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Thermochemical CO2 and CO2/H2O splitting over NiFe2O4 for solar fuels synthesis

机译：用于太阳能燃料合成的NiFe2O4，热化学CO2和CO2 / H2O分裂

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Within the framework of the recent trend to identify efficient ways of producing solar syngas (CO/H2), the two-step redox based solar thermochemical water dissociation cycle, already employed at a semi-pilot scale for the renewable production of H2, can be modified to include CO2 and/or combined CO2/H2O splitting. The present work relates to Ni-ferrite, as candidate redox material to be employed in Concentrated Solar Power (CSP)-aided thermochemical processes for CO2 and CO2/H2O splitting for the renewable production of CO and syngas respectively. The mixed oxide was synthesized via the Self-propagating High temperature Synthesis (SHS) method and subsequently calcined under air at 1400°C for 1 h. Upon calcination, the material obtained the single phase spinel structure. The material was tested, in the form of powder and as a small cylinder-shaped porous structured body, in a lab-scale fixed bed reactor. The experimental protocol involved a thermal activation step of the material for 1h at 1400°C under N2 flow, the CO2 or CO2/H2O splitting step at 1100°C for 30 min, which resulted in the production of CO or CO/H2 respectively and the thermal reduction step under N2 at 1400°C for 30 min. The effect of CO2 concentration in the feed gas (4%-100%) was investigated in two-cycle experimental runs. In addition, a preliminary durability test was conducted under pure CO2 flow for 8 consecutive splitting and thermal reduction steps. Co-feeding of H2O and CO2 was also conducted for two different compositions; 8%H2O/4% CO2/N2 and 16%H2O/8% CO2/N2). The porous structured body showed somewhat lower yield, in terms of CO2 splitting, compared to the powder.
机译：在近期趋势的框架内，识别太阳能合成气（CO / H2）的有效方式，两步氧化还原基于太阳能热化学水解离循环，已经在半导体规模上用于可再生生产的H2，可以是修饰以包括CO 2和/或组合CO 2 / H2O分裂。本作者涉及Ni-铁氧体，作为候选氧化还原材料，其用于分别用于可再生生产CO和合成气的CO2和CO2 / H2O分裂的浓缩太阳能（CSP）的热化学方法。通过自播高温合成（SHS）方法合成混合氧化物，随后在1400℃下在空气下煅烧1小时。煅烧后，该材料得到单相尖晶石结构。在实验室规模的固定床反应器中，以粉末和小圆柱形多孔结构体的形式测试该材料。实验方案涉及在N 2流动下在1400℃下的材料的热活化步骤1H，CO 2或CO 2 / H 2 O分裂步骤在1100℃下30分钟，导致分别产生CO或CO / H 2在1400℃下N 2下的热还原步骤30分钟。在双循环实验运行中研究了CO 2浓度在进料气中的影响（4％-100％）。此外，在纯CO 2流下进行初步耐久性测试，以进行8个连续分裂和热还原步骤。还对两种不同的组合物进行H 2 O和CO 2的共用; 8％H 2 O / 4％CO 2 / N 2和16％H2O / 8％CO 2 / N 2）。与粉末相比，多孔结构体在二氧化碳分裂方面表现出略低的产率。

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