金属改性Ti-HMS的制备表征及催化氧化脱硫性能

发布时间：2018-02-01 17:58

  本文关键词： Ti-HMS 合成 金属改性 表征 氧化脱硫　出处：《高校化学工程学报》2017年01期 　论文类型：期刊论文

【摘要】：通过超声浸渍的方式对原位合成的Ti-HMS分子筛进行负载金属改性,制备Fe/Ti-HMS、Cu/Ti-HMS和Zn/Ti-HMS催化剂,并采用XRD、SEM、TEM、FTIR、BET等手段对催化剂的结构和形貌进行表征,以模型油中噻吩的氧化脱除为探针反应对各催化剂的催化氧化脱硫性能进行研究,并考察了反应时间、n(H_2O_2)/n(S)、Zn/Ti-HMS催化剂用量和反应温度对脱硫率的影响。实验结果表明,原位合成的Ti-HMS分子筛具有典型的介孔孔道结构,金属组分以氧化物的形式分散在分子筛的表面,金属组分的存在可以有效地提高催化剂的催化活性,负载金属组分的催化剂催化活性由大到小依次为Zn/Ti-HMSCu/Ti-HMSFe/Ti-HMS。在反应温度为70℃、n(H_2O_2)/n(S)=6、Zn/Ti-HMS催化剂用量0.2 g×(10 m L)~(-1)、反应时间60 min时,噻吩的脱除率达到94.03%。催化剂再生后催化氧化脱硫性能有所下降,表面金属活性组分的消耗和分子筛部分孔道被堵塞是导致催化剂催化活性下降的原因。
[Abstract]:Fe / Ti-HMS-Cup-Ti-HMS and Zn/Ti-HMS catalysts were prepared by metal modification of in-situ synthesized Ti-HMS molecular sieve by ultrasonic impregnation. The structure and morphology of the catalyst were characterized by means of XRDX SEM Tem Tem FTIR BET and so on. The catalytic oxidation desulfurization performance of each catalyst was studied with the oxidation removal of thiophene from the model oil as a probe reaction. The reaction time was investigated. The effect of the amount of Zn/Ti-HMS catalyst and reaction temperature on the desulphurization rate. The experimental results show that the in-situ synthesis of Ti-HMS molecular sieve has a typical mesoporous structure. The metal component is dispersed on the surface of molecular sieve in the form of oxide. The presence of metal component can effectively improve the catalytic activity of the catalyst. The catalytic activity of the supported metal component is Zn / Ti-HMSCU / Ti-HMSFe / Ti-HMSs from large to small, and the reaction temperature is 70 鈩，

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