葡萄糖碳基固体酸催化水解醋酸甲酯

Hydrolysis of methyl acetate catalyzed by glucose derived carbon-based solid acid

以D-葡萄糖为原料制备一种碳基固体酸催化剂,采用X线衍射(XRD)、红外光谱(FT-IR)和酸密度测定等手段对催化剂进行表征,并以醋酸甲酯水解为探针反应,考察碳化和磺化温度对催化剂活性的影响。结果表明:碳基固体酸催化剂是由连接有磺酸基(—SO3H)的芳香碳片组成的无定形碳;当碳化温度为450℃、磺化温度为90℃时,制备的酸密度为1.4 mmol/g的催化剂具有较高的催化活性。与分子筛HZSM-5和强酸性阳离子交换树脂Amberlyst-15相比,碳基固体酸催化剂具有更高的转化频率。催化剂重复使用8次后,醋酸甲酯水解率稳定在10.5%左右,表明催化剂具有较好的稳定性。

A carbon-based solid acid catalyst was prepared from D-glucose.The performances of the catalysts were characterized by X-ray diffraction（XRD）,Fourier transform infrared spectroscopy（FT-IR） and acid density tests.The effect of carbonization and sulfonation temperature on catalytic activity was investigated using methyl acetate hydrolysis as a probe reaction.Results showed that the catalyst was an amorphous carbon composed of aromatic carbon sheets with —SO3H groups.The catalyst had high —SO3H density（1.4 mmol/g） and catalytic activity when the carbonization and sulfonation temperatures were 450 ℃ and 90 ℃.Compared with HZSM-5 and Amberlyst-15,the catalyst had the higher transformation frequency.The conversion of methyl acetate remained about 10.5% after the catalyst was reused for 8 times,indicating that the catalyst had good reusability.