title: The Effect of K and Acidity of NiW-Loaded HY Zeolite Catalyst for Selective Ring Opening of 1-Methylnaphthalene.
abstract: Bi-functional catalysts were prepared using HY zeolites with various SiO2/Al2O3 ratios for acidic function, NiW for metallic function, and K for acidity control. 1-Methylnaphthalene was selected as a model compound for multi-ring aromatics in heavy oil, and its selective ring opening reaction was investigated using the prepared bi-functional catalysts with different levels of acidity in a fixed bed reactor system. In NiW/HY catalysts without K addition, the acidity decreased with the SiO2/Al2O3 mole ratio of the HY zeolite. Ni1.1W1.1/HY(12) catalyst showed the highest acidity but slightly lower yields for the selective ring opening than Ni1.1W1.1/HY(30) catalyst. The acidity of the catalyst seemed to play an important role as the active site for the selective ring opening of 1-methylnaphthalene but there should be some optimum catalyst acidity for the reaction. Catalyst acidity could be controlled between Ni1.1W1.1/HY(12) and Ni1.1W1.1/HY(30) by adding a moderate amount of K to Ni1.1W1.1/HY(12) catalyst. K0.3Ni1.1W1.1/HY(12) catalyst should have the optimum acidity for the selective ring opening. The addition of a moderate amount of K to the NiW/HY catalyst must improve the catalytic performance due to the optimization of catalyst acidity.
authors.forename: You-Jin
authors.initials: YJ
authors.lastname: Lee
authors.forename: Eun-Sang
authors.initials: ES
authors.lastname: Kim
authors.forename: Jeong-Rang
authors.initials: JR
authors.lastname: Kim
authors.forename: Joo-Wan
authors.initials: JW
authors.lastname: Kim
authors.forename: Tae-Wan
authors.initials: TW
authors.lastname: Kim
authors.forename: Ho-Jeong
authors.initials: HJ
authors.lastname: Chae
authors.forename: Chul-Ung
authors.initials: CU
authors.lastname: Kim
authors.forename: Chang-Ha
authors.initials: CH
authors.lastname: Lee
authors.forename: Soon-Yong
authors.initials: SY
authors.lastname: Jeong
mesh_terms: D002384:Catalysis; D005648:Fuel Oils; D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D009281:Naphthalenes / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry; D011188:Potassium / Q000737:chemistry*; D014414:Tungsten / Q000737:chemistry; D017641:Zeolites / Q000737:chemistry*
chemical_list: D005648:Fuel Oils; D009281:Naphthalenes; D017641:Zeolites; D009532:Nickel; C025968:1-methylnaphthalene; D011188:Potassium; D014414:Tungsten