为了提高碱催化酯交换工艺中粗生物柴油的精制效果,研究提出了膨润土吸附精制粗生物柴油的优化工艺。实验考察了膨润土用量、吸附温度和吸附时间对游离甘油和总甘油脱除效果的影响,测定了膨润土吸附游离甘油、单甘酯及二甘酯过程的动力...为了提高碱催化酯交换工艺中粗生物柴油的精制效果,研究提出了膨润土吸附精制粗生物柴油的优化工艺。实验考察了膨润土用量、吸附温度和吸附时间对游离甘油和总甘油脱除效果的影响,测定了膨润土吸附游离甘油、单甘酯及二甘酯过程的动力学,并探讨了吸附精制过程的机理。结果表明,在膨润土用量为粗生物柴油质量的4%、吸附温度为60℃、吸附时间为40 min条件下,精制得到的生物柴油质量达到欧洲标准(EN 14214)要求,收率达到97.6%,效果明显优于传统的水洗精制法;膨润土吸附游离甘油、单甘酯及二甘酯过程动力学均符合拟二级动力学方程,其吸附活化能分别为27.1、28.2和31.8 k J·mol-1,为物理吸附;膨润土的吸附动力是其亲水性,亲水性强及分子小的游离甘油和皂先吸附,而亲水性较弱、分子较大的单甘酯及二甘酯后吸附,吸附剂分两批加入对精制过程有利。展开更多
Heterojunction catalysts composed of transition metal sulfides exhibited excellent potentials in electrocatalytic water splitting.Herein,we have designed a FeS/Co_(3)S_(4) heterojunction catalyst for hydrogen evolutio...Heterojunction catalysts composed of transition metal sulfides exhibited excellent potentials in electrocatalytic water splitting.Herein,we have designed a FeS/Co_(3)S_(4) heterojunction catalyst for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)in alkaline water/seawater solution.Three-dimensional nanoarrays were grown on nickel foam,and the successful synthesis of heterojunction endowed excellent activity to the catalyst.In alkaline water/seawater solution,the low overpotentials(at current density of 10 mA/cm^(2))of HER were 120.3 and 135.6 mV and the low overpotentials of OER were 212 and 232 mV,respectively.This work provided an effective method for highly-efficiently electrocatalytic splitting of water via fabrication of heterojunction.展开更多
文摘为了提高碱催化酯交换工艺中粗生物柴油的精制效果,研究提出了膨润土吸附精制粗生物柴油的优化工艺。实验考察了膨润土用量、吸附温度和吸附时间对游离甘油和总甘油脱除效果的影响,测定了膨润土吸附游离甘油、单甘酯及二甘酯过程的动力学,并探讨了吸附精制过程的机理。结果表明,在膨润土用量为粗生物柴油质量的4%、吸附温度为60℃、吸附时间为40 min条件下,精制得到的生物柴油质量达到欧洲标准(EN 14214)要求,收率达到97.6%,效果明显优于传统的水洗精制法;膨润土吸附游离甘油、单甘酯及二甘酯过程动力学均符合拟二级动力学方程,其吸附活化能分别为27.1、28.2和31.8 k J·mol-1,为物理吸附;膨润土的吸附动力是其亲水性,亲水性强及分子小的游离甘油和皂先吸附,而亲水性较弱、分子较大的单甘酯及二甘酯后吸附,吸附剂分两批加入对精制过程有利。
基金supported by the Dean/Opening Project of Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology(2023K001)Taishan Scholars Foundation of Shandong province(TSQN201909058).
文摘Heterojunction catalysts composed of transition metal sulfides exhibited excellent potentials in electrocatalytic water splitting.Herein,we have designed a FeS/Co_(3)S_(4) heterojunction catalyst for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)in alkaline water/seawater solution.Three-dimensional nanoarrays were grown on nickel foam,and the successful synthesis of heterojunction endowed excellent activity to the catalyst.In alkaline water/seawater solution,the low overpotentials(at current density of 10 mA/cm^(2))of HER were 120.3 and 135.6 mV and the low overpotentials of OER were 212 and 232 mV,respectively.This work provided an effective method for highly-efficiently electrocatalytic splitting of water via fabrication of heterojunction.
