It has been shown in our previous findings that Mo-, W- and Re-based catalysts promoted with Ni, Co, and K are considered as a promising tri-component catalyst for sour WGS reaction. In order to evaluate the stability of the formed active sulfide and oxysulfidic species at sulfided Mo-, W- and Re-based catalysts at the same surface density of the main component, namely 2 atoms metal/nm² γ-Al₂O₃ support, under influence of oxidizing agents as H₂O steam and CO₂, the WGS reaction was proceeded in absence of sulfur in gas feed. With the intent to enable a quick check, the applied approach was to perform the WGS reaction at high reaction temperature, 400 °C, in H₂S-free syngas and varying the gas hourly space velocity (GHSV). This study gave information about the behaviour of sour molybdenum, tungsten and rhenium WGS catalysts during operation accident. It was found that the active sulfide and oxysulfidic species are more stable in absence of sulfur in feed at tri-component KCoMo and KCoRe catalysts. These catalysts possess lowest sulfur dependence of WGS activity and stability of the deactivation, which is an indication of the applicability of these two systems as optimal sour water–gas shift catalysts.

在我们先前的发现中已经表明，用Ni，Co和K促进的Mo，W和Re基催化剂被认为是酸性WGS反应的有希望的三组分催化剂。为了评价所形成的活性硫醚和硫化钼，W-和oxysulfidic物种的稳定性重新基催化剂在该主要成分的相同的表面密度，即2个原子金属/纳米²的γ-Al ₂ ö ₃支持在氧化剂如H ₂ O蒸汽和CO _{2的影响下}，WGS反应在气体进料中不存在硫的条件下进行。为了能够快速检查，应用的方法是在高反应温度，400°C和H _2中进行WGS反应不含S的合成气，并改变气体时空速度（GHSV）。该研究提供了有关酸性钼，钨和rh WGS催化剂在运行事故期间的行为的信息。发现在三组分KCoMo和KCoRe催化剂中，进料中不存在硫时，活性硫化物和氧硫化物种类更稳定。这些催化剂具有最低的WGS活性硫依赖性和失活稳定性，这表明这两种系统作为最佳酸性水煤气变换催化剂的适用性。