Catalytic degradation of cellulose to chemicals is an attracting topic today for the conver- sion of biomass, and the development of novel catalysts is a key point. Since metal-organic frameworks （MOFs） possess unif...Catalytic degradation of cellulose to chemicals is an attracting topic today for the conver- sion of biomass, and the development of novel catalysts is a key point. Since metal-organic frameworks （MOFs） possess uniform, continuous, and permeable channels, they are valu- able candidate as catalysts. Here, a new 3D MOF/graphene catalyst was prepared by in situ growth of the zeolitic imidazolate frameworks （ZIF-8） nanoparticles inside the pore of an as-formed 3D reduced graphene oxide （rGO） hydrogel. The ZIF-8/rGO nanocomposite owns both micropores and mesopores with large specific surface area and plenty of acids sites, which is an idea catalyst for biomass degradation. Cellulose was dissolved in allmline aqueous solution at first, and then it was degraded efficiently over the new catalyst under hydrothermal condition. The conversion reaches 100% while the main products are formic acid with a maximum yield of 93.66%. In addition, the catalyst can be reused with high activity.展开更多
2022年7月12日,北京大学药学院天然药物及仿生药物国家重点实验室马明研究团队在国际著名期刊Angew.Chem.Int.Ed.上发表了题为“Crystal structure based mutagenesis of cattleyene synthase leads to the generation of rearranged po...2022年7月12日,北京大学药学院天然药物及仿生药物国家重点实验室马明研究团队在国际著名期刊Angew.Chem.Int.Ed.上发表了题为“Crystal structure based mutagenesis of cattleyene synthase leads to the generation of rearranged polycyclic diterpenes”的研究论文。该研究通过解析二萜环化酶晶体结构揭示复杂四环二萜cattleyene生物合成机制,并基于晶体结构开展定点突变改变酶的产物结构,获得新骨架二萜化合物。展开更多
文摘Catalytic degradation of cellulose to chemicals is an attracting topic today for the conver- sion of biomass, and the development of novel catalysts is a key point. Since metal-organic frameworks （MOFs） possess uniform, continuous, and permeable channels, they are valu- able candidate as catalysts. Here, a new 3D MOF/graphene catalyst was prepared by in situ growth of the zeolitic imidazolate frameworks （ZIF-8） nanoparticles inside the pore of an as-formed 3D reduced graphene oxide （rGO） hydrogel. The ZIF-8/rGO nanocomposite owns both micropores and mesopores with large specific surface area and plenty of acids sites, which is an idea catalyst for biomass degradation. Cellulose was dissolved in allmline aqueous solution at first, and then it was degraded efficiently over the new catalyst under hydrothermal condition. The conversion reaches 100% while the main products are formic acid with a maximum yield of 93.66%. In addition, the catalyst can be reused with high activity.
文摘2022年7月12日,北京大学药学院天然药物及仿生药物国家重点实验室马明研究团队在国际著名期刊Angew.Chem.Int.Ed.上发表了题为“Crystal structure based mutagenesis of cattleyene synthase leads to the generation of rearranged polycyclic diterpenes”的研究论文。该研究通过解析二萜环化酶晶体结构揭示复杂四环二萜cattleyene生物合成机制,并基于晶体结构开展定点突变改变酶的产物结构,获得新骨架二萜化合物。
