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711.
712.
The effect of pretreatment on Pd/Al2O3 catalysts for the catalytic oxidation of o-xylene at low temperature was studied by changing the pretreatment and testing conditions. The fresh and pretreated Pd/Al2O3 catalysts were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The results showed that the pretreatment dramatically changed the Pd/PdO ratio and then significantly affected the Pd/Al2O3 activity; while the pretreatment had not much influence on Pd particle size. The Pd/Al2O3 pre-reduced at 300℃/400℃, which has fully reduced Pd species, showed the highest activity; while the fresh Pd/Al2O3, which has fully oxidized Pd species, presented the worst performance, indicating the Pd chemical state plays an important role in the catalytic activity for the o-xylene oxidation. It is concluded that metallic Pd is the active species on the Pd/Al2O3 catalyst for the catalytic oxidation of o-xylene at low temperature. 相似文献
713.
Xinyong Liu Zhi Jiang Mingxia Chen Jianwei Shi Wenfeng Shangguan Yasutake Teraoka 《环境科学学报(英文版)》2013,25(5):1023-1033
Pt supported on mesoporous silica SBA-15 was investigated as a catalyst for low temperature selective catalytic reduction(SCR) of NO by C 3 H 6 in the presence of excess oxygen.The prepared catalysts were characterized by means of XRD,BET surface area,TEM,NO-TPD,NO/C 3 H 6-TPO,NH 3-TPD,XPS and 27 Al MAS NMR.The effects of Pt loading amount,O 2 /C 3 H 6 concentration,and incorporation of Al into SBA-15 have been studied.It was found that the removal efficiency increased significantly after Pt loading,but an optimal loading amount was observed.In particular,under an atmosphere of 150 ppm NO,150 ppm C 3 H 6,and 18 vol.% O 2,0.5% Pt/SBA-15 showed remarkably high catalytic performance giving 80.1% NOx reduction and 87.04% C 3 H 6 conversion simultaneously at 140°C.The enhanced SCR activity of Pt/SBA-15 is associated with its outstanding oxidation activities of NO to NO 2 and C 3 H 6 to CO 2 in low temperature range.The research results also suggested that higher concentration of O 2 and higher concentration of C 3 H 6 favored NO removal.The incorporation of Al into SBA-15 improved catalytic performance,which could be ascribed to the enhancement of catalyst surface acidity caused by tetrahedrally coordinated AlO 4.Moreover,the catalysts could be easily reused and possessed good stability. 相似文献
714.
715.
建立了硝酸-氢氟酸-盐酸混酸体系微波消解土壤样品,石墨炉原子吸收分光光谱法测定土壤中痕量钴的方法。通过对标准土样的测定结果表明,该方法容易操作、准确、可靠。 相似文献
716.
Liu Zhengqian Ma Jun Zhao Lei 《Frontiers of Environmental Science & Engineering in China》2007,1(4):482-487
Catalytic ozonation of aqueous solutions of oxalic acid was examined in the presence of graphite-supported platinum catalysts.
The catalytic activity of graphite was significantly enhanced by loading platinum. The removal efficiency of oxalic acid was
3.0%, 47.6% and 99.3% for ozonation alone, graphite catalytic ozonation and Pt/graphite catalytic ozonation in 30 min under
the experimental condition, respectively. The influence of support pretreatment, solvent, impregnation time, platinum loading
amount and reduction temperature on the activity of Pt/graphite catalyst was investigated. The pretreatment of graphite support
had no effect on activity improvement of Pt/graphite catalyst. Solvent and impregnation time also no great effect on the activity.
Platinum loading amount and reduction temperature influenced the catalyst activity significantly. The optimal catalytic performance
of Pt/graphite was obtained when 1.0% platinum loading and 623 K of reduction temperature was adopted. The Pt/graphite catalyst
was used for five times with no significant decrease in its activity and more than 90% oxalic acid removal was obtained.
__________
Translated from Environmental Science, 2007, 28(6): 1258–1263 [译自: 环境科学] 相似文献
717.
718.
719.
Zhou Zexing Yin Ling Xu JingKesearch Center for Eco-Fnvironmental Sciences Chinese Academy of Sciences.Beijing China 《环境科学学报(英文版)》1994,(1)
StudyoncatalystsforcombustionofleanCH_4ZhouZexing,YinLing,XuJingKesearchCenterforEco-FnvironmentalSciences,ChineseAcademyofSc... 相似文献
720.
通过研究不同浓度原油污染对缢蛏(Sinonovacula constricta)鳃和内脏团抗氧化酶活性、脂质过氧化及鳃结构的影响,结合综合生物标志物响应(IBR),探讨潮间带原油污染对生物的毒性效应.结果显示:在剂量-效应方面,2种组织超氧化物歧化酶(SOD)活性和内脏团中谷胱甘肽过氧化物酶(GPx)总体上表现为低浓度诱导、高浓度抑制效应;SOD诱导与过氧化氢酶(CAT)抑制同时出现,规律大致相反.在时间-效应上,SOD活性呈升高-降低-升高的趋势, CAT与GPx呈先降低后升高的趋势;谷胱甘肽硫转移酶(GST)在鳃中呈现先升高后降低的趋势,酶活性最高为371.663U/mgprot.暴露前期(6h)缢蛏2种组织中丙二醛(MDA)含量显著增加,鳃和内脏团中MDA含量最高值分别为5.030和10.705nmol/mgprot,后期逐渐平稳.IBR结果表明鳃中生物标志物对原油污染敏感度更高.原油暴露会使鳃丝结构发生变形或引起鳃丝脱离等现象.研究表明,缢蛏鳃更适宜作为潮间带原油暴露生物监测与评价的器官. 相似文献