Parallel measurements of temperature programmed desorption (TPD) and electrical conductance (TPEC), and IR spectra were used to study the chemical and electrical behavior of TiO_2 subjected to H_2S/SO_2. It is found that TiO_2 interacts chemically with both H_2S and SO_2, whereas Al_2O_3 does not.
Programmed temperature was that the temperature was elevated by 10℃ /min to 300℃ remaining for 10 min at initial temperature of 200℃,using higer pure helium as the carrier gas.
Two types of the solid materials containing polyoxometalates (POMs) including mesoporous Na_4W_(10)O_(32)/TiO_2 (anatase phase) and microporous H_3PW_(12)O_(40)/Ta_2O_5 (amorphous) were prepared by the sol-gel and programmed temperature hydrothermal treatment.
The anatase phase, nanosized Na_4W_(10)O_(32)/TiO_2 composite was prepared by a sol-gel technique coupled with programmed temperature hydrothermal treatment.
The reaction solutions passed over the Pd/Al2O3 and Pt/Al2O3 catalyst beds could be well separated by GC with a HP-1 10m capillary column under programmed temperature. Furthermore, the catalyst activity and selectivity as well as the content of TMHQ in the solid product could be calculated by the area normalization method.
Results The 11 kinds of organic phosphorus have been well separated in the HP-5 capillary column(30 m×0.32mm×0.25 μm),when temperature programming was used.
Temperature-programmed carbonization (TPC) was employed to study carboni- zation processes of Fe, Fe/K, Fe/Cu and Fe/Cu/K catalysts in syngas(H_2/CO=2.1).
The decarbonylation of alumina supported[Pt_3(CO)_6]_5[N(C_2H_5)_4]_2 complex was investigated by infrared spectroscopy(IR),and temperature-programmed decomposition(TPDE)combined with mass spectroscopy(MS)(TPDE-MS).
Ce0.35Zr0.55La0.10O1.95 solid solution was prepared by coprecipitation technique and characterized by specific surface area measurements (BET), X-ray diffraction (XRD), and temperature-programmed (TP) technique.
The results show that the conditions of 40～60 mesh of catalyst particle,15 ℃/min of temperature-programmed rate,60 ml/min of flow rate of carrier gas and 0.10 g of filled amount of catalysts are suitable for the NH_3-TPD experiment.
The decarbonylation and the structure transformation of surface Pt3(CO)3(PPh3)4 complex supported on Al2O3 and TiO2 in vacuum or in CO were studied by electron spin resonance (ESR), UV-diffuse reflectance spectroscopy (DRS), infrared spectroscopy, and temperature-programmed decomposition (TPDE).
Silica-supported cobalt catalysts were prepared by sol-gel and impregnation methods and characterized by BET measurements, temperature programmed reduction (TPRH2), X-ray diffraction (XRD), and thermogravimetry-mass spectroscopy (TG-DTA-MS).
Thermodynamic characteristics can be used both to compare and evaluate column quality and to predict retention indices for different temperatures and linear programmed temperature conditions.
Separation of perhalogenated compounds resulting from thermolysis, photolysis or radiolysis of mixtures of halogens in carbon tetrachloride was carried out by programmed temperature gas chromatography.
The extension of retention indices to programmed temperature gas chromatography (PTGC) depends on the linearity between retention temperature and carbon number.
Such variations in relative peak areas were detected on the same instrument on a comparison between data obtained under isothermal conditions and with temperature programming.
Such variations in relative peak areas were detected on the same instrument on a comparison between data obtained under isothermal conditions and with temperature programming.
An overview of the existing methods for minimization of the analysis time in gas chromatography (GC) is presented and a new system for fast temperature programming and very fast cooling down is evaluated.
Suitable temperature programming of the pre-column allows a transfer of the compounds to the inlet of the capillary column for their subsequent analysis.
The gas chromatographic separation is carried out with 10% UCCW 982 on Chromosorb WAW DMCS with N2 as carrier gas and with temperature programming (4°C min-1 100°C up to 280°C).
Pd/Ni bimetallic catalysts were prepared by replacement reactions, characterized by X-ray diffraction, CO chemisorption and H2 temperature-programmed desorption, and evaluated for hydrogenation of cyclohexene, styrene and acetone.
The catalytic activity of the catalysts in removal of NOx, total hydrocarbon (THC) and particulate matter (PM) from diesel exhaust gases were examined in detail using temperature-programmed reaction technique.
The applicability of the proposed algorithm to the control of the sample temperature in the process of temperature-programmed desorption is demonstrated.
The methods of temperature-programmed reaction/desorption (TPR/TPD) are used to study azomethane (CH3N=NCH3) decomposition and the reactions of the products of its pyrolysis (CH3* radicals and N2) on the polycrystalline molybdenum surface.
Angular distributions of H2 desorbing from the surface of polycrystalline iridium are studied by temperature-programmed desorption with spatial resolution.
程序升温
temperature programmed
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