Isomorphous boron-substituted HZSM-5 ([B,H]ZSM-5) zeolite was directly synthesized by a solid-phase method, and its properties were characterized by XRD, FE-SEM, N₂ adsorption/desorption, FT-IR, ICP-AES, NH₃-TPD, py-FTIR, TG, GC-MS, solid MAS-NMR, and UV-vis of Co²⁺. It was found that the acid distribution was tuned, and the Al_F siting was changed when boron was introduced into the ZSM-5 framework, which significantly affected the catalytic performance of BHZ samples in the MTP reaction. The preferential occupation of boron atoms in the channel intersections and sinusoidal channels caused Al_F to be sited in the straight and sinusoidal channels, which simultaneously tuned acid distribution and weakened the acid strength in the channel intersections. These changes tuned the dual-cycle mechanism of the MTP reaction, resulting in a lower carbon deposition rate and longer lifetime for BHZ samples, especially for 2.5-BHZ, by comparison with HZ samples.

中文翻译：

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固相法直接合成[B，H] ZSM-5：AlF定位和在MTP反应中的催化性能

固相法直接合成了同晶硼取代的HZSM-5（[B，H] ZSM-5）沸石，并通过XRD，FE-SEM，N ₂吸附/解吸，FT-IR， ICP-AES，NH ₃ -TPD，py-FTIR，TG，GC-MS，固体MAS-NMR和Co ^2+的紫外可见光。发现将硼引入ZSM-5骨架后，酸分布得到了调整，Al _F位置发生了变化，这显着影响了BHZ样品在MTP反应中的催化性能。通道交叉点和正弦通道中硼原子的优先占据导致Al _F被放置在笔直和正弦通道，这同时调整酸分布并削弱了通道交叉口的酸强度。这些变化调整了MTP反应的双循环机制，与HZ样品相比，BHZ样品，尤其是2.5-BHZ样品，具有更低的碳沉积速率和更长的使用寿命。