合成气直接制低碳烯烃中K对铁基催化剂积炭特性的影响

石油炼制与化工 ›› 2017, Vol. 48 ›› Issue (3): 63-67.

合成气直接制低碳烯烃中K对铁基催化剂积炭特性的影响

段建国¹,王亚雄¹,刘全生^2,周晨亮¹

1. 内蒙古科技大学化学与化工学院，内蒙古煤化工与煤炭综合利用重点实验室
2. 内蒙古工业大学化工学院，内蒙古自治区低阶碳质资源高值功能化利用重点实验室

收稿日期:2016-09-09 修回日期:2016-11-10 出版日期:2017-03-12 发布日期:2017-02-24
通讯作者: 周晨亮 E-mail:627063044@qq.com
基金资助:
内蒙古自治区自然科学基金项目;内蒙古科技大学创新基金项目

EFFECT OF POTASSIUM ON CARBON DEPOSITION CHARACTERISTICS OF IRON-BASED CATALYST DURING DIRECT CONVERSION OF SYNGAS TO LIGHT OLEFINS

Received:2016-09-09 Revised:2016-11-10 Online:2017-03-12 Published:2017-02-24
Supported by:

摘要/Abstract

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=0，0.02，0.04，0.08，0.4，1.0。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C2=~C4=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。

关键词: K/Fe原子比, 积炭, 合成气, 低碳烯烃

Abstract: 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, respectively) 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 addition of potassium can improve the performance for CO hydrogenation to light olefins and increase the selectivity 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.

Key words: Fe/K atomic ratio, carbon deposite, syngas, light olefins

中图分类号:

段建国王亚雄刘全生周晨亮. 合成气直接制低碳烯烃中K对铁基催化剂积炭特性的影响[J]. 石油炼制与化工, 2017, 48(3): 63-67.

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