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Cu/Mg/Al/Zr non-noble metal catalysts for o-phenylphenol synthesis

机译：用于O-苯基苯酚合成的Cu / Mg / Al / Zr非贵金属催化剂

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摘要

Cu/Mg/Al/Zr hydrotalcite-like precursors with Zr ~(4+) :(Al ~(3+) + Zr ~(4+) ) atomic ratios between 0 and 1 were prepared by co-precipitation methods. The precursors were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric (TG) analysis and Fourier transform infrared spectroscopy (FT-IR). The results confirmed that well-defined layered double hydroxides (LDH) can be synthesized when the added Zr content is less than 0.25 in terms of Zr ~(4+) /(Al ~(3+) + Zr ~(4+) ) atomic ratio. The catalysts of Cu/Zn/Al/Zr mixed oxides can be obtained via thermal decomposition of hydroxide precursors, and can be used in dehydrogenation of 2-(1-cyclohexenyl) cyclohexanone (CHCH) to ortho -phenylphenol (OPP). Copper particles inside the catalyst act as active sites for dehydrogenation. Transmission electron microscopy (TEM), XRD, N _(2) O chemisorption and N _(2) adsorption–desorption were performed to investigate the effect of Zr content on determining the copper particle size. Based on the catalytic performance test, it was concluded that the conversion of CHCH depends on the copper particle size of these catalysts.
机译：用Zr〜（4+）的Cu / Mg / Al / Zr水滑石样前体:( Al〜（3+）+ Zr〜（4+））通过共沉淀方法制备0和1之间的原子比。使用X射线衍射（XRD），扫描电子显微镜（SEM），热重分析（TG）分析和傅里叶变换红外光谱（FT-IR）分析前体。结果证实，当在Zr〜（4+）/（Al〜（3+）+ Zr〜（4 +）方面，添加Zr含量小于0.25时，可以合成定义的层状双氢氧化物（LDH）。原子比率。 Cu / Zn / Al / Zr混合氧化物的催化剂可以通过氢氧化物前体的热分解获得，并且可以用于2-（1-环己烯基）环己酮（CHCH）的脱氢至邻苯基苯酚（OPP）。催化剂内的铜颗粒充当活性位点以进行脱氢。进行透射电子显微镜（TEM），XRD，N _（2）o化学吸附和N _（2）吸附 - 解吸，以研究ZR含量对确定铜粒径的影响。基于催化性能试验，得出结论，CHCH的转化取决于这些催化剂的铜粒径。

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