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苊二亚胺镍/SiO_2-MgCl_2/AlEt_2Cl催化乙烯的聚合反应 认领 引用 被引量：3
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作者 江洪流 卢金山 《高分子材料科学与工程》 EI CAS 北大核心 2010年第1期16-18,共3页
制备了一种含有胺基官能团的α-二亚胺镍配合物,并将该配合物负载在AlEt_3改性的SiO_2-MgCl_2复合载体上制备负载催化剂,不用昂贵的MAO(甲基铝氧烷)而用AlEt_2Cl作助催化剂,研究了其对乙烯的聚合性能。并采用高温13CNMR、高温GPC、... 制备了一种含有胺基官能团的α-二亚胺镍配合物,并将该配合物负载在AlEt_3改性的SiO_2-MgCl_2复合载体上制备负载催化剂,不用昂贵的MAO(甲基铝氧烷)而用AlEt_2Cl作助催化剂,研究了其对乙烯的聚合性能。并采用高温13CNMR、高温GPC、差示扫描量热法(DSC)等对得到的聚合物进行了研究。结果发现,该催化剂具有很高的催化活性(1.89×10~6g of PE/mol of Ni h),得到的聚乙烯产品含有各种短支链(甲基、乙基、丙基、丁基)和长支链,分子量在2.15×10~5～9.27×10~5之间,分子量分布为3.12～4.23。 展开更多
关键词 α-二亚胺镍配合物 SiO2-MgCl2复合载体 支化聚乙烯
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Partial oxidation of methane over SiO2 supported Ni and NiCe catalysts 认领 引用 被引量：4
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作者 A.Emamdoust V.La Parola +3 位作者 G.Pantaleo M.L.Testa S.Farjami Shayesteh A.M.Venezia 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第8期1-9,I0001,共9页
Nickel and nickel-ceria catalysts supported on high surface area silica, with 6 wt% Ni and 20 wt% CeO2 were prepared by microwave assisted(co) precipitation method. The catalysts were investigated by XRD,TPR and XPS a... Nickel and nickel-ceria catalysts supported on high surface area silica, with 6 wt% Ni and 20 wt% CeO2 were prepared by microwave assisted(co) precipitation method. The catalysts were investigated by XRD,TPR and XPS analyses and they were tested in partial oxidation of methane(CPO). The catalytic reaction was carried out at atmospheric pressure in a temperature range of 400–800℃ with a feed gas mixture containing methane and oxygen in a molecular ratio CH4/O2=2. The Ni catalyst exhibited 60% methane conversion with 60% selectivity to CO already at 500℃. On the contrary, the Ni–Ce catalyst was inert to CPO up to 700℃. Moreover, the former catalyst reproduced its activity at the descending temperatures maintaining a good stability at 600℃, over a reaction time of 80 h, whereas the latter one completely deactivated. Test of CH4 temperature programmed surface reaction(CH4-TPSR) revealed a higher methane activation temperature(> 100℃) for the Ni–Ce catalyst as compared to the Ni one. Noticeable improvement of the ceria containing catalyst occurred when the reaction test started at a temperature higher than the methane decomposition temperature. In this case, the sample achieved the same catalytic behavior of the Ni catalyst. As confirmed by XPS analyses, the distinct electronic state of the supported nickel was responsible for the differences in catalytic behavior. 展开更多
关键词 Methane catalytic partial oxidation(CPO) Ni catalyst NiCe SiO2 supported catalysts
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Preparation of Spherical MgCl_2/SiO_2/THF-Supported Late-Transition Metal Catalysts for Ethylene Polymerization 认领 引用
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作者 Bai Wei Gao Xianglu +2 位作者 Wu Haotian Cao Chengang Jiang Tao 《China Petroleum Processing & Petrochemical Technology》 CAS 2014年第3期77-83,共7页
A facile and user friendly technique to immobilize the late-transition metal complexes on spherical MgCl2/SiO2/THF support has been developed. The spherical MgCl2/SiO2/THF-supported late-transition metal catalysts 2,6... A facile and user friendly technique to immobilize the late-transition metal complexes on spherical MgCl2/SiO2/THF support has been developed. The spherical MgCl2/SiO2/THF-supported late-transition metal catalysts 2,6-bis-[1-(2,6-dimethylphenylimino)ethyl]pyridine iron(II) dichloride(SC-A) and 1,4-bis(2,6-dimethylphenyl)- acenaphthene diimine nickel(II) dibromide(SC-B) for ethylene polymerization has been prepared by spray-drying technique using tetrahydrofuran suspension containing MgCl2, SiO2 and late-transition metal complexes. The catalysts were characterized by BET, XRD, SEM and the polymers were analyzed using GPC, DSC and 13C-NMR. The test results show that spray-drying is a very effective method for immobilizing late-transition metal catalysts for ethylene polymerization. Among six kinds of cocatalysts for olefin polymerization, TMA and TEA were confirmed to be more effective than other compounds for the ethylene polymerization system using the catalyst SC-A. For the case of the catalyst SC-B, DEAC showed the best performance as cocatalysts in ethylene polymerization. The replication of the catalyst morphology was found in the resultant polyethylene. 展开更多
关键词 MgCl2/SiO2/THF support late-transition metal catalyst polymerization of ethylene spray-drying
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IN SITU FT-IR OF SiO_2-SUPPORTED Pt-Mo HETEROBINUCLEAR METAL CARBONYL HYDRIDE CATALYST FOR CO HYDROGENATION 认领 引用
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作者 Chang Ping SHAOHai You WANG and Jin Lai xu 《Chinese Chemical Letters》 SCIE CAS 1994年第8期687-688,共2页
In situ FT-IR of SiO2-supported (pph3)Hpt(μ-pph2)(μ-CO)Mo(co)4heterobinuclear hydrido carbonyl catalyst in the CO hydrogenation condition has been investigated.
