The procedure
for the synthesis of PtM-containing MFI zeolite was similar to that
of Pt-MFI. The difference is that, before the addition of H2PtCl6 and ethylenediamine, 19 mg CuCl2 (98%,
MERYER) or 58 mg Fe(NO3)3·9H2O (99.9%, Macklin) or 36 mg NiC4H6O4·4H2O (98%, SINOPHARM) was doped into the hydrolysis
solution, and kept stirring for 30 min at room temperature. Then,
H2PtCl6 and ethylenediamine were added to the
mixture, and the rest of the procedures were the same as that for
the preparation of the Pt-MFI sample.
Fe-MFI reference sample
was also prepared in a procedure similar to Pt-MFI. After 9 h of stirring
of the mixture of TPAOH, TEOS, and KCl, 58 mg of Fe(NO3)3·9H2O (99.9%, Macklin) was added into
the mixture, followed by stirring for 20 min. Then, 150 μL of
ethylenediamine (99%, ThermoFisher) was added to the above solution
followed by stirring for 30 min. Afterward, the resultant solution
was transferred into Teflon-lined autoclaves and heated in the oven
at 175 °C for 4 days. The treatments after the hydrothermal synthesis
(sample washing, separation, calcination, and reduction procedures)
were the same as that of the synthesis of Pt-MFI sample.
for the synthesis of PtM-containing MFI zeolite was similar to that
of Pt-MFI. The difference is that, before the addition of H2PtCl6 and ethylenediamine, 19 mg CuCl2 (98%,
MERYER) or 58 mg Fe(NO3)3·9H2O (99.9%, Macklin) or 36 mg NiC4H6O4·4H2O (98%, SINOPHARM) was doped into the hydrolysis
solution, and kept stirring for 30 min at room temperature. Then,
H2PtCl6 and ethylenediamine were added to the
mixture, and the rest of the procedures were the same as that for
the preparation of the Pt-MFI sample.
Fe-MFI reference sample
was also prepared in a procedure similar to Pt-MFI. After 9 h of stirring
of the mixture of TPAOH, TEOS, and KCl, 58 mg of Fe(NO3)3·9H2O (99.9%, Macklin) was added into
the mixture, followed by stirring for 20 min. Then, 150 μL of
ethylenediamine (99%, ThermoFisher) was added to the above solution
followed by stirring for 30 min. Afterward, the resultant solution
was transferred into Teflon-lined autoclaves and heated in the oven
at 175 °C for 4 days. The treatments after the hydrothermal synthesis
(sample washing, separation, calcination, and reduction procedures)
were the same as that of the synthesis of Pt-MFI sample.