Co助剂对MoO_3／TiO_2─Al_2O_3加氢脱硫催化剂性能影响研究

本文利用中压（３．ＯＭＰａ）固定床流动反应装置研究了不同Ｃｏ含量对ＭｏＯ３／ＴｉＯ２─Ａｌ２Ｏ３催化剂加氢脱硫性能的影响．结果表明，少量Ｃｏ助剂的引入可显著提高催化剂的加氢脱硫活性，但对加氢活性影响较小．Ｃｏ／Ｃｏ＋Ｍｏ原子比在０．２５～０．４５范围内催化活性最高．     

TiO_2调变对催化剂MoO_3/γ-Al_2O_3催化性能的影响

采用气相流动吸附法制ＴｉＯ２／γ－Ａｌ２Ｏ３复合载体，浸渍法担载一定量ＭｏＯ３．用ＸＲＤ，ＴＰＲ方法考察了ＭｏＯ３的分散状态，中压固定床反应装置测定催化剂的噻吩加氢脱硫和环己烯加氢活性．结果表明，ＴｉＯ２的加入能减弱ＭｏＯ３与γ－Ａｌ２Ｏ３间的相互作用，促进ＭｏＯ３的还原，提高催化剂的加氢脱硫活性．     

TiO_2调变对MoO_3/γ-Al_2O_3和CoO-MoO_3/γ-Al_2O_3表面结构及还原性能的影响

采用气相流动吸附法制ＴｉＯ２／γ－Ａｌ２Ｏ３复合载体,浸渍法担载一定量ＭｏＯ３或ＣｏＯ－ＭｏＯ３．用ＸＲＤ,ＬＲＳ和ＴＰＲ等技术考察了Ｍｏ或Ｃｏ－Ｍｏ催化剂的表面结构和还原性能．结果表明,覆盖在γ－Ａｌ２Ｏ３上的ＴｉＯ２能减弱ＭｏＯ３与γ－Ａｌ２Ｏ３之间的相互作用,明显改善Ｍｏ催化剂的表面结构,促进ＭｏＯ３的还原,适量ＣｏＯ助剂的加入能促进ＭｏＯ３在载体表面的分散．     

Mo_2N与CoMo/(TiO_2—Al_2O_3)催化剂加氢脱硫与加氢脱氮催化性能比较

本文在同一条件下分别测试了硫化态的催化剂CoMo/(TiO2—Al_2O_3)及氮化态的Mo_2N催化剂的加氢脱硫和加氢脱氮性能,结果表明,对于噻吩的加氢脱硫反应,硫化态催化剂CoMo/(TiO_2—Al_2O_3)在催化活性及稳定性方面都优于Mo_2N,而Mo_2N在毗啶的加氢脱氮反应中显示了较大优势。     

铜─铬─钼／二氧化硅三元复合加氢催化剂的研究

本文研究了Ｃｕ－Ｃｒ—Ｍｏ／ＳｉＯ２三元复合加氢催化剂的制备工艺和寿命。结果表明Ｃｕ－Ｃｒ—Ｍｏ／ＳｉＯ２三元复合加氢催化剂的制备工艺稳定可靠，切实可行，各元素含量可以控制．在芳香族硝基化合物加氢还原的反应中，本催化剂性能较现在工业上所采用的改性单铜催化剂有较大提高，一次寿命负荷超过单铜５０％以上，最高达１７６％。     

Co基、Ni基、Fe基、Ti基金属间化合物在H_2中的脆化

本文通过测量ＣＯ３Ｔｉ、Ｎｉ３Ａｌ、Ｆｅ３Ａｌ、ＴｉＡｌ四种金属间化合物在氧气、氢气中在２×１０－４／ｓ形变速率下的拉伸性能,研究了其在氢气中的室温环境脆性．研究结果表明,上述四种金属间化合物在Ｈ２中的脆化程度（用氢脆因子ＩＨ２＝［（δＯ２－δＨ２）／δＯ２］×１００％表示）是不同的,其大小依次为Ｃｏ３Ｔｉ＞Ｆｅ３Ａｌ>ＴｉＡｌ.其脆化程度的差异用金属间化合物中基体金属对氢气的催化裂解作用的强弱进行了很好的解释．     

铜-铬-钼-稀土/二氧化硅及铜-稀土/二氧化硅复合加氢催化剂的研究

在本研究中制备了一系列Ｃｕ－Ｃｒ－Ｍｏ－ＲＥ／ＳｉＯ２和Ｃｕ－ＲＥ／ＳｉＯ２催化剂。研究结果表明：在Ｃｕ／ＳｉＯ２催化剂中,引进Ｃｒ、Ｍｏ和稀土氧化物后能显著延长催化剂寿命。这一结果并用ＸＰＳ光谱对催化剂表面及用ＴＧ对催化剂抗结焦性能进行了分析研究结论为：Ｃｕ－Ｃｒ－Ｍｏ－ＲＥ／ＳｉＯ２和Ｃｕ－ＲＥ／ＳｉＯ２催化剂的负荷比Ｃｕ／ＳｉＯ２催化剂显著提高。     

