Abstract
Rice straw is an abundant material with the potential to be converted into a sustainable energy resource. Transition-metal catalysis activated the C–O bond in the hemicellulose of raw rice straw, cleaving it to form monosaccharides. The mechanism of rice straw catalytic conversion had a synergistic effect due to in situ acid catalysis and metal catalysis. The conditions for the hydrogenation of hemicellulose from rice straw were optimized: catalyst to rice straw solid/solid ratio of 3:10, stirring speed of 600 r/min, temperature of 160 °C, time of 3 h, solid/liquid ratio of 1:15, and H2 gas pressure of 1.5 MPa. An excellent hemicellulose conversion of 97.3% with the yields of xylose and arabinose at 53.0% and 17.3%, respectively, were obtained. The results from FTIR and SEM experiments also confirmed the destruction of the rigidity and reticulate structure of rice straw after the catalytic reaction.
Highlights
With the development of industry and society, the contradiction between the demand for resources and the shortage of non-renewable fossil resources has intensified [1,2]
We exhibit the results of our investigation of copper oxide (CuO)-catalyzed hydrogenation of rice straw leading to hemicellulose conversion
Factors Affecting Hemicellulose Conversion Catalyzed by CuO from Rice Straw
Summary
With the development of industry and society, the contradiction between the demand for resources and the shortage of non-renewable fossil resources has intensified [1,2]. Overutilization of fossil resources has led to severe environmental issues, such as the greenhouse effect and haze [3]. To avert these contradictions, researchers have developed alternatives to replace exhausted fossil resources. Rice straw (RS) is an abandoned agricultural waste with around 200 million tons produced in China annually. It is a popular lignocellulosic biomass resource and is renewable, programmable, and inedible with a large yield [6]. Recent studies reported the conversion of rice straw into valuable chemicals, especially biomaterials and biofuels; these efforts have attracted interest in recent times [7,8]
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