The kinetics of the catalytic reforming reaction of methane with carbondioxide to produce synthesis gas on a Ni/α-Al_2O_3 and a HSD-2 type commercial catalyst has beenstudied. The results indicate that the reaction o...The kinetics of the catalytic reforming reaction of methane with carbondioxide to produce synthesis gas on a Ni/α-Al_2O_3 and a HSD-2 type commercial catalyst has beenstudied. The results indicate that the reaction orders are one and zero for methane and carbondioxide, respectively, when the carbon dioxide partial pressure was about 12.5-30.0 kPa and thetemperature was at 1123-1173 K. However, when the carbon dioxide partial pressure was changed to30.0-45.0 kPa under the same temperature range of 1123-1173 K, the reaction orders of methane andcarbon dioxide are one. Furthermore, average rate constants at different temperatures weredetermined.展开更多
A kinetic study of biogas production from Urban Solid Waste (USW) generated in Dar es Salaam city (Tanzania) is presented. An experimental bioreactor simulating mesophilic conditions of most USW landfills was develope...A kinetic study of biogas production from Urban Solid Waste (USW) generated in Dar es Salaam city (Tanzania) is presented. An experimental bioreactor simulating mesophilic conditions of most USW landfills was developed. The goal of the study was to generate the kinetic order of reaction with respect to biodegradable organic waste and use it to model biogas production from food residues mixed with fruit waste. Anaerobic biodegradation was employed under temperature range of 28℃ - 38℃. The main controls were leachate recirculation and pH adjustments to minimize acid inhibitory effects and accelerate waste biodegradation. The experimental setup comprised of three sets of bioreactors. A biodegradation rate law in differential form was proposed and the numerical values of kinetic order and rate constant were determined using initial rate method as 0.994 and 0.3093 mol0.006·day-1, respectively. Results obtained were consistent with that found in literature and model predictions were in reasonable agreement with experimental data.展开更多
The adsorption characteristics of （+）-Catechin on self-prepared polypropylene-based anion （exchange） fiber under static conditions were studied and the adsorption isotherms at different temperatures were also dete...The adsorption characteristics of （+）-Catechin on self-prepared polypropylene-based anion （exchange） fiber under static conditions were studied and the adsorption isotherms at different temperatures were also determined. The results show that the adsorption behavior of （+）-Catechin in dilute solution on the anion exchange fiber basically obeys in the Freundlich equation. Based on infinitesimal calculation the reaction order is 1. When the initial concentration is 44.60 mg/L, the values of the apparent rate constants at 286 K, （303 K）, 323 K and 338 K are 0.016 7, 0.039 4, 0.054 5 and 0.094 4 min-1 respectively, and the rate （constant） values increase with the rise of temperature.展开更多
文摘The kinetics of the catalytic reforming reaction of methane with carbondioxide to produce synthesis gas on a Ni/α-Al_2O_3 and a HSD-2 type commercial catalyst has beenstudied. The results indicate that the reaction orders are one and zero for methane and carbondioxide, respectively, when the carbon dioxide partial pressure was about 12.5-30.0 kPa and thetemperature was at 1123-1173 K. However, when the carbon dioxide partial pressure was changed to30.0-45.0 kPa under the same temperature range of 1123-1173 K, the reaction orders of methane andcarbon dioxide are one. Furthermore, average rate constants at different temperatures weredetermined.
文摘A kinetic study of biogas production from Urban Solid Waste (USW) generated in Dar es Salaam city (Tanzania) is presented. An experimental bioreactor simulating mesophilic conditions of most USW landfills was developed. The goal of the study was to generate the kinetic order of reaction with respect to biodegradable organic waste and use it to model biogas production from food residues mixed with fruit waste. Anaerobic biodegradation was employed under temperature range of 28℃ - 38℃. The main controls were leachate recirculation and pH adjustments to minimize acid inhibitory effects and accelerate waste biodegradation. The experimental setup comprised of three sets of bioreactors. A biodegradation rate law in differential form was proposed and the numerical values of kinetic order and rate constant were determined using initial rate method as 0.994 and 0.3093 mol0.006·day-1, respectively. Results obtained were consistent with that found in literature and model predictions were in reasonable agreement with experimental data.
文摘The adsorption characteristics of （+）-Catechin on self-prepared polypropylene-based anion （exchange） fiber under static conditions were studied and the adsorption isotherms at different temperatures were also determined. The results show that the adsorption behavior of （+）-Catechin in dilute solution on the anion exchange fiber basically obeys in the Freundlich equation. Based on infinitesimal calculation the reaction order is 1. When the initial concentration is 44.60 mg/L, the values of the apparent rate constants at 286 K, （303 K）, 323 K and 338 K are 0.016 7, 0.039 4, 0.054 5 and 0.094 4 min-1 respectively, and the rate （constant） values increase with the rise of temperature.
