Modified boehmite: a choice of catalyst for the selective conversion of glycerol to five-membered dioxolane
作者:Manas Barik、Jyotiranjan Mishra、Shilpa Dabas、Eswaran Chinnaraja、Saravanan Subramanian、Palani S. Subramanian
DOI:10.1039/d1nj04860k
日期:——
The catalytic activity of WO3@boehmite for the acetalization of glycerol with aromatic aldehydes is described in this article. The catalyst is selective towards dioxolane (up to 96%) with excellent conversion (up to 100%) in selective substrates.
Clay catalysed rapid valorization of glycerol towards cyclic acetals and ketals
作者:Radheshyam R. Pawar、Kalpeshgiri A. Gosai、Adarsh S. Bhatt、S. Kumaresan、Seung Mok Lee、Hari C. Bajaj
DOI:10.1039/c5ra15817f
日期:——
Biodiesel production usually results in a huge amount of glycerol, raising a critical need to transform it into high value products. The present study highlights that solvent-free, conventional thermal activation, and non-conventional microwave/ultrasonic activation in the liquid phase are able to selectively transform glycerol into cyclicacetals and ketals using an optimised acid activated clay catalyst
生物柴油的生产通常会产生大量的甘油,因此迫切需要将其转化为高价值的产品。本研究强调,无溶剂,常规的热活化和液相中的非常规微波/超声波活化能够使用优化的酸活化粘土催化剂将甘油选择性地转化为环状缩醛和缩酮。在温和的反应条件下,以高浓度的粘土(6%)和在6至15 N范围内变化的酸浓度,优化了膨润土的酸活化参数。 FT-IR,BET和XRF分析。通过体积滴定法检查催化剂的活性位点,并通过吡啶吸附的FT-IR和先进的NH进行确认3- TPD分析。活化在相对温和的条件下进行,即;6 NH 2 SO 4和6%w / v粘土可再现地导致表面积(180 m 2 g -1)和表面酸度(23 mg KOH g -1)的改善,并具有定量的布朗斯台德和路易斯酸性位置。此外,除呋喃基燃料添加剂前体在甘油中具有高转化率和优异的选择性外,在活化度低得多的情况下,成功地利用了涉及催化剂,微波或超声处理的环保工艺来获得具有商业价值的风信子香精。时间(2分钟)。
Microwave rehydrated Mg–Al-LDH as base catalyst for the acetalization of glycerol
作者:H. R. Prakruthi、B. M. Chandrashekara、B. S. Jai Prakash、Y. S. Bhat
DOI:10.1039/c5cy00347d
日期:——
Acetalization of glycerol with aldehydes to form cyclic acetals is an industrially important reaction and is generally carried out using acid catalysts.
Room temperature acetalization of glycerol to cyclic acetals over anchored silicotungstates under solvent free conditions
作者:Nilesh Narkhede、Anjali Patel
DOI:10.1039/c4ra01851f
日期:——
silicotungstate as well as monolacunary silicotungstate anchored to MCM-41 were synthesized and characterized by several physicochemical methods. A solvent free green route towards valorisation of glycerol via acetalization with benzaldehyde has been proposed. Both the catalysts showed very good activity as well as selectivity towards dioxolane derivatives within a short reaction time and at room temperature