超临界流体干燥
超临界流体干燥的相关文献在1995年到2022年内共计130篇,主要集中在化学工业、化学、一般工业技术
等领域,其中期刊论文100篇、会议论文15篇、专利文献193527篇;相关期刊68种,包括西安工业大学学报、材料导报、功能材料等;
相关会议15种,包括第十二届全国干燥会议、铜牛杯第九届功能性纺织品及纳米技术研讨会、第十一届全国耐火材料青年学术报告会等;超临界流体干燥的相关文献由237位作者贡献,包括汪厚植、余高奇、李青等。
超临界流体干燥—发文量
专利文献>
论文:193527篇
占比:99.94%
总计:193642篇
超临界流体干燥
-研究学者
- 汪厚植
- 余高奇
- 李青
- 梁丽萍
- 张敬畅
- 曹维良
- 高荫本
- 党淑娥
- 廖传华
- 曾翎
- 杨卓如
- 杨觉明
- 赵惠忠
- 孙少学
- 程江
- 刘秀兰
- 吴勘
- 季伟捷
- 张光德
- 张海礁
- 林英光
- 王成章
- 赵永祥
- 陈平
- 黄立新
- 于定新
- 张侃
- 李建平
- 李轩科
- 石锦华
- 计道珺
- 许岗
- 赵燕禹
- 陈懿
- 陈诵英
- 陈阳
- B·辛格
- K·A·潘
- R·苏布拉马尼亚姆
- 乔纳森·托伯特
- 于佳立
- 付霞
- 伊杰兹·杰弗里
- 何文
- 余秋兰
- 冯坚
- 刘万兵
- 刘喜宗
- 刘斌
- 刘昭铁
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刘秀兰;
马爱洁;
霍建国
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摘要:
ZAO(Aluminum-doped zinc oxide) shows excellent properties which relates nano-materials and oxide semiconductor .But the nano-powder forms aggregation easily with the decrease of powder size .To solve this problem ,“coprecipitation/supercritical fluid drying(SCFD)”is investigated .Adding in different surfactant during the process of coprecipitation supercritical fluid drying ,ZAO nanopowders are synthesized .XRD is employed for the analysis of phase .T EM is used to characterize the morphology , grain size and agglomeration state of ZAO powders .The effect of species and dosage of surfactant ,dosage of transition liquid on the properties of nano-powder was reviewed .Results show :When the molar ratio of surfactant PEG-400 and Zn2+ ion is 1∶16 ,ZAO powders are obtained with size smaller than 10 nm . Particle distribution shows that there no significant aggregation in ZAO powder .%ZAO(ZnO/Al2 O3复合氧化物)结合了纳米材料和半导体氧化物的优越性能,但随着粉体粒径的减小,粉体极易发生团聚.为解决纳米粉体的团聚现象,采用“共沉淀桘超临界流体干燥”结合法,加入几种不同的表面活性剂制备了ZAO超细纳米粉.实验通过X射线衍射对ZAO粉末物相进行分析.TEM 观察粒子的形貌、粒径大小及其团聚状态,分析了几种表面活性剂的种类及用量对粉末特性的影响.该方法有效地解决了粉体的团聚现象.研究结果表明:采用“共沉淀桘超临界流体干燥”技术,加入表面活性剂PEG桘400,且其与Zn2+离子的物质的量比为1∶16时,制备的ZAO粒子的平均粒度小于10 nm ,粉体粒径均匀,分散性好,团聚现象不明显.
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刘奋照;
王中慧;
薛玫;
霍宇平
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摘要:
采用尿素均相沉淀法结合CO2超临界干燥制备了1%Ce:YAG粉体,用XRD、BET、SEM和荧光分光光度计等测试手段对前驱体及煅烧样品进行表征。表明前驱体由非晶态的氢氧化物和碳酸盐组成,1100°C结晶产物为纯YAG相,未产生YAM、YAP等中间相,产物呈球形,分散均匀。与直接干燥样品相比,CO2超临界干燥样品的激发光谱和发射光谱强度均增加,并产生5 nm的红移。%Cerium-doped yttrium aluminum( Ce:YAG)precursor precipitates with 1% cerium contents were synthesized by homogeneous precipitation combined with supercritical carbon dioxide fluid drying. The calcined samples were characterized by XRD,BET,SEM and fluorescence spectrophotometer. The results showed that the obtained precursor consists of amorphous hydroxides and carbonates,and converted to pure YAG at 1 100 °C without the formation of interphase such as YAM and YAP. The resultant powders calcined at 1100 °C presented sphere with good dispersity. Compared with the conventional drying samples,the fluorescence spectra showed that the emission spectra and excitation spectra intensity of l% Ce:YAG powders obtained by supercritical carbon dioxide fluid drying increased,and the 5nm bathochromic-shift was detected.
