The emerging food additive, xylo-oligosaccharide(XOSs), was prepared through enzymatic hydrolysis of hemicelluloses isolated from press lye. Two of the three experimental enzyme preparations presented favourable effec...The emerging food additive, xylo-oligosaccharide(XOSs), was prepared through enzymatic hydrolysis of hemicelluloses isolated from press lye. Two of the three experimental enzyme preparations presented favourable effects, while the other one consisting of the nominal enzyme preparations with high enzyme activity was found to have poor catalytic effects. The conversion of xylan exceeded 40% and the selectivity for XOSs reached 90% when the temperature, hemicellulose concentration, dosage of enzymes, and hydrolysis time were 40?C, 100 g/L, 1 ku/g, and 4 h, respectively. Xylo-oligosaccharide preparation through enzymatic hydrolysis of hemicelluloses isolated from press lye was proved to be a feasible process to utilize the by-product of the lye regeneration, which will substantially improve the economy of the lye regeneration and recycling.展开更多
随着全球对绿色氢能需求的不断攀升,碱性电解水制氢技术凭借其成熟性与低成本优势,成为大规模生产绿氢的主流方式.然而,在低电流密度运行工况下,碱性电解槽中的氧中氢(Hydrogen to oxygen,HTO)问题成为制约其安全性与效率提升的关键挑战...随着全球对绿色氢能需求的不断攀升,碱性电解水制氢技术凭借其成熟性与低成本优势,成为大规模生产绿氢的主流方式.然而,在低电流密度运行工况下,碱性电解槽中的氧中氢(Hydrogen to oxygen,HTO)问题成为制约其安全性与效率提升的关键挑战.本文综述了碱性电解槽中HTO的形成机理、影响因素及其控制方法.综述了HTO控制方法中隔膜材料、催化剂、电解槽结构、系统参数控制和碱液分离循环等方面的研究进展,系统总结了当前控制HTO的主要策略.研究表明,碱液分离循环是控制HTO最为直接有效的方法,而新型隔膜材料的研发和系统参数的优化在降低氢气渗透方面也展现出显著成效.未来研究应持续探索高效、低成本且可工程化的HTO控制策略,以进一步提升碱性电解槽在可再生能源制氢领域的应用潜力,推动氢能产业的可持续发展.展开更多
基金Supported by Science and Education Integration Program of Henan University of Technology
文摘The emerging food additive, xylo-oligosaccharide(XOSs), was prepared through enzymatic hydrolysis of hemicelluloses isolated from press lye. Two of the three experimental enzyme preparations presented favourable effects, while the other one consisting of the nominal enzyme preparations with high enzyme activity was found to have poor catalytic effects. The conversion of xylan exceeded 40% and the selectivity for XOSs reached 90% when the temperature, hemicellulose concentration, dosage of enzymes, and hydrolysis time were 40?C, 100 g/L, 1 ku/g, and 4 h, respectively. Xylo-oligosaccharide preparation through enzymatic hydrolysis of hemicelluloses isolated from press lye was proved to be a feasible process to utilize the by-product of the lye regeneration, which will substantially improve the economy of the lye regeneration and recycling.
文摘随着全球对绿色氢能需求的不断攀升,碱性电解水制氢技术凭借其成熟性与低成本优势,成为大规模生产绿氢的主流方式.然而,在低电流密度运行工况下,碱性电解槽中的氧中氢(Hydrogen to oxygen,HTO)问题成为制约其安全性与效率提升的关键挑战.本文综述了碱性电解槽中HTO的形成机理、影响因素及其控制方法.综述了HTO控制方法中隔膜材料、催化剂、电解槽结构、系统参数控制和碱液分离循环等方面的研究进展,系统总结了当前控制HTO的主要策略.研究表明,碱液分离循环是控制HTO最为直接有效的方法,而新型隔膜材料的研发和系统参数的优化在降低氢气渗透方面也展现出显著成效.未来研究应持续探索高效、低成本且可工程化的HTO控制策略,以进一步提升碱性电解槽在可再生能源制氢领域的应用潜力,推动氢能产业的可持续发展.
