Effect of the nitrogen heterocyclic compounds on hydrodesulfurization using in situ hydrogen and a dispersed Mo catalyst |
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| Authors: | Kun Liu Flora TT Ng |
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| Affiliation: | 1. Samara State Technical University, 244 Molodogvardiyskaya St., Samara 443100, Russia;2. N.D. Zelinsky Institute of Organic Chemistry, RAS, 47 Leninsky prosp., Moscow 119991, Russia;1. Chemistry Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;2. Chemical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;3. Center of Excellence in Nanotechnology (CENT) King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;1. Samara State Technical University, 244 Molodogvardeiskaya St., Samara 443100, Russia;2. Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, Moscow 119991, Russia;1. National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, Fujian, PR China;2. College of Energy, Xiamen University, Xiamen, 361005, Fujian, PR China |
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| Abstract: | The hydrodesulfurization (HDS) of the highly refractory sulfur-containing compounds, dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT), and the effect of the basic and non-basic nitrogen heterocyclic compounds, such as quinoline and carbazole, on HDS using a dispersed unsupported Mo catalyst and in situ generated hydrogen were studied. Experimental results indicated that the dispersed unsupported Mo catalyst was effective for the HDS of 4,6-DMDBT in a mixture containing DBT. The direct desulfurization pathway (DDS) was the preferred pathway for the HDS of DBT while the hydrogenation pathway (HYD) was the preferred pathway for the HDS of 4,6-DMDBT under our experimental conditions. A strong inhibitive effect of the basic quinoline or the non-basic carbazole on the HDS of each of the sulfur-containing compounds was observed. The DDS and HYD pathways in the HDS of the refractory sulfur-containing compounds were affected to a different extent by the nitrogen-containing compounds, suggesting that different active sites were involved in these two reaction pathways. |
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