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Solution synthesis of unsupported Ni–W–S hydrotreating catalysts was studied, in which WO2S22- core reacted with Ni 2+ ions, eventually in the presence of organic surfactant. The products were characterized by X-ray powder diffraction, low-temperature nitrogen adsorption, transmission electron microscopy and extended X-ray absorption fine structure spectroscopy. Catalytic activity of Ni–W–S...
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