Journal of Natural Gas Chemistry最新文献_第4页

Partial oxidation of methane in Ba0.5Sr0.5Co0.8Fe0.1Ni0.1O3-δ ceramic membrane reactor 甲烷在Ba0.5Sr0.5Co0.8Fe0.1Ni0.1O3-δ陶瓷膜反应器中的部分氧化

Journal of Natural Gas Chemistry Pub Date : 2012-09-01 DOI: 10.1016/S1003-9953(11)60400-3

Ensieh Ganji Babakhani , Jafar Towfighi , Zahra Taheri , Ali Nakhaei Pour , Majid Zekordi , Ali Taheri

{"title":"Partial oxidation of methane in Ba0.5Sr0.5Co0.8Fe0.1Ni0.1O3-δ ceramic membrane reactor","authors":"Ensieh Ganji Babakhani , Jafar Towfighi , Zahra Taheri , Ali Nakhaei Pour , Majid Zekordi , Ali Taheri","doi":"10.1016/S1003-9953(11)60400-3","DOIUrl":"10.1016/S1003-9953(11)60400-3","url":null,"abstract":"<div>Ba0.5Sr0.5Co0.8Fe0.1Ni0.1O3-δ(BSCFNiO) perovskite oxides were synthesized using a combined EDTA-citrate complexation method, and then pressed into disk and applied in a membrane reactor. The performance of the BSCFNiO membrane reactor was studied for partial oxidation of methane over Ni/a-Al2O3 catalyst. The time dependence of oxygen permeation rate and catalytic performance of BSCFNiO membrane during the catalyst initiation stage were investigated at 850°C. In unsteady state, oxygen permeation rate, methane conversion and CO selectivity were closely related to the state of the catalyst. After 300 min from the initial time, the reaction condition reached to steady state and oxygen permeation rate were obtained about 11.7cm3·cm−2·min−1. Also, the performance of membrane reactor was studied at the temperatures between 750 and 950°C. The results demonstrated good performance for the membrane reactor, as CH4 conversion and CO selectivity permeation rate reached 98% and 97.5%, respectively, and oxygen permeation rate was about 14.5 cm3·cm−2·min−1 which was 6.8 times higher than that of air-helium gradient. Characterization of membrane surface by SEM after reaction showed that the original grains disappeared on both surfaces exposed to the air and reaction side, but XRD profile of the polished surface membrane indicated that the membrane bulk preserved the perovskite structure.</div>","PeriodicalId":56116,"journal":{"name":"Journal of Natural Gas Chemistry","volume":"21 5","pages":"Pages 519-525"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1003-9953(11)60400-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56794457","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: 19

Experimental investigation of fluidized-bed reactor performance for oxidative coupling of methane 甲烷氧化偶联流化床反应器性能的实验研究

Journal of Natural Gas Chemistry Pub Date : 2012-09-01 DOI: 10.1016/S1003-9953(11)60402-7

S. Jašo , S. Sadjadi , H.R. Godini , U. Simon , S. Arndt , O. Görke , A. Berthold , H. Arellano-Garcia , H. Schubert , R. Schomäcker , G. Wozny

{"title":"Experimental investigation of fluidized-bed reactor performance for oxidative coupling of methane","authors":"S. Jašo , S. Sadjadi , H.R. Godini , U. Simon , S. Arndt , O. Görke , A. Berthold , H. Arellano-Garcia , H. Schubert , R. Schomäcker , G. Wozny","doi":"10.1016/S1003-9953(11)60402-7","DOIUrl":"10.1016/S1003-9953(11)60402-7","url":null,"abstract":"<div>Performance of the oxidative coupling of methane in fluidized-bed reactor was experimentally investigated using Mn-Na2WO4/SiO2, La2O3/CaO and La2O3-SrO/CaO catalysts. These catalysts were found to be stable, especially Mn-Na2WO4/SiO2 catalyst. The effect of sodium content of this catalyst was analyzed and the challenge of catalyst agglomeration was addressed using proper catalyst composition of 2%Mn-2.2%Na2WO4/SiO2. For other two catalysts, the effect of Lanthanum-Strontium content was analyzed and 10%La2O3–20%SrO/CaO catalyst was found to provide higher ethylene yield than La2O3/CaO catalyst. Furthermore, the effect of operating parameters such as temperature and methane to oxygen ratio were also reviewed. The highest ethylene and ethane (C2) yield was achieved with the lowest methane to oxygen ratio around 2. 40.5% selectivity to ethylene and ethane and 41% methane conversion were achieved over La2O3-SrO/CaO catalyst while over Mn-Na2WO4/SiO2 catalyst, 40% and 48% were recorded, respectively. Moreover, the consecutive effects of nitrogen dilution, ethylene to ethane production ratio and other performance indicators on the down-stream process units were qualitatively discussed and Mn-Na2WO4/SiO2 catalyst showed a better performance in the reactor and process scale analysis.</div>","PeriodicalId":56116,"journal":{"name":"Journal of Natural Gas Chemistry","volume":"21 5","pages":"Pages 534-543"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1003-9953(11)60402-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56794601","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

