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1.
研究了氧化铜的加入对锆铈复合氧化物的结构与性能的影响 ,发现氧化铜的加入可降低氧化铈的还原温度 ,稳定复合氧化物的立方结构 ,提高对CO氧化的催化活性。增加铈含量能提高催化剂的活性 ,而硫酸盐等可使催化剂的活性降低。掺铜锆铈复合氧化物催化剂的活性几乎不受高温灼烧的影响 ,是一种具有较高热稳定性的催化剂。  相似文献   

2.
为进一步提高铈锆固溶体储放氧性能,增强乙苯二氧化碳氧化脱氢反应性能,采用共沉淀法合成出氧化铝质量比为50%的铈锆铝氧化物催化剂。通过现代仪器分析表征技术,研究了Al加入对铈锆固溶体复合氧化物晶体结构、储放氧能力的影响。结果表明,Al的加入可起到"扩散阻碍"作用,且有效抑制铈锆固溶体晶粒长大,使得铈锆铝氧化物催化剂比表面积较铈锆固溶体增加了51.8 m~2/g,储放氧性OSC值提高了69.4μmol/g,将铈锆铝氧化物催化剂用在乙苯氧化脱氢5 h反应中,发现乙苯转化率提高了10%。  相似文献   

3.
采用共沉淀法、均相沉淀法以及反相微乳法制备了铈锆复合氧化物.通过XRD,TEM,BET等表征手段来分析所得铈锆氧化物粉体的性质,将制得的粉体涂覆在堇青石蜂窝陶瓷载体上作为涂层,担载一定量的贵金属Pt作为活性组分制得整体催化剂,并在低温水汽变换反应上考察它们的催化性能.分析结果表明3种方法都得到了单相的铈锆固溶体;微乳法制得的纳米级铈锆固溶体粒径分布均匀、平均粒径尺寸为6 nm;所得纳米级铈锆复合氧化物的比表面积大小为微乳法>均相沉淀法>共沉淀法.实验结果表明用微乳法制得的铈锆复合氧化物的催化性能要优于其他两种方法.  相似文献   

4.
合成了Cu/Al原子比分别为2.0、3.1、4.1的CuAl类水滑石样品,焙烧得到CuAl复合氧化物。在Cu/Al原子比为3.1的CuAl氧化物表面浸渍碱金属盐溶液,制备改性CuAl复合氧化物,用AES、XRD、FT-IR、BET、H2-TPR、XPS等技术对催化剂进行了结构表征,考察了CuAl复合氧化物组成、碱金属助剂类型和K的前驱物对改性催化剂在有氧气氛中催化分解N2O活性的影响。结果表明,Na、K、Cs改性CuAl复合氧化物均提高了催化剂活性,但K助剂的增强效应最显著;钾的不同前驱物改性CuAl复合氧化物的催化活性有显著差异,加入碳酸钾、草酸钾提高了催化剂的活性,而加入醋酸钾、硝酸钾反而降低了催化剂活性。优化出的K改性CuAl复合氧化物催化剂在含氧含水气氛的N2O分解反应中表现出了较高的活性。  相似文献   

5.
用于丁烷选择氧化制顺酐的铈锆复合钒磷氧催化剂的研究   总被引:2,自引:2,他引:2  
 在钒磷氧(VPO)催化剂中添加适量铈锆复合氧化物,得到了一\r\n种新型的铈锆复合钒磷氧催化剂.该催化剂对丁烷选择性氧化制顺酐反\r\n应的催化性能比纯VPO催化剂有了显著提高.在丁烷/空气共进料反应\r\n条件下,其顺酐收率比纯VPO催化剂提高了一倍;在无氧反应条件下,\r\n其可参与选择性氧化制顺酐的晶格氧量为纯VPO催化剂的2.2倍.BET比\r\n表面积测试、X射线衍射、钒平均价态测定和程序升温实验等表征结果\r\n表明,混合在催化剂活性相中的少量铈锆复合氧化物参与了VPO体系的\r\n氧化还原过程,并起到了以下两方面的作用:(1)促进了(VO)2P2O\r\n7相的形成,稳定了钒的平均价态,有利于最终形成晶相结构良好和反\r\n应性能稳定的VPO催化剂;(2)显著提高了VPO催化剂的氧化还原性能\r\n,大大增加了催化剂的可逆储氧量.  相似文献   

