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Cyclohexane oxidation over AFI molecular sieves: effects of Cr, Co incorporation and crystal size

机译:AFI分子筛上的环己烷氧化:CR,CO掺入和晶体大小的影响

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摘要

Heteroatom substituted AFI molecular sieves with different sizes and morphologies were synthesized under hydrothermal conditions and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis diffuse reflectance spectroscopy (UV-vis), Fourier transform infrared spectroscopy (FT-IR), N-2 adsorption/desorption isotherm measurement, inductively coupled plasma-optical emission spectrometry (ICP-OES) and thermogravimetric analysis (TG-DTG). Uniformly sized plate-like crystals as thin as 400 nm were prepared using a seed inducing method. Cr and Co ions were introduced into the molecular sieves and some of them were transformed to the high-valence state through calcination. In the reaction of cyclohexane oxidation, bimetal substituted AlPO4-5 exhibited higher catalytic activities than single metal substituted analogues although the doping amount is lower. The improvement of diffusion efficiency resulting from the shortening of the channels along the c-axis increased the conversion of cyclohexane
机译:在热液条件下合成具有不同大小和形态的杂种替代的AFI分子筛子,并通过X射线衍射(XRD),扫描电子显微镜(SEM),UV-VIS弥漫性反射率(UV-VIS),傅立叶转化基础光谱法(傅立叶衍射反射率(UV-VIS),傅立叶衍射显微镜(SEM),傅立叶衍射显微镜(SEM),傅立叶差异型基础型基础镜,傅立叶散射型漏洞(XRD),傅立叶差异。 ft-ir),N-2吸附/解吸等温线测量,电感耦合等离子光光谱(ICP-OES)和热重分析(TG-DTG)。使用种子诱导方法制备了均匀尺寸的板状晶体。将CR和CO离子引入分子筛子中,其中一些通过钙化转化为高价态。在环己烷氧化的反应中,双替代的Alpo4-5表现出比单金属取代类似物更高的催化活性,尽管掺杂量较低。沿C轴缩短通道导致的扩散效率的提高增加了环己烷的转化

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