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Transition metal-containing catalysts and catalyst combinations including transition metal-containing catalysts and processes for their preparation and use as oxidation catalysts
Transition metal-containing catalysts and catalyst combinations including transition metal-containing catalysts and processes for their preparation and use as oxidation catalysts
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机译:含过渡金属的催化剂和催化剂组合,包括含过渡金属的催化剂及其制备和用作氧化催化剂的方法
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摘要
The invention relates to a process for oxidizing N-(phosphonomethyl)iminodiacetic acid or a salt thereof, comprising contacting N-(phosphonomethyl)iminodiacetic acid or a salt thereof with an oxidant in the presence of a transition metal containing catalyst.The catalyst comprises a carbon support having formed thereon a transition metal composition comprising a transition metal (M) and nitrogen. The catalyst carbon support has a Langmuir surface area of from about 500 m 2 /g to about 2100 m 2 /g,the transition metal constitutes between 1.6% and 5% by weight of the catalyst. The catalyst is further characterized such that, when the catalyst is analyzed by X-Ray Photoelectron Spectroscopy (XPS) (i) the N 1s spectra includes a component having a binding energy of from about 398.4 eV to about 398.8 eV, and (ii) the Co 2p spectra includes a component having a binding energy of from about 778.4 eV to about 778.8 eV; or as generating ions corresponding to the formula MN x C y + when the catalyst is analyzed by Time-of-Flight Secondary Ion Mass Spectrometry (ToF SIMS) as described in Protocol A; the weighted molar average value of x being from about 0.5 to about 8 and the weighted molar average value of y being from about 0.5 to about 8.
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机译:本发明涉及一种氧化N-(膦酰基甲基)亚氨基二乙酸或其盐的方法,该方法包括在含过渡金属的催化剂存在下使N-(膦酰基甲基)亚氨基二乙酸或其盐与氧化剂接触。碳载体上形成了包含过渡金属(M)和氮的过渡金属组合物。催化剂碳载体的朗缪尔表面积为约500m 2 / g至约2100m 2 / g,过渡金属占催化剂重量的1.6%至5%。催化剂的特征还在于,当通过X射线光电子能谱法(XPS)分析催化剂时,(i)N 1s光谱包括具有约398.4eV至约398.8eV的结合能的组分,和(ii) Co 2p光谱包括结合能为约778.4eV至约778.8eV的组分。或如协议A中所述,通过飞行时间二次离子质谱(ToF SIMS)分析催化剂时,产生与式MN x C y +相对应的离子; x的加权摩尔平均值为约0.5至约8,y的加权摩尔平均值为约0.5至约8。
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