甲醇中甲苯溶液标准物质的研制

介绍甲醇中甲苯溶液标准物质的制备方法。以重量–容量法制备甲醇中甲苯溶液标准物质,以计算值作为标准物质的特性量值。采用气相色谱法、卡尔·费休法、电感耦合等离子体质谱法等分别对原料中的主成分、金属元素及水分含量准确定量。方差分析和线性拟合结果表明,该溶液标准物质具有良好的均匀性和稳定性。甲醇中甲苯溶液标准物质特性值为996.73μg/mL,相对扩展不确定度为2%(k=2)。     

甲烷直接氧化制甲醇Ⅲ．反应气吹扫催化膜反应器（RSCMR）

用溶胶－凝胶法制备了“ＳｉＯ＿２／陶瓷”非对称无机膜，并用该膜制备了反应气吹扫催化膜反应器（ＲＳＣＭＲ）装置。在ＲＳＣＭＲ上考察了甲烷一步催化氧化制甲醇反应。结果表明，在研究的范围内，增加氧气或甲烷的浓度和吹扫气的流速（即总的反应气流量）有利于提高甲醇的收率；甲醇在反应条件下的热不稳定性是影响目标反应选择性的重要原因。ＲＳＣＭＲ较膜反应器（ＣＭＲ）系统能更有效地抑制甲醇的热分解，因而可得到较ＣＭＲ更高的甲醇收率。当反应温度为７００℃时，甲醇的收率在ＣＭＲ中为０．５ｇ／ｍ￣２ｈ，在ＲＳＣＭＲ中可达０．９ｇ／ｍ￣２ｈ。     

激光参数对甲醇激光表面反应性能的影响规律

以Ｓｉｏ２和ＰＭｏ１２为表面材料，用可选频脉冲ＴＥＡ－ＣＯ２激光器作光源，考察了激发频率、激光强度、脉冲次数和脉冲间隔等激光参数对甲醇激光分解反应性能的影响规律。结果表明：甲醇的激光表面反应具有频率选择性，激发频率不同，甲醇分解率也不同；不同表面上激发次数影响规律不同，随着激发次数增加，甲醇转化率增加；脉冲间隔的改变只影响转化率，脉冲间隔越小，能量利用率越高，甲醇分解率越高；激光强度的提高可增加甲     

Water／Oil Biphasic Hydroformylation of Higher Olefins over a TPPTS-Rh／SiO2 Catalyst

A novel TPPTS-Rh/SiO2 catalyst, prepared by directly modifying a heterogeneous high-surface-area Rh/SiO2 catalyst with water-soluble TPPTS ligands, could decrease the resistance of masstransfer in water/oil biphasic media for the hydroformylation of higher olefins. The catalytic performancefor hydroformylation on this biphasic TPPTS-Rh/SiO2 catalyst system was higher than those of thetraditional biphasic HRhCO(TPPTS)3 systems, owing to the chemical bonds between the highly dispersedRh metal particles and the TPPTS ligands. The catalyst system is applicable for hydroformylation ofhigher olefins such as 1-dodecene.     

室温制备高合金化Pt-Ru/CMK-3催化剂及其对甲醇的电催化氧化

通过低温络合反应制备了高分散高合金化的Pt-Ru固溶体, 并将其均匀地担载在有序介孔碳CMK-3上, 以形成二元复合金属催化剂. XRD谱图表明,fcc结构的Pt原子部分被hcp结构的Ru原子取代形成置换固溶体， 而且几乎没有未形成合金的Ru存在. TEM和XRD研究结果表明， Pt-Ru/CMK-3催化剂中Pt-Ru合金粒子的平均粒径为27 nm, 且具有良好的均一度. 还研究了催化剂对甲醇的电催化氧化性能, 并与E-TEK公司同类催化剂进行了对比, 研究结果表明, Pt-Ru/CMK-3催化剂具有较大的电化学活性面积, 对甲醇的电催化氧化性能和抗CO中毒能力明显优于其它同类催化剂.     

The Self-catalytic Esterification Reaction of O-Phosphoryl Serine Derivative

O-Phosphoryl serine derivative can perform serf-catalytic esterification reaction in the mixture of CH3OH and CHCl3 at the room temperature. The phosphoryl group participation was the key step of the esterification. This type of reactions were proposed through an intermediate of mixed phosphoric-carboxylic anhydride that might provide a clue to the function of the phosphoryl group in the phosphorylated enzymes and in the prebiotic synthesis of protein.     

A New Biochemical Way for Conversion of CO2 to Methanol via Dehydrogenases Encapsulated in SiO2 Matrix

CO2 is converted to nethanol through an enzymatic approach using formate dehydrogenase(FateDH),formaldehyde dehydrogenase(FaldDH）and alcohol dehydrogenase(ADH)coencapsulated in silica gel prepared by modified sol-gel process as catalysts,TEOS as precursor,NADH as an electron donor.The highest yield of methanol was up to 92.1% under 37℃,pH7.0 and 0.3Mpa.     

微波诱导等离子体离子化检测器的研究：气相色谱法同时测定甲醇…

本文采用带自制的微波诱导等离子体离子化检测（ＧＣ－ＭＩＰＩＤ）的气相色谱，以氩气为载气和工作气体，对甲醇和水的同时测定进行了详细研究。方法灵敏度优于氢火焰离子在和热导池检测器，并且解决了用单一检测器难以同时测定甲醇和水的问题。方法已用于乙醇中甲醇和水的测定。文中还对ＭＩＰＩＤ的离子化机理作了初步的探讨。     

Recent Results on Fast Flow Gas-Phase Partial Oxidation of Lower Alkanes

Recent experimental results and kinetic modeling of fast flow gas-phase oxidation of methane and other lower alkanes to methanol and other oxygenates are discussed,alongside with prospects and possible areas for applications of the processes.     

纳米二氧化锆在甲醇合成催化剂Cu/Ga2O3/ZrO2中的作用

The introduction of mesoporous nanosize zirconia to the catalyst for methanol synthesis dedicates the nanosized catalyst and mesoporous duplicated properties. The catalyst bears the larger surface area, larger mesoporous volume and more uniform diameter, more surface metal atoms and oxygen vacancies than the catalyst prepared with the conventional coprecipitation method. The modification of microstructure and electronic effect could result in the change of the reduced chemical state and decrease of reducuction temperature of copper, donating the higher activity and methanol selectivity to the catalyst. The results of methanol synthesis demonstrate that the Cu^＋ is the optimum active site. Also, the interaction between the copper and zirconia shows the synergistic effect to fulfil the methanol synthesis.