Performance assessment of a spiral methanol to hydrogen fuel processor for fuel cell applications 用于燃料电池的螺旋甲醇制氢燃料处理器的性能评估

Journal of Natural Gas Chemistry Pub Date : 2012-09-01 DOI: 10.1016/S1003-9953(11)60401-5

Foad Mehri, Majid Taghizadeh

引用次数: 10

Growth mechanism of palladium clusters on rutile TiO2(110) surface 金红石型TiO2(110)表面钯簇的生长机理

Journal of Natural Gas Chemistry Pub Date : 2012-09-01 DOI: 10.1016/S1003-9953(11)60403-9

Weina Zhao , Huaxiang Lin , Yi Li , Yongfan Zhang , Xin Huang , Wenkai Chen

{"title":"Growth mechanism of palladium clusters on rutile TiO2(110) surface","authors":"Weina Zhao , Huaxiang Lin , Yi Li , Yongfan Zhang , Xin Huang , Wenkai Chen","doi":"10.1016/S1003-9953(11)60403-9","DOIUrl":"10.1016/S1003-9953(11)60403-9","url":null,"abstract":"<div>Oxide-supported transition metal systems have been the subject of enormous interest due to the improvement of catalytic properties relative to the separate metal. Thus in this paper, we embark on a systematic study for Pdn (n = 1–5) clusters adsorbed on TiO2(110) surface based on DFT-GGA calculations utilizing periodic supercell models. A single Pd adatom on the defect-free surface prefers to adsorb at a hollow site bridging a protruded oxygen and a five-fold titanium atom along the [110] direction, while Pd dimer is located on the channels with the Pd-Pd bond parallel to the surface. According to the transition states (TSs) search, the adsorbed Pd trimer tends to triangular growth mode, rather than linear mode, while the Pd4 and Pd5 clusters prefer three-dimensional (3D) models. However, the oxygen vacancy has almost no influence on the promotion of Pdn cluster nucleation. Additionally, of particular significance is that the Pd-TiO2 interaction is the main driving force at the beginning of Pd nucleation, whereas the Pd-Pd interaction gets down to control the growth process of Pd cluster as the cluster gets larger. It is hoped that our theoretical study would shed light on further designing high-performance TiO2 supported Pd-based catalysts.</div>","PeriodicalId":56116,"journal":{"name":"Journal of Natural Gas Chemistry","volume":"21 5","pages":"Pages 544-555"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1003-9953(11)60403-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56794610","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: 10

Preferential oxidation of CO in excess H2 over CeO2/CuO catalyst: Effect of calcination temperature CO在过量H2中优于CeO2/CuO催化剂的优先氧化:煅烧温度的影响

Journal of Natural Gas Chemistry Pub Date : 2012-09-01 DOI: 10.1016/S1003-9953(11)60399-X

Zhiming Gao , Ming Zhou , Hao Deng , Yong Yue

引用次数: 12

Supported ZnO catalysts for the conversion of alkanes: About the metamorphosis of a heterogeneous catalyst 负载型ZnO催化剂在烷烃转化中的应用:关于多相催化剂的变态反应

Journal of Natural Gas Chemistry Pub Date : 2012-09-01 DOI: 10.1016/S1003-9953(11)60407-6

S. Arndt , B. Uysal , A. Berthold , T. Otrebma , Y. Aksu , M. Driess , R. Schomäcker

引用次数: 7

Comparing the deactivation behaviour of Co/CNT and Co/γ-Al2O3 nano catalysts in Fischer-Tropsch synthesis Co/CNT和Co/γ-Al2O3纳米催化剂在费托合成中的失活行为比较

Journal of Natural Gas Chemistry Pub Date : 2012-09-01 DOI: 10.1016/S1003-9953(11)60409-X

