刘阳
,
李小松
,
刘景林
,
石川
,
朱爱民
催化学报
doi:10.1016/S1872-2067(14)60070-X
考察了Mn含量和水含量对AgMn/HZSM-5(AgMn/HZ)催化剂上室温O3氧化(OZCO)脱除空气中苯的影响.研究发现, Mn含量为2.4 wt%的AgMn/HZ催化剂(AgMn/HZ(2.4))具有大的比表面积和高的MnOx分散度, OZCO活性和稳定性最高.反应后的程序升温脱附结果表明,2.4 wt%的Mn含量能有效抑制苯和甲酸在催化剂上的残留.当Mn含量≤2.4 wt%时,催化剂分解O3的活性在苯氧化过程中占主导；当Mn含量>2.4 wt%时,苯的活化起主要作用.基于AgMn/HZ(2.4)催化剂优越的反应活性和稳定性,进一步研究了湿气流中该催化剂上苯的氧化.与干气流相比,水汽的加入能显著提高催化剂的反应活性和稳定性,且以0.1-0.2 vol%水含量时最优.
关键词:
催化氧化苯
,
臭氧
,
AgMn/HZSM-5催化剂
,
Mn含量
,
水含量
新型炭材料
以蜜胺泡沫体为模板,采用氟化聚酰业胺制备了微孔泡沫炭.测定了其对环境中水气的吸附/脱附行为,发现:泡沫炭在空气中400℃活化1 h,可以提高其对水气的吸附能力.与活化前相比,对水气的吸附量几乎高达3倍,尽管其微孔容积仅增大了1.5倍.对环境水气中的可逆吸附率与微孔容积成线性关系,微孔容积为0.75mL/g的泡沫炭,其水气吸附率约为质最分数40%.
关键词:
泡沫炭
,
聚酰亚胺
,
模板
,
水蒸气
,
吸/脱附
Chungen ZHOU
,
Jingsheng YU
,
Shengkai GONG
,
Huibin XU
材料科学技术（英文）
The oxidation of specimens with thermal barrier coating (TBC) consisted of nickel-base superalloy, low-pressure plasma sprayed Ni-28Cr-6Al-0.4Y (wt pct) bond coating and electron beam physical vapor deposited 7.5 wt pct yttria stabilized zirconia (YSZ) top coating was studied at 1050℃ respectively in flows of O2, and mixture of O2 and 5%H2O under atmospheric pressure. The thermal barrier coating has relatively low oxidation rate at 1050℃ in pure O2. Oxidation rate of thermal barrier coating in the atmosphere of O2 and 5%H2O is increased The oxidation kinetics obeys almost linear law after long exposure time in the presence of 5% water vapor. Oxide formed along the interface between bond coat and top coat after oxidation at 1050℃ in pure O2 consisted of Al2O3, whereas interfacial scales formed after oxidation at 1050℃ in a mixture of O2 and 5%H2O were mainly composed of Ni(Al,Cr)2O4,NiO and Al2O3. It is suggested that the effect of water vapor on the oxidation of the NiCrAlY coating may be attributed to the increase in Ni and Cr ions transport in the oxides.
关键词:
Oxidation
,
null
,
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