Journal of Natural Gas Chemistry最新文献_第10页

Kinetic hydrate inhibitor performance of new copolymer poly(N-vinyl-2-pyrrolidone-co-2-vinyl pyridine)s with TBAB 新共聚物聚(n -乙烯基-2-吡咯烷酮-co-2-乙烯基吡啶)与TBAB的动态水合物抑制剂性能

Journal of Natural Gas Chemistry Pub Date : 2012-03-01 DOI: 10.1016/S1003-9953(11)60344-7

Jun Hu , Sijia Li , Yanhong Wang , Xuemei Lang , Qingping Li , Shuanshi Fan

{"title":"Kinetic hydrate inhibitor performance of new copolymer poly(N-vinyl-2-pyrrolidone-co-2-vinyl pyridine)s with TBAB","authors":"Jun Hu , Sijia Li , Yanhong Wang , Xuemei Lang , Qingping Li , Shuanshi Fan","doi":"10.1016/S1003-9953(11)60344-7","DOIUrl":"10.1016/S1003-9953(11)60344-7","url":null,"abstract":"<div>In oil and gas field, the application of kinetic hydrate inhibitors (KHIs) independently has remained problematic in high subcooling and high water-cut situation. One feasible method to resolve this problem is the combined use of KHIs and some synergists, which would enhance KHIs' inhibitory effect on both hydrate nucleation and hydrate crystal growth. In this study, a novel kind of KHI copolymer poly(N-vinyl-2-pyrrolidone-co-2-vinyl pyridine)s (HGs) is used in conjunction with TBAB to show its high performance on hydrate inhibition. The performance of HGs with different monomer ratios in structure II tetrahydrofuran (THF) hydrate is investigated using kinetic hydrate inhibitor evaluation apparatus by step-cooling method and isothermal cooling method. With the combined gas hydrate inhibitor at the concentration of 1.0 wt%, the induction time of 19 wt% THF solution could be prolonged to 8.5 h at a high subcooling of 6 °C. Finally, the mechanism of HGs inhibiting the formation of gas hydrate is proposed.</div>","PeriodicalId":56116,"journal":{"name":"Journal of Natural Gas Chemistry","volume":"21 2","pages":"Pages 126-131"},"PeriodicalIF":0.0,"publicationDate":"2012-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1003-9953(11)60344-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56791324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 26

Dry reforming reaction over nickel catalysts supported on nanocrystalline calcium aluminates with different CaO/Al2O3 ratios 不同CaO/Al2O3纳米晶铝酸钙负载镍催化剂上的干重整反应

Journal of Natural Gas Chemistry Pub Date : 2012-03-01 DOI: 10.1016/S1003-9953(11)60351-4

Atiyeh Ranjbar , Mehran Rezaei

引用次数: 24

Weakening internal diffusion effect in selective hydrodesulfurization of FCC gasoline by novel designed eggshell CoMoS/Al2O3 catalysts 新型蛋壳型CoMoS/Al2O3催化剂在FCC汽油选择性加氢脱硫中的内扩散减弱效应

Journal of Natural Gas Chemistry Pub Date : 2012-03-01 DOI: 10.1016/S1003-9953(11)60354-X

Bin Liu, Yongming Chai, Yajing Wang, Yunqi Liu, Chenguang Liu

引用次数: 5

Ni/Al2O3 catalysts for syngas methanation: Effect of Mn promoter 合成气甲烷化Ni/Al2O3催化剂:Mn促进剂的作用

Journal of Natural Gas Chemistry Pub Date : 2012-03-01 DOI: 10.1016/S1003-9953(11)60350-2

Anmin Zhao, Weiyong Ying, Haitao Zhang, Ma Hongfang, Dingye Fang

引用次数: 91

Mathematical modeling of a slurry reactor for DME direct synthesis from syngas 合成气直接合成二甲醚的料浆反应器数学建模

Journal of Natural Gas Chemistry Pub Date : 2012-03-01 DOI: 10.1016/S1003-9953(11)60347-2

