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采用浸渍法将钨负载在丙烯酸系弱酸性阳离子交换树脂D152上,制成了催化剂W/D152.实验研究了浸渍钨溶液p H值、温度、浓度等制备条件对催化氧化去除二苯并噻吩(DBT)活性的影响,并确定了催化剂的最佳制备条件.同时,运用红外光谱(FTIR)和环境电镜扫描(SEM)对W/D152的微观面貌进行了观察和分析.结果表明,在p H值为2.5,温度为30℃,2.5%(质量分数)的含钨溶液条件下制备的催化剂脱硫效果最佳;初始溶液含硫量为400 mg·kg-1,最高去除率达到99.1%,处理后样品的含硫量约为3.52 mg·kg-1,达到了总含硫量要求小于10mg·kg-1的欧五标准.催化剂表征结果表明,钨成功负载在树脂上,并形成一层薄层.W/D152催化剂循环使用7次后,处理后样品的含硫量仍可达到欧五标准.该催化剂催化氧化二苯并噻吩的反应符合一级动力学模型,速率常数为0.1091 min-1.
The impregnation method was used to load tungsten onto the weakly acidic acrylic acid cation exchange resin D152 to prepare the catalyst W / D152.The effects of preparation conditions such as p H value, temperature and concentration of impregnation tungsten solution on the catalytic oxidation of dibenzothiophene DBT) activity and the optimum preparation conditions of the catalyst were determined.The microscopic appearance of W / D152 was observed and analyzed by infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) .The results showed that at p H The value of 2.5, the temperature of 30 ℃, 2.5% (mass fraction) tungsten catalyst prepared under the best desulfurization conditions; initial solution sulfur content of 400 mg · kg-1, the maximum removal rate of 99.1%, the treatment After the sample had a sulfur content of about 3.52 mg · kg-1, it reached the EU-5 standard with a total sulfur requirement of less than 10 mg · kg-1. The catalyst characterization showed that the tungsten was successfully supported on the resin and formed a thin Layer.While the W / D152 catalyst was recycled for 7 times, the sulfur content of the treated sample could reach the Euro 5. The catalytic oxidation of dibenzothiophene catalyzed by the first-order kinetic model with a rate constant of 0.1091 min-1 .