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1. Modified Langmuir equation for predicting type II adsorption isotherms | |||
ZHANG Peikun | |||
Chemical Engineering 07 May 2017 | |||
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Abstract:The Langmuir adsorption isotherm equation is modified to include more parameters for fitting Type II isotherms according the Brunauer classification. Unlike some isotherm equations which have a singularity when pressure equal to saturation vapor pressure, one advantage of the modified Langmuir equation is its validity when the iterative value of adsorbate pressure reaches a value around the saturation vapor pressure in numerical simulation. With four equation constants, the modified Langmuir equation fits the full range of isotherms with high accuracy for water on the adsorbents discussed. | |||
TO cite this article:ZHANG Peikun. Modified Langmuir equation for predicting type II adsorption isotherms[OL].[ 7 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4727248 |
2. Effluence of modification on the deep desulfurization behavior of NaY and Na13X zeolite for thiophene | |||
LIAO Junjie,Liu Yang,Bao Lei,Chang Liping,Bao Weiren | |||
Chemical Engineering 05 August 2016 | |||
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Abstract:NaY and Na13X zeolites were modified by different modification manners, which are H+ modification, metal ion (copper, nickel or cerium ions) modification and H+ modification followed by metal ion modification, to prepare series of sorbents. The properties of these sorbents were measured by XRD, N2 adsorption and SEM/EDS. The desulfurization activity of these sorbents was evaluated in a model gasoline made of thiophene and cyclohexane, and the results were compared to investigate the effect of preparation methods on adsorption desulfurization behavior. The results show that H+ modification or metal ion modification could all improve the desulfurization efficiency of both NaY and Na13X zeolites, however, for Na13X, after modified by copper or nickel ions, its crystal structure was destroyed, and thus the desulfurization efficiency is much lower than before. The desulfurization activity of the sorbents prepared via H+ modification followed by metal ion modification is higher than that of sorbents prepared by single H+ modification or metal ion modification because pre-modification by H+ can increase the metal content, specific surface and pore volume of sorbent in the following metal ion modification process. Compared with Na13X, NaY is more suitable for H+ modification followed by metal ion modification. Among those prepared sorbents, the CuHY sorbent prepared via NaY modified via H+ and followed by copper ion, has the highest desulfurization efficiency at room temperature. | |||
TO cite this article:LIAO Junjie,Liu Yang,Bao Lei, et al. Effluence of modification on the deep desulfurization behavior of NaY and Na13X zeolite for thiophene[OL].[ 5 August 2016] http://en.paper.edu.cn/en_releasepaper/content/4701979 |
3. Effect of ligand-based functionalization on aromatics adsorption and separation in zirconium-based metal-organic frameworks: A computational study | |||
WU Ying,LIU Defei,QIAN Yu,XI Hongxia | |||
Chemical Engineering 04 November 2014 | |||
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Abstract:The adsorption and separation properties of benzene and toluene on the zirconium-based frameworks UiO-66, -67, -68 and their functional analogues UiO-Phe and UiO-Me2 were studied using grand canonical Monte Carlo (GCMC) simulations, density functional theory (DFT) and ideal adsorbed solution theory (IAST). Remarkable higher adsorption uptakes of benzene and toluene at low pressures on UiO-Phe and -Me2 were found compared to their parent framework UiO-67. It can ascribed to the presence of functional groups (aromatic rings and methyl groups) that significantly intensified the adsorption, majorly by reducing the effective pore size and increasing the interaction strength with the adsorbates. While pore volumes and accessible surfaces of the frameworks turned to be the dominant factors governing the adsorption at high pressures. In the case of toluene/benzene separation, toluene selectivities on UiOs showed a two-stage separation behavior at the measured pressure range, resulting from the greater interaction affinities of toluene at low pressures and steric hindrance effects at high pressures. Additionally, the enhanced π delocalization and suitable pore size of UiO-Phe corporately gave rise to the highest toluene selectivity, suggesting the ligand functionalization strategy could reach both high adsorption capacity and separation selectivity from aromatic mixtures at low concentrations. | |||
TO cite this article:WU Ying,LIU Defei,QIAN Yu, et al. Effect of ligand-based functionalization on aromatics adsorption and separation in zirconium-based metal-organic frameworks: A computational study[J]. |
4. One-step photocatalysis-assisted adsorptive desulfurization of diesel over doped-TiO2 under ambient conditions | |||
WANG Xun,XIAO Jing | |||
Chemical Engineering 12 September 2014 | |||
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Abstract:One-pot photocatalysis-assisted adsorptive desulfurization (ADS) of diesel by using bi-functional doped-TiO2 adsorbents with molecular oxygen in air under ambient conditions was developed, which achieved high ADS capacity of 1.89 mg-S/g-Ads. The developed approach provides a new path for ultra-clean fuel production. | |||
TO cite this article:WANG Xun,XIAO Jing. One-step photocatalysis-assisted adsorptive desulfurization of diesel over doped-TiO2 under ambient conditions[OL].[12 September 2014] http://en.paper.edu.cn/en_releasepaper/content/4609616 |
5. Li-doped Copper-based Metal-organic Frameworks for Methanol Adsorption: A computational study | |||
WU Ying,LIU Defei,XI Hongxia | |||
Chemical Engineering 03 September 2014 | |||
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Abstract:GCMC simulations combined with density functional theory (DFT) calculations were performed to evaluate the functionality effect of Li-doping on methanol adsorption over copper-based metal-organic frameworks (MOFs). Compared to the original Cu-BTC, Cu-BTC-Li shows higher methanol capacity and more continuous adsorption behavior in the measured pressure range. It can be attributed to the new adsorption sites (Li-sites) created by Li atoms, which turn to be the first preferential adsorption sites instead of Cu-sites. Li-doping also shows varied effects on methanol adsorption at different pressures. The electrostatic interaction between methanol-framework plays predominant role (with contribution over 95%) in the adsorption at low pressures, and Li-doping enhances adsorption by increasing the electrostatic potential of the framework. Whereas the adsorption is governed by dispersive interactions at high pressures, which can be improved by Li-doping through sterically compressing the adsorption space in the cages.????? | |||
TO cite this article:WU Ying,LIU Defei,XI Hongxia. Li-doped Copper-based Metal-organic Frameworks for Methanol Adsorption: A computational study[J]. |
6. Selective adsorption property of collagen fibre adsorbent for tea polyphenols | |||
Liao Xue-pin,Lu Zhong-bing,Deng Hui, Du Xiao,DU Xiao | |||
Chemical Engineering 04 April 2005 | |||
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Abstract:A novel adsorbent was prepared based on cattle hide collagen fibres. It was found that the collagen fibre adsorbent can selectively adsorb galloylated catechins (EGCG, GCG and ECG) from tea polyphenols (TP) with the extent of adsorption higher than 90%. The extent of adsorption for C, EGC and EC was relatively lower. In case of caffeine, the extent of adsorption was only 11.2%, imply that most of caffeine was left in residual solution. Eluted by acetone-water solution, the purified TP was obtained in which the total content of EGCG, GCG and ECG was 93.8% whilst the content of caffeine was decreased from 9.7% in original TP to 0.04%. The recovery rates of EGCG, GCG and ECG were higher than 80%. Further studies showed that the adsorption selectivity of hide collagen fibre adsorbent to the components of TP is related with their molecular structures. | |||
TO cite this article:Liao Xue-pin,Lu Zhong-bing,Deng Hui, Du Xiao, et al. Selective adsorption property of collagen fibre adsorbent for tea polyphenols[OL].[ 4 April 2005] http://en.paper.edu.cn/en_releasepaper/content/1783 |
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