TiCl_4穿透曲线和吹扫曲线的测定研究

以Ｎ２气为载气携带ＴｉＣｌ４通过γ－Ａｌ２Ｏ３床,使ＴｉＣｌ４吸附在γ－Ａｌ２Ｏ３表面上．测定ＴｉＣｌ４的穿透曲线和吹扫曲线,这对研究ＴｉＣｌ４在γ－Ａｌ２Ｏ３表面上的动态吸附行为是很重要的．     

采用常压小型固定床流动反应装置评价催化反应性

本文采用常压小型固定床流动反应装置评价ＮｉＯ／γ－Ａｌ２Ｏ３催化剂在ＣＨ４，ＣＯ２催化反应过程中的催化反应活性．结果表明，在一定反应条件下，一定镍担载量的ＮｉＯ／γ－Ａｌ２Ｏ３催化剂对ＣＨ４，ＣＯ２转化制合成气过程具有良好的催化反应活性．     

γ-Mo_2N的合成及其HDS和HYD性能研究

在较温和条件下ＭｏＯ３与ＮＨ３通过局部规整反应合成不同表面积γ－Ｍｏ２Ｎ．通过合成条件探讨，发现ＭｏＯ３颗粒大小、ＮＨ３的空速以及床层加热速率是决定能否获得大表面积γ－Ｍｏ２Ｎ的关键，且随着γ－Ｍｏ２Ｎ表面积增加，其范围在２～３ｎｍ之间的孔径逐渐增加．γ－Ｍｏ２Ｎ的Ｈ２－ＴＰＤ表征表明存在两个Ｈ２脱附峰：一个为γ－Ｍｏ２Ｎ表面吸附，一个为其次表层及体相吸附．噻吩的ＨＤＳ及环已烯的ＨＹＤ活性被测试，结果表明，高表面γ－Ｍｏ２Ｎ的ＨＤＳ，ＨＹＤ性能优于中、低表面γ－Ｍｏ２Ｎ．     

MoO_3/TiO_2—SiO_2催化剂的阈值效应研究

采用气相流动吸附法制TiO_2/SiO_2复合载体,浸渍法担载一定量MoO_3。用XRD、LRS和TPR等技术考察了MoO_3在TiO_2/SiO_2表面的分散状态,中压固定床反应装置测定MoO_3/TiO_2—SiO_2、MoO_3/SiO_2催化剂的噻吩加氢脱硫、环己烯加氢和苯加氢活性。结果表明:(1)TiO_2的加入有利于加强MoO_3与SiO_2之间的相互作用,促进MoO_3在载体表面的分散,提高其分散阈值:(2)当MoO_3载量低于分散阈值时,其HDS、HYD和BHD活性随MoO_3载量的增加而明显增大,但在高于分散阈值后,几乎保持不变,能明显体现负载型Mo催化剂在HDS、HYD和BHD反应中的阈值效应;(3)MoO_3/TiO_2—SiO_2催化剂的HDS、HYD和BHD活性都较MoO_3/SiO_2催化剂高,TiO_2能很大程度地改善MoO_3/SiO_2催化剂的HDS、HYD活性。     

氮化钼上肉桂醛的选择加氢

本文研究了Mo2N和Mo2N/Al2O3上肉桂醛选择加氢反应特性,并与Co/Al2O3进行了比较.结果表明,影响肉桂醛加氢的主要因素是肉桂醛在催化剂上的吸附和反应物的使用时间.使用新鲜原料时,Mo2N/Al2O3与Co/Al2O3上肉桂醛选择加氢反应性能相当,具有很高的C=O键加氢选择性.423K时,在反应原料使用较长时间后,由于吸收空气中的氧,反应过程中使Mo2N催化剂表面氧化而使其丧失C=O键选择加氢能力.     

TiO2／Cu2O可见光下光催化降解酸性大红的研究

制备了在可见光照射下具有较高催化活性的系列TiO2/Cu2O光催化剂,并用其在可见光下光催化降解酸性大红.研究了TiO2含量和H2O2对光催化反应的影响.结果表明5%TiO2/Cu2O的光催化活性曩好,在加入少量的H2O2情况下酸性大红的脱色率可达到86%,化学需氧量(CODcr)去除率达到65%.     

