Abstract A new species’ class of Cu-, Ga- and Zn-based rate catalysts was prepared by a systematic co-precipitation technique at the different related pH values (6.5–8.0) along with calcination functional conditions, influencing components’ physical properties, these were characterized, and their application performance for water–gas shift (WGS) reaction was researched. Substances were analysed by various experimental methods, namely chemisorption, temperature-programmed reduction (TPR) characterisation, diffraction, physisorption and microscopy. A homogenous size dispersion of the compounds with smaller granular particles was obtained for catalysis, implemented with high pH-resulting outputs. H2 TPR profiles revealed a tailored stronger effect of Cu–Zn on Ga for process, operated with low pH-conditioned forms. Over Cu/ZnGaOX, WGS was sensitive to Cu, which was primarily active. Catalytic chemical reactivity, activity and selectivity were also found to be critically dependent on material lattice structure, copper surface area and metal–support interaction phenomena. The temperature-programmed surface reaction with mass spectrometry (TPSR–MS) measurements showed that formulations, synthesised at the pH of 8.0, enabled reaching >99% of the equilibrium yield CO conversion at 260 °C. An increase in the converted CO, oxidation and H2 productivity with the integral steam content in gaseous feed flow was achieved. The heterogeneous phase processing at the correlated pH of 7.6 demonstrated the highest formed CO product at the temperature of 200 °C, compared with literature. This is particularly promising for reagent purity hydrogen-fed fuel cells. The kinetics for each co-precipitated solid was evaluated regarding the efficiency for the WGS in a fixed bed reactor.

中文翻译：

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Cu/ZnGaO 催化剂在用于生产氢燃料的低温水煤气变换 (WGS) 反应中的表面结构-活性关系

摘要 通过系统共沉淀技术在不同的相关 pH 值（6.5-8.0）以及煅烧功能条件下制备了一类新的 Cu-、Ga- 和 Zn 基速率催化剂，影响组分的物理性质，对这些进行了表征，并研究了它们在水煤气变换 (WGS) 反应中的应用性能。通过各种实验方法分析物质，即化学吸附、程序升温还原 (TPR) 表征、衍射、物理吸附和显微镜。获得了具有较小颗粒颗粒的化合物的均匀尺寸分散体，用于催化，实现了高 pH 值输出。H2 TPR 曲线揭示了 Cu-Zn 对 Ga 的定制更强影响，以低 pH 条件形式操作。在 Cu/ZnGaOX 之上，WGS 对 Cu 敏感，主要是活性的。还发现催化化学反应性、活性和选择性严重依赖于材料晶格结构、铜表面积和金属-载体相互作用现象。程序升温表面反应与质谱 (TPSR-MS) 测量表明，在 8.0 的 pH 值下合成的配方能够在 260°C 下达到 >99% 的平衡产率 CO 转化率。随着气体进料流中整体蒸汽含量的增加，转化的 CO、氧化和 H2 生产率得以提高。与文献相比，相关 pH 值为 7.6 的异相处理表明，在 200 °C 温度下形成的 CO 产物最高。这对于试剂纯度的氢燃料电池尤其有希望。