【摘要】 采用FeCl₃和2,4,6-三巯基三嗪（TMT）溶液分别清洗再生砷（As）中毒商业V₂O₅-WO₃/TiO₂催化剂,通过BET、 XRD、 XRF、 in situ DRIFTS以及H₂-TPR等表征方法对清洗再生前后催化剂理化性质进行分析.研究发现,清洗后催化剂脱硝活性有极大地恢复, 20 mg·mL^-1 FeCl₃和0.5%TMT溶液再生30 min时最佳As去除率分别为83.67%和94.57%.清洗后,阻塞在催化剂微孔和中孔中的AsO_x被清除,因此再生后催化剂比表面积和孔体积均有所增大而平均孔径略有减小.同时, FeCl₃和2,4,6-TMT溶液清洗再生后催化剂表面Br?nsted和Lewis酸强度均有所增加,这可能是再生催化剂催化性能提高的主要原因.更多还原

【Abstract】 FeCl₃ and 2,4,6-trimercaptotriazine（TMT） solutions were used to clean and regenerate arsenic（As） poisoned commercial V₂O₅-WO₃/TiO₂ catalysts. A comparative study of physico-chemical properties between poisoned and regenerated catalysts was carried out by Brunauer-Emmette-Teller（BET）, X-ray diffraction（XRD）, X-ray fluorescence（XRF）, in situ infrared spectrometry（in situ IR）, and temperature programmed reduction of H₂（H₂-TPR）. It was found that the catalyst’s denitration activity was greatly restored after cleaning. Regeneration by 20 mg·mL^-1 FeCl₃ and 0.5% TMT solution for 30 min exhibited best As removal ratio of 83.67% and 94.57%, respectively. The micropores and mesopores which blocked by As oxides were cleaned, thus the specific surface area, pore volume increased and the average pore diameter decreased. Meanwhile, the Br?nsted and Lewis acid strengths of the catalyst surface increased after FeCl₃ and 2,4,6-TMT solution cleaning and regeneration, which might be the main reason for the improvement of catalytic performance over the regenerated catalysts.更多还原