With an aim to set up acid-base functionalities in mesoporous SBA-15, herein we report one pot hydrothermal synthetic strategy to incorporate LaPO₄ into SBA-15 (LaP-SBA-15). ICP-OES and EDX results confirmed successful incorporation of large amount of LaPO₄ in SBA-15. The small angle XRD, N₂-isotherms and TEM studies unveiled the presence of ordered mesoporous and its characteristic features in LaP-SBA-15 catalysts. The incorporated LaPO₄ is existed in monoclinic phase which is authenticated by wide angle XRD and FT-IR results. In addition to this, electron microscope images of LaP-SBA-15 catalysts clearly illustrate the crystalline growth of monoclinic LaPO₄ nanoparticles across the hexagonal mesopore channels of SBA-15. NH₃/CO₂ -TPD demonstrated existence of both surface acidic and basic sites which are imparted to SBA-15 through LaPO₄ incorporation. LaP-SBA-15 catalysts have been evaluated for the selective O-alkylation of phenol with methanol in continuous process. LaP-SBA-15 catalysts offer excellent catalytic activity and selectivity towards anisole. The surface acidic and basic sites could be tuned by adjusting the LaPO₄ content, which leads to the tunable selectivity in the O-methylation of phenol. Especially, 30 wt % LaP-SBA- 15 catalyst exhibited constant selectivity to anisole up to 16 h of time-on-stream. This superior catalytic performance of 30 wt% LaP-SBA-15 catalyst is attributed to dispersion of balanced amount weak acidic and moderate basic sites through mesopores and the transportation of reactant and product molecules through uniform channels of SBA-15 containing LaPO₄.

为了在中孔SBA-15中建立酸碱官能团，我们在此报告了一种将LaPO ₄掺入SBA-15（LaP-SBA-15）的锅法水热合成策略。ICP-OES和EDX结果证实，成功将大量LaPO ₄掺入SBA-15中。小角XRD，N _2等温线和TEM研究揭示了LaP-SBA-15催化剂中有序介孔的存在及其特征。掺入的LaPO ₄以单斜晶相存在，其通过广角XRD和FT-IR结果验证。除此之外，LaP-SBA-15催化剂的电子显微镜图像清楚地说明了单斜LaPO ₄的晶体生长穿过SBA-15六角形中孔通道的纳米颗粒。NH ₃ / CO ₂ -TPD证实了存在表面酸性和碱性位点，它们通过掺入LaPO ₄赋予SBA-15 。已对LaP-SBA-15催化剂在连续过程中对苯酚与甲醇的选择性O-烷基化进行了评估。LaP-SBA-15催化剂具有出色的催化活性和对茴香醚的选择性。可以通过调整LaPO ₄来调整表面的酸性和碱性位点含量，导致苯酚的O-甲基化选择性可调。特别地，高达16小时的运行时间，30wt％的LaP-SBA-15催化剂表现出对茴香醚的恒定选择性。30 wt％LaP-SBA-15催化剂的这种优越的催化性能归因于平衡量的弱酸性和中等碱性位点通过中孔的分散以及反应物和产物分子通过含LaPO ₄的SBA-15的均匀通道的传输。