Ahmad Tavasoli, Saba Karimi, Somayeh Taghavi, Zahra Zolfaghari, Hamideh Amirfirouzkouhi

{"title":"Comparing the deactivation behaviour of Co/CNT and Co/γ-Al2O3 nano catalysts in Fischer-Tropsch synthesis","authors":"Ahmad Tavasoli, Saba Karimi, Somayeh Taghavi, Zahra Zolfaghari, Hamideh Amirfirouzkouhi","doi":"10.1016/S1003-9953(11)60409-X","DOIUrl":"10.1016/S1003-9953(11)60409-X","url":null,"abstract":"<div>An extensive study of Fischer-Tropsch (FT) synthesis on cobalt nano particles supported on γ-alumina and carbon nanotubes (CNTs) catalysts is reported. 20 wt% of cobalt is loaded on the supports by impregnation method. The deactivation of the two catalysts was studied at 220°C, 2 MPa and 2.7 L/h feed flow rate using a fixed bed micro-reactor. The calcined fresh and used catalysts were characterized extensively and different sources of catalyst deactivation were identified. Formation of cobalt-support mixed oxides in the form of xCoO·yAl2O3 and cobalt aluminates formation were the main sources of the Co/γ-Al2O3 catalyst deactivation. However sintering and cluster growth of cobalt nano particles are the main sources of the Co/CNTs catalyst deactivation. In the case of the CO/γ-Al2O3 catalyst, after 720 h on stream of continuous FT synthesis the average cobalt nano particles diameter increased from 15.9 to 18.4 nm, whereas, under the same reaction conditions the average cobalt nano particles diameter of the Co/CNTs increased from 11.2 to 17.8 nm. Although, the initial FT activity of the Co/CNTs was 26% higher than that of the CO/γ-Al2O3, the FT activity over the Co/CNTs after 720 h on stream decreased by 49% and that over the CO/γ-Al2O3 by 32%. For the CO/γ-Al2O3 catalyst 6.7% of total activity loss and for the Co/CNTs catalyst 11.6% of total activity loss cannot be recovered after regeneration of the catalyst at the same conditions of the first regeneration step. It is concluded that using CNTs as cobalt catalyst support is beneficial in carbon utilization as compared to γ-Al2O3 support, but the Co/CNTs catalyst is more susceptible for deactivation.</div>","PeriodicalId":56116,"journal":{"name":"Journal of Natural Gas Chemistry","volume":"21 5","pages":"Pages 605-613"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1003-9953(11)60409-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56794720","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: 24

Desulfurization kinetics of ZnO sorbent loaded on semi-coke support for hot coal gas 半焦载体负载ZnO吸附剂对热煤气的脱硫动力学研究

Journal of Natural Gas Chemistry Pub Date : 2012-09-01 DOI: 10.1016/S1003-9953(11)60404-0

Zhiwei Ma, Xianrong Zheng, Liping Chang, Ruiyuan He, Weiren Bao

{"title":"Desulfurization kinetics of ZnO sorbent loaded on semi-coke support for hot coal gas","authors":"Zhiwei Ma, Xianrong Zheng, Liping Chang, Ruiyuan He, Weiren Bao","doi":"10.1016/S1003-9953(11)60404-0","DOIUrl":"10.1016/S1003-9953(11)60404-0","url":null,"abstract":"<div>Zn-based sorbent (Z20SC) prepared through semi-coke support in 20 wt% zinc nitrate solution by high-pressure impregnation presents an excellent desulfurization capacity in hot coal gas, in which H2S can not be nearly detected in the outlet gas before 20 h breakthrough time. The effects of the main operational conditions and the particle size of Z20SC sorbent on its desulfurization performances sorbent were investigated in a fixed-bed reactor and the desulfurization kinetics of Z20SC sorbent removing H2S from hot coal gas was calculated based on experimental data. Results showed that the conversion of Z20SC sorbent desulfurization reaction increased with the decrease of the particle size of the sorbent and the increases of gas volumetric flow rate, reaction temperature and H2S content in inlet gas. Z20SC sorbent obtained from hydrothermal synthesis by high-pressure impregnation possessed much larger surface area and pore volume than semi-coke support, and they were significantly reduced after the desulfurization reaction. The equivalent grain model was reasonably used to analyze experimental data, in which ks = 4.382×10−3 exp(−8.270×103/RgT) and Dep = 1.262×10−4exp(−1.522×104/RgT). It suggests that the desulfurization reaction of the Z20SC sorbent is mainly controlled by the chemical reaction in the initial stage and later by the diffusion through the reacted sorbent layer.</div>","PeriodicalId":56116,"journal":{"name":"Journal of Natural Gas Chemistry","volume":"21 5","pages":"Pages 556-562"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1003-9953(11)60404-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56794615","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: 10

