ZSM-22 zeolites with needle-shaped, bundle-shaped, as well as bulk-shaped morphologies are prepared by tuning hydrothermal synthesis conditions. These as-synthesized zeolites have similar crystallinity, Si/Al ratios and micropores revealed by XRD, XRF and BET. However, the oriented fusion of nanorods in the bundle-shaped ZSM-22 zeolite leads to the formation of more framework aluminum atoms over T1 + T2 + T3 sites on the 10-membered rings than that of needle-shaped ZSM-22 zeolite as detected by the ²⁷Al 2D 3Q MAS NMR. The acidity properties determined by Py-FTIR and DMPy-FTIR show that the interfacial effect between the adjacent nanorods can effectively suppress Brönsted acid strength at the pore mouths and external surface. Interestingly, more Lewis acid sites are generated due to the interfacial defects. As a result, the Pt/Z-BUN catalyst with the weaker acidity and high dispersion of Pt exhibits the highest isomerization selectivity due to the more balanced bifunctionality between acid sites and metal sites among the as-prepared catalysts.

通过调节水热合成条件，可制得具有针状，束状以及块状形态的ZSM-22沸石。这些刚合成的沸石具有相似的结晶度，Si / Al比和XRD，XRF和BET显示的微孔。然而，纳米棒在束状ZSM-22沸石中的定向融合导致在10元环的T1 + T2 + T3位置上形成的骨架铝原子比针状ZSM-22沸石更多。由²⁷Al 2D 3Q MAS NMR。通过Py-FTIR和DMPy-FTIR测定的酸度特性表明，相邻纳米棒之间的界面作用可以有效抑制孔口和外表面的布朗斯台德酸强度。有趣的是，由于界面缺陷，产生了更多的路易斯酸位点。结果，由于所制备的催化剂中酸位和金属位之间的更平衡的双官能度，具有较弱的酸度和高的Pt分散性的Pt / Z-BUN催化剂表现出最高的异构化选择性。