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手性加氢
相关语句
  chiral hydrogenation
     Pd-chitosan Heterogeneous Catalyst for Chiral Hydrogenation
     SiO_2负载壳聚糖-Pd多相手性加氢催化剂
短句来源
  “手性加氢”译为未确定词的双语例句
     Chiral Heterogeneous Catalyst of Pd-chitosan Supported on SiO_2 for Transfer Hydrogenation of Acetophenone
     壳聚糖负载Pd催化剂的制备和在苯乙酮手性加氢中的作用
短句来源
     The effects of active metal M(Pt,Pd,Rh and Ru),support(ZSM-5,β-zeolite,MCM-41 and SiO_2)and Pd precursor on the performance of chiral M-CS-support catalyst were also studied.
     研究了活性金属(Pd、P t、Rh和Ru)、载体(ZSM-5、β、M CM-41、S iO2),及钯的前驱物对多相手性加氢催化剂性能的影响。
短句来源
     The natural biopolymer of chitosan was supported on the surface of silicon dioxide, and then palladium was coordinated on it, to prepare the palladium-chitosan-silica complex (Pd-CS-SiO_2)chiral heterogeneous catalyst.
     将天然手性高分子聚合物壳聚糖(CS)负载到SiO2上制得CS-SiO2载体,通过配位反应将Pd链接到该载体上,制得多相Pd-CS-SiO2手性加氢催化剂.
短句来源
     A chiral heterogeneous hydrogenation catalyst ( M-CS-SiO2 ) was prepared by supporting transition metal on natural macromolecular biopolymer of chitosan covering on silicon dioxide, and characterized with elemental analysis, FT-IR and XRD. The catalytic performance of the chiral catalyst was investigated for the asymmetric transfer hydrogenation of acetophenone to R(S)-1-phenyl ethanol in ambient condition.
     将天然手性高分子聚合物壳聚糖负载到二氧化硅上,再负载活性金属制得了多相手性加氢催化剂 (M-CS-SiO2),用元素分析、FT-IR和XRD测试技术对催化剂进行了表征,并在空气氛围下,考察了对苯乙酮不对称氢转移加氢反应的催化活性和产物的对映选择性。
短句来源
     Natural biopolymer of chitosan was supported on SiO_2,and then active metal(Pd,Pt,Ru and Rh)was coordinated with chitosan to obtain a chiral heterogeneous catalyst of M-CS-SiO_2.Under air atmosphere condition and isopropanol as H-donor,the chiral catalytic activity of M-CS-SiO_2 for the asymmetric transfer hydrogenation of acetophenone was investigated.
     将天然手性高分子聚合物壳聚糖(CS)负载到S iO2上后,再络合M(Pd、P t、Pu和Ph)金属,制得了多相手性加氢催化剂M-CS-S iO2。 在空气氛围下,以异丙醇为氢源,考察了M-CS-S iO2对苯乙酮不对称催化氢转移加氢反应的催化活性。
短句来源
  相似匹配句对
     Chiral Compounds
     手性化合物
短句来源
     Chirotechnology
     手性技术
短句来源
     Chiral Heterogeneous Catalyst of Pd-chitosan Supported on SiO_2 for Transfer Hydrogenation of Acetophenone
     壳聚糖负载Pd催化剂的制备和在苯乙酮手性加氢中的作用
短句来源
     Pd-chitosan Heterogeneous Catalyst for Chiral Hydrogenation
     SiO_2负载壳聚糖-Pd多相手性加氢催化剂
短句来源
     The Hydrogenation of Two Tar from The Coal
     煤焦油的加氢反应性
短句来源
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  chiral hydrogenation
Effective and Reusable Pt Catalysts Supported on Periodic Mesoporous Resols for Chiral Hydrogenation
      


The natural biopolymer of chitosan was supported on the surface of silicon dioxide, and then palladium was coordinated on it, to prepare the palladium-chitosan-silica complex (Pd-CS-SiO_2)chiral heterogeneous catalyst. The asymmetric transfer hydrogenation of acetophenone to R(S)-1-phenyl ethanol in atmosphere with 2-propanol as H-donor and solvent was studied as a model reaction. The effects of the Pd loading, reaction temperature, reaction time, and promoter of base on the performance of the catalyst...

