Incorporation of Zr into MCM-48 Mesoporous Silica
J. Phys. Chem. B, Vol. 103, No. 12, 1999 2041
marizing, one can say that a better dispersion of the Zr with a
lower degree of Zr-Zr interactions can be obtained by using
the “grafting” method.
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4
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an ordered pore array with a uniform pore diameter, which are
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catalytic applications, the grafted materials are proposed to be
superior to Zr-MCM-48 since the Zr concentration is control-
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Acknowledgment. Mark Morey thanks Dr. Qisheng Huo
and Dr. Sarah Tolbert for thoughtful discussion. This work was
supported by the National Science Foundation for funding under
Award DMR-9520971 and the Materials Research Laboratories
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(MRL, University of California, Santa Barbara) program of the
National Science Foundation under Award DMR-9123048.
Michael Fr o¨ ba thanks HASYLAB for allocating beamtime and
Dr. Thorsten Ressler (U Hamburg, LLNL) for help during the
XAFS measurements.
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