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LÜ ET AL.
3.4 | Catalysts reuse and stability
scientific and technological activities of overseas students
in Shaanxi Province (Grant No. 2017046), Natural Science
Basic Research Plan in Shaanxi Province of China
(Program No. 17JK0096), SAFEA: High-End Foreign
Experts Project (Program No. GDW20186100251 and
No. G20190027043) and the Fundamental Research Funds
for the Central Universities (Program No. 300102298102).
The separability and stability are very important for the
reuse of catalysts. Therefore, we chose four catalysts:
CP1, CP2, CP4 and CP6 as catalysts for the oxidation of
the ethylbenzene reaction under the same conditions.
The supernatant of the four centrifuge tubes was almost
colorless, indicating that in the catalytic process to
achieve a heterogeneous catalyst (see Figure S5). Four
catalysts could be easily recycled after reaction by centri-
fugation, filtration, desiccation or other simple separation
methods. The stabilities of heterogeneous catalysts CP1,
CP2, CP4 and CP6 were examined through repeated oxi-
dations of ethylbenzene using TBHP (Figure 10). The
results (Table 5) showed that CP1, CP2, CP4 and CP6
efficiently catalyzed the conversion of ethylbenzene to
the only product acetophenone quantitatively in 79%,
70%, 65% and 88% yield after three cycles, respectively.
Compared with the initial catalytic efficiency, these four
catalysts were consecutively reused three times, with only
a slight decrease in catalytic activities, however, without
detectable catalysts leaching.
ORCID
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4 | CONCLUSIONS
In summary, we synthesized seven heterogeneous meta-
lloporphyrin polymers of CP1–CP7 based on H2TZP,
which were able to selectively oxidize ethylbenzene,
1,2,3,4-tetrahydronaphthalene and diphenylmethane
exclusively to corresponding ketone, especially by CP1,
CP2, CP4 and CP6. Among these metalloporphyrins
polymers, metal atoms in metalloporphyrin polymers
mainly effected the catalytic activities of CP1–CP7,
which can coordinate with both pyrrolic N in the porphy-
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metal atoms have an important influence on the meso-
pore and macropore size distribution by different interac-
tions between metal and N atoms. On the other side,
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interactions with t-BuOOH. Among these meta-
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excellent heterogeneous catalyst for oxidation of
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ACKNOWLEDGEMENTS
This research was financially supported by China Postdoc-
toral Science Foundation (Program No. 2018 M560740
and No. 2019 T120873), the preferential funding for