An easy workup and environmentally friendly method to convert ethylbenzene into the corresponding oxides, catalyzed by a combined catalytic system consisting of NHPI and CoSPc, was developed in a water involved liquid...An easy workup and environmentally friendly method to convert ethylbenzene into the corresponding oxides, catalyzed by a combined catalytic system consisting of NHPI and CoSPc, was developed in a water involved liquid-liquid heterogeneous system. Experimental results showed that the reaction performed well facilitated by PTCs at multigrams material level, under which the conversion rate of ethylbenzene and the selectivity of acetophenone reached 60.6% and 95.2% after 0.5 h of reaction in oxygen atmosphere. An oxidation process was orooosed at the end of this oaoer.展开更多
针对电阻发热元件普遍存在加热温度分布不均匀的问题,本文采用电热耦合仿真方法对发热元件的结构和材料进行研究与优化,以降低不同区域的温度差值。首先,采用温度均匀系数作为发热元件温度均匀性的量化指标,研究发热元件的折弯间隙宽度...针对电阻发热元件普遍存在加热温度分布不均匀的问题,本文采用电热耦合仿真方法对发热元件的结构和材料进行研究与优化,以降低不同区域的温度差值。首先,采用温度均匀系数作为发热元件温度均匀性的量化指标,研究发热元件的折弯间隙宽度、内倒角和外倒角等折弯结构参数对温度分布均匀性的影响,在原发热元件基础上优化设计了一种能实现最佳温度均匀性的发热元件结构,其主要采用R1=0.3 mm的内倒圆与外直角结合的折弯结构,间隙宽度为0.5 mm。进一步研究了不同PTC(Positive Temperature Coefficient)材料对温度分布均匀性的影响,结果表明具有较高电阻率和较高热导率的铝铜合金材料有助于改善发热元件的温度均匀性。展开更多
The removal of harmful cyanobacterial blooms(HCBs)and reuse of the resulting algal sludge are pressing issues in current environmental governance and ecological conservation.Aiming at tackling the abovementioned chall...The removal of harmful cyanobacterial blooms(HCBs)and reuse of the resulting algal sludge are pressing issues in current environmental governance and ecological conservation.Aiming at tackling the abovementioned challenges,titanium(Ti)-based coagulants are promising candidates.However,most of them suffer from poor stability and weak actual algal removal ability,and recycling of the algal sludge usually produces titanium dioxide(TiO_(2))with low photocatalytic ability.In this work,a lanthanum(La)-modified polytitanium chloride(La-PTC)coagulant is reported.La in the La-PTC coagulant serves a"kill two birds with one stone"strategy in algae removal and algae sludge reuse.Owing to the introduction of La ions,the La-PTC coagulant exhibits ultra-high stability and excellent algae removal capability with an efficiency of 98.71%,which is 7.25%higher than that of PTC coagulant.Moreover,recycling algae sludge can prepare high catalytic(2.45 times the commercial P25 TiO_(2))La/C-TiO_(2),where the presence of La enhances its visible light response range and inhibits electron hole recombination.The strategy of this La modified coagulant can not only achieve efficient re moval of HCBs,but also transfo rm the recovered algal sludge into photocatalysts with higher catalytic capacity.展开更多
基金Fundamental Research Funds for the Central Universities (No. 10CX04024A)the financial support from Natural Science Foundation of Shandong Province (No. 2009ZRA05107)
文摘An easy workup and environmentally friendly method to convert ethylbenzene into the corresponding oxides, catalyzed by a combined catalytic system consisting of NHPI and CoSPc, was developed in a water involved liquid-liquid heterogeneous system. Experimental results showed that the reaction performed well facilitated by PTCs at multigrams material level, under which the conversion rate of ethylbenzene and the selectivity of acetophenone reached 60.6% and 95.2% after 0.5 h of reaction in oxygen atmosphere. An oxidation process was orooosed at the end of this oaoer.
文摘针对电阻发热元件普遍存在加热温度分布不均匀的问题,本文采用电热耦合仿真方法对发热元件的结构和材料进行研究与优化,以降低不同区域的温度差值。首先,采用温度均匀系数作为发热元件温度均匀性的量化指标,研究发热元件的折弯间隙宽度、内倒角和外倒角等折弯结构参数对温度分布均匀性的影响,在原发热元件基础上优化设计了一种能实现最佳温度均匀性的发热元件结构,其主要采用R1=0.3 mm的内倒圆与外直角结合的折弯结构,间隙宽度为0.5 mm。进一步研究了不同PTC(Positive Temperature Coefficient)材料对温度分布均匀性的影响,结果表明具有较高电阻率和较高热导率的铝铜合金材料有助于改善发热元件的温度均匀性。
基金Project supported by the National Natural Science Foundation of China(62175266,61775245)。
文摘The removal of harmful cyanobacterial blooms(HCBs)and reuse of the resulting algal sludge are pressing issues in current environmental governance and ecological conservation.Aiming at tackling the abovementioned challenges,titanium(Ti)-based coagulants are promising candidates.However,most of them suffer from poor stability and weak actual algal removal ability,and recycling of the algal sludge usually produces titanium dioxide(TiO_(2))with low photocatalytic ability.In this work,a lanthanum(La)-modified polytitanium chloride(La-PTC)coagulant is reported.La in the La-PTC coagulant serves a"kill two birds with one stone"strategy in algae removal and algae sludge reuse.Owing to the introduction of La ions,the La-PTC coagulant exhibits ultra-high stability and excellent algae removal capability with an efficiency of 98.71%,which is 7.25%higher than that of PTC coagulant.Moreover,recycling algae sludge can prepare high catalytic(2.45 times the commercial P25 TiO_(2))La/C-TiO_(2),where the presence of La enhances its visible light response range and inhibits electron hole recombination.The strategy of this La modified coagulant can not only achieve efficient re moval of HCBs,but also transfo rm the recovered algal sludge into photocatalysts with higher catalytic capacity.
