skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Reversible Formation of Silanol Groups in Two-Dimensional Siliceous Nanomaterials under Mild Hydrothermal Conditions

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2];  [3];  [4];  [4]; ORCiD logo [5]; ORCiD logo [1]; ORCiD logo [6]; ORCiD logo [7]
  1. Univ. of Delaware, Newark, DE (United States)
  2. Univ. of Minnesota, Minneapolis, MN (United States); Chonnam National Univ., Gwangju (Korea, Republic of)
  3. Catalysis Center for Energy Innovation, University of Delaware, 221 Academy Street, Newark, Delaware 19716 United States
  4. Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States)
  6. Univ. of Delaware, Newark, DE (United States); Univ. of Minnesota, Minneapolis, MN (United States); Johns Hopkins Univ., Baltimore, MD (United States)
  7. Univ. of Delaware, Newark, DE (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

Monitoring the effects of mild hydrothermal conditions, in situ, on siliceous materials remains challenging using surface science techniques, which often require electrically conductive substrates. The emergence of two-dimensional (2-D) siliceous nanomaterials deposited on metal single crystals overcomes this limitation. Here, we use infrared reflection absorption spectroscopy (IRRAS) to study the effects of mild hydrothermal conditions, in situ, on 2-D model systems, namely, all-Si MFI nanosheets supported on Au(111) and a polymorphous bilayer silicate supported on Ru(0001). We find that the formation of silanol groups (SiOH) occurs at 473 and 573 K under a H2O pressure of 3 mbar in the MFI nanosheets, but not in the polymorphous bilayer silicate. The effects of mild hydrothermal conditions are reversible in the MFI nanosheets and do not result in framework degradation. Implications shown here provide a fundamental understanding of the impact of mild hydrothermal conditions on the 2-D siliceous nanomaterials and serve as a starting point when considering these effects on three-dimensional (3-D) ones.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; SC0001004
OSTI ID:
1670664
Report Number(s):
BNL-219914-2020-JAAM
Journal Information:
Journal of Physical Chemistry. C, Vol. 124, Issue 33; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (36)

From Microporous to Mesoporous Molecular Sieve Materials and Their Use in Catalysis journal October 1997
Ordered porous materials for emerging applications journal June 2002
Renewable p -Xylene from 2,5-Dimethylfuran and Ethylene Using Phosphorus-Containing Zeolite Catalysts journal January 2017
Dispersible Exfoliated Zeolite Nanosheets and Their Application as a Selective Membrane journal October 2011
Sorption of volatile organic compounds on hydrophobic zeolites journal April 2000
Evaluation of hybrid silica sols for stable microporous membranes using high-throughput screening journal April 2010
Long-term steam stability of MWW structure zeolites (MCM-22 and ITQ-1) journal July 2014
Steam‐Induced Coarsening of Single‐Unit‐Cell MFI Zeolite Nanosheets and Its Effect on External Surface Brønsted Acid Catalysis journal April 2020
Combined solid-state NMR, FT-IR and computational studies on layered and porous materials journal January 2018
Tutorial on Powder X-ray Diffraction for Characterizing Nanoscale Materials journal July 2019
The Silica–Water Interface: How the Silanols Determine the Surface Acidity and Modulate the Water Properties journal February 2012
Exploring Zeolite Chemistry with the Tools of Surface Science: Challenges, Opportunities, and Limitations journal September 2014
Modeling Zeolites with Metal-Supported Two-Dimensional Aluminosilicate Films journal April 2012
Thin silica films on Ru(0001): monolayer, bilayer and three-dimensional networks of [SiO4] tetrahedra journal January 2012
Support effects on the atomic structure of ultrathin silica films on metals journal April 2012
Beyond Ordered Materials: Understanding Catalytic Sites on Amorphous Solids journal October 2017
Solution-processable exfoliated zeolite nanosheets purified by density gradient centrifugation journal May 2013
Ultra-selective high-flux membranes from directly synthesized zeolite nanosheets journal March 2017
Conversion of Methanol and Glycerol into Gasoline via ZSM-5 Catalysis journal November 2013
para -Xylene Ultra-selective Zeolite MFI Membranes Fabricated from Nanosheet Monolayers at the Air-Water Interface journal December 2017
Large-Grain, Oriented, and Thin Zeolite MFI Films from Directly Synthesized Nanosheet Coatings journal May 2018
Studying two-dimensional zeolites with the tools of surface science: MFI nanosheets on Au(111) journal February 2017
FT-IR Evidence of Two Distinct Protonic Sites in BEA Zeolite: Consequences on Cationic Exchange and on Acido-Basic Properties in the Presence of Cesium journal June 2008
Surficial Siloxane-to-Silanol Interconversion during Room-Temperature Hydration/Dehydration of Amorphous Silica Films Observed by ATR-IR and TIR-Raman Spectroscopy journal February 2016
New insights in the formation of silanol defects in silicalite-1 by water intrusion under high pressure journal January 2010
Steaming of Zeolite BEA and Its Effect on Acidity: A Comparative NMR and IR Spectroscopic Study journal April 2011
The surface chemistry of amorphous silica. Zhuravlev model journal November 2000
Insights into Silica Bilayer Hydroxylation and Dissolution journal November 2016
Fast room temperature lability of aluminosilicate zeolites journal October 2019
Hydroxylation of Metal-Supported Sheet-Like Silica Films journal April 2013
Temperature dependence of IR absorption of OH species in clinopyroxene journal September 2010
Electron stimulated hydroxylation of a metal supported silicate film journal January 2016
Quantification of Water and Silanol Species on Various Silicas by Coupling IR Spectroscopy and in-Situ Thermogravimetry journal May 2009
Adsorption of water and 18 O exchange of surface hydroxyl groups on silica journal August 1970
Infrared studies of reactions on oxide surfaces. 7. Mechanism of the adsorption of water and ammonia on dehydroxylated silica journal December 1976
Novel aspects of mid and far IR Fourier spectroscopy applied to surface and adsorption studies on SiO2 journal September 1987