抄録
Honeycomb monoliths were prepared from ZSM-5 powders synthesized under hydrothermal conditions using microporous silica obtained by selective leaching of metakaolinite. This honeycomb material was compared with monoliths prepared using TEOS as the silica source. The honeycomb monoliths were formed by extrusion of paste made from the synthesized powders through a multi-channel honeycomb die. ZSM-5 monoliths prepared from metakaolinite displayed an absence of secondary growth and platy morphology, indicating a greater of preferred orientation of the crystals in the extruded surface. The twinned morphology of ZSM-5 derived from TEOS contributed more to the external surface area even though the total surface area was same. The effect of thermal stability, solid acidity and mechanical strength of the powder, monoliths and coated honeycombs are discussed. The results show that leached metakaolinite is a cost-effective raw material for preparing ZSM-5 honeycomb monoliths with varying Al2O3/SiO2 ratios and controlled morphology.
