Gold-based nanocatalysts have proved to be an appropriate candidate for the selective preferential CO oxidation (PROX) in H₂-containing atmosphere. Effectiveness of small gold nanoparticles in the presence of immobilized on GO–CeO₂ nanocomposites was investigated by a range of ball milling conditions for the PROX reaction. First, GO–CeO₂ nanocomposites were fabricated using the combination of ball milling and hydrothermal methods, and then, the gold nanocomposites were activated at 400 ± 2 °C for 4 h in Ar atmosphere. Next, Au/GO–CeO₂ catalysts were synthesized, and after that, the gold nanocontents calcined at 400 ± 2 °C in Ar gas during 4 h. The catalytic activity and selectivity of activated gold catalysts (Au/GO–CeO₂) were studied for the preferential CO oxidation at optimized conditions from the ambient temperature to 175 ± 2 °C. The gas and vapor phase components were analyzed by a Fourier Transform Infrared Spectroscopy. The effects of ball mill’s parameters, such as milling time, bead amounts, loading percentage, and milling temperatures, on the catalytic activity and selectivity of gold catalysts were investigated. Under relatively optimized conditions, the results showed the high conversion (C%: 97) and selectivity (S%: 92) for the gold nanocatalysts at 150 °C reaction time towards CO₂ as the main product when the Au/GO–CeO₂ nanocatalysts were synthesized by the use of 12% of GO solution with 90 zirconia oxide balls at 70 °C for 8 h of the ball milling condition.

金基纳米催化剂已被证明是在含H ₂的气氛中进行选择性优先CO氧化（PROX）的合适候选者。通过一系列球磨条件进行PROX反应，研究了固定在GO–CeO ₂纳米复合材料上的小金纳米颗粒的有效性。首先，采用球磨和水热法相结合的方法制备GO–CeO ₂纳米复合材料，然后在Ar气氛中将金纳米复合材料在400±2°C的温度下活化4 h。接下来，合成了Au / GO-CeO ₂催化剂，然后，在4 h内于Ar气中以400±2°C的温度煅烧了金纳米含量。活性金催化剂（Au / GO–CeO ₂的催化活性和选择性）研究了在最佳条件下（从环境温度到175±2°C）的优先CO氧化。气相和气相成分通过傅立叶变换红外光谱法分析。研究了球磨机的参数，例如研磨时间，珠粒量，负载百分比和研磨温度，对金催化剂的催化活性和选择性的影响。在相对优化的条件下，结果表明，在Au / GO–CeO _{2的作用下}，金纳米催化剂在150°C的反应时间对以CO ₂为主要产物的反应具有较高的转化率（C％：97）和选择性（S％：92）。 纳米球催化剂是在70℃的球磨条件下，使用12％的GO溶液与90氧化锆球合成的。