Selective ring opening of phenanthrene over NiW-supported mesoporous HY zeolite catalyst depending on their mesoporosity. (December 2017)

• Record Type: Journal Article
• Authors: Lee, Su-Un; Lee, You-Jin; Kim, Jeong-Rang; Kim, Eun-Sang; Kim, Tae-Wan; Kim, Hyung Ju; Kim, Chul-Ung; Jeong, Soon-Yong
• Is Part Of: Materials research bulletin. Volume 96:Part 3(2017)
• Page Start: 149
• Page End: 154
• Publication Date: 2017-12
• Subjects: A. Microporous materials -- A. Metals -- B. Chemical synthesis -- D. Catalytic properties -- D. Diffusion; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2017.05.002
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: Mesoporous HY zeolites were prepared by pseudomorphic synthesis using TMAOH and CTAB. The mesoporosity of the zeolites increased with the TMAOH concentration. Phenanthrene was selected as a model compound for multi-ring aromatics in heavy oil. NiW/mesoporous HY catalysts were used for selective ring opening of phenanthrene. The proper mesoporosity enhanced the catalytic performance due to ease accessibility. Abstract: Selective ring opening of multi-ring aromatics is a potential route for the production of valuable middle distillates from heavy oil, but a bi-functional (acidic and metallic) catalyst is required. We report here the use of mesoporous HY zeolites with variation of their mesoporosity to overcome diffusion resistance for bulky aromatics. NiW was impregnated on acidic zeolites for the metallic function of the bi-functional catalyst. To investigate the mesoporosity effect on selective ring opening, phenanthrene was selected as a model compound for multi-ring aromatics, and its reaction was conducted in a batch reactor. The introduction of moderate mesoporosity into an HY zeolite resulted in a noticeable effect on the yields of desirable mono-ring aromatics due to the easier accessibility of bulky reactants into the inner active sites of the zeolite. The mesoporosity of the catalyst seems to play an important role in the selective ring opening of phenanthrene but the optimum level should be determined.