Selective CO oxidation over promoted Au/γ-Al2O3 catalysts in the presence of CO2 and H2O in the feed

In this work, the effect of promoter type (Mg, Mn, Ce, Co, Fe and Ni) on selective CO oxidation performance of Au/γ-Al₂O₃ was studied with the realistic feed stream containing CO₂ and H₂O. The effects of Au loading, promoter loading, reaction temperature and the feed composition were also investigated. It was found that MgO was the best promoter in the presence of CO₂ and H₂O, and 1.25 wt.% Mg was sufficient for promotion. The CO conversion decreased with the addition of CO₂ while the presence of H₂O had some positive effects.     

γ射线扫描技术在化工装置中的应用

在阐述γ射线扫描技术原理的基础上,综述了γ射线扫描技术在化工装置中的研发和应用情况.目前γ射线扫描技术已经应用于催化裂化装置解吸塔、催化裂化装置分馏塔、甲醇精馏塔、催化裂化装置的外溢管等装置的检测诊断中,实践应用证明:γ射线扫描技术可快速、准确、可靠的诊断精馏塔等装置的运行情况,γ射线扫描技术的应用将为企业生产装置的安...     

五羰基铁雾化-热分解-氧化合成氧化铁纳米粒子

建立了将五羰基铁超声雾化、分段加热分解-氧化及产物收集-修饰一体化的纳米氧化铁合成装置,研究了不同修饰剂对纳米粒子的相组成和形貌的影响。采用XRD、TEM和FTIR对合成的纳米粒子进行了表征。通过在雾化液或收集液中添加不同修饰剂,得到平均粒径11.4～36.5 nm的球形水溶性γ-Fe2O3纳米粒子。     

合成N-乙基哌嗪的催化剂改性研究

采用离子交换法对合成N-乙基哌嗪的催化剂γ-氧化铝进行改性,考察了催化剂制备方法对反应的影响。结果表明,γ-Al2O3在室温下经1.00 mol/L的Cu(NO3)2溶液浸渍48 h,110℃干燥3 h,500℃焙烧6 h,于0.6 MPa压力的反应器内、300℃,氢气还原3 h后具有较好的活性和选择性,可提高N-乙基哌嗪收率和哌嗪转化率。     

Influence of structural parameters on proton insertion in γ-MnO2

The proton insertion/deinsertion behavior of γ-MnO₂ samples of various oxygen contents and various structural parameters has been studied. The analysis of the voltammograms observed during the discharges and charges of the different samples is presented, and leads to a classification of the samples according to their structural parameters. The proton insertion capacities and the cycling properties of the different samples have been compared and correlated to their structural properties.     

在NiO-SiO_2气凝胶催化剂上顺酐液相加氢合成γ-丁内酯

以硝酸镍和正硅酸乙酯为原料 ,采用溶胶 -凝胶超临界流体干燥技术 (Sol-Gel-SCFD)制备了w(Ni) =30 %的NiO -SiO2 气凝胶催化剂。通过TPR、TEM等手段对该催化剂进行了表征并通过正交实验对顺酐液相加氢工艺条件进行了优化选择 ,结果表明 :在气凝胶催化剂中活性组分NiO与载体SiO2 之间存在较强相互作用 ,且二者均为高度分散的纳米粒子。在 180℃ ,6 0MPa压力下反应 8h ,顺酐转化率接近 10 0 %,γ 丁内酯的选择性达 80 16 %。在一定温度范围内升高温度有利于γ 丁内酯的生成。     

4-羟基环孢菌素A衍生物[γHyMeLeu4]CyA生产菌的接合转移

将染色体整合型糖多孢红霉菌表达载体pZMW-tsr转入大肠杆菌ET12567（pUZ8002）;以其作为供体,采用接合转移的方法将硫链丝菌素抗性基因tsr转入4-羟基环孢茼素A衍生物[γHyMeLeu4]CyA生产菌野野村菌CYA4OH。PCR结果表明,tsr基因已经整合到CYA40H基因组上。研究表明pZMW载体能够在稀有放线菌野野村菌中有效表达外源基因。     

CO2-CH4重整NiO／γ-Al2O3催化剂制备方法与其催化性能的关系研究

分别采用自然浸渍法（1#）、超声波浸渍法（2#）、旋转真空浸渍法（3#）和胶体磨循环浸渍法（4#）制备NiO／γ-Al2O3催化剂,对其进行TPR和XRD分析,TPR分析结果表明,四种试样的还原温度均低于800℃,均不存在自由NiO物种;XRD分析结果表明,焙烧后的四种试样均存在NiO和NiAl10O16尖晶石两种晶相。四种试样的CH4／CO2重整反应30h评价实验结果表明,胶体磨循环法所制备的催化剂评价结果最好,其CH4和CO2转化率分别为93．5％和83．5％,n（H2）：n（CO）=0．84：1。     

枝晶间距对镍基单晶合金蠕变性能的影响

为了研究枝晶间距对镍基单晶合金组织与蠕变性能的影响,采用不同抽拉速率制备出两种不同枝晶间距的单晶镍基合金.通过蠕变性能测试及组织形貌观察,研究了枝晶间距对合金成分偏析及蠕变性能的影响.结果表明,随着合金枝晶间距的减小,元素成分偏析程度降低,且在相同热处理条件下,枝晶间距较小的合金具有较好的蠕变性能.合金在稳态蠕变期间的变形机制是位错攀移越过筏状γ′相,而蠕变后期的变形机制是位错在基体中滑移和切入筏状γ′相.蠕变断裂后,在试样不同区域筏状γ′相具有不同的形貌,在远离断口区域,筏状γ′相与应力轴方向垂直,而在近断口区域,筏状γ′相尺寸及扭曲程度均增加.     

Research on Comparison and Evaluation Studies of Several Smoothing Denoising Method Based on γ-ray Spectrum Detector

The extraction of spectral parameters is very difficult because of the limited energy resolution for NaI(TI)[JP] gamma-ray detectors. For statistical fluctuation of radioactivity under complex environment, some smoothing filtering methods are proposed to solve the problem. These methods include adopting method of arithmetic moving average, center of gravity, least squares of polynomial, slide converter of discrete funcion convolution etc. The process of spectrum data is realized, and the results are assessed in H/FWHM(Peak High/Full Width at Half Maximum) and peak area based on the Matlab programming. The results indicate that different methods smoothed spectrum have respective superiority in different ergoregion, but the Gaussian function theory in discrete function convolution slide method is used to filter the complex γ-spectrum on Embedded system platform, and the statistical fluctuation of γ-spectrum is filtered well.