Hydrate-based carbon dioxide capture from simulated integrated gasification combined cycle gas 从模拟综合气化联合循环气体中捕获水合物二氧化碳

Journal of Natural Gas Chemistry Pub Date : 2012-09-01 DOI: 10.1016/S1003-9953(11)60397-6

Chungang Xu , Xiaosen Li , Jing Cai , Zhaoyang Chen

{"title":"Hydrate-based carbon dioxide capture from simulated integrated gasification combined cycle gas","authors":"Chungang Xu , Xiaosen Li , Jing Cai , Zhaoyang Chen","doi":"10.1016/S1003-9953(11)60397-6","DOIUrl":"10.1016/S1003-9953(11)60397-6","url":null,"abstract":"<div>The equilibrium hydrate formation conditions for CO2/H2 gas mixtures with different CO2 concentrations in 0.29 mol% TBAB aqueous solution are firstly measured. The results illustrate that the equilibrium hydrate formation pressure increases remarkably with the decrease of CO2 concentration in the gas mixture. Based on the phase equilibrium data, a three stages hydrate CO2 separation from integrated gasification combined cycle (IGCC) synthesis gas is investigated. Because the separation efficiency is quite low for the third hydrate separation, a hybrid CO2 separation process of two hydrate stages in conjunction with one chemical absorption process (absorption with MEA) is proposed and studied. The experimental results show H2 concentration in the final residual gas released from the three stages hydrate CO2 separation process was approximately 95.0 mol% while that released from the hybrid CO2 separation process was approximately 99.4 mol%. Thus, the hybrid process is possible to be a promising technology for the industrial application in the future.</div>","PeriodicalId":56116,"journal":{"name":"Journal of Natural Gas Chemistry","volume":"21 5","pages":"Pages 501-507"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1003-9953(11)60397-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56794673","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

Experimental studies of biomass gasification with air 生物质空气气化实验研究

Journal of Natural Gas Chemistry Pub Date : 2012-07-01 DOI: 10.1016/S1003-9953(11)60379-4

Huili Liu, Jianhang Hu, Hua Wang, Chao Wang, Juanqin Li

{"title":"Experimental studies of biomass gasification with air","authors":"Huili Liu, Jianhang Hu, Hua Wang, Chao Wang, Juanqin Li","doi":"10.1016/S1003-9953(11)60379-4","DOIUrl":"10.1016/S1003-9953(11)60379-4","url":null,"abstract":"<div>In this work, experimental studies of biomass gasification under different operating conditions were carried out in an updraft gasifier combined with a copper slag reformer. The influence of gasification temperature, equivalence ratio (ER) and copper slag catalyst addition on gas production and tar yield were investigated. The experimental results showed that the content of H2 and CO, gas yield and LHV increased, while the tar yield and the content of CO2, CH4 and C2Hx in the gas product decreased with the temperature. At 800 °C, with the increase of ER, the LHV, the tar yield and the content of H2, CO, CH4 and C2Hx in gas products decreased, while the gas yield and the content of CO2 increased. Copper slag was introduced into the secondary reformer for tar decomposition. The Fe3O4 phase in the fresh copper slag was reduced to FeO (Fe2+) and metallic Fe by the gas product. Fe species (FeO and metallic Fe) acted as the active sites for tar catalytic decomposition. The catalytic temperature had a significant influence on tar conversion and the composition of the gas product. Typically, the tar conversion of about 17%–54% could be achieved when the catalytic temperature was varied from 750 to 950 °C. Also, the content of H2 and CO increased with the catalytic temperature, while that of CO2, CH4 and C2Hx in the gas product decreased. It was demonstrated that copper slag was a good catalyst for upgrading the gas product from biomass gasification.</div>","PeriodicalId":56116,"journal":{"name":"Journal of Natural Gas Chemistry","volume":"21 4","pages":"Pages 374-380"},"PeriodicalIF":0.0,"publicationDate":"2012-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1003-9953(11)60379-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56793192","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: 33