关键词 SiO2 SUPPORTED OF SITU Pt CARBONYL FT Mo CO IR
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CO_2 HYDROGENATION OVER SiO_2-SUPPORTED HETEROBINUCLEAR METAL COMPLEX CATALYSTS 认领 引用
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作者 Chang Ping SHAO 《Chinese Chemical Letters》 SCIE CAS 1995年第12期1081-1082,共2页
The SiO2-Supported (PPh3)2HPt(μ-CO) (μ-PPh2)M(CO) 4 (M-Cr.Mo, W) complel catalysts catalyzing CO2 hydrogenation are reported.The catalysts exhibited high catalytic activity and selectivity toward oxygenates
关键词 SiO2 OVER SUPPORTED HETEROBINUCLEAR HYDROGENATION METAL CO2 CATALYSTS 二氧化碳
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MgCl_2-SiO_2复合载体型Ziegler-Natta乙烯聚合催化剂 认领 引用 被引量：10
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作者 任合刚 张瑞 +3 位作者 白鹏 曲佳燕 刘宾元 王延吉 《石油化工》 CAS CSCD 北大核心 2011年第7期732-736,共5页
采用相同的制备工艺,制备了4种不同SiO2加入量的MgCl2-SiO2复合载体型Ziegler-Natta催化剂,考察了SiO2加入量对催化剂的形态、结构及其催化乙烯聚合性能的影响;并用BET,SEM,XRD等方法对催化剂的形态和物性进行了表征。实验结果表明,加入... 采用相同的制备工艺,制备了4种不同SiO2加入量的MgCl2-SiO2复合载体型Ziegler-Natta催化剂,考察了SiO2加入量对催化剂的形态、结构及其催化乙烯聚合性能的影响;并用BET,SEM,XRD等方法对催化剂的形态和物性进行了表征。实验结果表明,加入SiO2可以改善催化剂的颗粒形态和均匀程度;随SiO2加入量的增加,催化剂活性降低,聚乙烯的堆密度和熔体流动指数呈先增大后趋于平稳的趋势;当m(SiO2)∶m(MgCl2)=5.0时,催化剂的形态和性能较好,聚乙烯的堆密度为0.35g/cm3,熔体流动指数(10min)为0.12g,粒径为75～750μm的颗粒的质量分数为98.67%。 展开更多
关键词 氯化镁-二氧化硅复合载体 Ziegler-Natta催化剂 乙烯聚合 聚乙烯
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邻苯二甲酸二异辛酯对MgCl_2-SiO_2负载Ziegler-Natta催化剂催化乙烯聚合的影响 认领 引用 被引量：5
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作者 白鹏 王路海 +3 位作者 任合刚 张瑞 杨敏 刘宾元 《石油化工》 CAS CSCD 北大核心 2011年第3期264-267,共4页
采用邻苯二甲酸二异辛酯(DIOP)为内给电子体,制备了MgCl2-SiO2复合载体负载的Ziegler-Natta催化剂;考察了DIOP加入量对催化剂的形态结构及其催化乙烯与1-己烯共聚反应性能的影响,并利用N2吸附-脱附、SEM和XRD等测试手段对催化剂的形态... 采用邻苯二甲酸二异辛酯(DIOP)为内给电子体,制备了MgCl2-SiO2复合载体负载的Ziegler-Natta催化剂;考察了DIOP加入量对催化剂的形态结构及其催化乙烯与1-己烯共聚反应性能的影响,并利用N2吸附-脱附、SEM和XRD等测试手段对催化剂的形态和物性进行了表征。实验结果表明,加入DIOP可以改善催化剂的颗粒形态和均匀程度;随DIOP加入量的增加,催化剂活性降低,共聚物的堆密度和熔体流动指数呈先升高后降低的趋势。当n(DIOP)∶n(Mg)=0.10时,催化剂的形态和性能较好,共聚物的堆密度为0.35 g/cm3,熔体流动指数(10 min)为0.18 g,粒径为75～750μm的颗粒的质量分数为98.36%。 展开更多
关键词 MgCl2-SiO2复合载体 Ziegler-Natta催化剂 邻苯二甲酸二异辛酯 乙烯聚合
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Zr(Ⅳ) surface sites determine CH3OH formation rate on Cu/ZrO2/SiO2-CO2 hydrogenation catalysts 认领 引用 被引量：3
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作者 Erwin Lam Kim Larmier +3 位作者 Shohei Tada Patrick Wolf Olga V. Safonova Christophe Copéret 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第11期1741-1748,共8页
