溶胶凝胶法由细菌纤维素制备CuCe_(0.75)Zr_(0.25)O_x复合氧化物及其低温催化降解甲苯性能
Preparation of CuCe_(0.75)Zr_(0.25)O_x composite by bacterial cellulose promoted sol-gel method and its catalytic performance in the toluene degradation at low temperature
查看参考文献29篇
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文摘
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以绿色廉价的天然椰果细菌纤维素(BC)为造孔剂,采用溶胶凝胶法制备了CuCe_(0.75)Zr_(0.25)O_x复合氧化物催化剂,通过TG/DTG、N2低温物理吸脱附、XRD、H_2-TPR、O_2-TPD和Raman等手段对催化剂进行了表征,并对其在固定床上挥发性有机物(VOCs)降解的催化性能进行了研究。结果表明,利用BC精细的纤维网状结构和亲水性能与活性金属盐溶液形成凝胶,可有效制备介孔结构的复合氧化物催化剂。制备过程中,凝胶形式和成胶温度对催化剂降解甲苯的活性有较大影响;采用醇凝胶形式在70℃时制备的ACCZ-70催化剂完全降解甲苯的温度为205 ℃,明显低于已有文献报道的催化剂,这主要归因于该催化剂具有良好的低温还原性和高达0.81的氧空穴浓度。而采用水凝胶制备的催化剂降解甲苯时,在120-140 ℃存在吸附现象。 |
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其他语种文摘
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Mesoporous CuCe_(0.75) Zr_(0.25) O_x composite was prepared by a simple sol-gel method with environmentally benign bacterial cellulose (BC) as a pore former and characterized by TG/DTG,N_2 adsorption-desorption,XRD, H_2-TPR,02-TPD and Raman; its catalytic activity in the degradation of toluene at low temperature was investigated in a fixed-reactor. The results indicated that BC with ultra fine three-dimensional networks and excellent compatibility is beneficial to the formation of gel with nitrate solution,to prepare the mesoporous catalyst. The catalyst performance of CuCe_(0.75)Zr_(0.25) O_x composite is significantly affected by the gel- form and gelling temperature during the preparation process. Over the ACCZ-70 catalyst prepared by alcohol gelling at 70 ℃,the temperature for a complete degradation of toluene (T_(100)) reaches 205 ℃,much lower than those reported in open literature; the excellent activity of ACCZ-70 is ascribed to its high reducibility at low temperature and high concentration of oxygen vacancies (0.81). In addition,adsorption phenomenon was observed in the range of 120-140 ℃ during the toluene degradation over WCCZ catalysts prepared by water gelling. |
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来源
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燃料化学学报
,2017,45(11):1401-1408 【核心库】
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关键词
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细菌纤维素
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溶胶凝胶
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复合氧化物催化剂
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VOCs
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地址
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1.
天津科技大学化工与材料学院, 天津, 300457
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中国科学院力学研究所, 高温气体动力学国家重点实验室, 北京, 100190
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0253-2409 |
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学科
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化学工业 |
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基金
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国家自然科学基金青年科学基金
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文献收藏号
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CSCD:6114922
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