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用于低温分解二恶英的高效负载型V_xO_y/Ce/TiO_2催化剂的制备与性能 被引量:2
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作者 邵丹 刘奎仁 李松 《材料与冶金学报》 CAS 北大核心 2015年第3期187-192,共6页
以堇青石为载体,采用溶胶-凝胶法并结合浸渍法制备负载型催化剂VxOy/Ce/Ti O2,以邻二氯苯替代二恶英进行实验室模拟实验,考察Ce添加量、溶胶-凝胶浸渍时间、偏钒酸铵溶液浓度、偏钒酸铵溶液浸渍时间和煅烧温度对催化剂性能的影响,用气... 以堇青石为载体,采用溶胶-凝胶法并结合浸渍法制备负载型催化剂VxOy/Ce/Ti O2,以邻二氯苯替代二恶英进行实验室模拟实验,考察Ce添加量、溶胶-凝胶浸渍时间、偏钒酸铵溶液浓度、偏钒酸铵溶液浸渍时间和煅烧温度对催化剂性能的影响,用气相色谱检测分解前后气体,确定了最佳制备工艺条件;考察了低温下催化剂性能及稳定性;用超声波清洗器检测薄膜与载体的结合强度,并用XRD、SEM对材料进行了表征;工业侧流实验表明,该催化剂的催化性能优异,二恶英分解率达90%以上. 展开更多
关键词 堇青石 负载型 邻二氯苯 低温催化分解 二恶英
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Robust microwave catalytic decomposition of H_(2)S into H_(2) and S at low temperature over Mo_(2)C@CeO_(2) catalysts
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作者 SUN Hongyang CHEN Jun +2 位作者 TU Cong ZHOU Jicheng XU Wentao 《燃料化学学报(中英文)》 北大核心 2025年第9期1399-1415,I0027,I0028,共19页
The new technology of direct decomposition of H_(2)S into high value-added H_(2) and S,as an alternative to the Claus process in industry,is an ideal route that can not only deal with toxic and abundant H_(2)S waste g... The new technology of direct decomposition of H_(2)S into high value-added H_(2) and S,as an alternative to the Claus process in industry,is an ideal route that can not only deal with toxic and abundant H_(2)S waste gas but also recover clean energy H_(2),which has significant socio-economic and ecological advantages.However,the highly effective decomposition of H_(2)S at low temperatures is still a great challenge,because of the stringent thermodynamic equilibrium constraints(only 20% even at high temperature of 1010℃).Conventional microwave catalysts exhibit unsatisfactory performance at low temperatures(below 600℃).Herein,Mo_(2)C@CeO_(2) catalysts with a core-shell structure were successfully developed for robust microwave catalytic decomposition of H_(2)S at low temperatures.Two carbon precursors,para-phenylenediamine(Mo_(2)C-p)and meta-phenylenediamine(Mo_(2)C-m),were employed to tailor Mo_(2)C configurations.Remarkably,the H_(2)S conversion of Mo_(2)C-p@CeO_(2) catalyst at a low temperature of 550℃ is as high as 92.1%,which is much higher than the H_(2)S equilibrium conversion under the conventional thermal conditions(2.6% at 550℃).To our knowledge,this represents the most active catalyst for microwave catalytic decomposition of H_(2)S at low temperature of 550℃.Notably,Mo_(2)C-p demonstrated superior intrinsic activity(84%)compared to Mo_(2)C-m(6.4%),with XPS analysis revealing that its enhanced performance stems from a higher concentration of Mo_(2+)active sites.This work presents a substitute approach for the efficient utilization of H_(2)S waste gas and opens up a novel avenue for the rational design of microwave catalysts for microwave catalytic reaction at low-temperature. 展开更多
关键词 direct decomposition of H_(2)S microwave catalysis low temperature microwave selective catalytic effect Mo_(x)C@CeO_(2) H_(2)production
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