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Efficient production of biodiesel from both esterification and transesterification over supported SO2-_4–MoO_3–ZrO_2–Nd_2O_3/SiO_2 catalysts 认领 引用 被引量:7
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作者 Xiuqin Li Dongmei Tong Changwei Hu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2015年第4期463-471,共9页
SO2-4–Mo O3–Zr O2–Nd2O3/Si O2(SMZN/Si O2) catalysts for the production of biodiesel via both esterification and transesterification were prepared and characterized by N2adsorption-desorption isotherms,X-ray diffr... SO2-4–Mo O3–Zr O2–Nd2O3/Si O2(SMZN/Si O2) catalysts for the production of biodiesel via both esterification and transesterification were prepared and characterized by N2adsorption-desorption isotherms,X-ray diffraction(XRD),scanning electron microscopy(SEM),thermogravimetry analysis(TGA),ammonia adsorption Fourier transform infrared spectra(NH3-FTIR),and ammonia adsorption temperature programmed desorption(NH3-TPD) to reveal the dependence of the stable catalytic activity on calcination time. The reason for catalyst deactivation was also studied. The calcination time remarkably affected the types of active centers on SMZN/Si O2-2,and 4 h was found to be the optimal calcination time. SO4 species bonded with small size Zr O2 were found to be the stable active centers,where the leaching of SO2-4and the deposition of coke were inhibited. The deposition of coke was easier on large size Zr O2 than on small size ones. Calcination in air flow could eliminate the deposited coke to recover the deactivated catalysts. 展开更多
关键词 Biodiesel SMZN/SiO2solid acids Stable active centers Small size ZrO2
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固体酸S_2O_82-/Fe_2O_3-SiO_2催化制备马来酸二己酯 认领 引用 被引量:1
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作者 华平 沙兆林 《应用化工》 CAS 2002年第6期3-8,共6页
在铁氧化物中引入硅的氧化物 ,并用S2 O82 -浸渍铁硅复合氧化物 ,制得固体酸催化剂S2 O82 -/Fe2 O3 SiO2 (Ⅰ )。用马来酸酐与正己醇的酯化反应考察了催化剂的活性。通过XRD和TEM分析 ,对催化剂的结构进行了表征。结果表明 ,Ⅰ的最佳制... 在铁氧化物中引入硅的氧化物 ,并用S2 O82 -浸渍铁硅复合氧化物 ,制得固体酸催化剂S2 O82 -/Fe2 O3 SiO2 (Ⅰ )。用马来酸酐与正己醇的酯化反应考察了催化剂的活性。通过XRD和TEM分析 ,对催化剂的结构进行了表征。结果表明 ,Ⅰ的最佳制备条件为 :n(Fe)∶n(Si)为 5∶1、70℃陈化 3h ,2 0 0℃焙烧 2h、用 0 2 5mol/L的 (NH4) 2 S2 O8浸渍 3h、在 5 5 0℃下煅烧 6h ;Ⅰ的催化活性比S2 O2 -8/Fe2 O3 和SO2 -4/Fe2 O3 SiO2 更强 ,S2 O2 -8对Fe2 O3 SiO2 的促进作用明显高于SO2 -4;SiO2 的引入提高了催化剂的分散效果 ;有较好的使用重复性 ;它代替硫酸。 展开更多
关键词 S2O8^2-/Fe2O3-SiO2 固体酸催化剂 马来酸二己酯 酯化反应
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