【摘要】 以三乙胺和四乙基氢氧化铵为复合模板剂,采用水热法合成出SAPO-34分子筛,并以其为载体,通过旋蒸浸渍法制备出CoCr_x/SAPO-34系列催化剂（x=0.05～0.25）.考察了该类催化剂的结构及表面酸性,并以1,2-二氯乙烷（1,2-DCE）为目标污染物,评价了其催化燃烧性能.结果表明, Co₃O₄负载量为20%（质量分数）、Cr掺杂量为0.06的CoCr_0.06/SAPO-34对1,2-DCE表现出优良的催化活性(T₉₀=290℃).在290℃下, CoCr_0.06/SAPO-34对1,2-DCE的催化转化率能45 h保持80%以上,表现出优良的稳定性以及耐氯中毒特性.更多还原

【Abstract】 Catalytic combustion is one of the most efficient and economical methods for the treatment of chlorinated volatile organic compounds（CVOCs）. For the exploration of high-efficient catalyst,SAPO-34 type molecular sieve was synthesized by hydrothermal method using triethylamine and tetraethylammonium hydroxide as composite templates,and subsequently used as support to prepare a series of CoCr_x/SAPO-34 catalysts（x=0.05—0.25）by rotary steam impregnation method. Structure and surface acidity of these catalysts were investigated,and their catalytic combustion performance was evaluated with 1,2-dichloroethane（1,2-DCE）as the target pollutant. The results showed that the CoCr_0.06/SAPO-34 catalyst with the loading of 20%（mass fraction）Co₃O₄ and the Cr doping ratio of 0.06 exhibited excellent catalytic activity for 1,2-DCE(T₉₀=290 ℃).At 290 ℃,the catalytic conversion of 1,2-DCE over CoCr_0.06/SAPO-34 can be maintained beyond 80% for 45 h,showing excellent stability and resistance to chlorine poisoning.更多还原