6.
正丁烷氧化制顺酐Ce基复合氧化物VPO催化剂研制   总被引:3,自引:0,他引:3  
张丰胜  杨廷录 《分子催化》2000,14(4):260-264
在用共沉淀方法制备的Ce-Fe复合氧化物中,加入VPO化剂制备复合VPO催化剂;井测试结构、氧化还原性能以及催化性能。实验结果表明,Ce-Fe复合氧化物的组成和数量均对复合VPO催化剂的结构产生较大的影响,Ce-Fe复合氧化物的加入,提高了复合VPO催化剂表面低温氧物种的活性,降低了品格氧物种的TPR出峰温度,无论在有无气相氧条件下,复合VPO催化剂的晶格氧均有良好的反应催化性能。  相似文献   

7.
制备了铈锆及含有氧化钇、氧化镧和氧化镨的铈锆复合氧化物,并用XRD和BET手段对新鲜及高温老化后的样品进行了表征.结果表明,制备的样品具有单一的立方晶相,并能耐较高的温度;同时,添加剂能增大铈锆复合氧化物的孔径,提高其耐热性能.  相似文献   

8.
铈锆氧化物固溶体对全钯三效催化剂性能的影响   总被引:23,自引:0,他引:23  
铈锆氧化物固溶体对全钯三效催化剂性能的影响  相似文献   

9.
制备了不同Ni/Al原子比的NiAl类水滑石样品,焙烧获得NiAl复合氧化物,用于N2O分解反应,研究了NiAl复合氧化物组成对催化活性的影响。在活性较高的NiAl复合氧化物表面浸渍碱金属碳酸盐溶液,制备改性NiAl复合氧化物,考察了碱金属类型(Na、K、Cs)和钾前驱物(K2CO3、K2C2O4、CH3COOK、KNO3)对改性催化剂活性的影响。用XRD、ICP-AES、FT-IR、BET、H2-TPR、XPS技术表征了催化剂的组成结构。结果表明,Ni/Al原子比为2.7的NiAl复合氧化物催化活性较高;Na、K、Cs碳酸盐改性NiAl复合氧化物均提高了催化剂活性,其中K的助剂效应最强。钾前驱物对K改性NiAl复合氧化物的催化活性有显著影响,其中碳酸钾、醋酸钾、草酸钾的加入明显提高了改性催化剂的催化活性,而加入硝酸钾反而降低了催化剂活性。  相似文献   

10.
助剂对Co/HMS催化剂结构和F-T合成性能的影响   总被引:2,自引:1,他引:2  
详细研究了钍、锆、锗及铈助剂对钴质量分数为15%的Co/HMS催化剂结构、 F-T合成CO转化率、CO2选择性及烃分布的影响,结果表明:钍能适当提高F-T合成 活性,且低温下具有较强的链增长能力;锆、锗、铈降低了催化剂CO转化率,催化 剂加氢能力变强,导致低碳烃增加较快,汽柴油馏分段减低,相应的链增长能力降 低,并以锰和铈较为明显;XRD,TPR及TG表征表明:锆和铈可提高催化剂Co还原度 ,但F-T合成反应时金属Co易披氧化,反应中金属Co量明显减少,CO转化率降低, 并以铈最为显著;Th助催化剂Co还原度稍有减低,Co分散度高于Co/HMS,且反应 中金属Co较为稳定,Co转化率得以提高;添加Mn助剂后,催化剂难以还原,反应中 活性相金属Co量较小,CO转化率较低.  相似文献   

11.
phase diagrams of KCl-KBO2-K2CO3, K2MoO4-KBO2-K2CO3, and K2WO4-KBO2-K2CO3 ternary systems were studied by a calculation-experimental method and differential thermal analysis (DTA). The coordinates of ternary eutectics were determined to be E 1: 622°C, 8.5 mol % KBO2, 56.5 mol % KCl, and 35 mol % K2CO3; E 2: 710°C, 23 mol % KBO2, 43 mol % K2CO3, and 34 mol % K2MoO4; E 3: 710°C, 23 mol % KBO2, 43 mol % K2CO3, and 34 mol % K2WO4. The specific heats of melting of the eutectics were determined.  相似文献   

