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应用微反、XRD和TPR技术,对水煤气耐硫变换Co-Mo-K—O/γ-Al_2O_3催化剂的性能进行了研究。结果表明,原料气中H_2S的浓度在100～500ppm的实验范围内,催化剂中钾的存在能抑制在操作温度大于250℃后产生的反硫化,显著地提高催化剂的活性。K_2O的含量约在10～12%时为佳。XRD观察到,在硫化态的催化剂上,钾以KHSO_3的形式存在。硫化态的催化剂在TPR谱上有两个被H_2还原峰,表明了低温峰(T_m在200～250℃)为硫化物的还原,高温峰(550℃)则对应于氧化物的还原。
The performance of Co-Mo-K-O / γ-Al_2O_3 catalyst for sulfur-tolerant shift in water gas was studied by means of micro-reverse, XRD and TPR techniques. The results show that the concentration of H 2 S in the feed gas is in the experimental range of 100 ~ 500ppm. The presence of potassium in the catalyst can restrain the anti-sulfurization after the operating temperature is higher than 250 ℃, which can significantly improve the activity of the catalyst. K_2O content of about 10 ~ 12% is better. XRD observed that in the sulfurized catalyst, potassium exists in the form of KHSO_3. There are two H_2 reduction peaks on the TPR spectra of the catalysts in the sulfurized state, indicating that the low temperature peak (Tm at 200 ~ 250 ℃) is the reduction of the sulfide. The high temperature peak (550 ℃) corresponds to the reduction of the oxide.