| Ni对单Pd型挥发性有机废气净化催化剂的助催化作用 | |
| Promotion of Ni on Performance of Pd-only Catalyst for Destractive Removal of Volatile Organic Wastes | |
| 摘要: 本文以蜂窝状堇青石陶瓷为催化剂载体，用分步浸渍法制备了挥发性有机废气(VOCs)净化用Pd-Ni/La-Ce-Zr-Al2O3 /堇青石催化剂，考察了Ni助催化剂对单钯型VOCs净化催化剂性能的影响，并用H2-TPR、比表面、XRD、SEM等手段对催化剂进行了表征。研究表明，Ni的加入明显提高了催化剂的低温活性和热稳定性，经过800 ℃焙烧的Pd-Ni/La-Ce-Zr-Al2O3 /堇青石(mPd∶mNi=3∶20)催化剂的催化性能明显优于Pd/La-Ce-Zr-Al2O3 /堇青石催化剂，甲苯起燃温度下降约25 ℃，经1 000 ℃高温处理后，仍能保持优良的催化性能。Ni的加入使Pd催化剂性能提高的原因应归结于活性组分分散度的提高和钯、镍与载体之间存在的强相互作用。 | |
| 关键词: 钯-镍催化剂 废气净化 甲苯氧化 高温稳定性 | |
| 基金项目: | |
| Abstract: Pd-Ni / La-Ce-Zr-Al2O3 cordierite monolith catalyst for destractive removal of volatile organic gases was prepared by the step-impregnation method and characterized by H2-TPR, automatic N2 adsorption and desorption, XRD and SEM technologies, and the promotion of Ni on the performance of Pd-only combustion catalyst was investigated. The results show that the presence of Ni improves obviously the catalytic activity and thermal stability of the Pd-only combustion catalyst. The Pd-Ni/La-Ce-Zr-Al2O3 / cordierite monolith catalyst (mPd∶mNi=3∶20) calcined at 800 ℃ performed much better than Pd/La-Ce-Zr-Al2O3 / cordierite monolith catalyst for the deep oxidation of toluene, for example, the light-off temperature of toluene over Pd-Ni catalyst is lower ～25 ℃ than that over Pd-only catalyst, and it has high thermal stability even after pre-treated at 1 000 ℃. Addition of Ni promotes the catalytic activity and thermal stability of the supported Pd-only catalyst by active components highly dispersed on the surface of catalyst and strong metal-support interactions between palladium, nickel and the support. | |
| Keywords: palladium-nickel catalyst waste gas cleaning oxidation of toluene thermal stability at high temperature | |
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| 江浩,郭杨龙,张志刚,郭耘,袁芳,卢冠忠.Ni对单Pd型挥发性有机废气净化催化剂的助催化作用[J].无机化学学报,2006,22(7):1210-1214. | |
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