12.
Solubility in the Na2Cr2O7-(NH4)2Cr2O7-K2Cr2O7-H2O four-component water-salt system at 25, 50, and 75°C was studied for the first time. Phase field boundaries for individual salts and potassium and ammonium dichromate solid solutions, monovariant lines, and invariant points were determined. Experimental data were used to optimize the looped isohydric process of potassium dichromate preparation involving additional salts.  相似文献   

13.
MMe5(dmpe) (M = Nb or Ta, dmpe = Me2PCH2CH2PMe2) reacts with H2 (500 atm) and dmpe in THF at 60°C to give MH5(dmpe)2? NbH5(dmpe)2 readily reacts with two mol of CO or ethylene (L) to give NbHL2(dmpe)2. The exchange of the hydride ligand with the ethylene protons in NbH(C2H4)2(dmpe)2 is not rapid on the 1H NMR time scale (60 MHz) at 95°C.  相似文献   

14.
一些具有NASICON型网格结构的固体电解质具有高的电导率和好的稳定性,NASICON的意思是Na Super Ionic Conductor[1]。当NaZr2(PO4)3中P5 被Si4 部分取代时便可以得到具有NASICON结构的Na1 xZr2SixP3-xO12体系,其具有高的钠离子电导率。然而有相同结构的Li1 xZr2SixP3-xO12体系的离子电导率却很低,这是因为Li 半径太小,而NASICON三维网格结构的离子通道太大,两者不匹配而使电导率下降[2]。但当LiZr2(PO4)3中Zr4 被离子半径小些的Ti4 取代,所得LiTi2(PO4)3的通道就与Li 半径相匹配,适合于锂离子的迁移,从而使其电导率…  相似文献   

15.
The phase diagrams of the NaBO2-NaCl-Na2CO3, NaBO2-Na2CO3-Na2MoO4, NaBO2- Na2CO3-Na2WO4, and NaBO2-NaCl-Na2WO4 ternary systems were studied by a calculation-experimental method and differential thermal analysis. The coordinates of ternary eutectics were determined: E 1: 612°C, 16 mol % NaBO2, 42 mol % NaCl, and 42 mol % Na2CO3; E 2: 568°C, 12 mol % NaBO2, 28 mol % Na2CO3, and 60 mol % Na2MoO4; E 3: 575°C, 12 mol % NaBO2, 32 mol % Na2CO3, and 56 mol % Na2WO4; E 4: 628°C, 8 mol % NaBO2, 20 mol % NaCl, and 72 mol % Na2WO4; and E 5: 655°C, 9 mol % NaBO2, 53 mol % NaCl, and 38 mol % Na2WO4.  相似文献   

16.
马修臻  胡斌 《化学通报》2018,81(10):939-943,938
本文用高精度数字式振荡管密度计测定了288K至318K温度范围内Li2SO4 + Na2SO4 + H2O和 Li2SO4 + K2SO4 + H2O三元体系的密度。混合溶液的离子强度范围从0.1到4.5 mol.kg–1,混合溶液中Na2SO4和K2SO4的离子强度分数为0.2,0.4,0.6和0.8。用密度实验值拟合得到了不同温度下Pitzer离子相互作用模型混合参数θV和 ψV,模型的计算值与实验值的偏差在±0.002 g.cm3以内。用Pitzer模型计算了不同离子强度下三元体系的混合体积。  相似文献   

17.
The novel, 1D semiconductor (H2NC4H8NCH2CH2NH2)(HNCH2CH2NH2)3Zn2Ge2Se8 has been synthesized under solvothermal conditions using N-(2-aminoethyl)piperazine as solvent and templating agent at 200 °C. The material was characterized by single crystal and powder X-ray diffraction, IR and Raman spectroscopy and thermogravimetric analysis. The compound consists of 1D anionic [Zn2Ge2Se8]4− chains made of alternating edge-shared [ZnSe4] and [GeSe4] tetrahedra that charged balanced by one N-(2-aminoethyl)piperazinium and three piperazinium cations. The optical properties were investigated with solid state UV–Vis/near IR spectroscopy and the results show that the solid is a medium gap semiconductor with an absorption edge at 1.8 eV.  相似文献   

