Barr Amel, Benrabaa Rafik, Henni Hayat, Meddour-Boukhobza Laaldja, Roussel Pascal, Löfberg Axel
Laboratory of Materials Chemistry, Catalysis, and Environment (LCMCE), Department of Physics and Chemistry of Inorganic Materials Faculty of Chemistry, USTHB, El-Alia BP 32, Bab Ezzouar, Algiers 16111, Algeria.
Laboratory of Physical Chemistry of Materials, Faculty of Sciences and Technology, Chadli Bendjedid University, El-Tarf BP 73, El-Tarf 36000, Algeria.
Molecules. 2024 Sep 27;29(19):4597. doi: 10.3390/molecules29194597.
CuM and AgM (M = Cr, Fe) catalysts were synthesized, characterized, and evaluated in methane reforming with CO with and without pretreatment under a H atmosphere. Their textural and structural characteristics were evaluated using various physicochemical methods, including XRD, B.E.T., SEM-EDS, XPS, and H-TPR. It was shown that the nature of the species has a significant effect on these structural, textural, and reactivity properties. AgCr catalysts, presenting several oxidation states (Ag, Ag, Cr, and Cr in Ag, AgCrO, and AgCrO), showed the most interesting catalytic performance in their composition. The intermediate CrO phase, formed during the catalytic reaction, played an important role as a catalytic precursor in the in situ production of highly dispersed nanoparticles, being less prone to coke formation in spite of the severe reaction conditions. In contrast, the AgFe catalyst showed low activity and a low selectivity for DRM in the explored temperature range, due to a significant contribution of the reverse water-gas shift reaction, which accounted for the low H/CO ratios.
合成了CuM和AgM（M = Cr、Fe）催化剂，并在有或没有H气氛预处理的情况下，对其在甲烷与CO重整反应中的性能进行了表征和评估。使用包括XRD、B.E.T.、SEM-EDS、XPS和H-TPR在内的各种物理化学方法对它们的织构和结构特征进行了评估。结果表明，物种的性质对这些结构、织构和反应性能有显著影响。具有多种氧化态（Ag、Ag、Cr以及Ag、AgCrO和AgCrO中的Cr）的AgCr催化剂在其组成中表现出最有趣的催化性能。催化反应过程中形成的中间CrO相，作为催化前体在原位生成高度分散的纳米颗粒中发挥了重要作用，尽管反应条件苛刻，但不易形成焦炭。相比之下，由于逆水煤气变换反应的显著贡献，导致H/CO比率较低，AgFe催化剂在探索的温度范围内对DRM表现出低活性和低选择性。
