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在Bi2O3-MoO3复合氧化物催化剂中加入Yb2O3,可明显提高异丁烯转化率和生成甲基丙烯醛的选择性,用XRD、FT-Raman光谱和SEM技术研究了催化剂的组成和性质,Bi2O3—MoO3催化剂的成分主要是α-Bi2Mo3O12,添加镱后出现了Yb2Mo3O12的吸收峰;且Bi2O3-MoO3-Yb2O3催化剂的FT—Raman光谱图在363cm^-1处出现了Yb—O伸缩振动峰,同时既Bi2O3-MoO3催化剂的铝-氧振动发生红移,表明镱的加入使铝-氧键的振动减弱,使Bi2O3-MoO3-Yb2O3催化剂有较高传递晶格氧给予异丁烯的能力,导致异丁烯转化率和生成甲基丙烯醛的选择性均显著提高。 相似文献
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A Cd(II)-nitronyl nitroxide radical complex with dicyanoaurate(I) bridges [Cd(NIT4Py)2][Au(CN)2]2, was synthesized and characterized by elemental analyses, IR spectrum and X-ray diffraction single-crystal structure analysis. Crystal data for the complex: triclinic, space group P1, a=0.720 9(11) nm, b=0.960 3(15) nm, c=1.284(2) nm, α=75.38(2)°, β=85.46(2)°, γ=68.38(2)°, V=0.800(2) nm3, Z=1, and R1 [I>2σ(I)]=0.055 8. The title complex consists of infinite one-dimensional chains of [Cd(NIT4Py)2][Au(CN)2]2, in which [Cd(NIT4Py)2] moieties are conne-cted by [Au(CN)2]- μ2-bridging ligands. Each cadmium(II) ion is six-coordinated in a distorted and centrosymmetric octahedral environment. CCDC: 258357. 相似文献
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A novel one-dimensional (1D) Cu(Ⅱ) nitronyl nitroxide complex bridged by iminodiacetate dianion [Cu(NIT4Py)(IDA)]n,where NIT4Py=2-(4'-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide and IDA= iminodiacetate dianion,was synthesized and structurally characterized by X-ray diffraction. It crystallizes in monoclinic,space group P21/c with a=0.921 09(10) nm,b=0.780 09(9) nm,c=2.486 3(3) nm,β=96.826(2)°. The Cu(Ⅱ) ion is five-coordinated with a distorted square-pyramidal geometry. Each iminodiacetate dianion bridges two Cu(Ⅱ) ions via a monodentate-tridentate mode into a 1D chain,and these 1D chains are further linked into a 2D network via hydrogen-bonding interactions. 相似文献
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氮氧自由基单核钬配合物的合成与结构 总被引:1,自引:0,他引:1
A novel mononuclear Ho(Ⅲ) nitronyl nitroxide complex [Ho(hfac)3(NITPhDma)2], (NITPhDma=2-(4-dimethylamino-phenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, hfac=hexafluoroacetylacetonate), was synth-esized and structurally characterized by X-ray diffraction. It crystallizes in monoclinic, space group P21/n with a=1.274 5(1) nm, b=1.753 1(2) nm, c=2.482 8(2) nm, β=93.753(2)°. The Ho(Ⅲ) ion is eight-coordinated with a distorted dodecahedron environment. Each NITPhDma radical acts as monodentate ligand towards Ho(Ⅲ) ion through the NO group, and the complex molecules are well isolated. CCDC: 775839. 相似文献
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添加Tm对VPO催化剂性能的影响 总被引:2,自引:0,他引:2
八十年代以来,以正丁烷为原料生产顺酐的磷钒系催化剂研究非常活跃.为改进催化剂的性能,可添加Zn、Co、Zr、Ti等过渡元素[1-3],但有关催化剂的组成、结构及作用机理方面的报导较少.我们在VPO催化剂中分别加入十五种稀土元素并将其应用于正丁烷选择氧化制备顺酐的反应中[4].实验结果表明,以添加Tm的催化剂活性及选择性均为最高.本文用IR、XRD、XPS、和NH3-TPD等方法研究了VPO和添加Tm后样品的晶相结构、表面组成和酸性,用固定床反应器考察了正丁烷转化率和生成顺酐选择性的变化并探讨了引起这些变化的机理.1实验(… 相似文献
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