The Ru-based catalysts with different preparation methods or supports were achieved and applied in efficientlycatalytic elimination of 1,2-dichloroethane(1,2-DCE).It wasfirstly found that the redox ability and chlorine...The Ru-based catalysts with different preparation methods or supports were achieved and applied in efficientlycatalytic elimination of 1,2-dichloroethane(1,2-DCE).It wasfirstly found that the redox ability and chlorine re-sistance of the catalyst could be improved by regulating the interaction between Ru and supports.Compared withother supports and conventionally impregnated methods,the Ru@ZSM-5 catalyst synthesized by the in-situ en-capsulation strategy exhibited an excellent low-temperature catalytic performance(T50=262°C,T90=327℃),superior stability in long-term test as well as ideal target products.The acidity,specific surface area,and in-teraction with precious metals of the supports have significant influences on the catalytic activity,and the Ruclusters inside the pore structures are more closely bound to the framework Al species,which promotes theoxidation behavior.The encapsulation strategy also significantly improves the Ru dispersion thereby facilitatesoxygen activation as well as Cl-containing volatile organic compounds(CVOCs)deep oxidation,and preserveslarge amounts of Brønsted acid sites to optimize the hydrolysis mechanism for purification of CVOCs.Subse-quently,the synergistic effect between metal redox and acidity is greatly optimized,thus extremely promotingthe catalytic efficiency of 1,2-DCE oxidation.展开更多
目的建立气相色谱-串联质谱法(gas chromatography-tandem mass spectrometry,GC-MS/MS)快速测定婴幼儿配方奶粉、冷冻饮品及食用油中2-氯-1,3-丙二醇(2-monochloropropane-1,3-diol,2-MCPD)和3-氯-1,2-丙二醇(3-monochloropropane-1,2-...目的建立气相色谱-串联质谱法(gas chromatography-tandem mass spectrometry,GC-MS/MS)快速测定婴幼儿配方奶粉、冷冻饮品及食用油中2-氯-1,3-丙二醇(2-monochloropropane-1,3-diol,2-MCPD)和3-氯-1,2-丙二醇(3-monochloropropane-1,2-diol,3-MCPD)的分析方法。方法本研究基于苯基硼酸作为衍生试剂,样品经氯化钠水溶液提取,玻璃硅藻土小柱净化,高速冷冻离心,加入一定量水去除过量苯基硼酸进行测定。以5%苯基-甲基聚硅氧烷毛细管色谱柱(30 m×0.25 mm,0.25μm)进行分离,质谱采用电子轰击源(electron bombardment ion source,EI)电离,选择反应监测(selected reaction monitoring,SRM)模式对婴幼儿配方奶粉、冷冻饮品及食用油中2-MCPD和3-MCPD进行定性和定量分析。结果该方法在婴幼儿配方奶粉、冷冻饮品及食用油3种基质中,方法线性范围为10~400 ng/mL,相关系数均在0.99以上,平均回收率在84.0%~107.8%之间,相对标准偏差(relative standard deviations,RSDs)在1.1%~9.3%之间。婴幼儿配方奶粉和冷冻饮品中2-MCPD和3-MCPD检出限均为10μg/kg;食用油中2-MCPD和3-MCPD检出限为30μg/kg;婴幼儿配方奶粉和冷冻饮品中2-MCPD和3-MCPD定量限均为25μg/kg;食用油中2-MCPD和3-MCPD定量限为100μg/kg。结论本方法样品前处理快速、简单,净化效果好,结果准确性高,适用于婴幼儿配方奶粉、冷冻饮品及食用油中2-MCPD和3-MCPD快速检测分析。展开更多
基金supported by the National Key Research and Development Program of China(No.2023YFC3905400)the National Natural Science Foundation of China(No.22176010).
文摘The Ru-based catalysts with different preparation methods or supports were achieved and applied in efficientlycatalytic elimination of 1,2-dichloroethane(1,2-DCE).It wasfirstly found that the redox ability and chlorine re-sistance of the catalyst could be improved by regulating the interaction between Ru and supports.Compared withother supports and conventionally impregnated methods,the Ru@ZSM-5 catalyst synthesized by the in-situ en-capsulation strategy exhibited an excellent low-temperature catalytic performance(T50=262°C,T90=327℃),superior stability in long-term test as well as ideal target products.The acidity,specific surface area,and in-teraction with precious metals of the supports have significant influences on the catalytic activity,and the Ruclusters inside the pore structures are more closely bound to the framework Al species,which promotes theoxidation behavior.The encapsulation strategy also significantly improves the Ru dispersion thereby facilitatesoxygen activation as well as Cl-containing volatile organic compounds(CVOCs)deep oxidation,and preserveslarge amounts of Brønsted acid sites to optimize the hydrolysis mechanism for purification of CVOCs.Subse-quently,the synergistic effect between metal redox and acidity is greatly optimized,thus extremely promotingthe catalytic efficiency of 1,2-DCE oxidation.
文摘目的建立气相色谱-串联质谱法(gas chromatography-tandem mass spectrometry,GC-MS/MS)快速测定婴幼儿配方奶粉、冷冻饮品及食用油中2-氯-1,3-丙二醇(2-monochloropropane-1,3-diol,2-MCPD)和3-氯-1,2-丙二醇(3-monochloropropane-1,2-diol,3-MCPD)的分析方法。方法本研究基于苯基硼酸作为衍生试剂,样品经氯化钠水溶液提取,玻璃硅藻土小柱净化,高速冷冻离心,加入一定量水去除过量苯基硼酸进行测定。以5%苯基-甲基聚硅氧烷毛细管色谱柱(30 m×0.25 mm,0.25μm)进行分离,质谱采用电子轰击源(electron bombardment ion source,EI)电离,选择反应监测(selected reaction monitoring,SRM)模式对婴幼儿配方奶粉、冷冻饮品及食用油中2-MCPD和3-MCPD进行定性和定量分析。结果该方法在婴幼儿配方奶粉、冷冻饮品及食用油3种基质中,方法线性范围为10~400 ng/mL,相关系数均在0.99以上,平均回收率在84.0%~107.8%之间,相对标准偏差(relative standard deviations,RSDs)在1.1%~9.3%之间。婴幼儿配方奶粉和冷冻饮品中2-MCPD和3-MCPD检出限均为10μg/kg;食用油中2-MCPD和3-MCPD检出限为30μg/kg;婴幼儿配方奶粉和冷冻饮品中2-MCPD和3-MCPD定量限均为25μg/kg;食用油中2-MCPD和3-MCPD定量限为100μg/kg。结论本方法样品前处理快速、简单,净化效果好,结果准确性高,适用于婴幼儿配方奶粉、冷冻饮品及食用油中2-MCPD和3-MCPD快速检测分析。
