Coupled hydrogenation and ring opening of tetralin on potassium modified Pt/USY catalysts
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Catalysis Letters, Vol. 116, Nos. 3–4, August 2007 ( 2007) DOI: 10.1007/s10562-007-9103-z
Coupled hydrogenation and ring opening of tetralin on potassium modified Pt/USY catalysts Huaijun Ma,a,b Xiaomei Yang,a,b Guodong Wen,a,b Ge Tian,a,b Lei Wang,a,b Yunpeng Xu,a Bingchun Wang,a,b Zhijian Tian,a,* and Liwu Lina,c a
Laboratory of Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, P.R. China b Graduate School of Chinese Academy of Sciences, Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, P.R. China c State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, P.R. China
Received 25 March 2007; accepted 25 March 2007
Coupled hydrogenation and ring opening of tetralin (THN) on Pt/USY catalyst were performed on a high-pressure fixed-bed reactor. The effect of reaction temperature in range of 100–300 C and the nature of the catalyst (metal and acid sites) on the catalytic performance were studied. The results indicated that the extent of hydrocracking, a sequential reaction of ring opening, should be reduced in order to maintain high yields of the ring opening products (ROP). Introduction of the Pt component accelerated the hydrogenation and ring opening of the THN significantly. It was also found to be an effective way to optimize the acid properties of the catalysts by introducing an appropriate amount of potassium to the catalyst, such that the strong acid sites of the catalysts were diminished, and a higher ROP yield could be obtained as a result of the inhibiting of the hydrocracking activity of the catalyst. When the yield of the C10 fractions could be maintained at 90 wt.%, then a maximal ROP yield of 35.6 wt.% could be obtained on a 0.5 wt.% Pt/USY catalyst loaded with 2.0 wt.% of K. KEY WORDS: tetralin; decalin; hydrogenation; ring opening; Pt/USY; diesel.
1. Introduction Too high aromatic contents in diesel fuels have been recognized as detrimental both in lowering the fuel qualities and in contributing significantly to the formation of undesirable tailpipe emissions [1–3]. For the sake of environment protection, more stringent legislations associated with clean fuels have been made [2,4]. Key product requirements for diesel range distillates include an ultra-low-sulfur content and a low polynuclear aromatic concentration [5]. Therefore, the light cycle oils (LCO) of FCC containing 60–70 vol.% aromatics [6] cannot be used directly as accession for diesels. Accordingly, the removal of polynuclear aromatics and the enhancement of cetane numbers of diesel fuels become the focal point of intense researches [4–6]. Commercially, two technologies are being employed for improving diesel qualities by the removal of polynuclear aromatics, aromatic saturation (ASAT) and hydrocracking [1,2,5]. However, both of them have some limitations [5]. An interesting and alternative technology for improving the cetane number of diesels and maintaining meanwhile high diese
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