Semidifferential Electroanalysis of Aqueous Triton X—100／Toluene／H2O Microemulsion

Semidifferential electroanalysis is used as an effective method for investigating microstructure and structural transition of Triton X-100 microemulsions.     

SO^2—4／TiO2和SO^2—4／Fe2O3固体超强酸研究

用ＸＲＤ、ＴＧ－ＤＴＧ、ＳＥＭ和化学分析等手段研究了浸渍Ｈ２ＳＯ４的无定形ＴｉＯ２和Ｆｅ２Ｏ３在焙烧过程中的晶化、相变、失水及失硫情况，总结出ＳＯ＾２－４／ＭｘＯｙ型固体超强酸具有与ＳＯ＾２－４／ＺｒＯ２体系相同的形成规律。用ＩＲ光谱和常温正戊烷异构化反应对ＳＯ＾２－４／ＴｉＯ２／Ｆｅ２Ｏ３的超强酸性进行了表征，表明它们与ＳＯ＾２－４／ＺｒＯ２体系具有相似的表面酸位结构，无水状态主要为Ｌ酸位，吸水     

Reaction Chemistry of W—Mn／SiO2 Catalyst for the Oxidative Coupling of Methane

Reaction chemistry of the OCM reaction on W-Mn/SiO2 catalyst has been reviewed in this account.Initial activity and selectivity,stability in a long-term reaction,reaction at elevated pressures and a modelling test in a stainless-steel fluidized-bed reactor show that W-Mn/SiO2 has promising performance for the development of an OCM process that directly produces ethylene from natural gas.A study on surface catalytic reaction kinetics and used cataly st structure characterization revealed a possible reason why C2 and COx selectivity changed during the long-term reaction.Further improvement of the catalyst composition and preparation metbod should be a future direction of study on OCM reaction over W-Mn/SiO2 catalyst.     

部分水解法制备高分子量水溶性（丙烯酰胺／丙烯酸／2—丙烯酰胺—2—？…

系列的谪分子量水溶性丙烯酰胺／丙烯酸／２－丙烯酰胺－２－甲基丙磺酸（ＡＭ／ＡＡ／ＡＭＰＳ）三元共聚物（Ｐ３Ａ）由相应的（ＡＭ／ＡＭＰＳ０二元共聚物通过部分水解方法制得。聚合物的结构和组成使用电位滴定和＾１３Ｃ－ＮＭＲ谱测定,得到的结果指出,在设定的试验条件下,水解过程中,高分子链上ＡＭＰＳ单元具有充分的稳定性,而丙烯酰胺基平稳地转变为丙烯酸。在所有不同聚合物（Ｐ２Ａ）情况下,由于阴离子基团的ＯＨ＾     

Investigation of Isomerization of 2—Seleno—1,3,2—diazaphospholidine Derivatives

For the first time the isomerization of 1,3,2-diazaphospholidine-2-sclenide dervatives in refluxing benzene in the presence of trace water was observed. The structures of isomerized products were determined by IR, ^1H NMR,^31P NMR, elemental analysis and X-ray crystallography. The mechanism of isomerization was also proposed.     

SO4^2—／ZrO2和SO4^2—／Al2O3—ZrO催化剂上的正戊烷反应

研究了添加Ａｌ对ＳＯ４＾２－／ＺｒＯ２超强酸样品的晶化,比表面、硫含量、超强酸性和正戊烷反应性能的影响,考察了活化温度、反应温度、Ａｌ含量和载Ｐｔ对催化剂活性和选择性的影响。ＳＯ４＾２／Ａｌ２Ｏ３－ＺｒＯ２催化剂的酸强度与ＳＯ４＾２－／ＺｒＯ２基本相当,但超强酸位经后者多,未载Ｐｔ时正戊烷反应活性和稳定性明显高于后者,负载Ｐｔ后,正戊烷异构化选择性和稳定性大大提高,但Ｐｔ／ＳＯ４＾２－／Ａｌ２Ｏ３     

Influence of Pretreatment Conditions on Methane Aromatization Performance of Mo／HZSM—5 and Mo—Cu／HZSM—5 Catalysts

Mo/HZSM-5 is a good catalyst for methane aromatization, and the reaction performance of Mo/HZSM-5 and Cu modified Mo/HZSM-5 catalysts under various pretreatment conditions has been studied. The results indicate that the catalyst presented a distinguished catalytic activity, benzene selectivity and a high stability when the bed temperature was raised in N2 atmosphere.     

