In methanol-to-propylene reaction, the catalytic performance of ZSM-5 zeolite is strongly related to the material textural properties and surface acidity. In this work, the regulation of framework Al distribution (origin of the active Brønsted acid sites) in high-silica hierarchically structured ZSM-5 zeolite has been realized by a boron-modification procedure. When the B/Al ratio of the gel compositions (Si/Al = 200) reaches 7 or 9, the resultant B₇- and B₉-HSZ materials possess the expected hierarchically micro/mesoporous structures and increased framework Al distribution in the narrow straight/sinusoidal channels of MFI-type zeolite, which have been confirmed by the complementary characterizations, i.e. XRD, N₂ sorption isotherms, ICP-OES, SEM, TEM, ²⁷Al MAS NMR and the probe reaction of 1-hexene cracking. As a result, compared to the unmodified sample B₀-HSZ and sample B₃-HSZ with lower B-doping amount in the gels, they demonstrate the improved target propylene selectivity (49.3 % and 48.9 %) and elongated catalyst lifetime (88 h and 91 h) in MTP reaction under the WHSV of 2.8 h⁻¹.

在甲醇制丙烯反应中，ZSM-5沸石的催化性能与材料的质构性质和表面酸性密切相关。在这项工作中，通过硼改性程序已经实现了对高二氧化硅分级结构的ZSM-5沸石中骨架Al分布（活性布朗斯台德酸位点的起源）的调节。当凝胶组合物的B / Al之比（Si / Al = 200）达到7或9时，所得的B _7-和B ₉ -HSZ材料具有预期的分层微/介孔结构，并在狭窄的直面上增加了骨架Al的分布MFI型沸石的正弦通道，已通过互补特征（即XRD，N ₂吸附等温线，ICP-OES，SEM，TEM，²⁷ Al MAS NMR与1-己烯裂解的探针反应。结果，与凝胶中具有较低B掺杂量的未改性样品B ₀ -HSZ和样品B ₃ -HSZ相比，它们证明了提高的目标丙烯选择性（49.3％和48.9％）和更长的催化剂寿命（88小时） WHSV为2.8 h ^-1时，MTP反应的反应时间为91和91 h）。