摘要
采用浸渍法将K添加到氢氧化铁中获得不同K/Fe原子比催化剂,用KnFe表示,其中n=0,0.02,0.04,0.08,0.40,1.00。利用XRD,FT-IR,Raman,TG和元素分析等表征手段研究K/Fe原子比对其反应性能及积炭行为的影响。结果表明:适量K能够促进铁基催化剂CO加氢反应,提高C_2~=~C_4~=选择性,而过量K又会抑制CO加氢反应,降低烯烃选择性,最佳n(K)/n(Fe)为0.04;K的添加促进类石墨型积炭的生成,导致催化剂稳定性下降;随n增加,催化剂积炭量逐渐增加,且积炭中脂肪化程度以及H/C比均增加。
The catalyst samples with different K/Fe atomic ratios were prepared by doping K on the ferric hydroxide precipitate, denoted as Kn Fe （n represents 0,0.02,0.04,0.40,0.80 and 1.00, respec- tively） and characterized by XRD, FT-IR, Raman, TG-DTG, and element analysis. The effects of K/Fe on carbon deposition characteristics and reaction activity were investigated. The results show that the addi- tion of potassium can improve the performance for CO hydrogenation to light olefins and increase the se- lectivity of C2-C4. The best K/Fe atomic ratio in this paper is n= 0.04. However, excessive addition of potassium have an opposite effects. The addition of potassium is more advantageous to the generation of graphite like coke which may leads to decrease the activity and the stability of the catalyst. Meanwhile, with the increase of K/Fe atomic ratio, the amount of carbon deposition increases gradually, and the level of fat and H/C mole ratio in coke is increased.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2017年第3期63-67,共5页
Petroleum Processing and Petrochemicals
基金
内蒙古自治区自然科学基金项目(2015BS0206)
内蒙古科技大学创新基金项目(2015QDL09)
内蒙古自治区重大基础研究开放课题
