Citation: XU Xiao-Ling, LI Chun-Yi, SHAN Hong-Hong. Novel Modified Magnesium-Aluminate Spinels as Potential FCC Matrix Components[J]. Acta Physico-Chimica Sinica, ;2011, 27(08): 1947-1955. doi: 10.3866/PKU.WHXB20110837 shu

Novel Modified Magnesium-Aluminate Spinels as Potential FCC Matrix Components

1.
State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266555, Shandong Province, P. R. China

Received Date: 30 March 2011
Available Online: 28 June 2011
Fund Project:

Modified magnesium-aluminate spinels (MgAl₂O₄) were prepared by recrystallizing a mixture of MgAl₂O₄ and zeolite Y nanoclusters in acidic medium to improve the acidity of MgAl₂O₄, which was commonly used as a sulfur transfer agent in fluid catalytic cracking (FCC) units. The acidity and basicity of these samples can be tuned by varying the pH value of the synthesis system. From the characterization and catalytic cracking tests the introduction of zeolitic building units into the spinels contributed to the increased microporosity, acidity, and hydrothermal stability. The catalytic results indicate that the activities and the product selectivities of the modified spinels for vacuum gas oil (V ) cracking improved remarkably compared to the parent spinel. These samples exhibited even better performance than Kaolin clay for V cracking while retaining a part of the basic sites for oxidative SO₂ uptake. Moreover, the FCC catalyst prepared using the modified spinel as a partial matrix, after equilibration, also gave superior catalytic behavior compared to a reference FCC catalyst with Kaolin clay as the main matrix.
- Magnesium-aluminate spinel,
- Zeolite Y nanocluster,
- Sulfur transfer,
- Catalytic cracking,
- Hydrothermal stability
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