Cu/ZrO2/SiO2 are efficient catalysts for the selective hydrogenation of CO2 to CH3OH. In order to understand the role of ZrO2 in these mixed-oxides based catalysts, in situ X-ray absorption spectroscopy has been carri... Cu/ZrO2/SiO2 are efficient catalysts for the selective hydrogenation of CO2 to CH3OH. In order to understand the role of ZrO2 in these mixed-oxides based catalysts, in situ X-ray absorption spectroscopy has been carried out on the Cu and Zr K-edge. Under reaction conditions, Cu remains metallic, while Zr is present in three types of coordination environment associated with 1) bulk ZrO2, 2) coordinatively saturated and 3) unsaturated Zr(Ⅳ) surface sites. The amount of coordinatively unsaturated Zr surface sites can be quantified by linear combination fit of reference X-Ray absorption near edge structure (XANES) spectra and its amount correlates with CH3OH formation rates, thus indicating the importance of Zr(Ⅳ) Lewis acid surface sites in driving the selectivity toward CH3OH. This finding is consistent with the proposed mechanism, where CO2 is hydrogenated at the interface between the Cu nanoparticles that split H2 and Zr(Ⅳ) surface sites that stabilizes reaction intermediates. 展开更多
关键词 CO2 hydrogenation ZrO2/SiO2 supported Cu nanoparticles Lewis acidic surface sites In situ X-ray absorption spectroscopy
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(二苯甲酰甲烷基)(环戊二烯基)二氯化钛/MgCl_2-SiO_2MAO中各组分对乙烯聚合的影响 认领 引用
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作者 孙敏 许学翔 +2 位作者 赵伟 纪洪波 景振华 《高分子学报》 SCIE CAS 北大核心 2004年第3期406-409,共4页
研究开发了一种新型非茂负载乙烯聚合催化剂 CpTi(dbm)Cl2 MgCl2 SiO2 MAO ,并考察了该催化剂中各组分对乙烯聚合活性的影响 .结果表明 ,SiO2 不仅可以改善催化剂的流动性和分散性 ,还有益于提高催化活性 .MgCl2 对活性中心有一定化学... 研究开发了一种新型非茂负载乙烯聚合催化剂 CpTi(dbm)Cl2 MgCl2 SiO2 MAO ,并考察了该催化剂中各组分对乙烯聚合活性的影响 .结果表明 ,SiO2 不仅可以改善催化剂的流动性和分散性 ,还有益于提高催化活性 .MgCl2 对活性中心有一定化学改性作用 ;MgCl2 、SiO2 和CpTi(dbm)Cl2 的比例的变化对载体型催化剂的催化活性有一定影响作用 ;采用适量的MAO对复合载体MgCl2 SiO2 活化 ,能提高催化活性 .用ZnCl2 MAO对SiO2处理制成的复合载体催化剂CpTi(dbm)Cl2 MgCl2 ZnCl2 SiO2 MAO ,可以提高催化活性 ,“锌调”作用明显 ,随着锌化合物含量的增加 ,聚合物相对分子质量下降 ,相对分子质量分布加宽 ,并且其催化活性也增加 . 展开更多
关键词 乙烯 聚合反应 非茂有机金属催化剂 β-二酮-茂型钛配合物 氯化镁-二氧化硅负载 催化剂 组分
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助剂及载体对MoO_3·M_xO_y/SiO_2 催化剂性质及甲烷部分氧化性能的影响 认领 引用
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作者 李静谊 李曼尼 林培滋 《内蒙古大学学报（自然科学版）》 CAS 2000年第2期173-176,共4页
在常压下 ,以氧气为氧化剂 ,用两种不同制法的载体分别制备催化剂 (MoO3 ·MxOy/SiO2 ) ,用于甲烷部分氧化反应 ,对比结果表明用醇盐法所制SiO2 (ZSiO2 )做成的催化剂比用市售SiO2 (QSiO2 )做成的催化剂反应活性和选择性好 ,助剂V2... 在常压下 ,以氧气为氧化剂 ,用两种不同制法的载体分别制备催化剂 (MoO3 ·MxOy/SiO2 ) ,用于甲烷部分氧化反应 ,对比结果表明用醇盐法所制SiO2 (ZSiO2 )做成的催化剂比用市售SiO2 (QSiO2 )做成的催化剂反应活性和选择性好 ,助剂V2 O5加入提高了CH4 转化率和CO2 ,CO选择性 ,降低了HCHO产率和选择性 ,B2 O3 加入提高了CH4 转化率 ,HCHO产率和其选择性 ,降低了CO2 ,CO选择性 ,TPR结果表明载体ZSiO3 的应用减少了载体表面弱酸性位 ,但助剂V2 O5和B2 O3 的加入使MoO3 与ZSiO2 发生了不同的相互作用 ,从而影响了催化剂表面的活性氧物种 ;NH3 TPD结果表明载体ZSiO3 的应用及助剂B2 O3 展开更多
关键词 醇盐法 载体 助剂 甲烷 部分氧化 催化剂
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Dehydrogenation of n-butane over vanadia catalysts supported on silica gel 认领 引用 被引量：6
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作者 Yuebing Xu Jiangyin Lu +1 位作者 Mei Zhong Jide Wang 《Journal of Natural Gas Chemistry》 2009年第1期88-93,共6页