SO^2—4／ZrO2—SiO2催化剂的酸性及结构表征

采用指示剂法及吸附吡啶的红外光谱法，考察了催化剂的酸性；用ＸＲＤ，ＩＲ，ＸＰＳ及热分析等对催化剂的结构进行了表征；用ＢＥＴ法测定了催化剂的比表面积，并研究了催化剂的组成及焙地催化剂比表面积的影响。实验结果表明，一般在４５０℃以上焙烧的ＳＯ＾２－４／ＺｒＯ２－ＳｉＯ２催化剂均具有超强酸性，催化剂的酸强度随焙烧温度的增高有所增强，吸附吡啶的红外不谱表明该催化剂具有较高的Ｌｅｗｉｓ酸量。通常８００℃以下     

Na—W—Mn／SiO2催化剂表面甲烷脉冲反应I.单组分Na／、W／、Mn／SiO2催化剂

制备了单组分Na/、W/、Mn/SiO2催化剂，在ITD（Ion Trap Detector）装置上进行了催化剂表面晶格氧脱附前后的甲烷恒温脉冲反应（CH4-CTPR），研究结果表明，N a/SiO2表面晶格氧具有一定的C2烃选择性，并能强烈抑制CO2的生成，W/SiO2表面晶格氧对C2烃的选择性较差，但对Cox具有高的选择性；Mn/SiO2表面的晶格氧对C2H4和CO具有高选择性，而较深部位的晶格氧则对C2H6和CO2具有高的选择性。     

Combination of Partial Oxidation and CO2 Reforming of Methane over Monolithic Ni／CeO2-ZrO2／γ-Al2O3 Catalyst

A new monolithic Ni/CeO2-ZrO2/γ-Al2O3 catalyst for combined partial oxidation and CO2 reforming of methane was prepared. The result shows that the addition of O2 to the feed can improve the activity of the catalyst and adjust the H2/CO ratio of the productive gases.     

Study on the Phase Behavior of Supercritical CO2／Dynol—604／Water System and Solubilization of Methyl Orange in the Microemulsions

It was found that Dynol-604, a non-fluorous and no silicon-containing nonionic surfactant,was soluble in supercritical (SC) CO2. The phase behavior of SC CO2/Dynol-604/water system was studies. The results showed that one-phase water-in-CO2 microemulsions could be fromed. The solubilization of methyl orange in the microemulsions proved further the existence of water domain in the microemulsions.     

Effect of La2O3／γ—Al2O3 Catalyst on the Activation of CH4 and CO2 to C2 Hydrocarbons under Non—equilibrium Plasma

In the reaction of methane and carbon dioxide to C2 hydrocabons under non-equilibrium plasma, methane conversion was decreased,but selectivity of C2 hydroxarbons was increased when using La2O3/γ-Al2O3 as catalyst. So the yield of C2 hydrocarbons was higher than using plasma alone. The synergism of La2O3/γ-Al2O3 and plasma gave methane conversion of 24.9% and C2 yield of 18.1%. The distribution of C2 hydrocarbons changed when Pd-La2O3/γ-Al2O3 was used as catalyst,the major C2 product was ethylene.     