Sadegh Papari, Mohammad Kazemeini, Moslem Fattahi

{"title":"Mathematical modeling of a slurry reactor for DME direct synthesis from syngas","authors":"Sadegh Papari, Mohammad Kazemeini, Moslem Fattahi","doi":"10.1016/S1003-9953(11)60347-2","DOIUrl":"10.1016/S1003-9953(11)60347-2","url":null,"abstract":"<div>In this paper, an axial dispersion mathematical model is developed to simulate a three-phase slurry bubble column reactor for direct synthesis of dimethyl ether (DME) from syngas. This large-scale reactor is modeled using mass and energy balances, catalyst sedimentation and single-bubble as well as two-bubbles class flow hydrodynamics. A comparison between the two hydrodynamic models through pilot plant experimental data from the literature shows that heterogeneous two-bubbles flow model is in better agreement with the experimental data than homogeneous single-bubble gas flow model. Also, by investigating the heterogeneous gas flow and axial dispersion model for small bubbles as well as the large bubbles and slurry (i.e. including paraffins and the catalyst) phase, the temperature profile along the reactor is obtained. A comparison between isothermal and non-isothermal reactors reveals no obvious performance difference between them. The optimum values of reactor diameter and height were obtained at 7 m and 50 m, respectively. The effects of operating variables on the axial catalyst distribution, DME productivity and CO conversion are also investigated in this research.</div>","PeriodicalId":56116,"journal":{"name":"Journal of Natural Gas Chemistry","volume":"21 2","pages":"Pages 148-157"},"PeriodicalIF":0.0,"publicationDate":"2012-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1003-9953(11)60347-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56791478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 27

Effect of rapidly depressurizing and rising temperature on methane hydrate dissociation 快速减压和升温对甲烷水合物解离的影响

Journal of Natural Gas Chemistry Pub Date : 2012-01-01 DOI: 10.1016/S1003-9953(11)60338-1

Qingbai Wu, Yingmei Wang, Jing Zhan

{"title":"Effect of rapidly depressurizing and rising temperature on methane hydrate dissociation","authors":"Qingbai Wu, Yingmei Wang, Jing Zhan","doi":"10.1016/S1003-9953(11)60338-1","DOIUrl":"10.1016/S1003-9953(11)60338-1","url":null,"abstract":"<div>Two methods, rapidly depressurizing to 0.1 MPa at a constant temperature and rising temperature under equilibrium P, T conditions, were used to study the dissociation of pure CH4 hydrate formed below the ice point. At a constant temperature with rapidly depressurizing to 0.1 MPa, CH4 hydrate dissociated rapidly at initial dissociation and then the dissociation rate gradually decreased. However, the dissociation of CH4 hydrate at temperatures of 261 to 266 K was much faster than that at temperatures of 269 to 272 K, indicating its anomalous preservation. Under an equilibrium P, T conditions, rising temperature had extensively controlling impact on dissociation of CH4 hydrate at equilibrium pressures of 2.31, 2.16 and 1.96 MPa. In this study, we report the effect of pressure on CH4 hydrate dissociation, especially the effect of equilibrium pressure on dissociation at various melting temperatures. And we find that the ice particles size of CH4 hydrate formed may dominant the CH4 hydrate dissociation. Dissociation of CH4 hydrate formed from ice particles of smaller than 250 μm may not have an anomalous preservation below the ice point, while particles larger than 250 μm may have more extensive anomalous preservation.</div>","PeriodicalId":56116,"journal":{"name":"Journal of Natural Gas Chemistry","volume":"21 1","pages":"Pages 91-97"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1003-9953(11)60338-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56790440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

CH4 dissociation on Co(0001): A density functional theory study Co(0001)上CH4解离:密度泛函理论研究

Journal of Natural Gas Chemistry Pub Date : 2012-01-01 DOI: 10.1016/S1003-9953(11)60339-3

Wei Huang , Lulu Sun , Peide Han , Jinzhen Zhao

引用次数: 5

Effect of alcohol solvents treated ZrO(OH)2 hydrogel on properties of ZrO2 and its catalytic performance in isosynthesis 醇溶剂处理ZrO(OH)2水凝胶对ZrO(OH)2性质及其同工合成催化性能的影响

Journal of Natural Gas Chemistry Pub Date : 2012-01-01 DOI: 10.1016/S1003-9953(11)60324-1