18.
This paper examines the structural changes with temperature and composition in the Sc2Si2O7-Y2Si2O7 system; members of this system are expected to form in the intergranular region of Si3N4 and SiC structural ceramics when sintered with the aid of Y2O3 and Sc2O3 mixtures. A set of different compositions have been synthesized using the sol-gel method to obtain a xerogel, which has been calcined at temperatures between 1300 and 1750 °C during different times. The temperature-composition diagram of the system, obtained from powder XRD data, is dominated by the β-RE2Si2O7 polymorph, with γ-RE2Si2O7 and δ-RE2Si2O7 showing very reduced stability fields. Isotherms at 1300 and 1600 °C have been analysed in detail to evaluate the solid solubility of the components. Although, the XRD data show a complete solid solubility of β-Sc2Si2O7 in β-Y2Si2O7 at 1300 °C, the 29Si MAS-NMR spectra indicate a local structural change at x ca. 1.15 (Sc2−xYxSi2O7) related to the configuration of the Si tetrahedron, which does not affect the long-range order of the β-RE2Si2O7 structure. Finally, it is interesting to note that, although Sc2Si2O7 shows a unique stable polymorph (β), Sc3+ is able to replace Y3+ in γ-Y2Si2O7 in the compositional range 1.86?x?2 (where x is Sc2−xYxSi2O7) as well as in δ-Y2Si2O7 for compositions much closer to the pure Y2Si2O7.  相似文献   

19.
The lithium-ion-conducting inorganic solid electrolytes in the oxide systems Li2O-SiO2-P2O5 and Li2O-TiO2-SiO2-P2O5 were prepared by the solid-state reaction, and the electrolyte pellet made by cold-pressing method had diameter of 13 mm and was about 1 mm thick. Phase identification and surface morphology of the products were carried out by X-ray diffraction and scanning electron microscopy. Ionic conductivity of the pellets was investigated through ac impedance. The results show that the adding of other cations can improve the ionic conductivity of the solid electrolyte, and the sintering temperature and duration can influence the ionic conductivity. The maximum ionic conductivity in the samples is 9.9 × 10−4 S/cm in the Li2O-TiO2-SiO2-P2O5 system. Original Russian Text ? W. Li, M. Wang, Z.H. Li, X.F. Shang, H. Wang, Y.W. Wang, Y.B. Xu, 2007, published in Elektrokhimiya, 2007, Vol. 43, No. 11, pp. 1341–1345.  相似文献   

20.
The Ag2Se-Tl2Se-Bi2Se3 quasi-ternary system (system A) was studied using DTA, X-ray powder diffraction, microstructure examination, and microhardness measurements. TlBiSe2-AgBiSe2, AgTlSe-AgBiSe2, AgTlSe-Bi2Se3, and Tl2Se-AgBiSe2 polytherms, isothermal sections at 500 and 800 K, and liquidus surface projection of system A were constructed. System A is congruently triangulated into the following subordinate triangles: Tl2Se-AgTlSe-Tl9BiSe6 (I), AgTlSe-Tl9BiSe6-TlBiSe2 (II), Ag2Se-AgTlSe-TlBiSe2 (III), Ag2Se-AgBiSe2-TlBiSe2 (IV), and AgBiSe2-TlBiSe2-Bi2Se3 (V). Subsystems I, III, and V are ternary systems with three-phase eutectic equilibrium; system II has a three-phase eutectic, and system IV is characterized by several invariant and monovariant peritectic and eutectic equilibria. Primary crystallization and homogeneity fields were outlined, and the types and coordinates of invariant and monovariant equilibria in system A were determined. A characteristic feature of the title system is an extensive field of solid solutions between high-temperature cubic AgBiSe2 and TlBiSe2 phases; this field lies as a continuous belt along the AgBiSe2-TlBiSe2 quasibinary section and covers about one-fourth of the surface area of the triangular diagram of system A.  相似文献   

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