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首页> 外文期刊>RSC Advances >Facile synthesis of CuMAl (M = Cr, Mn, Zn, and Co) with highly dispersed Cu and tailorable surface acidity for efficient 2-methylpyrazine synthesis
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Facile synthesis of CuMAl (M = Cr, Mn, Zn, and Co) with highly dispersed Cu and tailorable surface acidity for efficient 2-methylpyrazine synthesis

机译：易于合成具有高度分散的Cu和可调节的表面酸度的CuMAl（M = Cr，Mn，Zn和Co），以有效地合成2-甲基吡嗪

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摘要

Synthesis of 2-methylpyrazine (2-MP) from 1,2-propylene glycol (PG) and ethylenediamine (ED) was investigated in the presence of multifunctional catalytic systems (CuMAl) possessing acidic and metallic functional sites. Catalytic systems were prepared from mixed CuMAl-layered double hydroxides (CuMAl-LDHs, M = Cr, Mn, Zn, and Co) via their thermal decomposition. CuMAl-LDH were prepared from Cu(NO3)2, M(NO3)x and Al(NO3)3 and NaOH/Na2CO3 as a precipitating agent. X-ray diffraction (XRD), N2 adsorption–desorption, temperature-programmed desorption with ammonia (NH3-TPD), N2O chemisorption, transmission electron microscopy (TEM), and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) were used to characterize the physical and chemical properties of the catalysts. The results showed that the nature of the secondary metal M inserted into the LDH structure significantly affected the crystalline structure, the dispersion of copper nanoparticles, and the density of surface acidic sites of the catalysts. The as-prepared CuMAl catalysts displayed promising catalytic performances towards the synthesis of 2-MP. Among them, CuCoAl showed the highest PG conversion (97%) and 2-MP selectivity (55%). These high catalytic activities were found to be associated with the ultra-small Cu nanoparticles (～2 nm) and high surface acidity (2433 μmol g?1).
机译：在具有酸性和金属官能位的多功能催化体系（CuMAl）的存在下，研究了由1,2-丙二醇（PG）和乙二胺（ED）合成2-甲基吡嗪（2-MP）。由混合的CuMAl层状双氢氧化物（CuMAl-LDHs，M = Cr，Mn，Zn和Co）通过热分解制备催化体系。 CuMAl-LDH由Cu（NO 3 ） 2 ，M（NO 3 ） x 和Al（NO 3 ） 3 和NaOH / Na 2 CO 3 作为沉淀剂。 X射线衍射（XRD），N 2 吸附解吸，程序升温氨解吸（NH 3 -TPD），N 2 O化学吸附，透射电子显微镜（TEM）和高角度环形暗场扫描透射电子显微镜（HAADF-STEM）以表征催化剂的物理和化学性质。结果表明，插入LDH结构中的仲金属M的性质显着影响了催化剂的晶体结构，铜纳米颗粒的分散性和表面酸性位点的密度。所制备的CuMAl催化剂对2-MP的合成显示出有希望的催化性能。其中，CuCoAl的PG转化率最高（97％），2-MP选择性最高（55％）。发现这些高催化活性与超小Cu纳米颗粒（〜2 nm）和高表面酸度（2433μmolg ？1 ）有关。

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