The effect of alumina on FCC catalyst in the presence of nickel and vanadium

被引:31
作者
Pinto, F. V. [1 ]
Escobar, A. S. [1 ]
de Oliveira, B. G. [1 ]
Lam, Y. L. [2 ]
Cerqueira, H. S. [3 ]
Louis, B. [4 ]
Tessonnier, J. P. [5 ]
Su, D. S. [5 ]
Pereira, M. M. [1 ]
机构
[1] Univ Fed Rio de Janeiro, Inst Quim, Dept Quim Inorgan, BR-21949900 Rio De Janeiro, Brazil
[2] Tecnol FCC, PDAB, Ctr Pesquisas & Desenvolvimento Leopoldo A Miguez, PETROBRAS, BR-21949900 Rio De Janeiro, Brazil
[3] GERIS Engn, BR-20040002 Rio De Janeiro, Brazil
[4] Univ Strasbourg, CNRS, UMR 7515, LMSPC, F-67087 Strasbourg 2, France
[5] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany
关键词
Nickel; Vanadium; Alumina; Metal trap; FCC; Elemental mapping; FLUIDIZED CRACKING CATALYSTS; USY COKE FORMATION; DEACTIVATION; METAL; ZEOLITE; DEHYDROGENATION; CONTAMINATION; MODEL; IRON; NI;
D O I
10.1016/j.apcata.2010.07.055
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Although several works studied the effect of metals on Y zeolites in the FCC process, only a few focused on the role of other FCC catalyst components such as silica (binder) and alumina (matrix). Aiming to understand the matrix effect on metal distributions on the catalyst components - which can impact its deleterious properties - two FCC model catalysts were modified with nickel and/or vanadium. One consisted of USY zeolite, silica and kaolin, the other contained the same components plus alumina. The catalysts were characterized by three model reactions: ethane hydrogenolysis, cyclohexane transformation and n-hexane cracking. Also, textural properties, temperature-programmed reduction (TPR) and elemental mapping analyses were performed to characterize both nickel and vanadium distributions (throughout) the alumina ingredient. In the absence of metals, both catalysts showed similar catalytic activity and selectivity in n-hexane cracking reaction, indicating that the zeolite sites are responsible for the activity. The n-hexane activity largely decreased in the presence of nickel regardless of the presence of alumina. On the other hand, the presence of alumina allows the catalyst to retain more n-hexane activity and microporosity after vanadium introduction. Vanadium was homogeneously distributed in the catalyst without alumina, while in the presence of alumina the mapping results indicate some areas of higher vanadium concentration. After oxidation thermal treatment for V-alumina catalyst, all catalysts showed loss in the n-hexane activity. However, the relative rates between the catalyst with and without vanadium were retained suggesting that the distribution of V did not change. Cyclohexane and ethane hydrogenolysis model reaction data implied that the coke formation on nickel particles was limited due to metal-alumina interaction. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:15 / 21
页数:7
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