Rongjun Zhang, Dehua He

{"title":"Effect of alcohol solvents treated ZrO(OH)2 hydrogel on properties of ZrO2 and its catalytic performance in isosynthesis","authors":"Rongjun Zhang, Dehua He","doi":"10.1016/S1003-9953(11)60324-1","DOIUrl":"10.1016/S1003-9953(11)60324-1","url":null,"abstract":"<div>A series of ZrO2 catalysts were prepared by treating ZrO(OH)2 hydrogel with different alcohol solvents (C2-C4 alcohols) and calcining under N2 flow at 773 K for 3 h. The obtained ZrO2 catalysts were systematically characterized by the methods of N2 adsorption-desorption, powder X-ray diffraction, NH3 temperature-programmed desorption, and CO2 temperature-programmed desorption. The catalytic performance of each catalyst was evaluated in the selective synthesis of iso-C4 (isobutene and isobutane) and light olefins (\u0000<math><mrow><msubsup><mtext>C</mtext><mn>2</mn><mo>=</mo></msubsup><mi></mi><mo>∼</mo><msubsup><mtext>C</mtext><mn>4</mn><mo>=</mo></msubsup></mrow></math>) from CO hydrogenation. The specific surface area increased for the ZrO2 catalysts obtained by treating ZrO(OH)2 hydrogel with different alcohol solvents. The amounts of both acidic and basic sites on the catalyst surface increased obviously. The catalytic activity (CO conversion) of ZrO2 catalysts also increased after the treatment with different alcohol solvents. The highest activity was obtained over the catalyst which was pretreated with isopropanol. However, alcohol solvent treatment retarded the transformation of ZrO2 crystal structure from tetragonal phase to monoclinic phase, and subsequently resulted in the decrease of monoclinic phase in ZrO2, which led to the decrease of olefin selectivity in corresponding hydrocarbon products (\u0000<math><mrow><msubsup><mtext>C</mtext><mn>2</mn><mo>=</mo></msubsup><mi></mi><mo>∼</mo><msubsup><mtext>C</mtext><mn>4</mn><mo>=</mo></msubsup><mo>/</mo><mtext>CH</mtext></mrow></math>).</div>","PeriodicalId":56116,"journal":{"name":"Journal of Natural Gas Chemistry","volume":"21 1","pages":"Pages 1-6"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1003-9953(11)60324-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56789080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

Comparison of purification processes of natural gas obtained from three different regions in the world 世界上三个不同地区天然气净化工艺的比较

Journal of Natural Gas Chemistry Pub Date : 2012-01-01 DOI: 10.1016/S1003-9953(11)60334-4

Tansel Koyun , Mehmet Kunduz , Hakan F. Oztop , Ibrahim Ucgul

引用次数: 4

Negative effect of Ni on PtHY in n-pentane isomerization evidenced by IR and ESR studies IR和ESR研究证实了Ni对正戊烷异构化过程中PtHY的负面影响

Journal of Natural Gas Chemistry Pub Date : 2012-01-01 DOI: 10.1016/S1003-9953(11)60329-0

Muhammad Arif Ab Aziz , Nur Hidayatul Nazirah Kamarudin , Herma Dina Setiabudi , Halimaton Hamdan , Aishah Abdul Jalil , Sugeng Triwahyono

{"title":"Negative effect of Ni on PtHY in n-pentane isomerization evidenced by IR and ESR studies","authors":"Muhammad Arif Ab Aziz , Nur Hidayatul Nazirah Kamarudin , Herma Dina Setiabudi , Halimaton Hamdan , Aishah Abdul Jalil , Sugeng Triwahyono","doi":"10.1016/S1003-9953(11)60329-0","DOIUrl":"10.1016/S1003-9953(11)60329-0","url":null,"abstract":"<div>Ni/PtHY with different Ni loadings was prepared by impregnating HY with hexachloroplatinic acid solution and Ni2+/N, N-dimethylformamide solution. An increase in the Ni loading decreased the crystallinity, specific surface area and meso-micropores of the catalysts. Ni interacted with hydroxyl groups to produce IR absorption bands at 3740–3500 cm−1. Increasing Ni loadings resulted in a decrease in the intensities of the broad bands at 3730-3500 cm−1 and the sharp band at 3740 cm−1 with simultaneous development of new absorbance band at 3700 cm−1 that was attributed to (–OH)Ni. The acidity of the samples did not significantly change with Ni loadings up to 1.0 wt%, which indicated that Ni mostly interacts with non-acidic silanol groups (terminal- and structural-defect OH groups). The presence of Ni decreased the activity of PtHY toward the isomerization of n-pentane because of a decrease in the number of active protonic-acid sites that formed from molecular hydrogen. IR and ESR studies confirmed that Pt facilitated the formation of protonic-acid sites from molecular hydrogen, whereas Ni, even when combined with Pt, didn't exhibit such ability. The absence of protonic-acid sites from molecular hydrogen significantly decreased the yield of iso-pentane and markedly increased the cracking products.</div>","PeriodicalId":56116,"journal":{"name":"Journal of Natural Gas Chemistry","volume":"21 1","pages":"Pages 29-36"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1003-9953(11)60329-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56789773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 21