This paper analyses the fragmenting principle of static blasting agent (SBA) and the action of its cutting fragmentation. Using SBA for sterming material proved very useful and advantageous. Here we analyse in detail ...This paper analyses the fragmenting principle of static blasting agent (SBA) and the action of its cutting fragmentation. Using SBA for sterming material proved very useful and advantageous. Here we analyse in detail the cutting action of pre- stress and stress wave in pre-stressing force blasting.展开更多
Propane dehydrogenation(PDH)is an efficient technology for the direct production of propylene.Nevertheless,current PDH catalysts mainly rely on precious Pt or toxic Cr and especially undergo severe coke deposition.Her...Propane dehydrogenation(PDH)is an efficient technology for the direct production of propylene.Nevertheless,current PDH catalysts mainly rely on precious Pt or toxic Cr and especially undergo severe coke deposition.Herein,we report a Ru catalyst decorated by boron species(Ru-3B/Al_(2)O_(3)),which exhibits high catalytic performance for PDH.HAADF-STEM,EELS,and CO-FTIR characterization are used to identify the surface structure of the Ru active component,which shows that the high-energy unsaturated coordination sites,including corners,edges and step atoms for Ru-3B/Al_(2)O_(3),are appropriately modified by BO_(x)species.The encapsulation of high-energy active sites prone to Csingle bondC cracking and deep dehydrogenation leads to higher propylene selectivity(>95%)and strong carbon resistance(kd 0.0007 min)over Ru-3B/Al_(2)O_(3).The XPS and H2-TPR results show that the migration of B species is driven by the reduction of B_(2)O_(3)to B2O2 and that the coating degree of Ru particles is controlled by the chemical valance of Ru species.展开更多
文摘This paper analyses the fragmenting principle of static blasting agent (SBA) and the action of its cutting fragmentation. Using SBA for sterming material proved very useful and advantageous. Here we analyse in detail the cutting action of pre- stress and stress wave in pre-stressing force blasting.
基金supported by the National Natural Science Foundations of China(22078007)the Fundamental Research Funds for the Central Universities(JD2108)Innovative Achievement Commercialization Service-Platform of Industrial Catalysis,MIIT.R.M.would like to thank Chemistry and Chemical Engineering Guangdong Laborary for startup funding support(2111001).
文摘Propane dehydrogenation(PDH)is an efficient technology for the direct production of propylene.Nevertheless,current PDH catalysts mainly rely on precious Pt or toxic Cr and especially undergo severe coke deposition.Herein,we report a Ru catalyst decorated by boron species(Ru-3B/Al_(2)O_(3)),which exhibits high catalytic performance for PDH.HAADF-STEM,EELS,and CO-FTIR characterization are used to identify the surface structure of the Ru active component,which shows that the high-energy unsaturated coordination sites,including corners,edges and step atoms for Ru-3B/Al_(2)O_(3),are appropriately modified by BO_(x)species.The encapsulation of high-energy active sites prone to Csingle bondC cracking and deep dehydrogenation leads to higher propylene selectivity(>95%)and strong carbon resistance(kd 0.0007 min)over Ru-3B/Al_(2)O_(3).The XPS and H2-TPR results show that the migration of B species is driven by the reduction of B_(2)O_(3)to B2O2 and that the coating degree of Ru particles is controlled by the chemical valance of Ru species.
