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首页> 外文期刊>Catalysis science & technology >Promoting effect of Ce on a Cu-Co-Al catalyst for the hydrogenolysis of glycerol to 1,2-propanediol
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Promoting effect of Ce on a Cu-Co-Al catalyst for the hydrogenolysis of glycerol to 1,2-propanediol

机译：促进作用的Ce Cu-Co-Al催化剂甘油氢解作用的1,2-propanediol

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摘要

In this work, a series of Cu-Co-Al catalysts with different Ce loadings were applied to the hydrogenolysis of glycerol to 1,2-propanediol in a fixed-bed flow reactor. The physicochemical properties of the synthesized catalysts were analyzed using BET, N2O chemisorption, SEM, TEM, XRD, H-2-TPR, NH3-TPD and XPS techniques. Systematic characterization demonstrated that the incorporation of Ce into the Cu-Co-Al catalyst could effectively restrain the aggregation of active metal species as well as the growth of metallic particles during calcination and reduction, which resulted in the formation of highly dispersed active metals. Large amounts and superior strength of acid sites were present in the Ce-promoted Cu-Co-Al catalysts, as confirmed by NH3-TPD analysis. The reducible nature of the Cu-Co-Al catalyst greatly increased after the addition of Ce. The higher concentration of acid sites, excellent reducibility and highly dispersed active metals were responsible for the superior catalytic activity of the 8Ce/Cu-Co-Al catalyst and it attained 91.6% glycerol conversion and 92.4% 1,2-propanediol selectivity. In addition, the effects of different process parameters such as the solvent, reaction temperature, operating pressure, catalyst loading, glycerol concentration and liquid flow rate on glycerol hydrogenolysis together with the catalyst stability were studied in detail, showing that the Ce-promoted Cu-Co-Al catalyst had high efficiency and stability for glycerol hydrogenolysis.
机译：在这个工作中,一系列Cu-Co-Al催化剂不同的Ce载荷应用于的甘油氢解作用,2-propanediol固定床流动反应器。合成催化剂的属性分析使用打赌,一氧化二氮化学吸收作用,SEM, TEM,XRD、H-2-TPR NH3-TPD和XPS技术。系统的表征证明了公司的Ce Cu-Co-Al催化剂能有效地抑制聚合的活性金属物种的生长在煅烧和金属颗粒减少,导致的形成高度分散的活性金属。优越的酸强度网站中的Ce-promoted Cu-Co-Al催化剂,如确认由NH3-TPD分析。Cu-Co-Al催化剂后大大增加Ce。网站,优秀的还原性和高度分散的活性金属负责8 ce / Cu-Co-Al优越的催化活性达到91.6%甘油催化剂转换和92.4% 1,2-propanediol选择性。此外,不同过程的影响参数如溶剂、反应温度、操作压力、催化剂加载、甘油浓度和液流对甘油氢解作用的催化剂的稳定性进行了研究,显示Ce-promoted Cu-Co-Al催化剂效率高、稳定了甘油氢解作用。

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