Influence of Calcination Temperature on TiO2 Nanotubes' Catalysis for TiO2/UV/O3 in Landfill Leachate Solution

The influence of calcination temperature on TiO2 nanotubes' catalysis for TiO2/UV/O3 was investigated. TiO2 nanotubes (TNTs) were prepared via the sol-gel method and calcined at 300-700℃, which were labeled as TNTs-300, TNTs-400, TNTs-500, TNTs-600 and TNTs-700, respectively. TNTs were characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). It is found that TNTs calcined at 400 ℃ showed the best thermal stability. When the calcination temperature increased from 400 ℃ to 700 ℃, the special structure of tubes was destroyed and gradually converted into nanorods and/or particles. The transformation from anatase to rutile occurred at 600 ℃, and the rutile phase was enhanced when the calcination temperature was increased to over 600 ℃. The calcina-tion temperature's influence on TNTs' adsorption activity for chemical oxygen demand (COD) and catalytic activity for TiO2/UV/O3 was investigated in landfill leachate solution. In landfill leachate solution, the adsorption activity of COD decreased in the reduced order of TNTs-300, TNTs-400, TNTs-500, TNTs-600 and TNTs-700. In photocatalytic ozonation, TNTs-400 showed the best catalytic activity while TNTs-700 exhibited the worst. In other three processes, the COD removal of TNTs-300/UV/O3 was higher than those of TNTs-500/UV/O3 and TNTs-600/UV/O3 in the first 20 min, and then became close to those of the latter two in the following 40 min. Compared with TNTs-300 and TNTs-400, TNTs-600 had the best anti-fouling activity, while TNTs-500 and TNTs-700 had lower anti-fouling activity than the former three. In photocatalytic ozonation, the calcination temperature of 400 ℃ was appropriate when TNTs were obtained at the synthesis temperature of 105 ℃.     

Mo掺杂纳米TiO_2光降解甲基橙的动力学模型

通过溶胶-凝胶法制备了Mo不同掺杂量的纳米TiO2光催化剂,进行了UV-Vis分析,并在紫外光源下对降解甲基橙光催化活性进行了测定.最后建立L-H模型和GM(1,1)模型,考查了Mo/TiO2对甲基橙的降解动力学,并对模型进行了比较.结果表明,纳米TiO2当煅烧温度为500℃时,Mo的最佳掺杂量为0.05 mol%.L-H模型对有些Mo掺杂纳米TiO2光催化降解甲基橙存在偏差,且Andrews型稳健回归优于最小二乘算法的模拟结果.而GM(1,1)模型对Mo掺杂纳米TiO2光催化降解甲基橙能进行很好的实验模拟.     

可见光响应的掺杂型纳米TiO2制备及其光催化活性研究

在通过溶胶-凝胶法制备出铜和氮共掺杂的纳米二氧化钛(TiO2)的基础上,利用XRD和UV-Vis光谱等技术对其结构、掺杂效果、光催化活性等进行了表征,结果表明,掺入了铜和氮的纳米TiO2结构为锐钛矿晶型,其吸收阈值达到590nm,可见光吸收率比未掺杂的纳米TiO2有了很大提高,最终导致其光催化降解二甲酚橙的活性得到显著增强.     

CaO+SiO2+Al2O3+MgO+FeO五元渣系中FeO活度的研究

Activities of FeO in CaO-SiO2-Al2O3-MgO-FeO slags were determined at 1673 K by electrochemical measurements of the solid electrolyte cell: Mo |Mo MoO2[ZrO2(MgO)[Fe (CaO-SiO2-Al2O3-MgO-FeO) Ag|Fe. The influences of slag compositions and basicity on FeO activities were analyzed. The results reveal that, for slags of fixed (?O)/(%SiO2) ratio, MgO and Al2O3 content, there was an increase of FeO activities with increase of FeO content. For slags with constant {(?O) (%MgO)}/(%SiO2) ratio, fixed FeO and Al,2O3 content, FeO activities decreased when MgO content increased from 5% to 10%, and increased with the increase of MgO content when it was over 10%. The FeO activities increased when (?O)/(%SiO2) ratio changed from 1.03 to 1.30 in the slags of constant MgO, FeO and Al2O3 content.     

以胶原纤维为模板合成介孔TiO2-Al2O3二元复合氧化物纤维

以胶原纤维为模板合成了介孔TiO2-Al2O3二元复合氧化物纤维,并利用扫描电镜(SEM)、X射线衍射仪(XRD)、比表面孔隙分析仪、X光电子能谱(XPS)对该二元复合氧化物纤维进行了表征。结果表明所合成的介孔TiO2-Al2O3二元复合氧化物呈纤维状,较好地保留了胶原纤维的结构。当Ti/Al摩尔比为4.88:1时,TiO2-Al2O3二元复合氧化物纤维的平均孔径为7.4 nm,比表面积可达131.0 cm2/g,其中TiO2主要以锐钛矿相存在,Al2O3则以无定形态分散于TiO2晶体间。     

Theoretical study of NO adsorbed on the surface of TiO_2(110) cluster model

INTRODUCTION The adsorption of gas molecules on metals,metal oxides or alloys had been researched widelyto find a solution for the problem of air pollution(Davies and Craig Jr., 2003; Yanagisawa, 1996;Tominaga et al., 1999). NO could be adsorbed onthe particle surface and desorbed as N2 from thesurface by temperature programmed desorption(TPD) (Davies and Craig Jr., 2003; Yanagisawa,1996). The calculation of cluster model was estab-lished with molecular orbital (MO) theory (Ry…