VOx/SiO2 catalysts prepared by impregnation method were used for catalytic dehydrogenation of n-butane to butenes and characterized by X-ray diffraction,FT-IR,UV-vis,Raman,and BET measurements.The effects of VOx loadi... VOx/SiO2 catalysts prepared by impregnation method were used for catalytic dehydrogenation of n-butane to butenes and characterized by X-ray diffraction,FT-IR,UV-vis,Raman,and BET measurements.The effects of VOx loading and the reaction temperature on the VOx/SiO2 catalysts and their catalytic performances for the dehydrogenation of n-butane were studied.When the VOx loading was 12%g/gcat and reaction temperature was between 590℃and 600℃,n-butane conversion and butenes yields reached the highest value under H2 flux of 10 ml/min and n-butane flux of 10 ml/min.Product distribution,such as the ratio of 2-butene to 1-butene and the ratio of cis-2-butene to trans-2-butene,was mainly influenced by the reaction temperature. 展开更多
关键词 n-butane catalytic dehydrogenation butene VOx supported SiO2
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The surface properties of aluminated meso–macroporous silica and its catalytic performance as hydrodesulfurization catalyst support 认领 引用 被引量：2
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作者 Zhi-Gang Wang Jia-Ning Pei +5 位作者 Sheng-Li Chen Zheng Zhou Gui-Mei Yuan Zhi-Qing Wang Guo-Qiang Ren Hong-Jun Jiang 《Petroleum Science》 SCIE CAS CSCD 2017年第2期424-433,共10页
Aluminated mesoporous silica was prepared by multiple post-grafting of alumina onto uniform mesoporous SiO2 ,which was assembled from monodisperse SiO2 microspheres.Hydrodesulfurization（HDS）catalyst was prepared by ... Aluminated mesoporous silica was prepared by multiple post-grafting of alumina onto uniform mesoporous SiO2 ,which was assembled from monodisperse SiO2 microspheres.Hydrodesulfurization（HDS）catalyst was prepared by loading Ni and Mo active components onto the aluminated uniform mesoporous SiO2 ,and its HDS catalytic performance was evaluated using hydrodesulfurization of dibenzothiophene as the probe reaction at 300℃ and 6.0 MPa in a tubular reactor.The samples were characterized by N2 physisorption,scanning electronic microscopy,Fourier transform infrared spectrum,X-ray diffraction（XRD）,temperature-programmed desorption of ammonia（NH3-TPD）,^27Al nuclear magnetic resonance（^27Al-NMR）and high-resolution transmission electron microscopy（HRTEM）.The results showed that the Si–OH group content of SiO2 was mainly dependent on the pretreatment conditions and had significant influence on the activity of the Ni Mo catalyst.The surface properties of the aluminated SiO2 varied with the Al2O3-grafting cycles.Generally after four cycles of grafting,the aluminated SiO2 behaved like amorphous alumina.In addition,plotting of activity of Ni Mo catalysts supported on aluminated meso–macroporous silica materials against the Al2O3-grafting cycle yields a volcano curve. 展开更多
