Preparation and effect of Pt/CeZrO2 diesel oxidation catalysts support

doi:10.11949/j.issn.0438-1157.20161535

Abstract

Abstract:

CeZrO₂ solid solutions were prepared by co-precipitation method through adopting different precipitators (NaOH, H₂C₂O₄, Na₂CO₃), and as the support, a series of Pt/CeZrO₂ diesel oxidation catalysts was prepared. The physical and chemical properties were studied using the means of XRD, BET, H₂-TPR and catalytic oxidation reaction. The results showed that the CeZrO₂ solid solutions using NaOH as precipitant had the largest surface area(68.8 m²·g^-1), the most active oxygen[the H₂ consumption of the surface oxygen is 1143 μmol·(g cat)^-1] and the highest Pt dispersion on the surface, so the Pt/CeZrO₂-NaOH exhibited excellent catalytic activity. In particular, catalytic oxidation hydrocarbons (C₃H₆), the T₉₀ decreased about 40℃ than the Pt/CeZrO₂ catalyst prepared with H₂C₂O₄ or Na₂CO₃. Besides, the preparation methods also influenced tolerance to sulfur of the catalysts. So selecting a suitable carrier precipitant could make the DOC catalyst has good activity and sulfur-resistance.

Key words: precipitant, catalyst support, CeZrO₂ solid solutions, catalyst, Pt/CeZrO₂, reactivity

摘要：

分别用氢氧化钠（NaOH）、草酸（H₂C₂O₄）和碳酸钠（Na₂CO₃）为沉淀剂制备CeZrO₂固溶体，并以此为载体制备了Pt/CeZrO₂柴油车DOC催化剂，通过XRD、BET、H₂-TPR和催化氧化反应等手段对催化剂物理化学特性进行研究。结果发现，以NaOH作为沉淀剂制备的CeZrO₂固溶体比表面积大（68.8 m²·g^-1）、氧活动性强[表面氧耗氢量达1143 μmol·（g cat（^-1]，同时贵金属Pt在其表面高度分散，因此制得的Pt/CeZrO₂柴油车DOC催化剂催化效果好，特别是催化氧化碳氢化合物（C₃H₆），T₉₀比H₂C₂O₄和Na₂CO₃为沉淀剂制备的Pt/CeZrO₂催化剂降低了将近40℃。另外载体制备方式对催化剂抗硫性影响也十分显著。故选择一种合适的载体沉淀剂可使制得的DOC催化剂具备良好的活性及抗硫性。

关键词: 沉淀剂, 催化剂载体, CeZrO₂固溶体, 催化剂, Pt/CeZrO₂, 活性

CLC Number:

O643.3
X511

HUANG Haifeng, CHEN Xiao, GU Lei, XU Qinqi, ZHAN Linjun, LU Hanfeng. Preparation and effect of Pt/CeZrO₂ diesel oxidation catalysts support[J]. CIESC Journal, 2017, 68(4): 1390-1397.

黄海凤, 陈晓, 顾蕾, 徐琴琪, 占林军, 卢晗锋. 柴油车DOC催化剂Pt/CeZrO₂载体的制备及影响[J]. 化工学报, 2017, 68(4): 1390-1397.

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Preparation and effect of Pt/CeZrO₂ diesel oxidation catalysts support

柴油车DOC催化剂Pt/CeZrO₂载体的制备及影响

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