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La助劑對Pd-AL2O3催化C3H8氧化性能的研究
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昆明貴金屬研究所

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國家自然科學(xué)基金(21463015); 云南省應(yīng)用基礎(chǔ)研究計劃項目(2014FA045,2016FD123)


Influence of La Promoter in Pd/AL2O3 Catalyst on C3H8 Oxidation
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Kunming institute of precious metals

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    摘要:

    采用不同稀土La前驅(qū)體浸漬摻雜改性Pd/γ-Al2O3催化劑，利用多功能催化性能評價裝置測試不同催化劑的C3H8催化氧化性能，并通過H2-TPR、XRD、XPS等手段對催化材料進(jìn)行結(jié)構(gòu)表征，結(jié)果表明：La能促進(jìn)貴金屬鈀分散，增強(qiáng)鈀與載體相互作用，穩(wěn)定高活性Pd2+物種，從而提高了催化劑的C3H8催化氧化性能。在選用不同La前驅(qū)體改性的Pd/γ-Al2O3催化劑中，硝酸鑭改性效果最佳，能更好地促進(jìn)活性金屬鈀的分散和Pd2+高活性物種的穩(wěn)定。相比Pd/γ-Al2O3，La改性催化劑均降低了C3H8和NO的反應(yīng)轉(zhuǎn)化溫度。選用不同La前驅(qū)體對催化活性影響存在差異的主要原因是La前驅(qū)體添加而引起的金屬-載體相互作用和活性貴金屬鈀的分散狀態(tài)變化。

    Abstract:

    Different rare earth La precursors were used to modify Pd/γ-Al2O3 catalyst via incipient wetness impregnation method. C3H8 oxidation performance was studied using powder sample evaluation device and the structures of catalysts were characterized through H2-TPR, XRD, XPS, etc. The results showed that addition of lanthanum effectively promotes palladium dispersion, strengthens Pd-support interaction and stabilizes highly-active Pd2+ species, improving the catalytic activity for C3H8 oxidation. Addition of lanthanum nitrate showed the best promoted-effect in palladium dispersion and stabilization of highly-active Pd2+ species. Compared with Pd/Al2O3, La-modified catalysts showed lower Ts, T50 and T50 values for C3H8 and NO conversion. Lanthanum addition induced changes in metal-support interaction and disperse state of active species play a significant role in enhanced activity for C3H8 catalytic oxidation.

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陳超,王成雄,姚立鵬,鄭婷婷,趙云昆. La助劑對Pd-AL2O3催化C3H8氧化性能的研究[J].稀有金屬材料與工程,2019,48(6):2027~2032.[chenchao, wangchengxiong, yaolipeng, zhengtingting, zhaoyunkun. Influence of La Promoter in Pd/AL2O3 Catalyst on C3H8 Oxidation[J]. Rare Metal Materials and Engineering,2019,48(6):2027~2032.]
DOI：10.12442/j. issn.1002-185X.20171181

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  • 收稿日期:2017-12-21
  • 最后修改日期:2018-01-08
  • 錄用日期:2018-02-09
  • 在線發(fā)布日期: 2019-07-30
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