Self-Stirring Microcatalysts: Large-Scale, High-Throughput, and Controllable Preparation and Application

Abstract

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.

Embedding Hierarchical Pores by Mechanochemistry in Carbonates with Superior Chemoselective Catalysis and Stability

“…This inevitably, however, generates massive dye wastewater. However, the combination of various materials (SrTiO 3 , graphene oxide, MoS 2 , metal-organic frameworks) and small Pd nanoparticles as highly functional catalysts has extensively applied in the degrading of dyes, which is a typical selective hydrogenation process. − Hence, the Pd/H-CaCO 3 with fine size (3.62 nm) and uniformly dispersion of Pd nanoparticle can be implemented in the highly degradation of various dyes, in view of its various excellent properties and to better facilitate the industrial application. Figure a depicts the procedure of the catalyst degradation in simulated solution of RH and MB.…”