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大孔Ni/CeO_2催化剂的制备、表征及应用研究 被引量:2
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作者 李凝 王剑锋 +2 位作者 马浩 杨萍 陈富凯 《精细石油化工》 CAS CSCD 北大核心 2018年第5期37-41,共5页
用共沉淀法、硬模板法和胶晶模板法分别制备了Ni/CeO_2催化剂,并用XRD、SEM、BET、TPR、FT-IR等方法对催化剂的晶体结构、表面形貌、比表面积和孔径分布及还原性能等进行了表征,并将其用于生物乙醇重整制氢反应。结果表明,胶晶模板法制... 用共沉淀法、硬模板法和胶晶模板法分别制备了Ni/CeO_2催化剂,并用XRD、SEM、BET、TPR、FT-IR等方法对催化剂的晶体结构、表面形貌、比表面积和孔径分布及还原性能等进行了表征,并将其用于生物乙醇重整制氢反应。结果表明,胶晶模板法制备得Ni/CeO_2催化剂具有较大的比表面积和均匀的孔径分布,在还原过程中产生较多的活性中心。同时用微反色谱装置考察了不同方法制备的Ni/CeO_2催化剂在生物乙醇重整制氢反应中的初活性和抗积碳性能,其中胶晶模板法制备的催化剂在相同的温度条件下具有较好的活性和抗积碳性能。 展开更多
关键词 生物乙醇 重整制氢 镍/二氧化铈 胶晶模板法
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Harnessing the Beneficial Attributes of Ceria and Titania in a Mixed-Oxide Support for Nickel-Catalyzed Photothermal CO_2 Methanation 被引量:2
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作者 Ee Teng Kho Salina Jantarang +2 位作者 Zhaoke Zheng Jason Scott Rose Amal 《Engineering》 SCIE EI 2017年第3期393-401,共9页
Solar-powered carbon dioxide (CO_2)-to-fuel conversion presents itself as an ideal solution for both CO_2 mit- igation and the rapidly growing world energy demand. In this work, the heating effect of light irradiati... Solar-powered carbon dioxide (CO_2)-to-fuel conversion presents itself as an ideal solution for both CO_2 mit- igation and the rapidly growing world energy demand. In this work, the heating effect of light irradiation onto a bed of supported nickel (Ni) catalyst was utilized to facilitate CO_2 conversion. Ceria (CeO_2)-titania (TiO_2) oxide supports of different compositions were employed and their effects on photothermal CO_2 conver- sion examined, Two factors are shown to be crucial for instigating photothermal CO_2 methanation activity: ① Fine nickel deposits are required for both higher active catalyst area and greater light absorption capacity for the initial heating of the catalyst bed; and ② the presence of defect sites on the support are necessary to promote adsorption of C02 for its subsequent activation, Titania inclusion within the support plays a crucial role in maintaining the oxygen vacancy defect sites on the (titanium-doped) cerium oxide. The combination of elevated light absorption and stabilized reduced states for CO_2 adsorption subsequently invokes effective Dhotothermal CO_2 methanation when the ceria and titania are blended in the ideal ratio(s). 展开更多
关键词 PHOTOTHERMAL CO_2 reduction Nickel CERIA Titania
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Promotional effect of cerium on nickel-containing mesoporous silica for carbon dioxide reforming of methane
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作者 Yingyi Fu Yanan Wu +2 位作者 Wenjia Cai Bin Yue Heyong He 《Science China Chemistry》 SCIE EI CAS CSCD 2015年第1期148-155,共8页
A series of Ce-promoted 6.7%Ni-containing mesoporous silica(Ce-Ni-Si O2)with varying Ce content(0.5%–4.8%)was prepared using the evaporation-induced self-assembly method.The characterization results showed that Ce an... A series of Ce-promoted 6.7%Ni-containing mesoporous silica(Ce-Ni-Si O2)with varying Ce content(0.5%–4.8%)was prepared using the evaporation-induced self-assembly method.The characterization results showed that Ce and Ni species were homogeneously incorporated into the mesoporous silica matrix.The catalytic properties of these samples in the dry reforming of methane reaction revealed that the catalysts(e.g.,1.2%Ce-Ni-Si O2)containing highly dispersed small Ni particles exhibited excellent catalytic activity and long-term stability,which is attributed to the anchoring effect of the Ce and its ability to increase surface oxygen species concentration. 展开更多
关键词 dry reforming CE mesoporous silica anchoring effect
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