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1. Solubilities of L-Proline in Subcritical HFC-134a and Supercritical CO2 Fluid | |||
LIU Ling,LI Zhen,LIU Zhong-Wen,LIU Zhao-Tie | |||
Chemistry 02 February 2009 | |||
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Abstract:A static method coupled with gravimetric analysis was used to measure the solubility of L-proline in subcritical 1,1,1,2-tetrafluoroethane (HFC-134a) and supercritical CO2(scCO2). The solubility of L-proline is much higher in HFC-134a fluid than in scCO2. The solubilities of L-proline in HFC-134a and scCO2 are affected by temperature and pressure. The solubilities increase with increasing temperature and pressure for both scCO2 and HFC-134a solvents. The densities of scCO2 and subcritical HFC-134a were calculated using the Peng-Robinson (P-R) equation. Experimentally determined density data were used to assess the accuracy of the P-R equation. | |||
TO cite this article:LIU Ling,LI Zhen,LIU Zhong-Wen, et al. Solubilities of L-Proline in Subcritical HFC-134a and Supercritical CO2 Fluid[J].J. Chem. Eng. Data ,2009年,54卷,9期,2780 ~ 2784 |
2. Study on the Pyrolysis of methyl tert-butyl ether (MTBE) with Molecular-Beam Mass Spectrometry and Tunable Synchrotron VUV Photoionization | |||
Taichang Zhang,Wang jing,Yuan Tao,Hong Xin,Zhang Lidong,Fei Qi | |||
Chemistry 06 January 2009 | |||
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Abstract:An experimental study of MTBE pyrolysis (3.72% MTBE in argon) has been performed at low pressure (267 Pa) within the temperature range from 700 to 1420 K. The pyrolysis process was detected with the tunable synchrotron vacuum ultraviolet (VUV) photoionization and molecular-beam mass spectrometry (MBMS). About thirty intermediates are identified from near-threshold measurements of photoionization mass spectrum and photoionization efficiency spectrum. Among them, H2, CO, CH4, CH3OH and C4H8 are the major pyrolysis products. The radicals such as methyl, methoxy, propargyl, allyl, C4H5 and C4H7 are detected. The isomers of pyrolysis products are identified as well, i.e., propyne and allene, 1,2,3-butatriene and vinylacetylene, isobutene and 1-butene, propanal and acetone. Furthermore, the mole fractions of the pyrolysis products have been evaluated under various temperatures. Meanwhile the initial formation temperatures of different pyrolysis products can be obtained. This work is anticipated to present a new experimental method for pyrolysis study, and help understand the pyrolysis and combustion chemistry of MTBE and other oxygenated fuels. | |||
TO cite this article:Taichang Zhang,Wang jing,Yuan Tao, et al. Study on the Pyrolysis of methyl tert-butyl ether (MTBE) with Molecular-Beam Mass Spectrometry and Tunable Synchrotron VUV Photoionization[OL].[ 6 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27379 |
3. Vanadia supported on H2O2-detemplated mesoporous SBA-15 as new effective catalysts for the oxidative dehydrogenation of propane | |||
Xu Jie,Fan Kangnian,Chen Miao,Cao Yong,Liu Yongmei,He Heyong | |||
Chemistry 04 July 2008 | |||
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Abstract:Mesoporous SBA-15(H2O2) material synthesized via a controlled H2O2-based detemplation at mild conditions has been employed as new type of support to load vanadia. The ordered mesostructure of the SBA-15 host is retained as indicated by XRD and nitrogen adsorption measurements, and the surface areas of the V-SBA-15(H2O2) materials are in the range of 464-667 m2g1 comparable to 772 m2g1 for the parent SBA-15(H2O2) material. The characterization results also indicate the presence of a high abundance of surface silanol groups inside the silica pores, which can allow controlled vanadium loading up to 4.5 wt % or V coverage up to 1.01 Vnm2. In contrast with conventional calcination-derived SBA-15(C) sample the high population of the surface hydroxyl groups as well as high structural stability of the SBA-15(H2O2) material allowed a very good dispersion of the vanadia on its surface leading to high productivities of propylene during the oxidative dehydrogenation of propane. | |||
TO cite this article:Xu Jie,Fan Kangnian,Chen Miao, et al. Vanadia supported on H2O2-detemplated mesoporous SBA-15 as new effective catalysts for the oxidative dehydrogenation of propane[OL].[ 4 July 2008] http://en.paper.edu.cn/en_releasepaper/content/22709 |
4. Complex oscillations in the simulation of Ce(Ⅲ)/(Ⅳ) catalyzed BZ reaction | |||
Xiong Xiaogen,Lu Yongchao | |||
Chemistry 05 May 2008 | |||
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Abstract:In this paper we summarize the observation of homogeneous kinetics in the simulation of Ce(Ⅲ)/(Ⅳ) catalyzed BZ reaction in CSTR. Flow rate was set as control parameter and several kinds of complex oscillations were found in this model. When control parameter was decreased, a sequence of transition from steady state to complex oscillations at high flow rate and then from complex oscillations to steady state at low flow rate was found. | |||
TO cite this article:Xiong Xiaogen,Lu Yongchao. Complex oscillations in the simulation of Ce(Ⅲ)/(Ⅳ) catalyzed BZ reaction[OL].[ 5 May 2008] http://en.paper.edu.cn/en_releasepaper/content/21082 |
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