During the third quarter work continued on characterization and pyrolysis of the Argonne coal samples. Additional work was done on mass transfer effects. To model pyrolysis data for low heating rate experiments, the internal mass transfer resistance to tar escape must be included. Preliminary design of the high-pressure reactor was completed. Studies of ignition were continued in the transparent wall reactor (TWR). The literature search was continued to identify the important effects of coal minerals in determining coal behavior. Experiments have also begun on the examination of the mineral composition and transformation of eight Argonne premium heat and mass transport effects in coal pyrolysis continued. In addition, calculations were done to define regimes of internal and external heat and mass transport control for conditions of interest. The mechanisms and rates of thermal NO formation in fuel-lean and fuel-rich conditions were determined from the literature. Two flow reactor configurations were designed and fabrication initiated for the NO/sub x/SO/sub x/ studies. The effect of neglecting turbulent fluctuation in gasification, was investigated. Code sensitivity to several thermal parameters affecting devolatilization was also investigated. A literature review was conducted of existing fixed-bed models for coal gasification. Available codes were identified for installation at BYU, and steps were taken to obtain those codes. A general outline of desired features to be included in the advanced model was developed. 60 refs.