关键词 Aluminum grafting Hydrodesulfurization Surface properties Catalyst support SiO2
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喷雾干燥技术在聚烯烃Ziegler-Natta催化剂制备工艺中应用的研究进展 认领 引用 被引量：2
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作者 刘涛 夏先知 毛炳权 《石油化工》 CAS CSCD 北大核心 2018年第6期641-647,共7页
综述了喷雾干燥技术在聚烯烃Ziegler-Natta催化剂制备工艺中的应用及其研究进展,包括载体的制备和催化剂的制备。在聚乙烯催化剂领域,喷雾干燥技术可用于MgCl_2载体及MgCl_2/SiO_2复合载体催化剂的制备。在聚丙烯催化剂领域,喷雾干燥技... 综述了喷雾干燥技术在聚烯烃Ziegler-Natta催化剂制备工艺中的应用及其研究进展,包括载体的制备和催化剂的制备。在聚乙烯催化剂领域,喷雾干燥技术可用于MgCl_2载体及MgCl_2/SiO_2复合载体催化剂的制备。在聚丙烯催化剂领域,喷雾干燥技术可用于MgCl_2载体、MgCl_2/SiO_2复合载体及无载体催化剂的制备。原料配比和喷雾干燥条件是决定载体和催化剂性能的主要因素。载体的适用性及所制备催化剂的性能可以通过不同的原料配比及对喷雾干燥条件进行合理的调控,从而满足不同催化剂的聚合要求。 展开更多
关键词 喷雾干燥 氯化镁载体 氯化镁/二氧化硅载体 Ziegler-Natta催化剂 乙烯聚合 丙烯聚合
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内给电子体在气相聚乙烯合成催化剂中作用的研究 认领 引用 被引量：1
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作者 杜波 《天然气化工—C1化学与化工》 CSCD 北大核心 2020年第3期33-36,共4页
采用浸渍法制备了用于聚乙烯合成的MgCl2/SiO2复合载体型Ziegler-Natta催化剂,在制备过程中加入酯、硼、醇和硅烷四类内给电子体;考察了不同内给电子体对Ziegler-Natta催化剂的活性、氢调敏感性及乙烯/1-己烯共聚性能的影响。结果表明:... 采用浸渍法制备了用于聚乙烯合成的MgCl2/SiO2复合载体型Ziegler-Natta催化剂,在制备过程中加入酯、硼、醇和硅烷四类内给电子体;考察了不同内给电子体对Ziegler-Natta催化剂的活性、氢调敏感性及乙烯/1-己烯共聚性能的影响。结果表明:乙醇作为内给电子体效果最好,催化剂具有较高的催化活性、氢调敏感性和共聚性能。 展开更多
关键词 气相聚乙烯 内给电子体 MgCl2/SiO2复合载体 Ziegler-Natta催化剂
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Immobilization of Glucose Oxidase on Ordered Macroporous Silicas Functionalized with Amino Group 认领 引用 被引量：2
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作者 Wu,Quanzhou He,Jianfeng +1 位作者 Zhang,Jingjia Ou,Jiming 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2012年第2期283-287,共5页
A novel glucose oxidase immobilized on three-dimensionally ordered macroporous （3DOM） material has been prepared by firstly preparation of hybrid 3DOM SiO2-NH2 materials using colloidal crystal method, and following... A novel glucose oxidase immobilized on three-dimensionally ordered macroporous （3DOM） material has been prepared by firstly preparation of hybrid 3DOM SiO2-NH2 materials using colloidal crystal method, and following covalent immobilization of glucose oxidase on the pore walls of the 3DOM materials. The materials were characterized by SEM, FTIR, DSC and BET techniques. SEM observation shows that the macropores are highly ordered and are interconnected by small windows. FTIR measurement shows that there are amino and organic groups in the pore walls. The surface area of the 3DOM SiO2-NH2 material is about 10.2 m2/g. The loaded amount of enzyme is increased with amino content in the materials. The immobilized enzyme has high activity, thermal stability and can be reused. 展开更多
关键词 three-dimensionally ordered macropore SiO2 glucose oxidase supported catalyst materials science
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