Microwave-assisted valorization of glycerol to solketal using biomass-derived heterogeneous catalyst
Microwave-assisted valorization of glycerol to solketal using biomass-derived heterogeneous catalyst
复制标题
使用生物质衍生的非均相催化剂将甘油微波辅助增值为缩酮醇
作者：
Ao S
随着全球生物柴油产量的增加，这一过程的副产品（甘油）的价值提高对经济可持续性至关重要。因此，高度期望将甘油转化为平台化学品，例如燃料添加剂（2，2-二甲基-1，3-二氧戊环-4-基）甲醇（丙酮缩酮）。在这项研究中，甘油转化为丙酮缩酮使用磺酸官能化的芳香族碳质材料（SAFACAM）轴承辅助亲水基团，并作为一个非均相催化剂在微波辐射下。对于通过缩醛化生产丙酮缩酮，记录的最佳甘油：丙酮摩尔比为1：5。使用8wt%的催化剂剂量在70 °C下在微波辐射（50 W，IOOpsi）下仅10分钟返回98.1 ± 0.4%的双甘甘油转化率和100%的丙酮缩酮选择性。缩醛化反应的活化能测定为35.8 kJ mol−1。在六个循环中探测催化剂回收率，如EDS数据所证实的，由于有限的活性位点浸出，活性有适度的损失（在第六个循环中转化率为82.3 ± 0.2%）。
The increase in biodiesel production worldwide makes valorisation of the by-product of this process (glycerol) essential for economic sustainability. Hence, conversion of bioglycerol to platform chemicals such as (2,2-dimethyl-1,3-dioxolan-4-yl)methanol (solketal), a fuel additive, is highly desirable. In this study, glycerol is converted to solketal using a sulfonic acid-functionalized aromatic carbonaceous material (SAFACAM) bearing ancillary hydrophilic groups and acting as a heterogeneous catalyst under microwave irradiation. For the production of solketal by acetalization, an optimal glycerol:acetone molar ratio of 1:5 was recorded. Using a catalyst dosage of 8 wt% at 70 °C for just 10 mins under microwave irradiation (50 W, 100 psi) returned a 98.1 ± 0.4 % conversion of bioglycerol with 100 % selectivity to solketal. The activation energy of the acetalization reaction was determined to be 35.8 kJ mol−1. Catalyst recovery was probed over six cycles, with a modest loss in activity (82.3 ± 0.2 % conversion in the sixth cycle) resulting from limited active site leaching, as confirmed by EDS data.