Efficient conversion of light paraffinic naphtha to aromatics over metal-modified Mo/MFI catalysts

被引:3
|
作者
Qureshi, Ziyauddin S. [1 ]
Ellouh, Mohammed [2 ]
Aitani, Abdullah [1 ]
Akhtar, Muhammad Naseem [1 ]
Jin, Yaming [3 ]
Koseoglu, Omer [3 ]
Alasiri, Hassan [1 ,2 ]
机构
[1] King Fahd Univ Petr & Minerals, Ctr Refining & Adv Chem, Dhahran 31261, Saudi Arabia
[2] King Fahd Univ Petr & Minerals, Dept Chem Engn, Dhahran 31261, Saudi Arabia
[3] Saudi Aramco, R&D Ctr, Dhahran 31311, Saudi Arabia
关键词
Light paraffinic naphtha; Mo-modified MFI; Aromatization; Aromatics; CO-AROMATIZATION; HZSM-5; CATALYSTS; N-HEXANE; GA; PENTANE; ZSM-5; ZN; HYDROCARBONS; METHANE; ALKANES;
D O I
10.1007/s10934-022-01196-3
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The transformation of light naphtha to value-added aromatic compounds is gaining momentum in the petrochemical industry. In this work, a series of metal modified Mo-M/MFI catalysts (M = Fe, Ce, Pt, Ga, and Zn) were synthesized by wet coimpregnation method. Aromatization of light paraffinic naphtha was investigated using modified Mo-M/MFI catalysts at a temperature of 550 degrees C, atmospheric pressure, and WHSV of 0.81 h(-1). Compared to the parent MFI catalyst, the modified bimetallic Mo-Ga/MFI and Mo-Zn/MFI catalysts significantly improved catalytic performance with excellent selectivity (62 wt%) for BTEX (benzene, toluene, ethylbenzene and xylenes) along with 5.4 to 0.6 wt% of C9+ aromatics and ratio of toluene/benzene 0.5 and 0.6, respectively. The higher selectivity to aromatic is attributable to two important factors, the acidity of zeolites and the improved dehydrogenation activity of Mo and the M-modifier. These species effectively transform light naphtha to olefins and then to aromatics by secondary reactions (e.g. isomerization, cracking, dimerization etc.). The modified Mo-Zn/MFI bimetallic catalyst exhibited good stability and selectivity to aromatics with lower ratio of toluene/benzene i.e. similar to 0.6.
引用
收藏
页码:683 / 692
页数:10
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