最新色国产精品精品视频,中文字幕日韩一区二区不卡,亚洲有码转帖,夜夜躁日日躁狠狠久久av,中国凸偷窥xxxx自由视频

+高級(jí)檢索
BaO對(duì)單Pd催化劑凈化甲醇燃料車尾氣性能的影響
DOI:
作者:
作者單位:

作者簡(jiǎn)介:

通訊作者:

中圖分類號(hào):

基金項(xiàng)目:

國(guó)家自然科學(xué)基金 (21173153)；成都信息工程學(xué)院科研基金 (KYTZ201219)；四川省高校大氣環(huán)境模擬與污染控制重點(diǎn)實(shí)驗(yàn)室基金（ZZKT2012006）


Effects of BaO on the Performance of Catalytic Purification Exhausts from the Gasoline-Methanol Fuel Over Only-Palladium
Author:
Affiliation:

Fund Project:

  • 摘要
    • |
  • 圖/表
    • |
  • 訪問(wèn)統(tǒng)計(jì)
    • |
  • 參考文獻(xiàn)
    • |
  • 相似文獻(xiàn)
    • |
  • 引證文獻(xiàn)
    • |
  • 資源附件
    • |
  • 文章評(píng)論
    摘要:

    采用等體積浸漬法制備了BaO改性的單Pd催化劑，并用BET，CO化學(xué)吸附，XRD， H2-TPR， NH3-TPD，XPS對(duì)催化劑進(jìn)行了表征，考察了其對(duì)甲醇、CO、C3H8的催化氧化性能。結(jié)果表明，BaO的添加可使Pd粒子高度分散，催化劑表面易還原氧物種量增多，還原速率加快，還原性能得以改善；同時(shí)還可增強(qiáng)金屬與載體間的電子效應(yīng)，使Pd向氧化態(tài)過(guò)渡，Ce4+向還原態(tài)Ce3+過(guò)渡，并在金屬與載體界面間產(chǎn)生大量具有活性的氧物種，進(jìn)而提高了催化劑對(duì)甲醇和CO的低溫活性，T50可分別降低26，21℃。催化劑表面酸性降低以及較高氧化態(tài)Pd物種形成可能是導(dǎo)致C3H8轉(zhuǎn)化率下降的主要原因

    Abstract:

    Only-Palladium catalysts modified with BaO as a promoter was prepared by an impregnation method. Specific surface area measurements (BET), X-ray diffraction (XRD), CO-chemisorption, H2-temperature-programmed reduction (H2-TPR), NH3-temperature programmed desorption (NH3-TPD), and X-ray photoelectron spectroscopy (XPS) were used to characterize the effect of BaO on the physicochemical properties of the catalysts. Their catalytic activities towards methanol, CO and C3H8 conversions were evaluated. The results show that the addition of BaO makes palladium highly dispersed, enhances the amount of active oxygen and promotes the reductive ability. The electron effects between Pd and support is improved. It is favorable for maintaining Pd in a higher oxidized state and transiting Ce4+ to Ce3+, thus accelerating the activated oxygen migration between Pd and the support and consequently increasing the catalytic activities for methanol and CO oxidation at low temperature. The light-off temperature of T50 is lowered by 26 and 21 oC to methanol and CO, respectively compared with unmodified only-Palladium catalysts. Whereas the conversion of C3H8 falls directly because of the higher oxidized Pd2+ and the amount and intensity of the acid sites decreasing obviously

    參考文獻(xiàn)
    相似文獻(xiàn)
    引證文獻(xiàn)
引用本文

張雪喬,葉芝祥,余 靜,陳耀強(qiáng),趙 明. BaO對(duì)單Pd催化劑凈化甲醇燃料車尾氣性能的影響[J].稀有金屬材料與工程,2013,42(10):2101~2106.[Zhang Xueqiao, Ye Zhixiang, Yu Jing, Chen Yaoqiang, Zhao Ming. Effects of BaO on the Performance of Catalytic Purification Exhausts from the Gasoline-Methanol Fuel Over Only-Palladium[J]. Rare Metal Materials and Engineering,2013,42(10):2101~2106.]
DOI：[doi]

復(fù)制
文章指標(biāo)
  • 點(diǎn)擊次數(shù):
  • 下載次數(shù):
  • HTML閱讀次數(shù):
  • 引用次數(shù):
歷史
  • 收稿日期:2012-12-19
  • 最后修改日期:
  • 錄用日期:
  • 在線發(fā)布日期:
  • 出版日期: