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【期刊论文】Epoxidation of propylene using supported titanium silicalite catalysts
李钢, Gang Li*, Xiangsheng Wang, Haisheng Yan, Yihui Liu, Xuewu Liu
Applied Catalysis A: General 236 (2002) 1-7,-0001,():
-1年11月30日
The propylene epoxidation using supported titanium silicalite TS-1 catalyst was systematically investigated in a fixed bed reactor. Different supports such as SiO2 and Al2O3 were used and two molding methods were adopted to prepare the catalyst. Strip TS-1 catalyst of 1mm
Propylene, Epoxidation, Titanium silicalite, TS-1, Supported catalyst
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李钢, 王祥生, 闫海生, 刘民, 刘毅慧, 陈永英
催化学报,2001,22(5):465~468,-0001,():
-1年11月30日
以四丙基溴化铵为模板剂,以硅溶胶为硅源,采用水热合成法制备了不同铝杂质含量的钛硅分子筛,并系统考察了铝杂质对钛硅分子筛性能的影响。结果表明,原料中的铝杂质可促进钛硅分子筛晶化,但同时也引入了酸性中心;在丙烯环氧化反应中,铝杂质形成的酸性中心会催化环氧丙烷与溶剂的副反应;加入少量碱性添加物可抑制铝杂质的酸催化作用,提高环氧丙烷的选择性,但过量碱性添加物会使钛硅分子筛失活。
钛硅分子筛, 铝杂质, 丙烯, 环氧化, 环氧丙烷, 丙二醇单甲醚, 丙二醇
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李钢, 王祥生, , 金长子, 李桂民
催化学报,2004,25(4):315~318,-0001,():
-1年11月30日
以十二胺(DDA)为模板剂,采用室温晶化合成了钛硅中孔分子筛Ti2HMS,并用XRD,IR,UV2Vis和N2吸附对分子筛 样品进行了表征,考察了配料硅/钛比、模板剂用量及晶化时间对合成分子筛的影响,结果表明,Ti2HMS分子筛具有大的比表面,孔径约为3nm。随着配料硅/钛比的降低,Ti2HMS分子筛的比表面积减小,进入骨架的钛量增多,且非骨架钛也增多。n(DDA)/n(SiO2)≤0122时,随着模板剂用量的减少,Ti2HMS分子筛的结晶度下降,骨架钛含量减少,非骨架钛含量增加。晶化时间在9~18h最佳。
钛硅分子筛, Ti2HMS分子筛, 合成, 表征, 十二胺
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【期刊论文】EFFECT OF SOLVENTS ON PROPENE EPOXIDATION CATALYZED BY TITANIUM SILICALITE
李钢, Gang Li a*, Jiwen Meng a, Xiangsheng Wang a, b and Xinwen Guo a, b
React. Kinet. Catal. Lett. Vol. 82, No.1, 73-80 (2004),-0001,():
-1年11月30日
Titanium silicalite was prepared using tetrapropylammonium bromide as a template. Propene epoxidation was studied on this catalyst using the mixtures of methanol with water or 2-propanol or acetone and the solvent effect was investigated systematically.
Propene, epoxidation, titanium silicalite, solvent effect
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【期刊论文】Titanium species in titanium silicalite TS-1 prepared by hydrothermal method
李钢, Gang Li a, *, Xiangsheng Wang a, Xinwen Guo a, Song Liu a, Qi Zhao b, Xinhe Bao b, Liwu Lin b
Materials Chemistry and Physics 71 (2001) 195-201,-0001,():
-1年11月30日
The titanium species existing in titanium silicalite TS-1, which is prepared by hydrothermal method, were investigated using chemical analysis, XRD, FT-IR, 29Si MAS NMR, UV-VIS, ESR. It has been observed that several kinds of titanium species may exist in titanium silicalite. The form that titanium atoms incorporate into the framework of titanium silicalite synthesized using etrapropylammonium bromide (TPABr) as template differs from that using the classical method. But, the symmetry of titanium silicalite changes from monoclinic to orthorhombic with the increase of titanium content in both methods. The Ti-O2-originated from framework titanium and H2O2 has the moderate stability and may be active site in oxidation reaction. TS-1 synthesized using TPABr as template does not contain anatase, but contains a kind of partly condensed titanium species with six-fold coordination. The titanium species may correspond to 270-280 nm band in UV-VIS spectra and also can form Ti-O2-. But, this kind of Ti-O2-is very stable and cannot be catalytic active site. So, the six-fold coordination titanium species may be inactive in both the oxidation reaction and the decomposition of H2O2. The hypothesis has been further proved by the phenomena that the titanium species is easily washed off using acid, and acid treating will not influence the catalytic performance of TS-1.
Titanium silicalite, TS-1 zeolite, Titanium species, UV-VIS spectra, ESR
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