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MECHANISM OF SULFUR POISONING AND REGENERATION METHODS FOR SUPPORTED METAL CATALYSTS Ⅰ. MECHANISM OF SULFUR POISONING OF Pd(Pt)/Al_2O_3.CATALYSTS IN H_2-O_2 REACTION

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分子催化 1990年第S1期4卷 23-32页

作者： Deng Youquan An Lindun(lanzhou institute of chemical {3., chinese academy of sciences, lanzhou, China)

Sulfur poisoning mechanism of Pd（Pt）/Al2O3.catalysts for H2—O2 reaction was studied by means of micro-catalytic reaction chromatograph, TPR, XPS, AES, XRD and IR. The results show that the tolerance of Pd/Al2O3.cat... 详细信息

Sulfur poisoning mechanism of Pd（Pt）/Al2O3./sub> catalysts for H2—O2 reaction was studied by means of micro-catalytic reaction chromatograph, TPR, XPS, AES, XRD and IR. The results show that the tolerance of Pd/Al2O3./sub> catalysts to surfur poisoning is significantly affected by the O2/H2 ratio and enhanced with the increase of the ratio. In″weak″oxidizing atmosphere, the deactivation is swift and irreversible because of the active components, particularly at the surface, being seriously sulfided by S-2. In ″strong″ oxidizing atmosphere, the poisoning caused by S-2 is reversible to great extent owing to the reaction Ms—S/Al2O3./sub>（O2,H2O）/catalyst（Ms（MsO）/Al2O3./sub>-SO3./sub>-H2O）where Ms signifies Pd or Pt on the surface. But, when the sulfate in catalyst is accumulated in large amount, it could cover or block the active sites, which may be an important cause of the catalyst deactivation in addition to the sulfidization of metal components.

关键词： poisoning oxidizing seriously irreversible accumulated sulfur Pt Sulfur appearance latter

SWINANINE　C＆D，TWO　NEW　DITERPENE　ALKALOIDS　FROM　DELPHINIUM　SWINANENSE　VAR　LEPTOPOGON

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chinese chemical Letters 1995年第4期6卷 309-310页

作者： Suo Hing ZHANG Ji HA Qing Yu OU (lanzhou institute of chemical {3., chinese academy of sciences, lanzhou73.000)a: (Department of Biology, lanzhou University, lanzhou 73.000) chinese Acad Sci Lanzhou Inst Chem Phys Lanzhou 730000 Peoples R China lanzhou Univ Dept Biol Lanzhou 730000 Peoples R China

s: Two new diterpene alkaloids named swinanine C and D were isolated from Delphinium swinanense var leptopogon (H. -M. ) W. T. Wang. Their structures were elucidated by means of spectral methods , principally 1H-NHR, ... 详细信息

关键词： VAR LEPTOPOGON SWINANENSE FROM DITERPENE ALKALOIDS DELPHINIUM

Three Novel Eremophilanolides from Ligularia virgaurea ***

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chinese chemical Letters 2004年第12期15卷 1441-1444页

作者： Quan Xiang WU Yan Ping SHI Li YANG State Key Laboratory of Applied Organic Chemistry, lanzhou University, lanzhou 73.000 lanzhou {3. of chemical physics chinese academy of sciences (CAS) lanzhou 73.000 State Key Lab. of Appl. Organ. Chem. Lanzhou University Lanzhou 730000 China lanzhou Inst. of chemical physics Chinese Academy of Sciences (CAS) Lanzhou 730000 China

From the alcoholic extract of the whole plant of Ligularia virgaurea spp. oligocephala,three novel eremophilane sesquiterpene lactones, 6α, 10α-dihydroxy-1-oxoeremophila- 7(11),8(9)-dien-8, 12-olide, 6β, 10α-dihydroxy-1-oxoeremophila-7 (11), 8 (9)-dien-8, 12-olide and10α-diydroxy-1-oxoeremophila-7(11), 8 (9)-dien-8, 12 olide were isolated. Their structure s wereelucidated by various, spectroscopic methods including intensive 2D NMR techniques (COSY,HMQC, HMBC and ~1H-~1H NOESY) and HR-MS.

关键词： Ligularia virgaurea spp oligocephala Compositae sesquiterpene lactones eremophilanolides.

Reaction Chemistry of W-Mn/SiO2 Catalyst for the Oxidative Coupling of Methane

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Journal of Natural Gas Chemistry 2003年第1期12卷 1-9页

作者： Shuben LiState Key Laboratory for Oxo Synthesis and Selective Oxidation, lanzhou institute of chemical {3., chinese academy of sciences, lanzhou 73.000, China Stt. Key Lab. Oxo Synth./Sel. Oxid. Lanzhou Inst. of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China

Reaction chemistry of the OCM reaction on W-Mn/SiO_2 catalyst has beenreviewed in this account. Initial activity and selectivity, stability in a long-term reaction,reaction at elevated pressures and a modelling test in a stainless-steel fluidized-bed reactor showthat W-Mn/SiO_2 has promising performance for the development of an OCM process that directlyproduces ethylene from natural gas. A study on surface catalytic reaction kinetics and used catalyststructure characterization revealed a possible reason why C_2 and CO_x selectivity changed duringthe long-term reaction. Further improvement of the catalyst composition and preparation methodshould be a future direction of study on OCM reaction over W-Mn/SiO_2 catalyst.