SO4^2—／ZrO2—SiO2催化剂的制备及其对乙酸／丁醇酯化反应的催化作用

用０．５￣１．０ｍｏｌ／Ｌ Ｈ２ＳＯ４溶液处理ＺｒＯ２含量为３％￣５０％（摩尔分数）的锆硅复合氧化物，制得ＳＯ４＾２－／ＺｒＯ２－ＳｒＯ２催化剂。考察了催化剂对乙酸／丁醇酯化反应的催化作用及其制备条件（如：Ｚｒ／Ｓｉ比、沉淀剂、预焙烧温度、焙烧温度等）对催化剂性能的影响。实验结果表明，对于给定的反应，使用ＺｒＯ２含量约为１０％的ＳＯ４＾２－ＳｉＯ２催化剂时，乙酸的转化率高于９８％；而在相同条件下使     

Chemo-enzymatic Synthesis of Z-Asp-Val-Tyr-NH_2——A Precursor Tripeptide of Thymopentin

Z-Asp-Val-Tyr-NH2,a precursor tripeptide of thymopentin(TP-5),was successfully synthesized by a combination of chemical and enzyme methods.Firstly,the precursor dipeptide Val-Tyr-NH2 was synthesized by a novel chemical method in four steps including the preparation of NCA-Val,the esterification of L-tyrosine and the ammonolysis of L-tyrosine ethyl ester,and the formation of Val-Tyr-NH2 from NCA-Val and L-Tyr-NH2.Secondly,a thermolysin,thermoase PC 10F was used to catalyze the formation of Z-Asp-Val-Tyr-NH2 in an aqueous/organic solvent diphase system with Z-Asp-OH and Val-Ty-NH2 as the substrates under thermodynamic control.The optimum conditions were pH=6.5,40 ℃,thermoase 100 mg,in 2-(N-morpholino) ethanesulfonic acid MES/NaOH(containing 5 mmol/L CaCl2) of n-butanol system(15/85,volume ratio) for 20 h in a maximum yield of 27.02%.     

Accurate Mass Determination of Amino Alcohols by Turboionspray／Time—of—Flight Mass Spectrometry

ＩｎｔｒｏｄｕｃｔｉｏｎＡｍｉｎｏａｌｃｏｈｏｌｓａｒｅａｎｉｍｐｏｒｔａｎｔｃｌａｓｓｏｆｃｏｍｐｏｕｎｄｓｉｎｓｙｎｔｈｅｔｉｃｏｒｇａｎｉｃｒｅａｃｔｉｏｎｓ .Ｔｈｅｉｒｍｏｌｅｃｕｌｅｓｔｒｕｃｔｕｒｅｓｂｅｃｏｍｅｕｎｓｔｅａｄｙｗｈｅｎａｎａｌｙｚｅｄｂｙｅｌｅｃｔｒｏｎｉｍｐａｃｔ(ＥＩ) .ＴｈｅｆｒａｇｍｅｎｔｓｏｂｔａｉｎｅｄｆｒｏｍＥＩａｒｅｕｓｕａｌｌｙａｓ ｓｉｇｎｅｄｔｏｎｅｕｔｒａｌｌｏｓｓｅｓｓｕｃｈａｓＨ2 Ｏ ,ＣＨ3 ＯＨ (Ｆｉｇ .1) .ＥＩｉｓｎｏｔａｕｓｅｆｕｌｍｅ…     

2—氯／2—甲磺酰基—5—（2—苯基—4—喹啉基）—1,3,4—恶二唑…

借处理２－羟基－５－（２－苯基－４－喹啉基）－１，３，４－恶二唑同ＰＣｌ５／ＰＯＣｌ３之间的反应合成了２－氯－５－（２－苯基－４－喹啉基）－１，３，４－恶二唑（３）和通过２－Ｙｕ基－５－（２－苯基－４－喹啉基）－１，３，４－恶二唑的甲基化，然后氧化制得２－甲磺酰基－５－（２－苯基－４－喹啉基）－１，３，４－恶二唑（６）。并分别研究了３和６同胺、叠氮及肼的反应，得到２，５－二取代的恶二唑新衍生物。初