TY - JOUR
T1 - Non-thermal calcination by ultraviolet irradiation in the synthesis of microporous materials
AU - Parikh, Atul N.
AU - Navrotsky, Alexandra
AU - Li, Qinghua
AU - Yee, Chanel K.
AU - Amweg, Meri L.
AU - Corma, A.
N1 - Funding Information:
We thank Dr. H. Fan, Sandia National Laboratories, for help with surface area measurements. This work received support from the National Science Foundation. ANP, MLA, and CKY acknowledges support from University of California, Davis and the Office of Science at the US Department of Energy.
PY - 2004/12/1
Y1 - 2004/12/1
N2 - We describe a new photochemical method near room temperature conditions for the removal of organic structure-directing agents in the synthesis of microporous materials. The method relies on the exposure of the sample to short-wavelength ultraviolet (UV) radiation in air and the ozone environment generated by a medium pressure mercury lamp (184-257nm). The generality of the approach has been confirmed using three test-cases of microporous materials: a high-silica synthetic zeolite, an aluminophosphate, and a Ge-substituted microporous silica. The structures and organic contents of the microporous materials before and after UV/ ozone treatment were determined using a combination of X-ray diffraction, Fourier-transform infrared spectroscopy, thermogravimetry, and nitrogen adsorption isotherms. For all three cases, the UV/Ozone treatment allows complete removal of the organic template while retaining the inorganic framework. The overall integrity of the microporous materials was comparable to or better than for materials derived by thermal calcination. This method is applicable in making new materials from organic-inorganic precursors and holds promise for microporous thin films on thermally sensitive substrates and for controlled spatial patterning.
AB - We describe a new photochemical method near room temperature conditions for the removal of organic structure-directing agents in the synthesis of microporous materials. The method relies on the exposure of the sample to short-wavelength ultraviolet (UV) radiation in air and the ozone environment generated by a medium pressure mercury lamp (184-257nm). The generality of the approach has been confirmed using three test-cases of microporous materials: a high-silica synthetic zeolite, an aluminophosphate, and a Ge-substituted microporous silica. The structures and organic contents of the microporous materials before and after UV/ ozone treatment were determined using a combination of X-ray diffraction, Fourier-transform infrared spectroscopy, thermogravimetry, and nitrogen adsorption isotherms. For all three cases, the UV/Ozone treatment allows complete removal of the organic template while retaining the inorganic framework. The overall integrity of the microporous materials was comparable to or better than for materials derived by thermal calcination. This method is applicable in making new materials from organic-inorganic precursors and holds promise for microporous thin films on thermally sensitive substrates and for controlled spatial patterning.
KW - Calcination
KW - Structure directing agent
KW - Template removal
KW - Ultraviolet irradiation
KW - Zeolite
UR - http://www.scopus.com/inward/record.url?scp=7944226256&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=7944226256&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2004.07.032
DO - 10.1016/j.micromeso.2004.07.032
M3 - Article
AN - SCOPUS:7944226256
SN - 1387-1811
VL - 76
SP - 17
EP - 22
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
IS - 1-3
ER -