Ni-REY catalyst

T. Masuda, H. Kuwahara, S. Mukai, and K. Hashimoto, Production of high quality gasoline from waste polyethylene derived heavy oil over Ni-REY catalyst in steam atmosphere, Chem. Eng. Set, 54, 2773-2779 (1999). 

According to this concept, Masuda et al. [75] studied the catalytic cracking of the oil coming from a previous thermal pyrolysis step of polyethylene at 450°C in the bench-scale fixed-bed reactor shown in Figure 3.11. The catalysts employed were different zeolite types REY (rare earth exchanged zeolite Y), Ni-REY (nickel and rare earth... 

Nickel is a well-known catalyst component and is thought to play an important role in the transformation of the hydrogen of steam to hydrocarbons. Hence, a part of the rare earth metal in REY is exchanged with Ni to become prepared Ni and the rare earth metal-exchanged Y-type zeolite catalyst (Ni-REY) [14, 15]. The physical and chemical properties of the catalysts are listed in Table 6.8. The polyethylene plastics-derived heavy oil shown in Table 6.2 was used as the feed oil. 

A continuous-flow, fixed-bed reactor was utilized for the catalytic cracking of the heavy oil. Reactions were conducted under temperature conditions ranging from 300 to 600°C, at a catalyst weight W of about 1.0 x 10 kg and a feed oil mass flow rate F of about 1.0 X 10 kg h In order to examine the catalysis of Ni in Ni-REY for hydrogenation, experiments using hydrogen as the carrier gas were also conducted. 

Figure 6.23 Changes in the catalytic activity of the MFl-type zeolite, Ni-REY, and REY catalysts during the repetition of a sequence of reaction and regeneration (T = 400"C, W/F = 1 h), carrier gas in the reaction nitrogen for MFI, steam for REY and Ni-REY. (Reproduced with permission from Elsevier)...

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