The natural biopolymer of chitosan was supported on the surface of silicon dioxide, and then palladium was coordinated on it, to prepare the palladium-chitosan-silica complex (Pd-CS-SiO_2)chiral heterogeneous catalyst. The asymmetric transfer hydrogenation of acetophenone to R(S)-1-phenyl ethanol in atmosphere with 2-propanol as H-donor and solvent was studied as a model reaction. The effects of the Pd loading, reaction temperature, reaction time, and promoter of base on the performance of the catalyst were investigated. The results indicate that the Pd-CS-SiO_2 catalyst has a good catalytic activity and selectivity to the product for the asymmetric hydrogen transfer reduction of acetophenone. The addition of NaOH can increase the reaction rate and conversion of acetophenone significantly. The conversion of acetophenone increases with an increase of the Pd loading, but the enantiomeric excesses of 1-phenyl ethanol is higher at lower Pd loading. After reaction at 80 ℃ for 24 h, the conversion of acetophenone is 100% with 98% selectivity to 1-phenyl ethanol. At 30 ℃, the enantiomeric excess of R-1-phenyl ethanol reaches to 13.7%.

将天然手性高分子聚合物壳聚糖(CS)负载到SiO2上制得CS-SiO2载体,通过配位反应将Pd链接到该载体上,制得多相Pd-CS-SiO2手性加氢催化剂.以苯乙酮不对称氢转移加氢为模型反应,在空气氛围中研究了Pd-CS-SiO2的催化反应性能,考察了Pd的负载量、碱助剂、反应温度、反应时间等对反应转化率、选择性和对映选择性等的影响.结果表明,Pd-CS-SiO2催化剂具有较好的催化活性和选择性.使用强碱NaOH为助催化剂时,可提高氢转移加氢反应的速率和转化率;高的Pd负载量有利于苯乙酮转化率的提高,降低Pd的负载量有利于提高产物的对映选择性;提高反应温度有利于提高催化剂的反应活性,降低反应温度有利于提高产物的对映选择性.在30℃反应24h,产物R-1-苯乙醇的对映体过量值可达13.7%.

A chiral heterogeneous hydrogenation catalyst ( M-CS-SiO2 ) was prepared by supporting transition metal on natural macromolecular biopolymer of chitosan covering on silicon dioxide, and characterized with elemental analysis, FT-IR and XRD. The catalytic performance of the chiral catalyst was investigated for the asymmetric transfer hydrogenation of acetophenone to R(S)-1-phenyl ethanol in ambient condition. The results indicate that among the chiral M-CS-SiO2(M = Pd, Pt, Rh and Ru) catalysts prepared, the Pd-CS-SiO2...

A chiral heterogeneous hydrogenation catalyst ( M-CS-SiO2 ) was prepared by supporting transition metal on natural macromolecular biopolymer of chitosan covering on silicon dioxide, and characterized with elemental analysis, FT-IR and XRD. The catalytic performance of the chiral catalyst was investigated for the asymmetric transfer hydrogenation of acetophenone to R(S)-1-phenyl ethanol in ambient condition. The results indicate that among the chiral M-CS-SiO2(M = Pd, Pt, Rh and Ru) catalysts prepared, the Pd-CS-SiO2 catalyst shows the best catalytic activity and enantioselectivity to R-1-phenyl ethanol, and the palladium precursor affects its catalytic performance very little. In the asymmetric transfer hydrogenation of acetophenone catalyzed with Pd-CS-SiO2,the catalytic activity and the enantioselectivity are greatly influenced by the sort of H-donor used and reaction temperature. Ammonium formate and sodium formate are the suitable hydrogen donors. If there is some water in the solvent, the asymmetric transfer hydrogenation of acetophenone will be deteriorated as ammonium formate is used as H-donor;when sodium formate is used as H-donor, the presence of 5% water in the solvent can increase 8.4% enantiomeric excess. When ammonium formate was used as hydrogen donor and the asymmetric transfer hydrogenation of acetophenone was performed at 80 ℃ , the enantiomeric excess of R-1 -phenylethanol reached to 69%.

