The rapid advances in biodiesel technologies in recent years and the generation of huge amounts of glycerol as a by-product have led to a glycerol glut in the market and a significant drop in its price. The development of suitable techniques for glycerol valorization has recently attracted considerable attention and the photocatalytic process emerged as a forefront technology that integrates solar energy with glycerol conversion at ambient temperature and atmospheric pressure. The present review focusses on the analysis of this photocatalytic process to address the challenges and opportunities for its implementation. In this regard, the mechanisms of glycerol photoreforming and photo-oxidation as well as their gaseous (like hydrogen) and value-added liquid products are first analyzed. The developed kinetic and empirical models are then discussed to evaluate the prospects in the analysis of this process through a modeling approach. Finally, a thorough critical assessment is performed on the research related to synthesis parameters like cocatalyst percentage and calcination conditions, as well as the most critical operating parameters such as the hydrogen source, reaction time, glycerol concentration, solution pH, photocatalyst loading, photocatalyst stability, source and intensity of light, and reaction temperature.

中文翻译：

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光催化甘油增值的当前发展和未来趋势：过程分析

近年来，生物柴油技术的飞速发展以及作为副产物的大量甘油的产生导致市场上的甘油过剩，其价格大幅度下降。合适的甘油增价技术的发展近来引起了相当大的关注，并且光催化工艺作为将太阳能与在环境温度和大气压下的甘油转化相结合的最前沿技术而出现。本综述着重于对该光催化过程的分析，以解决其实施所面临的挑战和机遇。在这方面，首先分析了甘油光重整和光氧化的机理，以及它们的气态（如氢）和增值液体产品。然后讨论开发的动力学和经验模型，以通过建模方法评估此过程的分析前景。最后，对有关合成参数（如助催化剂百分比和煅烧条件）以及最关键的操作参数（例如氢源，反应时间，甘油浓度，溶液pH值，光催化剂负载量，光催化剂稳定性）的研究进行了全面的关键评估。 ，光的来源和强度以及反应温度。