Abstract

A number of metal sulfide catalysts were synthesized by hydrogen treatment of nickel, cobalt, copper, and iron sulfates supported on γ-Al₂O₃ (with a metal content of 5% and 10%). The resultant materials catalyze the decarbonylation of stearic acid to the corresponding higher olefins in the presence of hydrogen. The yield of target products decreases in the following order: Ni, Co > Cu > Fe. In the nickel and cobalt catalysts, X-ray diffraction (XRD) analysis identified interplanar distances (d-spacings) attributable to Ni₃S₂ and Co₉S₈. Such sulfides are likely responsible for their performance in decarbonylation. Hydrogen pretreatment time was found to be a factor that affects the activity of nickel and cobalt catalysts. XPS examination showed a decline in the sulfide sulfur to metal atomic ratio with an extension of hydrogen treatment time. The optimal time was found to range from 1 to 3 h.

中文翻译：

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金属和用于合成负载型催化剂的方法对脂肪酸制烯烃催化性能的影响

摘要

_{通过对负载在 γ-Al 2} O ₃（金属含量为 5% 和 10%）上的镍、钴、铜和铁的硫酸盐进行氢处理，合成了许多金属硫化物催化剂。所得材料在氢气存在下催化硬脂酸脱羰为相应的高级烯烃。目标产物的收率按以下顺序递减：Ni、Co > Cu > Fe。在镍和钴催化剂中，X 射线衍射 (XRD) 分析确定了可归因于 Ni ₃ S ₂和 Co ₉ S _{8的晶面间距 (} d-间距). 这种硫化物可能是其脱羰性能的原因。发现氢气预处理时间是影响镍和钴催化剂活性的一个因素。XPS 检测显示硫化物硫与金属的原子比随着氢处理时间的延长而下降。发现最佳时间范围为 1 至 3 小时。