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海泡石负载钴氧化物催化氧化解聚木质素磺酸钠 |
Effect of CoxO/m-Sep on Catalytic Oxidative Depolymerization of Sodium Lignosulfonate |
收稿日期:2022-04-08 |
DOI:DOI:10.11980/j.issn.0254-508X.2022.12.001 |
关键词: 木质素磺酸钠 催化氧化解聚 海泡石 催化剂 |
Key Words:sodium lignosulfonate catalytic oxidative depolymerization sepiolite catalysts |
基金项目:国家重点研发计划(2019YFE0114600;2019YFB1503801);湖南省自然科学基金青年项目(2021JJ41065);长沙市自然科学基金项目(kq2014148);中南林业科技大学引进人才科研启动基金项目(2019YJ029)。 |
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摘要:制备了改性海泡石负载钴基催化剂CoxO/m-Sep,用于催化氧化解聚木质素磺酸钠。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、比表面积与孔隙分析仪(BET)、傅里叶变换红外光谱仪(FT-IR)和X射线光电子能谱仪(XPS)对制备的催化剂进行表征,并研究了反应温度、反应时间、反应初始氧压对木质素磺酸钠催化氧化解聚效果的影响。结果表明,CoxO/m-Sep体系中,在反应温度200 ℃,反应时间4 h,反应初始氧压1.0 MPa的条件下,木质素磺酸钠转化率可达91.7%,乙酸乙酯(EA)可溶性产物收率最高为16.1%,其中含有苯酚、苯甲酸和丁二酸二乙酯等化学品。 |
Abstract:Modified sepiolite supported cobalt-based catalysts (CoxO/m-Sep) were prepared and used in the oxidative depolymerization of sodium lignosulfonate (SLS). The depolymerization performance of sodium lignosulfonate at reaction temperature, reaction time and initial oxygen pressure was investigated and the catalysts were characterized by scanning electron microscope (SEM), X-ray powder diffraction (XRD), specific surface area and porosity analyzer (BET), fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The results showed that the lignin conversion was 91.7% and the highest yield of ethyl acetate (EA) soluble products was 16.1% in the CoxO/m-Sep system at a reaction temperature of 200 ℃, a reaction time of 4 h and an initial reaction oxygen pressure of 1.0 MPa. The EA soluble products contained chemicals such as phenol, benzoic acid and diethyl succinate. |
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