Co_xO_y–manganese carbonate (X%)(Co_xO_y–MnCO₃ catalysts (X = 1–7)) were synthesized via a straightforward co-precipitation strategy followed by calcination at 300 °C. Upon calcination at 500 °C, these were transformed to Co_xO_y–dimanganese trioxide i.e., (X%)Co_xO_y–Mn₂O₃. A relative catalytic evaluation was conducted to compare the catalytic efficiency of the two prepared catalysts for aerial oxidation of benzyl alcohol (BzOH) to benzaldehyde (BzH) using O₂ molecule as a clean oxidant without utilizing any additives or alkalis. Amongst the different percentages of doping with Co_xO_y (0–7% wt./wt.) on MnCO₃ support, the (1%)Co_xO_y–MnCO₃ catalyst exhibited the highest catalytic activity. The influence of catalyst loading, calcination temperature, reaction time, and temperature and catalyst dosage was thoroughly assessed to find the optimum conditions of oxidation of benzyl alcohol (BzOH) for getting the highest catalytic efficiency. The (1%)Co_xO_y–MnCO₃ catalyst which calcined at 300 °C displayed the best effectiveness and possessed the largest specific surface area i.e., 108.4 m²/g, which suggested that the calcination process and specific surface area play a vital role in this transformation. A 100% conversion of BzOH along with BzH selectivity >99% was achieved after just 20 min. Notably, the attained specific activity was found to be considerably larger than the previously-reported cobalt-containing catalysts for this transformation. The scope of this oxidation reaction was expanded to various alcohols containing aromatic, aliphatic, allylic, and heterocyclic alcohols without any further oxidation i.e., carboxylic acid formation. The scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and Brunauer–Emmett–Teller (BET) specific surface area analytical techniques were used to characterize the prepared catalysts. The obtained catalyst could be easily regenerated and reused for six consecutive runs without substantial decline in its efficiency.

中文翻译：

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CoxOy-MnCO3和CoxOy-Mn2O3催化剂的合成和表征：对各种醇进行空气氧化的比较催化评估

Co _x O _y-碳酸锰（X％）（Co _x O _y -MnCO ₃催化剂（X = 1-7））是通过直接共沉淀策略随后在300°C下煅烧合成的。在500°C下煅烧后，将其转化为Co _x O _y-三氧化二锰，即（X％）Co _x O _y -Mn ₂ O ₃。进行了相对催化评估，比较了两种制备的催化剂对使用O ₂将苄醇（BzOH）空气氧化为苯甲醛（BzH）的催化效率。分子作为清洁氧化剂，无需使用任何添加剂或碱。在MnCO ₃载体上不同百分比的Co _x O _y掺杂（0–7％wt./wt。）中，（1％）Co _x O _y -MnCO ₃催化剂表现出最高的催化活性。彻底评估了催化剂负载量，煅烧温度，反应时间，温度和催化剂用量的影响，以找到最佳的氧化苄醇（BzOH）的条件，以获得最高的催化效率。（1％）Co _x O _y –MnCO ₃在300°C下煅烧的催化剂显示出最佳效果，并具有最大的比表面积，即108.4 m ²/ g，这表明煅烧过程和比表面积在此转化过程中起着至关重要的作用。仅20分钟后，BzOH的转化率就达到了100％，BzH的选择性> 99％。值得注意的是，发现该转化所获得的比活性比先前报道的含钴催化剂大得多。该氧化反应的范围扩大到包含芳族，脂族，烯丙基和杂环醇的各种醇，而没有任何进一步的氧化即形成羧酸。扫描电子显微镜（SEM），能量色散X射线光谱（EDS），X射线衍射（XRD），傅立叶变换红外光谱（FTIR），热重分析（TGA），用布鲁诺尔-埃默特-泰勒（BET）比表面积分析技术来表征所制备的催化剂。所获得的催化剂可以容易地再生并重复使用六次，而效率没有明显下降。