Abstract In this study, conversion of n-propanal to produce 2-methyl-2-pentenal (C6 compound, a fuel range precursor) was carried out using AMW-SBA-15 catalyst synthesized from activated marble waste (AMW) consisting mainly of Ca2+ and Mg2+ ions. AMW-SBA-15 catalysts with different weight ratios of AMW/Si (6, 12, and 18 wt. %) were prepared using single step sol-gel method. The catalytic activities were examined using a fixed bed continuous reactor over temperature ranging from 350−425 °C under atmospheric pressure. The 12AMW-SBA-15 catalysts showed superior catalytic performance with n-propanal conversion of 75 % and C-6 compound selectivity of 81 % at 375 °C without the need of deactivation for 12 h. To elucidate the structure-activity relationship, all catalysts were characterized using a variety of techniques. The superior performance of 12AMW-SBA-15 was ascribed to the high surface area and smaller particle size as well as the high hydrophobicity, which controlled the hydration of Ca2+/Mg2+ ions during the reaction.

中文翻译：

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天然大理石粉末改性 SBA-15 作为一种高效催化剂，用于从正丙醛自醛醇缩合选择性生产 2-甲基-2-戊烯醛

摘要 在本研究中，使用主要由 Ca2+ 组成的活性大理石废料 (AMW) 合成的 AMW-SBA-15 催化剂将正丙醛转化为 2-甲基-2-戊烯醛（C6 化合物，燃料范围前体）。和 Mg2+ 离子。使用单步溶胶-凝胶法制备了具有不同 AMW/Si 重量比（6、12 和 18 重量%）的 AMW-SBA-15 催化剂。在大气压下使用固定床连续反应器在 350-425°C 的温度范围内检查催化活性。12AMW-SBA-15 催化剂表现出优异的催化性能，在 375°C 下，正丙醛转化率为 75%，C-6 化合物选择性为 81%，无需失活 12 小时。为了阐明构效关系，使用各种技术对所有催化剂进行了表征。