The chain mechanism in catalytic cracking. The chain mechanism in catalytic cracking

Journal Article · Mon Mar 01 04:00:00 EST 1993 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1993.1081· OSTI ID:6347658

Zhao, Yingxian; Bamwenda, G R; Groten, W A; Wojciechowski, B W ^[1]

---

1. Queen's Univ., Kingston, Ontario (Canada)

The cracking of 2-methylpentane on USHY at 300, 400, 450, and 500[degrees]C is interpreted in detail in terms of a chain mechanism. The kinetic equation developed from this mechanism fits the experimental data very well. The contribution of chain processes to the overall rate of conversion depends on the kinetic chain length, which in turn depends on the surface coverage by carbenium ions and their reactivities. Kinetic parameters were obtained at all four temperatures. A detailed examination of the kinetics shows that chain processes are more important at low reaction temperatures, whereas protolytic cracking dominates at higher temperatures. The parameters also show that both competitive inhibition by products and the rate of catalyst decay increase with increasing reaction temperature. Furthermore, they show that carbenium ions formed on Broensted sites are more stable than carbonium ions. 39 refs., 12 figs., 5 tabs.

• OSTI ID: 6347658
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 140:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKANES
BROENSTED ACIDS
BY-PRODUCTS
CATALYSTS
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHARGED PARTICLES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRACKING
DECOMPOSITION
HYDROCARBONS
HYDROGEN COMPOUNDS
INHIBITION
INORGANIC ACIDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IONS
KINETICS
MATERIALS
MINERALS
ORGANIC COMPOUNDS
PYROLYSIS
REACTION KINETICS
SILICATE MINERALS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
THERMOCHEMICAL PROCESSES
ZEOLITES