Abstract

The waste rice straw is a sustainable bioresource with large reserves and low-cost, thus can be used to produce fuels and chemicals to enhance its value. In this paper, we have developed a new method to convert rice straw into biogasoline with high yield in one step by using multifunctional catalyst of RhCl₃/NaI/HCl/H₂ in a biphasic reaction system. Lipid and lignin in the rice straw hindered its conversion and need to be removed by pretreatment. The major products are C5 and C6 furan, furfural, and cyclic ketones, which are low in oxygen content and can be used as biogasoline. Under the optimal reaction conditions (140 °C, 4 h, 300 psi H₂, toluene to water volume ration 1:1), C5 from hemicellulose with 77.2% yield and C6 from cellulose with 71.7% yield can be obtained. The total biogasoline yield based on dry rice straw is 23.5 wt%, which is quite significant. The mechanism of the conversion process was also well studied.

Graphical abstract

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抽象的

稻草秸秆是一种可持续的生物资源，储量大，成本低，可用于生产燃料和化学品，以提高其价值。在本文中，我们开发了一种在两相反应体系中使用RhCl ₃ / NaI / HCl / H ₂多功能催化剂一步一步将稻草转化为高产生物汽油的新方法。稻草中的脂质和木质素阻碍了其转化，需要通过预处理除去。主要产品是C5和C6呋喃，糠醛和环状酮，它们的氧含量低，可以用作生物汽油。在最佳反应条件下（140°C，4 h，300 psi H ₂，甲苯与水的体积比为1：1），半纤维素的C5收率为77.2％，纤维素的C6收率为71.7％。基于干稻草的总生物汽油产率为23.5 wt％，这是相当可观的。转化过程的机理也得到了很好的研究。

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