DEGRADATION OF VOLATILE ORGANIC COMPOUNDS USING MICRO / NANOROD MOLECULAR SIEVE IN A COMBINED REACTOR.

The purpose of this study is to prepare the micro/nanorod materials in low middle temperature to remove the volatile organic compound (taking toluene as target) in the waste air pollution stream using a combined reactor with photo- and thermo-reaction at the same time. The micro/nanorod molecular sieve (Octahedral manganese cryptomelanes, K-OMS-2) are fabricated and coated on support of Al₂O₃, and the catalyst is used in the combined reactor with light and heat sources at feasible temperature to convert the target. The decomposition/removal efficiency of toluene in photo- and thermos-reactor as well as the photoelectric characteristic analyses are evaluated. The operation parameters of temperature of reactor and initial concentrations etc. are carried out, meanwhile, the characteristic analyses (EA, TEM-EDS, XRD, LaB6-TEM, XPS, FTIR etc.) are also examined in order to find the optimum conditions. In the performance of the photodegradation reaction, the optimum n is the catalyst of K-OMS-2/Al₂O₃ calcination temperature of 523 K with UVLED of 633 hr-1 space velocity (SV), and the maximum value is 95.56%. However, the CO₂ conversion is not obvious in the photodegradation reaction due to the not complete degradation. In the photo- and thermosdegradation reactor, the situation can be improved and the maximum n of 95.25% and CO₂a conversion of 95% can reach at 873K with UVLED. The result proves that the combined reactor for photo- and thermos-degradation can work in both industrial or domestic application in air pollution control. [ABSTRACT FROM AUTHOR]