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The nature of the deactivation of hydrothermally stable Ni/SiO2–Al2O3 catalyst in long-time aqueous phase hydrogenation of crude 1,4-butanediol 认领 引用 被引量：4
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作者 Haitao Li Yin Zhang +5 位作者 Hongxi Zhang Xiaoqin Qin Yalin Xu RuifangWu Zheng Jiang Yongxiang Zhao 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第12期2960-2967,共8页
The deactivation of Ni/SiO2-Al2 O3 catalyst in hydrogenation of crude 1,4-butanediol was investigated.During the operation time of 2140 h,the catalyst showed slow activity decay.Characterization results,for four spent... The deactivation of Ni/SiO2-Al2 O3 catalyst in hydrogenation of crude 1,4-butanediol was investigated.During the operation time of 2140 h,the catalyst showed slow activity decay.Characterization results,for four spent catalysts used at different time,indicated that the main reason of the catalyst deactivation was the deposition of carbonaceous species that covered the active Ni and blocked mesopores of the catalyst.The TPO and SEM measurements revealed that the carbonaceous species included both oligomeric and polymeric species with high C/H ratio and showed sheet.Such carbonaceous species might be eliminated through either direct H2 reduction or the combined oxidation-reduction methodologies. 展开更多
关键词 1,4-Butanediol Hydrogenation Ni/SiO2–Al2O3 catalyst Deactivation Regeneration
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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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助剂对Ni/SiO2催化剂1,4-丁炔二醇加氢性能的影响 认领 引用 被引量：3
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作者 王菊霞 刘琳丽 +4 位作者 徐亚琳 王长真 张鸿喜 李海涛 赵永祥 《工业催化》 CAS 2019年第8期91-97,共7页
通过分步浸渍法在Ni/SiO 2催化剂中分别引入Zn、Cu、La、Mo、Co金属助剂,结合N 2物理吸附-脱附、XRD、H 2-TPR和NH 3-TPD等表征手段研究金属助剂对1,4-丁炔二醇加氢性能的影响。结果发现,Mo的引入使Ni/SiO 2催化剂的初始活性大幅增加,... 通过分步浸渍法在Ni/SiO 2催化剂中分别引入Zn、Cu、La、Mo、Co金属助剂,结合N 2物理吸附-脱附、XRD、H 2-TPR和NH 3-TPD等表征手段研究金属助剂对1,4-丁炔二醇加氢性能的影响。结果发现,Mo的引入使Ni/SiO 2催化剂的初始活性大幅增加,但反应2 h后活性下降,归因于催化剂表面酸中心使催化剂积炭失活;引入Cu、La及Co后的催化剂活性较低,推测是由于催化剂表面产生强吸附氢物种,不利于1,4-丁炔二醇加氢反应进行;与其他样品相比,Zn的引入使催化剂保持了Ni/SiO 2催化剂高的1,4-丁炔二醇加氢活性,同时可有效降低产物中2-羟基四氢呋喃副产物含量,提高目标产物1,4-丁二醇收率。 展开更多
关键词 催化剂工程 1,4-丁炔二醇 加氢 Ni/SiO2催化剂 金属助剂
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TPD法研究Ni-W/F-Al_2O_3-SiO_2催化剂的酸性 认领 引用
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作者 朱建军 林西平 +1 位作者 谭其群 侯学洪 《常州大学学报（自然科学版）》 CAS 1996年第2期6-9,共4页
采用TPD法在排除了再吸附现象的条件下，研究了F含量对Ni－W／F－Al2O3—SiO2催化剂酸性的影响，并将测定结果与Hammett指示剂法测定结果进行了关联，结果表明，F对该催化剂两种不同强度的酸性中心具有不同程度的影响，F含量的变化对催... 采用TPD法在排除了再吸附现象的条件下，研究了F含量对Ni－W／F－Al2O3—SiO2催化剂酸性的影响，并将测定结果与Hammett指示剂法测定结果进行了关联，结果表明，F对该催化剂两种不同强度的酸性中心具有不同程度的影响，F含量的变化对催化剂弱酸中心的酸强度和酸浓度无显著的影响，而对催化剂强酸中心的影响较大，当F含量为1．5％左右时其酸度具有极大值，且随着F含量的增加，强酸中心的酸强度逐渐增强。 展开更多
关键词 TPD 再吸附 Ni-W/F—Al2O3-SiO2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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