An effective catalytic transfer hydrogenation (CTH) process of bio-based levulinate esters into γ-valerolactone (GVL) was explored over ternary Cu/ZnO/Al2O3 catalyst which was prepared by coprecipitation method and c...An effective catalytic transfer hydrogenation (CTH) process of bio-based levulinate esters into γ-valerolactone (GVL) was explored over ternary Cu/ZnO/Al2O3 catalyst which was prepared by coprecipitation method and could be sustainably used. As a result, quantitative conversion of ethyl levulinate (EL) and 99.0% yield of GVL were obtained in the CTH process using i-PrOH as hydrogen donor. The Cu/ZnO/Al2O3 catalyst with high-surface-area could be reused at least four times without the loss of catalytic activity. Furthermore, the structure and properties of Cu/ZnO/Al2O3 catalyst was characterized through XRD, BET, SEM, TEM and H2-TPR. Also, the influence of different support oxides and calcination temperatures was investigated.展开更多
Because of its advantages of light weight, high strength and convenient construction, steel structure has gradually become the first choice for large-span and high-rise structures. The use of high strength steel in bu...Because of its advantages of light weight, high strength and convenient construction, steel structure has gradually become the first choice for large-span and high-rise structures. The use of high strength steel in building engineering can reduce the section size of components and the weight of the structure, thus increasing the building area. But steel is not fire-resistant, when the temperature reaches 600<span style="white-space:nowrap;">°</span>C, steel loses most of the stiffness and strength. Therefore, it is of great significance to study the fire resistance of steel structures, and the mechanical properties of steel structures at high temperature are the foundation of the fire resistance research. The mechanical properties of steel after high temperature are the basis for the safety assessment of steel structure after fire. Therefore, this paper studies the mechanical properties of Q345 steel after high temperature cooling.展开更多
The adsorption removal of anti-inflammatory drugs from water by diverse materials has drawn great attention.This study investigated the adsorption of sulfamethoxazole(SMX)by two types of materials,UiO-66 and UiO-66-BC...The adsorption removal of anti-inflammatory drugs from water by diverse materials has drawn great attention.This study investigated the adsorption of sulfamethoxazole(SMX)by two types of materials,UiO-66 and UiO-66-BC composites.Highly porous MOF composites with functional groups were synthesized by combining UiO-66 with corncob-based biochar at different molar ratios.SEM results showed that macroporosity of UiO-66-BC composites was increased by increasing the ratio of biochar.It was found that UiO-66-BC composites displayed highly improved adsorption performance of SMX relative to pristine UiO-66.UiO-66-BC(5%)had the highest SMX adsorption capacity,about 2.4 times those of pristine UiO-66.It was the high surface area of UiO-66 and redundant functional groups of biochar that increased the adsorption performance of composites.Moreover,UiO-66-BC can be reused and displayed the competitive adsorption efficiency after successive adsorption,which made it a potential adsorbent for the removal of SMX from water.展开更多
基金the financial support from the State Key Program of the National Natural Science Foundation of China(No.21436007)the support from the central laboratory of SESE in SJTU
文摘An effective catalytic transfer hydrogenation (CTH) process of bio-based levulinate esters into γ-valerolactone (GVL) was explored over ternary Cu/ZnO/Al2O3 catalyst which was prepared by coprecipitation method and could be sustainably used. As a result, quantitative conversion of ethyl levulinate (EL) and 99.0% yield of GVL were obtained in the CTH process using i-PrOH as hydrogen donor. The Cu/ZnO/Al2O3 catalyst with high-surface-area could be reused at least four times without the loss of catalytic activity. Furthermore, the structure and properties of Cu/ZnO/Al2O3 catalyst was characterized through XRD, BET, SEM, TEM and H2-TPR. Also, the influence of different support oxides and calcination temperatures was investigated.
文摘Because of its advantages of light weight, high strength and convenient construction, steel structure has gradually become the first choice for large-span and high-rise structures. The use of high strength steel in building engineering can reduce the section size of components and the weight of the structure, thus increasing the building area. But steel is not fire-resistant, when the temperature reaches 600<span style="white-space:nowrap;">°</span>C, steel loses most of the stiffness and strength. Therefore, it is of great significance to study the fire resistance of steel structures, and the mechanical properties of steel structures at high temperature are the foundation of the fire resistance research. The mechanical properties of steel after high temperature are the basis for the safety assessment of steel structure after fire. Therefore, this paper studies the mechanical properties of Q345 steel after high temperature cooling.
基金This work was financially supported by grants from the National Natural Science Foundation of China(grant Nos.22068002,21776225)Natural Science Foundation of Jiangxi Province(grant No.20202BABL203020).
文摘The adsorption removal of anti-inflammatory drugs from water by diverse materials has drawn great attention.This study investigated the adsorption of sulfamethoxazole(SMX)by two types of materials,UiO-66 and UiO-66-BC composites.Highly porous MOF composites with functional groups were synthesized by combining UiO-66 with corncob-based biochar at different molar ratios.SEM results showed that macroporosity of UiO-66-BC composites was increased by increasing the ratio of biochar.It was found that UiO-66-BC composites displayed highly improved adsorption performance of SMX relative to pristine UiO-66.UiO-66-BC(5%)had the highest SMX adsorption capacity,about 2.4 times those of pristine UiO-66.It was the high surface area of UiO-66 and redundant functional groups of biochar that increased the adsorption performance of composites.Moreover,UiO-66-BC can be reused and displayed the competitive adsorption efficiency after successive adsorption,which made it a potential adsorbent for the removal of SMX from water.
