Zr Mesoporous Molecular Sieves as Novel Solid Acid Catalysts
Nedumaran and Pandurangan
Table VIII. Leaching study.
Runs
Fresh
1
2
3
4
Sulfur content CHNS (XRF) wt%
1.817(1.899)
96
1.781(1.887)
91
1.779(1.884)
89
1.776(1.88)
90
1.77(1.877)
88
%
Selectivity of Nitrile
ꢀ
Notes: Reaction Conditions: 5 mmol salicylaldoxime, 0.20 g of catalyst SAZrM, 20 ml Acetonitrile: 150 C: 6 h/run.
The sulfur content reduced (from 1.899% to 1.879%) by
.05% for the catalyst in the first run. The reactivated cat-
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1
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alyst after four runs showed only 1.15% sulfur leaching.
Therefore, the leaching study revealed the sulfur loaded
on the surface which was not interacting with Zr expelled
after the first run. But in consecutive runs sulfur interact-
ing with Zr ion of the mesoporous sieve did not show
any leaching. This leaching study results also agree with
CHNS elemental analysis results
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4
. CONCLUSION
In summary we have established super acidity in Si-MCM-
1 by frame work incorporation of Zr and subsequent sul-
4
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intra pores which make the material as bimodal. SAZrM
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(
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(
2
2
Acknowledgment: The authors are thankful to the
Department of chemistry, (DST) Anna University Chen-
nai and Indian Institute of Technology-Madras (SAIF) for
providing the instrumentation facilities.
(
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