Herein, we introduce a strategy to develop a kind of
unprecedented
microcatalyst, which owns self-stirring and catalytic performance
based on pneumatic printing and magnetic field induction technology.
A spindle-shaped microcatalyst based on metal–organic frameworks
(MOFs) with a certain aspect ratio and size can be obtained by tuning
the printing parameters and the intensity of the magnetic field. One
nozzle can print 18 000 microcatalysts per hour, which provides
a prerequisite for the realization of large-scale production in the
industrial field. Furthermore, this strategy can be widely applied
to a variety of other heterogeneous catalysts, such as mesoporous
SiO2, zeolite, metallic oxide, and so on. To demonstrate
the superiority of the printed catalyst, the series of printed microcatalysts
were evaluated by various catalytic reactions including liquid-phase
hydrogenation, microdroplet dye-fading, and photocatalytic degradation
in microreactor, all of which exhibited excellent catalytic performance.
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