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| 1 | Promoted effect of zinc–nickel bimetallic oxides supported on HZSM-5 catalysts in aromatization of methanol显示文摘Zn/ZSM-5(NZ2) and Zn/Ni/ZSM-5(NZ3) as the catalysts for methanol to aromatics(MTA) were synthesized by a simple ultrasonic impregnation. The textural and acid properties of all catalysts were characterized using XRD, HRTEM, NH_3-TPD, Py-IR, XPS, XRF and TG techniques. The XRD and HRTEM results showed that the basic zeolite structures were not affected much with the incorporation of Zn and Ni species. However, great changes have taken place in acid properties. The Py-IR and XPS results indicated that the Zn-Lewis acid sites(ZnOH^+ species), which have stronger interaction with the zeolite framework compared with ZnO species, were generated at the expense of B acid sites with the incorporation of zinc species. Moreover, the product analysis results showed that the incorporation of zinc species promoted the primary aromatization by enhancing the dehydroaromatization and suppressing the cracking and subsequent H-transfer reaction. Furthermore, the addition of Ni species well inhibited the loss of zinc species by converting partial ZnO species to ZnOH^+ species, and thus improved the aromatization activity and catalyst stability. The catalytic performance results showed that the NZ3 possess higher conversion of methanol in a longer time and lower average rate of coke formation compared with NZ2. In addition,the NZ3 also exhibited the highest yield of BTX as the reaction proceeds. | Yanming Jia Junwen Wang Kan Zhang Wei Feng Shibin Liu Chuanmin Ding Ping Liu | 2017 | Journal of Energy Chemistry2017，26，3： | 7 |
| 2 | Effects of surface states over core-shell Ni@SiO_2 catalysts on catalytic partial oxidation of methane to synthesis gas显示文摘In the present work, core-shell Ni@Si O2 catalysts were investigated in order to evaluate the relevance of catalytic activity and surface states of Ni core as well as Ni nanoparticles size to catalytic partial oxidation of methane(POM). The catalysts were characterized by N2 adsorption,H2-TPR, XRD, TEM and XPS techniques. The catalytic performance of the core-shell catalysts was found to be dependent on the surface states of catalyst, which influenced the formation of products. It was considered that carbon dioxide formed on the oxidized nickel sites(Ni O)and carbon monoxide produced on the reduced sites(Ni). The surface states of active metal in the dynamic were influenced both by the size of Ni core and the porosity of silica shell. However, the catalytic activity would be debased when the size of Ni core was under a certain extent,which can be ascribed to the fact the carbon deposition increased with the increasing content of Ni O. The effects of surface states of Ni@Si O2 catalyst on the catalytic performance were discussed and the reaction pathway over Ni core encapsulated inside silica shell was proposed. | Chuanmin Ding Xiaofeng Gao Yulin Han Xishun Ma Junwen Wang Shibin Liu Kan Zhang | 2015 | Journal of Energy Chemistry2015，24，1： | 2 |
| 3 | Seroprevalence of influenza viruses in Shandong,Northern China during the COVID-19 pandemic显示文摘Nonpharmaceutical interventions(NPIs)have been commonly deployed to prevent and control the spread of the coronavirus disease 2019(COVID-19),resulting in a worldwide decline in influenza prevalence.However,the influenza risk in China warrants cautious assessment.We conducted a cross-sectional,seroepidemiological study in Shandong Province,Northern China in mid-2021.Hemagglutination inhibition was performed to test antibodies against four influenza vaccine strains.A combination of descriptive and meta-analyses was adopted to compare the seroprevalence of influenza antibodies before and during the COVID-19 pandemic.The overall seroprevalence values against A/H1N1pdm09,A/H3N2,B/Victoria,and B/Yamagata were 17.8%(95%CI 16.2%–19.5%),23.5%(95%CI 21.7%–25.4%),7.6%(95%CI 6.6%–8.7%),and 15.0(95%CI 13.5%–16.5%),respectively,in the study period.The overall vaccination rate was extremely low(2.6%).Our results revealed that antibody titers in vaccinated participants were significantly higher than those in unvaccinated individuals(P<0.001).Notably,the meta-analysis showed that antibodies against A/H1N1pdm09 and A/H3N2 were significantly low in adults after the COVID-19 pandemic(P<0.01).Increasing vaccination rates and maintaining NPIs are recommended to prevent an elevated influenza risk in China. | Chuansong Quan Zhenjie Zhang Guoyong Ding Fengwei Sun Hengxia Zhao Qinghua Liu Chuanmin Ma Jing Wang Liang Wang Wenbo Zhao Jinjie He Yu Wang Qian He Michael J.Carr Dayan Wang Qiang Xiao Weifeng Shi | 2022 | Frontiers of Medicine2022，16，6： | 1 |
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