Bimetallic Au-Cu/CeO2 catalyst: Synthesis,structure, and catalytic properties in the CO preferential oxidation

The preparation of bimetallic Au-Cu catalysts via the decomposition of the double complex salt [Au(en)₂]₂[Cu(C₂O₄)₂]₃ · 8H₂O is considered. It is found that this method of preparation allows us to selectively obtain Au_0.4Cu_0.6 solid solution nanoparticles on the surface of a support. The composition of the particles corresponds to the stoichiometry of the double complex salt. The properties of bimetallic Au-Cu/CeO₂ catalyst and monometallic Au/CeO₂ and Cu/CeO₂ catalysts were studied during the preferential oxidation of CO in a mixture containing CO₂ and H₂O. The experiments were performed in a catalytic flow system within a temperature range of 50–250°C with a mixture of the following composition, vol %: CO, 1; O₂, 0.6; H₂O, 10; CO₂, 20; H₂, 60; and the balance, He. The weight hourly space velocity (WHSV) was 276000 cm³/(g h). The bimetallic catalyst made it possible to oxidize a considerably larger amount of CO with higher selectivity with CO₂ and H₂O in the mixture, relative to the monometallic catalysts. The preferential oxidation of carbon monoxide in the presence of hydrogen is a promising method for the deep purification of hydrogen-containing gas mixtures in order to remove carbon monoxide. The purified hydrogen-containing gas can be used to feed portable power units based on low-temperature proton-exchange membrane fuel cells, for the synthesis of ammonia, and for hydrogenation in fine organic synthesis.     

大容量生物样品快速灰化装置研制及初步验证

为满足辐射环境监测中对大量生物样品快速灰化的要求,研制了一台大容量生物样品快速灰化装置。该装置由灰化室、通排风系统和自动控制系统三部分组成,其中灰化室是关键部件。装置采用微波加热方式,微波源为输出功率达3.2kW的磁控管组。灰化室体积为18L,可一次处理公斤级的生物样品。装置采用在惰性气氛和氧气氛下分阶段炭化和灰化的灰化方式,通过调节灰化程序实现了炭化、灰化在同一装置中完成。与传统马弗炉法相比,初步验证实验表明,采用该装置的灰化技术能大大缩短灰化时间,适合于快速灰化大量生物样品。     

麦草木素的化学结构及其热化学特性

分别采用常规磨木木素（MWL）分离法和作者提出的酶解／温和酸解木素（EAL）分离新技术对麦草木素进行了分离，并利用定量^31P-NMR、木素衍生化后再还原降解（DFRC）等技术较深人研究了分离得到的麦草木素官能团含量、β芳基醚键的特性与含量、DBDO（dibenzodioxocins）结构等特性。同时，采用热重分析法初步评价了麦草MWL木素、EAL木素、工业碱木素（TAL）的热解特性。结果表明，EAL木素具有得率与纯度高、分离方法简便，更能较好地代表草类纤维细胞中的木素的优点。EAL木素大分子中总β芳基醚键数量为0．811mmol／L，主要是由愈创木基和紫丁香基单元上的酚羟基形成。麦草木素中存在3种DBDO新型结构，含量为0．244mmol／L。MWL和EAL木素的静态热解特性基本相同，而TAL木素与两者相比有较大差异。     

特高含水整装油田不同级次水驱带划分标准与体积计算方法

胜利油区主力整装油田经过长期注水开发,已进入注水开发后期,其综合含水率超过98%,但采收率仅为41%,仍具有较大剩余油储量和提高采收率潜力。通过对胜利整装油田取心井岩心分析,发现各整装油田特高含水期均出现了剩余油饱和度小于残余油饱和度的极端水洗井段,同时也存在含油饱和度大于水驱前缘含油饱和度的弱水驱井段。提出了特高含水储层极端水洗带、强水淹带和弱水驱带的定义和划分标准。研究注入量、驱替速度和渗透率等因素对极端水洗带形成的影响,结果表明,随着注入量的增加,注入水优先突破的区域中,含油饱和度逐步降低、水相渗透率逐步增大、注水分流量逐步提高、驱替速度逐步上升,导致该区域剩余油饱和度低于残余油饱和度,从而形成极端水洗带。建立了不同级次水驱带体积计算方法,并用孤东、孤岛和埕东3个整装油田生产动态数据进行了验证计算,证明所建立的方法是科学、准确的,且具有需要数据易得和计算简单的优势。     

System for Measuring the Beam Position in a Racetrack Microtron-Recuperator

The system described is intended for studying the positions (at 29 points) of the beam trajectory where electrostatic pickups are placed as sensors. The frequency of particle injection into the microtron-recuperator can vary from 20 kHz to 22.5 MHz with 1-nsec bunches. The system makes it possible to measure the position of the accelerated and delayed beams which are both present in the resonator gap. The measurement method is based on simultaneous measurement of the amplitudes of the pulsed signals from four pickup plates using a fast ADC.     

电力SCADA仿真系统

给出了一种电力SCADA仿真系统及其实现方法。该系统在生产实践的仿真培训方面具有很好的应用前景和优势。     

在酸性介质中聚苯硫醚对钯的吸附行为

研究了聚苯醚硫（ＰＰＳ）在硝酸、硫酸和盐酸介质中对贵金属钯的吸附行为及振荡吸附时间、酸度、钯浓度对吸附的影响。结果表明：在不同的酸介质中ＰＰＳ对钯均有一定量的吸附，其饱和吸附容量可达１０．７８±１．０９ｍｇ／ｇ树脂，且有很好的吸附选择性，还探索了解吸剂及从混合离子溶液中回收钯的途径。