Series of nanosized iron- and cobalt-doped ceria–zirconia nanocomposites were prepared using a hydrothermal synthesis technique at 180 °C for 24 h, with the successful novel incorporation of both Co and Fe on ceria–zirconia, for n-hexane catalytic cracking. Effects of dopant ions on the improvement of intrinsic properties of ceria–zirconia nanocomposites were investigated using disparate characterization techniques. The synthesized ceria–zirconia nanocomposites exhibited similar X-ray diffraction (XRD) patterns, indicating full fusion of the metal ions into the ceria–zirconia lattice structure. The synthesized nanocomposite catalysts were tested for n-hexane cracking over 10 h time-on-stream, with no previous study or report for catalytic cracking of hexane via ceria–zirconia nanocomposites. Relatively high ethylene and propylene selectivity (both >62%) was obtained over CZ, FeCoCZa, and FeCoCZb over time-on-stream. Comparatively, the best catalytic activity and stability was exhibited by FeCoCZa with higher n-hexane conversion. Temperature and catalyst weight per feed flow rate (W/F) variations were investigated using the best catalyst (FeCoCZa). Higher conversions were obtained at higher temperature and lower W/F but with varied product selectivity and yield, over time-on-stream. In addition, the spent catalysts were successfully regenerated after catalytic testing via calcination at 600 °C for 4 h and reused for two additional cycles.

中文翻译：

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铁和钴掺杂的二氧化铈-氧化锆纳米复合材料可催化裂化具有再生能力的石脑油

使用水热合成法在180℃下24小时，制备纳米尺寸铁基和钴掺杂的二氧化铈-氧化锆纳米复合材料的系列，对二氧化铈-氧化锆Co和Fe的成功新颖掺入用于Ñ正己烷催化裂化。使用不同的表征技术研究了掺杂离子对改善二氧化铈-氧化锆纳米复合材料内在性能的影响。合成的二氧化铈-氧化锆纳米复合材料表现出相似的X射线衍射（XRD）模式，表明金属离子完全融合到二氧化铈-氧化锆的晶格结构中。测试了合成的纳米复合催化剂的n己烷在运行10小时内裂解，没有以前的研究或报道通过二氧化铈-氧化锆纳米复合材料催化裂解己烷。在生产时间内，在CZ，FeCoCZa和FeCoCZb上获得了较高的乙烯和丙烯选择性（均> 62％）。相比较而言，最好的催化活性和稳定性是通过FeCoCZa具有较高显示Ñ正己烷转化率。使用最佳催化剂（FeCoCZa）研究了温度和催化剂重量/进料流量（W / F）的变化。在较高的温度和较低的W / F下获得较高的转化率但随着生产时间的推移，产品的选择性和收率会有所不同。此外，用过的催化剂在600°C下煅烧4 h进行催化测试后，已成功地再生了废催化剂，并再次使用了另外两个周期。