Deng-Yang Jan

Synthesis, characterization, and applications of the new zeolite UZM-5

Abstract A new zeolite, UZM-5, has been recently reported and assigned the IZA structure code UFI. Materials with different morphologies ranging from a plate-like structure to rosettes can be obtained by varying the synthesis conditions. Adsorption IR measurements McBain adsorption, and microreactor testing determined accessibility of external and internal acid sites consistent with the structure. Catalytic activity testing and multiple probe molecule adsorption studies indicate primarily external surface reactivity. Bronsted/Lewis acid site ratio and acid strength distribution can be varied through the control of morphology for optimized efficiency for targeted applications.

UZM-4: A stable si-rich form of the BPH framework type

Abstract The zeolite UZM-4 is an organic templated form of the large pore, 12-ring BPH framework type (Si/Al=1.5–2.5), that is more stable than the isostructural Linde Q (Si/Al=1.1). Powder X-ray diffraction and adsorption properties are consistent with this framework type. Occluded cations, both inorganic and organic, are readily ion-exchanged without calcination. Extensive modification attempts (ammonium fluorosilicate treatment, steaming, acidic NH 4 -exchange) have produced stable, active acid catalysts.