关键词： W-Mn/SiO_2 catalyst oxidative coupling of methane elevated pressure methane

The Effect of CaAl2O4 Spinel on Ni/Al2O3.Catalyst for CH4/O2-to-Syngas Reaction

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分子催化 1997年第3期 6-7页

作者： LU Yong LIU Yu SHEN Shikong (lanzhou institute of chemical {3. The chinese academy of sciences lanzhou 73.000)

ＴｈｅＥｆｅｃｔｏｆＣａＡｌ２Ｏ４ＳｐｉｎｅｌｏｎＮｉ／Ａｌ２Ｏ３ＣａｔａｌｙｓｔｆｏｒＣＨ４／Ｏ２－ｔｏ－ＳｙｎｇａｓＲｅａｃｔｉｏｎ１）ＬＵＹｏｎｇＬＩＵＹｕＳＨＥＮＳｈｉｋｏｎｇ（ＬａｎｚｈｏｕＩｎｓｔｉｔｕｔ... 详细信息

ＴｈｅＥｆｅｃｔｏｆＣａＡｌ２Ｏ４ＳｐｉｎｅｌｏｎＮｉ／Ａｌ２Ｏ３ＣａｔａｌｙｓｔｆｏｒＣＨ４／Ｏ２－ｔｏ－ＳｙｎｇａｓＲｅａｃｔｉｏｎ１）ＬＵＹｏｎｇＬＩＵＹｕＳＨＥＮＳｈｉｋｏｎｇ（ＬａｎｚｈｏｕＩｎｓｔｉｔｕｔｅｏｆＣｈｅｍｉｃａｌＰｈｙｓｉｃ...

关键词： Methane Partial oxidation Syngas CaAl 2O 4 spinel Ni catalyst

Dimerization　Constant　Determination　of　6－O－Benzoyl－β－Cyclodextrin　in　Aqueous　Solution．

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chinese chemical Letters 1996年第9期7卷 853-854页

作者： Ai You HAO Lin Hui TONG Yao Hong FU Xia Fei LAO Hou Ming WU (lanzhou institute of chemical {3.,chinese academy of sciences,lanzhou 73.000)(Shanghai institute of Organic Chemistry,chinese academy of sciences,Shanghai 23.03.) College of Chemistry Shandong University Jinan 250100 lanzhou Inst. of chemical physics Chinese Academy of Sciences Lanzhou 730000 Shanghai Inst. of Organic Chemistry Chinese Academy of Sciences Shanghai 230032

Dimerization Constant of 6-O-benzoyl-β-CD,which is insoluble in water,was determined for the first time by a calculation method involving an approximation step as well as a geometric *** calculation method can be app... 详细信息

关键词： Cyclodextrin Aqueous Benzoyl Constant Determination

HPLC of Amino Acids and Oligopeptides by Pre-Column Fluorescence Derivatization with 9-Acridine Formyl Chloride

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chinese chemical Letters 1997年第10期8卷 875-878页

作者： Jin Mao YOU Xin Jun FAN Qing Yu OU(lanzhou institute of chemical {3.. chinese academy of sciences 73.000) lanzhou Inst. of chemical physics Chinese Academy of Sciences 730000 China

A highly sensitive HPLC method for the detection of amino acids and oligopeptides with 9-acridine formyl chloride by pre-column fluorescence derivatization has been developed. Glycine, glycylglycine, histidine, triglycine and glutathione were separated on a reversed-phase C-18 column with methanol-water-triethylamine eluent, derivatization and chromatographic conditions were optimized. The five derivatives were eluted in 28 min with a good reproducibility. Linear range of the calibration graph was 0.08-260 nmol/ml(-1). The relative standard deviations(n=6) are 3. for the five derivatives are 20-40 fmol.

关键词： HPLC of Amino Acids and Oligopeptides by Pre-Column Fluorescence Derivatization with 9-Acridine Formyl Chloride

SYNTHESIS OF A NEW CHIRAL PHOSPHINE FROM DSORBITOL

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chinese chemical Letters 1996年第4期7卷 299-300页

作者： An Lai WANG Xiao Dong WANG Shi Jie LU Hong Xiang FU Han Qing WANG(lanzhou institute of chemical {3.,chinese academy of sciences,lanzhou 73.000) lanzhou Inst. of chemical physics Chinese Academy of Sciences Lanzhou 730000

A new chiral phosphine compound: 1,4:3.6-dianhydro-2-O-p-toluene sulfonyl-5-deoxy-5-diphenylphosphino-L-iditol was synthesized using D-sorbitol as starting material, and characterized by elemental analysis, H-1 NMR, P...

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EFFECT　OF　CATALYST　PRETREATMENT　ON　THE　OXIDATION　OF　CARBON　MONOXIDE　OVER　Au／NiO　CATALYST

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chinese chemical Letters 1995年第4期6卷 345-346页

作者： Zheng Ping HAO Li Dun AN Jun Ling Zhou Hong Li WANG(lanzhou institute of chemical {3., chinese academy of sciences, lanzhou 73.000) chinese Acad Sci Lanzhou Inst Chem Phys Lanzhou 730000 Peoples R China

Au/NiO was prepared by coprecipitation and subjected to various heat and oxygen pretreatment prior to being used to promote carbon monoxide oxidation. The most active catalyst was obtained by heating in oxygen at 3.0℃ before use and can convert CD into CO2 completely at 3.℃. The relative activities of these catalysts depended on the degree of heating and oxygen exposure before use.

关键词： NiO OVER MONOXIDE Au CARBON