
- Alternate ID(s):
- OSTI ID: 1373971
- Journal Information:
- Review of Scientific Instruments, Vol. 88, Issue 3; ISSN 0034-6748
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
A high temperature gas flow environment for neutron total scattering studies of complex materials
|
journal | September 2018 |
A uniaxial load frame for in situ neutron studies of stress-induced changes in cementitious materials and related systems
|
journal | September 2018 |
Advances in utilizing event based data structures for neutron scattering experiments
|
journal | September 2018 |
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