CO₂ co-feeding syngas conversion to sustainable fuels and valuable chemicals is one of the promising strategies for partial CO₂ abatement. Surface modifications of Mg promoted CuZn based catalysts via one pot non-ionic surfactant assisted co-precipitation route is an effective approach to facilitate the efficient CO/CO₂ hydrogenation to methanol. Herein, the influence of different surfactant/(CuZnMg) molar ratios on physicochemical properties and in selective methanol promotion was systematically investigated. The mesostructured CuZnMg (I–III) catalysts with varied molar ratios (0–0.06) led to difference in specific surface area, crystallite size, interaction between the lattices and density of basic sites. For the optimized catalyst CuZnMg (III) (molar ratio = 0.06), the CuO crystallite size, specific surface area and basic sites density was 7.2 nm, 31.23 m²/g and 14.6 µmol/m² respectively. Furthermore, the CuZnMg (III) displayed the highest exposed well dispersed CuO species and having strong interaction between Cu and ZnO lattice, as confirmed by H₂-TPR analysis. Hence, CuZnMg (III) exhibited highest total carbon conversion (33.6%) and maximum methanol selectivity (72.5%) under identical reaction conditions (40 bar, 240 °C, 2000 mL/gcat.h). The effect of process parameters on total carbon conversion and methanol selectivity of CuZnMg (III) catalyst was also evidenced. Interestingly, the methanol selectivity and basic sites density correlates linearly with surfactant molar ratios and both were improved by 30% and 16% respectively for CuZnMg (III) catalyst when compared with conventional catalyst, highlighting the potential of surfactant assisted catalyst (CuZnMg (III)) for CO/CO₂ hydrogenation reactions.

Graphic abstract

中文翻译：

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通过一锅非离子型表面活性剂辅助共沉淀路线，将CO 2共进给合成气制甲醇，调节镁助催化剂的理化性质

CO ₂共同进料将合成气转化为可持续燃料和有价值的化学物质是部分减少CO ₂的有前途的战略之一。通过一锅非离子表面活性剂辅助的共沉淀途径对镁促进的CuZn基催化剂进行表面改性是促进有效CO / CO ₂的有效方法加氢成甲醇。在本文中，系统地研究了不同的表面活性剂/（CuZnMg）摩尔比对理化性质和选择性甲醇促进的影响。具有不同摩尔比（0-0.06）的介孔结构CuZnMg（I-III）催化剂导致比表面积，微晶尺寸，晶格之间的相互作用和碱性位点密度的差异。对于优化的催化剂CuZnMg（III）（摩尔比＝ 0.06），CuO微晶尺寸，比表面积和碱性位点密度分别为7.2nm，31.23m ² / g和14.6μmol/ m ²。此外，H ₂证实了CuZnMg（III）表现出最高的分散良好的CuO种类，并且在Cu和ZnO晶格之间具有较强的相互作用。-TPR分析。因此，在相同的反应条件（40 bar，240°C，2000 mL / gcat.h）下，CuZnMg（III）表现出最高的总碳转化率（33.6％）和最大的甲醇选择性（72.5％）。还证明了工艺参数对CuZnMg（III）催化剂的总碳转化率和甲醇选择性的影响。有趣的是，甲醇选择性和碱性位点密度与表面活性剂摩尔比呈线性关系，与常规催化剂相比，CuZnMg（III）催化剂的甲醇选择性和碱性位点密度均分别提高了30％和16％，突出了表面活性剂辅助催化剂（CuZnMg（III） ）用于CO / CO ₂加氢反应。

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