Platinum–copper
bimetallic-modified mordenite catalysts
for the dimethyl ether (DME) carbonylation to methyl acetate (MA)
were carried out using a laboratory-made nanoprism mordenite, which
was synthesized by hydrothermal method and modified by ion exchange
with Cu(NO3)2 and wet impregnation with H2PtCl6. The catalyst was characterized by X-ray
diffraction, inductively coupled plasma atomic emission spectroscopy,
N2O titration, NH3 temperature-programmed desorption,
H2 temperature-programmed reduction, pyridine-infrared,
Fourier transform infrared, Brunauer–Emmett–Teller,
high-resolution transmission electron microscopy, energy-dispersive
spectrometry mapping, scanning electron microscopy, X-ray photoelectron
spectroscopy, and temperature-programmed oxidation. Bimetallic platinum–copper
catalysts exhibited high catalytic activity for carbonylation of DME,
which was attributed to the large quantity of the Brønsted acid
sites in the eight-membered ring (8-MR). Moreover, the bimetallic
catalyst with small copper particle size and bimetallic synergism
promoted conversion of DME and MA selectivity. Over the 1Pt/Cu-mor
catalyst (1 wt % Pt and 2 wt % Cu), DME conversion and MA selectivity
reached 86.0% and 96.0%, respectively. What’s more, the addition
of Pt reduced the acidity of the 12-membered ring (12-MR) in the Cu-mor
catalyst, resulting in a suppression of hard coke formation.
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