XPS and chemical trapping experments with H2, NH3, and CH3I as trapping agents were carried out for studying the adsorption of propylene over MoO3 or r-Bi2MoO6. The results show that the fragmentation of carbon chain ...XPS and chemical trapping experments with H2, NH3, and CH3I as trapping agents were carried out for studying the adsorption of propylene over MoO3 or r-Bi2MoO6. The results show that the fragmentation of carbon chain takes place during the adsorption of propylene through breaking C -C double bond and C-C bond on Mo2+ and the adjacent lattice oxygen, leading to formation of the oxygen- or nitrogen-containing by-products of C1 and C2 species. Diffuse-Reflection Fourier Transform Infrared (DRFTIR) Spectroscopy was used to study the surface species formed during the chemisorption and reaction of propylene over y-Bi2MoO6 at a lower temperature. The results that C1, C2 adspecies were detected by DRFTIR at 175℃ are consistent with the results of XPS and chemical trapping experiments, whlle the results at 50℃ Grasselli et al.展开更多
An electrocatalytic NO_(2)^(−)reduction reaction(NO_(2)^(−)RR)has cast new light on renewable NH_(3)synthesis and treatment of NO_(2)^(−)-contaminated aquatic ecosystems.Numerous studies have been devoted to develop-i...An electrocatalytic NO_(2)^(−)reduction reaction(NO_(2)^(−)RR)has cast new light on renewable NH_(3)synthesis and treatment of NO_(2)^(−)-contaminated aquatic ecosystems.Numerous studies have been devoted to develop-ing NO_(2)^(−)RR electrocatalysts with superior selectivity.However,few efforts have focused on constructing bifunctional catalysts promoting the NO_(2)^(−)RR and the oxygen evolution reaction(OER)simultaneously,which is significant to reduce the energy consumption and cost of electrocatalytic ammonia production.Herein,we demonstrate the core-shell heterostructures of NiFe LDH nanoarrays attached to Co_(3)O_(4)nanosheets on Ni foam,which exhibit an excellent NO_(2)^(−)RR performance(yield:4.27 mg h^(−1)cm^(−2),FE:96.53%at−0.5 V)and a remarkable OER performance(η100:270 mV)as well as decent stability.Furthermore,a two-electrode electrolyzer assembled with Co_(3)O_(4)/NiFe LDH heterostructures only requires 1.55 V to reach 10 mA cm^(−2),approaching that of the ammonia production system assembled with a noble-metal-based catalyst.The decent NO_(2)^(−)RR and OER properties benefit from the optimized electronic structure due to the heterojunction formation and the increased electrochemically active area owing to the core-shell structure construction.This effort offers new insights into achieving high-efficiency and low-cost electrocatalytic ammonia production.展开更多
Wengfu Group announced to start constructionon its 600 000 t/a diammonia phosphate/monoammonium phosphate (DAP/MAP) plant with a ceremony held at itsDazhou Phosphorus and Sulfur ChemicalBase in Sichuan province on Apr...Wengfu Group announced to start constructionon its 600 000 t/a diammonia phosphate/monoammonium phosphate (DAP/MAP) plant with a ceremony held at itsDazhou Phosphorus and Sulfur ChemicalBase in Sichuan province on April 30th.EastChina Engineering Science and展开更多
为应对大规模多输入多输出(Multiple⁃input multiple⁃output,MIMO)系统中信道状态信息(Channel state information,CSI)反馈开销的日益增长,基于深度学习的CSI反馈网络(如Transformer网络)受到了广泛的关注,是一种非常有应用前景的智能...为应对大规模多输入多输出(Multiple⁃input multiple⁃output,MIMO)系统中信道状态信息(Channel state information,CSI)反馈开销的日益增长,基于深度学习的CSI反馈网络(如Transformer网络)受到了广泛的关注,是一种非常有应用前景的智能传输技术。为此,本文提出了一种基于数据聚类的CSI反馈Transformer网络的简化方法,采用基于聚类的近似矩阵乘法(Approximate matrix multiplication,AMM)技术,以降低反馈过程中Transformer网络的计算复杂度。本文主要对Transformer网络的全连接层计算(等效为矩阵乘法),应用乘积量化(Product quantization,PQ)和MADDNESS等简化方法,分析了它们对计算复杂度和系统性能的影响,并针对神经网络数据的特点进行了算法优化。仿真结果表明,在适当的参数调整下,基于MADDNESS方法的CSI反馈网络性能接近精确矩阵乘法方法,同时可大幅降低计算复杂度。展开更多
基金Supported by the National Natural Science Fundation of China.
文摘XPS and chemical trapping experments with H2, NH3, and CH3I as trapping agents were carried out for studying the adsorption of propylene over MoO3 or r-Bi2MoO6. The results show that the fragmentation of carbon chain takes place during the adsorption of propylene through breaking C -C double bond and C-C bond on Mo2+ and the adjacent lattice oxygen, leading to formation of the oxygen- or nitrogen-containing by-products of C1 and C2 species. Diffuse-Reflection Fourier Transform Infrared (DRFTIR) Spectroscopy was used to study the surface species formed during the chemisorption and reaction of propylene over y-Bi2MoO6 at a lower temperature. The results that C1, C2 adspecies were detected by DRFTIR at 175℃ are consistent with the results of XPS and chemical trapping experiments, whlle the results at 50℃ Grasselli et al.
基金supported by the National Natural Science Foundation of China(Grant No.22179065).
文摘An electrocatalytic NO_(2)^(−)reduction reaction(NO_(2)^(−)RR)has cast new light on renewable NH_(3)synthesis and treatment of NO_(2)^(−)-contaminated aquatic ecosystems.Numerous studies have been devoted to develop-ing NO_(2)^(−)RR electrocatalysts with superior selectivity.However,few efforts have focused on constructing bifunctional catalysts promoting the NO_(2)^(−)RR and the oxygen evolution reaction(OER)simultaneously,which is significant to reduce the energy consumption and cost of electrocatalytic ammonia production.Herein,we demonstrate the core-shell heterostructures of NiFe LDH nanoarrays attached to Co_(3)O_(4)nanosheets on Ni foam,which exhibit an excellent NO_(2)^(−)RR performance(yield:4.27 mg h^(−1)cm^(−2),FE:96.53%at−0.5 V)and a remarkable OER performance(η100:270 mV)as well as decent stability.Furthermore,a two-electrode electrolyzer assembled with Co_(3)O_(4)/NiFe LDH heterostructures only requires 1.55 V to reach 10 mA cm^(−2),approaching that of the ammonia production system assembled with a noble-metal-based catalyst.The decent NO_(2)^(−)RR and OER properties benefit from the optimized electronic structure due to the heterojunction formation and the increased electrochemically active area owing to the core-shell structure construction.This effort offers new insights into achieving high-efficiency and low-cost electrocatalytic ammonia production.
文摘Wengfu Group announced to start constructionon its 600 000 t/a diammonia phosphate/monoammonium phosphate (DAP/MAP) plant with a ceremony held at itsDazhou Phosphorus and Sulfur ChemicalBase in Sichuan province on April 30th.EastChina Engineering Science and
