Novel approaches concerning catalyst deactivation. Final report, May 1, 1981-April 31, 1982

Technical Report · Fri Jan 01 04:00:00 EST 1982

OSTI ID:6231932

Tsotsis, T T

Catalyst deactivation is a problem of particular severity for the processes of catalytic coal liquefaction and hydrotreatment of coal-derived liquids. The cost of catalyst replacement, resulting from catalyst deactivation, could conservatively be placed in the range of $2 to $3 per bbl of oil recovered and this is not necessarily the real problem, since the availability of catalytically active metals such as Co, Mo and Ni is a more severe problem than their cost. The experimental findings in this area have been summarized in a series of recent publications and reports. In our recent publication an effort was made to explain the existence of an optimum catalyst size by use of simplified shell-type deactivation models. In this paper we study in detail a mathematical model which has been used with considerable success in modelling the experimental behavior of catalytic coal hydroliquefaction and coal liquid hydrotreatment processes. The purpose of this study is to investigate theoretically the existence and develop, when possible, simple algebraic expressions which predict a catalyst size, average pore size and pore size distribution which yield the best overall catalyst performance and activity. The motivation for this work was our desire to understand, at least qualitatively, the intricate experimental behavior of the catalytic coal hydroliquefaction reaction system. However, the results could conceivably apply to other industrial processes described by lumped kinetic models for which deactivation occurs by smiultaneous site coverage and pore blockage.

• Research Organization: University of Southern California, Los Angeles (USA). Dept. of Chemical Engineering
• DOE Contract Number: FG22-81PC41263
• OSTI ID: 6231932
• Report Number(s): DOE/PC/41263-T1; ON: DE83010890
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
CARBONACEOUS MATERIALS
CATALYSTS
CHEMICAL REACTIONS
COAL LIQUEFACTION
COAL LIQUIDS
CRYSTAL STRUCTURE
DEACTIVATION
DEPOSITION
FLUIDS
HYDROGENATION
LIQUEFACTION
LIQUIDS
MATERIALS
MATHEMATICAL MODELS
MICROSTRUCTURE
POROSITY
THERMOCHEMICAL PROCESSES