Guo Wenwen, Li Guoneng, Zheng Youqu, Li Ke
Department of Energy and Environment System Engineering, Zhejiang University of Science and Technology Hangzhou 310023 China
College of Mechanical Engineering, Quzhou University Quzhou 324000 China.
RSC Adv. 2021 Oct 28;11(55):34915-34922. doi: 10.1039/d1ra05255a. eCollection 2021 Oct 25.
Nano-silica extracted from rice husk and its application in acetic acid steam reforming was studied in the paper. A simple and efficient heat treatment method was used to extract high specific surface area silica from rice husk. It was found that the acid leaching process was beneficial for the removal of metal impurities and the decomposition of organic substances. The carbon residue decreased and sample purity increased with increasing temperature. At 600 °C, silica with the yield of 21.7% and the purity of 99.45% was obtained. The specific surface area was as high as 335 m g, and the corresponding average pore diameter was 4.95 nm. Nano-silica extracted from rice husk was applied as a support in the preparation of an acetic acid steam reforming catalyst (Ni/RH-SiO). Ni/RH-SiO showed a better performance than Ni/SiO, which may be due to the higher interaction between Ni and SiO in Ni/RH-SiO. When the reforming temperature was 700 °C, carbon conversion of 95.3% and H yield of 2.38 mol mol were obtained. Carbon deposition was found after a 6 h test, mainly in the form of filamentous carbon. The carbon deposition amount of spent-Ni/RH-SiO was lower than that of spent-Ni/SiO.
本文研究了从稻壳中提取纳米二氧化硅及其在乙酸蒸汽重整中的应用。采用一种简单高效的热处理方法从稻壳中提取高比表面积二氧化硅。研究发现，酸浸过程有利于去除金属杂质和分解有机物。随着温度升高，碳残留量降低，样品纯度提高。在600℃时，获得了产率为21.7%、纯度为99.45%的二氧化硅。其比表面积高达335 m²/g，相应的平均孔径为4.95 nm。从稻壳中提取的纳米二氧化硅用作制备乙酸蒸汽重整催化剂（Ni/RH-SiO₂）的载体。Ni/RH-SiO₂表现出比Ni/SiO₂更好的性能，这可能是由于Ni/RH-SiO₂中Ni与SiO₂之间的相互作用更强。当重整温度为700℃时，碳转化率为95.3%，H₂产率为2.38 mol/mol。在6小时测试后发现有积碳现象，主要以丝状碳的形式存在。失活后的Ni/RH-SiO₂的积碳量低于失活后的Ni/SiO₂。
