Coupled hydrogenation and ring opening of tetralin on potassium modified Pt/USY catalysts

Abstract

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.

Catalytic Hydrocracking—Mechanisms and Versatility of the Process

“…The current state of the art has been documented in the recent literature. [95][96][97][98][99][100][101][102][103][104][105][106][107][108][109][110][111] From a mechanistic point of view, this ring opening catalysis is particularly interesting, as it seems to involve elements of both bifunctional hydrocracking and hydrogenolysis on metals.…”

“…% of a noble metal, often platinum or iridium. [98,[100][101][102][103][104] The performance of monofunctional zeolites generally turned out to be unsatisfactory, since the maximal yields of ring opening products were low (less than 20 %), at elevated conversions too high amounts of light hydrocarbons were made, and the catalysts deactivated while on-stream, owing to the build-up of carbonaceous deposits. Bifunctional zeolite catalysts were more promising in that they did not deactivate, and the maximal yields of ring opening products were higher (up to % 30 %, in one exceptional case a yield of ring opening products as high as 60 % has been claimed for decalin hydroconversion on Ir/H-Beta [104] ).…”

“…For example, the ring opening products from decalin or tetralin were usually reported to consist of C 10 naphthenes with a single ring. [100][101][102][103][104] By contrast, extremely scant information is available concerning the formation or not of open-chain decanes. In a few reports the occurrence of decane isomers was qualitatively mentioned.…”

The promotion effects of Pd on Fe–Cu–Co based catalyst for higher alcohols synthesis

“…Therefore, improving the ability of the catalyst for the activation of H 2 is put forward. Platinum group metals, which can effectively activate H 2 at moderate conditions, are widely used in hydrogenation reactions including hydrogenation of reactive molecules, hydrocracking, hydroisomerization, hydrogenation and ring opening, and so on [11][12][13][14][15]. In this paper, we studied the promotion effects of Pd on Fe-Cu-Co based catalyst for higher alcohols synthesis from syngas.…”

Influence of the Brønsted Acidity on the Ring Opening of Decalin for Pt-USY Catalysts.

“…However, these compounds are poor representatives of the LCO composition. To account for this limitation, two-ring probe molecules, such as decalin and tetralin, have been employed [5,13,[16][17][18][19][20][21][22][23][24][25][26][27]. However, even by starting from a single molecule (or two stereoisomers in the case of decalin), a complex mixture of ca.…”