将天然手性高分子聚合物壳聚糖负载到二氧化硅上,再负载活性金属制得了多相手性加氢催化剂 (M-CS-SiO2),用元素分析、FT-IR和XRD测试技术对催化剂进行了表征,并在空气氛围下,考察了对苯乙酮不对称氢转移加氢反应的催化活性和产物的对映选择性。结果表明,活性金属组分对手性催化剂的性能有较大的影响,在研究的Pd、Pt、Rh和Ru催化剂中,Pd催化剂具有最好的催化活性和R-1-苯乙醇的对映选择性, 不同的Pd前驱物对催化剂的性能影响较小。在Pd-CS-SiO2催化的苯乙酮不对称加氢反应中,氢源和反应温度对催化剂的活性和产物的对映选择性影响较大,甲酸铵和甲酸钠是优良的氢源。以甲酸铵为氢源时,少量水的存在对苯乙酮不对称转移加氢反应有抑制作用;以甲酸钠为氢源时,添加质量分数为5%的水时,产物的对映选择性可增加8.4%。在80℃反应时,产物R-1-苯乙醇的对映选择性达到69%。

Natural biopolymer of chitosan was supported on SiO_2,and then active metal(Pd,Pt,Ru and Rh)was coordinated with chitosan to obtain a chiral heterogeneous catalyst of M-CS-SiO_2.Under air atmosphere condition and isopropanol as H-donor,the chiral catalytic activity of M-CS-SiO_2 for the asymmetric transfer hydrogenation of acetophenone was investigated.The effects of active metal M(Pt,Pd,Rh and Ru),support(ZSM-5,β-zeolite,MCM-41 and SiO_2)and Pd precursor on the performance of chiral M-CS-support catalyst were...

Natural biopolymer of chitosan was supported on SiO_2,and then active metal(Pd,Pt,Ru and Rh)was coordinated with chitosan to obtain a chiral heterogeneous catalyst of M-CS-SiO_2.Under air atmosphere condition and isopropanol as H-donor,the chiral catalytic activity of M-CS-SiO_2 for the asymmetric transfer hydrogenation of acetophenone was investigated.The effects of active metal M(Pt,Pd,Rh and Ru),support(ZSM-5,β-zeolite,MCM-41 and SiO_2)and Pd precursor on the performance of chiral M-CS-support catalyst were also studied.Results show that Pd-CS-SiO_2 catalyst has better chiral catalytic activity to acetophenone and enantioselectivity to(R)-1-phenylethanol.Pd precursor has minor effect on its catalytic activity for the hydrogenation of acetophenone.The supports used affect obviously the performance of M-CS-support catalyst.For the asymmetric transfer hydrogenation of acetophenone with isopropanol used as solvent and H-donor,Pd-CS-β zeolite catalyst has better enantioselectivity,over which the enantiomeric excess of(R)-1-phenylethaol reaches to 65.7%.

将天然手性高分子聚合物壳聚糖(CS)负载到S iO2上后,再络合M(Pd、P t、Pu和Ph)金属,制得了多相手性加氢催化剂M-CS-S iO2。在空气氛围下,以异丙醇为氢源,考察了M-CS-S iO2对苯乙酮不对称催化氢转移加氢反应的催化活性。研究了活性金属(Pd、P t、Rh和Ru)、载体(ZSM-5、β、M CM-41、S iO2),及钯的前驱物对多相手性加氢催化剂性能的影响。结果表明:Pd-CS-S iO2对苯乙酮不对称转移加氢反应具有较好的催化加氢性能和对R-1-苯乙醇的对映选择性;Pd的前驱物对Pd-CS-S iO2的催化活性和对映选择性的影响较小;载体对Pd催化剂的催化活性和对映选择性的影响很大;在苯乙酮不对称转移加氢反应中,Pd-CS-β分子筛对R-1-苯乙醇的对映体过量值可达到65.7%。

 
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