Reaction of menthol and phenol in the presence of aluminium alkoxides
作者:I. Yu. Chukicheva、I. V. Fedorova、A. A. Koroleva、A. V. Kuchin
DOI:10.1007/s10600-008-9085-0
日期:2008.7
Phenol was alkylated with menthol in the presence of organoaluminium catalysts such as aluminium phenoxide and aluminium isopropoxide. Reaction products were isolated and characterized. Certain features of the process were determined.
For the first time, the oxidative dehydrogenation of (−)‐menthol to (−)‐menthone and (+)‐isomenthone in a marketable quality was carried out in a continuous gasphase reactor as a sustainable process using molecular oxygen as green oxidant and solid catalysts which do not contaminate the product mixture and which are easily to remove. The diastereomeric purity remained largely unchanged. Three types
首次在连续气相反应器中以可销售的质量将(-)-薄荷醇氧化脱氢为(-)-薄荷酮和(+)-异薄荷酮,这是一种可持续的工艺,使用分子氧作为绿色氧化剂,不会污染产品混合物且易于去除的固体催化剂。非对映异构体纯度基本保持不变。发现三种类型的催化剂在薄荷酮和异薄荷酮的形成中具有很高的活性和选择性:AgSr / SiO 2,分布在碱性载体上的CuO和RuMnCe / CeO 2。,其中Ru,Mn和Ce以氧化态存在。用银基催化剂获得的薄荷/异薄荷酮的最佳总收率为在64%选择性下为58%,在铜基催化剂上为51%的选择性为41%,在钌基催化剂上为73%的选择性为68%。反应条件被广泛优化。
Preparation of Hβ zeolites with hierarchical pores and a study on the isomerization performance of α-pinene
mesopores increased and the amount of acid slightly decreased. The catalyst after alkali treatment was applied to the isomerization reaction of α-pinene. The conversion of α-pinene increased to 96%, and the yield of camphene and limonene reached 67%. It was found that the isomerization reaction of α-pinene on the β zeolite followed the first-order reaction kinetics, and the activation energy of the reaction
用氢氧化钠溶液处理β沸石可以使β沸石部分脱硅,从而获得介孔结构。α-蒎烯的异构化已在 403 K 和大气压下进行了研究。通过XRD、SEM、BET分析、FT-IR光谱和Py-IR光谱对催化材料进行了表征。结果表明,氢氧化钠溶液可以有效调控β沸石的孔结构。β沸石的微孔结构被破坏。结晶度发生变化,中孔数量增加,酸量略有减少。将碱处理后的催化剂应用于α-蒎烯的异构化反应。α-蒎烯转化率提高到96%,莰烯和柠檬烯收率达到67%。−1。