Hydrodenitrogenation (HDN) reactions of quinoline and its intermediates were carried out at 300-420• C and 2-6 MPa over sulfided NiW/γ -Al 2 O 3 in the absence and presence of H 2 S. The results show that temperature and pressure have a drastic effect on nitrogen removal and production distribution in the HDN of quinoline. 1,2,3,4-tetrahydroquinoline THQ1 mainly underwent dehydrogenation to quinoline and then hydrogenated to 5,6,7,8-tetrahydroquinoline (THQ5), and decahydroquinoline (DHQ) following by ring opening elimination to give 2-propylcyclohexylamine (PCHA) and hydrocarbons. The HDN of THQ5 mainly proceeded the path of DHQ-PCHA, the reactions between THQ5, DHQ, THQ1 and quinoline are so fast that a quasi equilibrium between the four compounds is established quickly at a very low space time. The addition of H 2 S promotes the reaction of DHQ, but retards the pathway of OPA. The promoting effect of H 2 S is dominant at low concentration of H 2 S. However, its inhibiting effect prevails at high concentrations. The HDN via the pathway of DHQ is much easier than OPA over the sulfided NiW/γ -Al 2 O 3 . The HDN of OPA was suppressed by the presence of Q, THQ1, THQ5, and DHQ, maybe due to their stronger adsorption on the catalyst.
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