Efficient and applicable catalysts are highly desirable for advanced biomass transformation industry,here,we fabricated a series of Nd-Co-P catalysts for hydrogenation of furfural(FAL)to furfuryl alcohol(FOH).By compr...Efficient and applicable catalysts are highly desirable for advanced biomass transformation industry,here,we fabricated a series of Nd-Co-P catalysts for hydrogenation of furfural(FAL)to furfuryl alcohol(FOH).By comprehensive characterizations,it is demonstrated that the prepared Nd-Co-P samples are structured as(NdPO_(4))_(m)/Co_(2)P nanocomposites with molar ratio(m)in range of 0.24-1.1;by manipulating m,the outstanding catalytic efficiency comparable with the performance of precious metal catalysts,such as turnover frequency(TOF)up to 0,50 s^(-1)(being ten-fold higher than Co_(2)P)and FOH yield up to97%,is achieved on the reusable(NdPO_(4))_(m)/Co_(2)P composites.Te mperature programmed desorption(TPD),in-situ infrared spectroscopy(IR)and kinetic-mechanism studies further disclose that Co_(2)P is decisive for activating FAL,instead,NdPO_(4)possesses unique capability of activating hydrogen which readily facilitate the selective hydrogenation of FAL to FOH through a rapid Langmuir-Hinshelwood process over(NdPO_(4))_(m)/Co_(2)P catalyst.These results indicate that rare-earth phosphates like NdPO_(4)can act as the promising and reliable catalytic component to activate hydrogen,which can be of interest not only for innovating novel and applicable non-metallic catalysts for sustainable biomass transformation analogous to hydrogenation of FAL,but also for expanding material base for other green mass transformation techniques involving hydrogen.展开更多
To exhibit large emission cross sections of Nd in silica glass, Nd surroundings were regulated in AI/P codoped silica glass prepared by our multi-step method. The influence of an equimolar amount of AI and P on spectr...To exhibit large emission cross sections of Nd in silica glass, Nd surroundings were regulated in AI/P codoped silica glass prepared by our multi-step method. The influence of an equimolar amount of AI and P on spectroscopic properties was studied under the local phosphorus coordination environment of Nd.The uniformity of composition distribution was characterized by energy dispersion spectra（EDS） and the coordination environment of Nd ions was characterized by the electron paramagnetic resonance（EPR）spectra. The results indicate that the composition distribution is of high uniformity and Nd has a stronger interaction with P atoms than AI atoms regardless of Al/P molar ratio. Local phosphorus coordination environment of Nd ions in silica glass is achieved. Large σ（em） can be achieved when Al or P is excessive,and larger σ（em） is more likely achieved when P is much more than Al. This work brings new possibilities for obtaining large stimulated cross sections of Nd in silica glass.展开更多
基金Project supported by the National Natural Science Foundation of China(21563018,21663016,22062014)。
文摘Efficient and applicable catalysts are highly desirable for advanced biomass transformation industry,here,we fabricated a series of Nd-Co-P catalysts for hydrogenation of furfural(FAL)to furfuryl alcohol(FOH).By comprehensive characterizations,it is demonstrated that the prepared Nd-Co-P samples are structured as(NdPO_(4))_(m)/Co_(2)P nanocomposites with molar ratio(m)in range of 0.24-1.1;by manipulating m,the outstanding catalytic efficiency comparable with the performance of precious metal catalysts,such as turnover frequency(TOF)up to 0,50 s^(-1)(being ten-fold higher than Co_(2)P)and FOH yield up to97%,is achieved on the reusable(NdPO_(4))_(m)/Co_(2)P composites.Te mperature programmed desorption(TPD),in-situ infrared spectroscopy(IR)and kinetic-mechanism studies further disclose that Co_(2)P is decisive for activating FAL,instead,NdPO_(4)possesses unique capability of activating hydrogen which readily facilitate the selective hydrogenation of FAL to FOH through a rapid Langmuir-Hinshelwood process over(NdPO_(4))_(m)/Co_(2)P catalyst.These results indicate that rare-earth phosphates like NdPO_(4)can act as the promising and reliable catalytic component to activate hydrogen,which can be of interest not only for innovating novel and applicable non-metallic catalysts for sustainable biomass transformation analogous to hydrogenation of FAL,but also for expanding material base for other green mass transformation techniques involving hydrogen.
基金Project supported by the National Natural Science Foundation of China(61505232,61775224)Youth Innovation Promotion Association of the Chinese Academy of Sciences and National High Technology Research and Development Program of China(2016YFB0402201)
文摘To exhibit large emission cross sections of Nd in silica glass, Nd surroundings were regulated in AI/P codoped silica glass prepared by our multi-step method. The influence of an equimolar amount of AI and P on spectroscopic properties was studied under the local phosphorus coordination environment of Nd.The uniformity of composition distribution was characterized by energy dispersion spectra（EDS） and the coordination environment of Nd ions was characterized by the electron paramagnetic resonance（EPR）spectra. The results indicate that the composition distribution is of high uniformity and Nd has a stronger interaction with P atoms than AI atoms regardless of Al/P molar ratio. Local phosphorus coordination environment of Nd ions in silica glass is achieved. Large σ（em） can be achieved when Al or P is excessive,and larger σ（em） is more likely achieved when P is much more than Al. This work brings new possibilities for obtaining large stimulated cross sections of Nd in silica glass.
