Pt/MoO3/ZrO2催化剂的制备及三效催化性能的研

doi:10.3724/SP.J.1077.2008.01267

无机材料学报

Pt/MoO₃/ZrO₂催化剂的制备及三效催化性能的研

温怡芸, 刘志敏, 蔡黎, 郭家秀, 龚茂初, 陈耀强

四川大学化学学院, 绿色化学与技术教育部重点实验室, 成都 610064

收稿日期:2008-02-01 修回日期:2008-03-26 出版日期:2008-11-20 网络出版日期:2008-11-20

Preparation of Pt/MoO₃/ZrO₂ Catalyst and its Property of Three-Way Catalysts

WEN Yi-Yun, LIU Zhi-Ming, CAI Li, GUO Jia-Xiu, GONG Mao-Chu, CHEN Yao-Qiang

College of Chemistry, Key Laboratory of Green Chemistry & Technology, Sichuan University, Chengdu 610064, China

Received:2008-02-01 Revised:2008-03-26 Published:2008-11-20 Online:2008-11-20

摘要/Abstract

摘要： 采用浸渍法制备了MoO₃/ZrO₂, 用低温氮吸附-脱附法和NH3-程序升温脱附法(TPD)分别对其比表面积和酸碱性进行了表征. 结果表明, MoO₃/ZrO₂具有106.8m²/g的比表面积和超强酸的性能. 用等体积浸渍法制备了Pt/MoO₃/ZrO₂催化剂, 在汽车尾气模拟气中考察了其对C₃H₈、CO和NO的催化活性.与传统三效催化剂Pt/La₂O₃/Al₂O₃相比较, Pt/MoO₃/ZrO₂具有更好的低温起燃性能和更宽的空燃比窗口, 并显著地改善了C₃H₈在富氧状态下的转化效率. 通过XRD、H₂-TPR对催化剂进行了表征, 结果表明, Pt在催化剂载体上具有高度的分散性和优异的氧化还原性能.

关键词: MoO₃/ZrO₂, Pt/MoO₃/ZrO₂催化剂, 空燃比特性

Abstract: MoO₃/ZrO₂ was prepared by impregnation method. Its specific surface area, pore size, pore volume and surface acidity were investigated by means of low temperature nitrogen adsorption-desorption and NH₃-temperature programmed desorption. By using MoO₃/ZrO₂ and La₂O₃/Al₂O₃ as catalyst support, Pt/MoO₃/ZrO₂ and Pt/La₂O₃/Al₂O₃ catalysts were prepared by wet impregnation method and the activity test of C₃H₈, CO, NO were also investigated in the simulated automotive gas. The results show that MoO₃/ZrO₂ has good texture(S_BET=106.8m²/g) and surface super-acidity. And the catalysts were also characterized by X-ray diffraction and H₂-temperature programmed reduction. Compared with traditional three-way catalyst Pt/La₂O₃/Al₂O₃, Pt/MoO₃/ZrO₂ exhibits lower light-off temperature of hydrocarbon (230℃), carbon monoxide (200℃), and nitrogen oxides
(210℃) and wider operational air-to-fuel ratio window, which especially improves C₃H₈ conversion under higher oxidative conditions. The results also show that Pt on the catalyst support has high dispersion and excellent redox properties.

Key words: MoO₃/ZrO₂, Pt/MoO₃/ZrO₂ catalyst, air-to-fuels ratio

中图分类号:

O643
TQ426

温怡芸,刘志敏,蔡黎,郭家秀,龚茂初,陈耀强. Pt/MoO₃/ZrO₂催化剂的制备及三效催化性能的研[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2008.01267.

WEN Yi-Yun,LIU Zhi-Ming,CAI Li,GUO Jia-Xiu,GONG Mao-Chu,CHEN Yao-Qiang. Preparation of Pt/MoO₃/ZrO₂ Catalyst and its Property of Three-Way Catalysts[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.01267.

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Pt/MoO₃/ZrO₂催化剂的制备及三效催化性能的研

Preparation of Pt/MoO₃/ZrO₂ Catalyst and its Property of Three-Way Catalysts

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