A series of conjugated microporous polymers (CMPs) based on bromophenol blue (BB) and bromocresol green (BG) have been synthesized via the Sonogashira–Hagihara cross-coupling reaction with surface areas of up to 747 m²/g. The CMPs can be post-functionalized with chlorosulfonic acid to yield corresponding sulfonated polymers with a high acidity of up to 7.67 mmol/g. The sulfonated CMPs showed excellent catalytic activity for the esterification of free fatty acids and transesterification of various vegetable oils and waste cooking oils as well as excellent reusability of up to four consecutive runs without significant activity loss. These sulfonated CMPs have potential applications as recyclable acid catalysts for environmentally friendly biodiesel production from waste cooking oil.

中文翻译：

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酸官能化共轭微孔聚合物作为生物柴油生产的可重复使用催化剂

通过Sonogashira-Hagihara交叉偶联反应合成了一系列基于溴酚蓝（BB）和溴甲酚绿（BG）的共轭微孔聚合物（CMP），表面积最大为747 m ² / g。CMP可以用氯磺酸进行后官能化，以产生相应的磺化聚合物，其酸度高达7.67mmol / g。磺化的CMP对游离脂肪酸的酯化以及各种植物油和废食用油的酯交换反应均显示出优异的催化活性，并且可以连续多达四次运行而具有出色的重用性，而活性却没有显着降低。这些磺化的CMP具有潜在的应用前景，可用于从废食用油生产环保型生物柴油的可循环酸催化剂。