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陈颖;
邢宸;
姬生伦;
梁宏宝
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摘要:
The HPA/Bi2WO6 was prepared with Na2WO4·2H2O, Bi(NO3)3·5H2O and different surfactant templates. The prepared sample was dried by the supercritical fluid drying (SCFD) method. It was characterized with XRD, FT-IR and SEM techniques and N2 sorption experiment. Its photocatalytic properties were evaluated with denitrification of nitrogen-containing simulated oil as model reaction. It was shown that the sodium dodecyl sulfate ( SDS ) should be chosen as template. With this template, a highly dispersed, crystalline and active photocatalyst was obtained. This catalyst had a larger specific surface area. The SCFD method effectively decreased pore collapse and particles agglomeration degree, consequently increasing the specific surface area and improving the catalytic performance. Immobilization of H3 PW12 O40 on Bi2 WO6 increased the surface acid sites, and hence the photocatalytic activity. When the H3 PW12 O40 loading was 10%, about 92. 08% of nitrogen in simulated oil were removed by shining for 3 h with a xenon lamp at the mcatalysts/msimulated oil ratio of 1:100.%以Na2WO4·2H2O和Bi(NO3)3·5H2O为原料,通过不同表面活性剂为模板剂对所制备催化剂的形貌进行调控,将调控形貌后的催化剂固载不同种类杂多酸(HPA),再进行超临界流体干燥制得HPA/Bi2WO6光催化剂。并采用X射线衍射( XRD)、紫外-可见漫反射( UV-vis)、扫描电镜( SEM)、比表面积测定仪( BET)对所制备的催化剂进行表征,通过含氮模拟油对固载杂多酸后的催化剂的脱氮性能进行评价。结果表明,十二烷基硫酸钠( SDS)能起到更好的模板导向作用,从而获得由二维纳米片组装成的三维中空花状结构。采用超临界流体萃取干燥技术对催化剂进行提纯干燥,可有效地避免孔塌陷、团聚等现象,进一步增大了催化剂的比表面积,其脱氮效果有了进一步的提高。固载磷钨酸能有效地提高催化剂的表面酸性位点,从而显著提高了催化剂的催化活性,磷钨酸固载量为10%、剂油比为1:100时、氙灯光照3 h脱氮率可达92.08%。
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陈颖;
邢宸;
姬生伦;
梁宏宝
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摘要:
以Na2WO4·2H2O和Bi(NO3)3·5H2O为原料,通过不同表面活性剂为模板剂对所制备催化剂的形貌进行调控,将调控形貌后的催化剂固载不同种类杂多酸(HPA),再进行超临界流体干燥制得HPA/Bi2WO6光催化剂。并采用X射线衍射(XRD)、紫外-可见漫反射(UV-vis)、扫描电镜(SEM)、比表面积测定仪(BET)对所制备的催化剂进行表征,通过含氮模拟油对固载杂多酸后的催化剂的脱氮性能进行评价。结果表明,十二烷基硫酸钠(SDS)能起到更好的模板导向作用,从而获得由二维纳米片组装成的三维中空花状结构。采用超临界流体萃取干燥技术对催化剂进行提纯干燥,可有效地避免孔塌陷、团聚等现象,进一步增大了催化剂的比表面积,其脱氮效果有了进一步的提高。固载磷钨酸能有效地提高催化剂的表面酸性位点,从而显著提高了催化剂的催化活性,磷钨酸固载量为10%、剂油比为1∶100时、氙灯光照3 h脱氮率可达92.08%。
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陈慧敏;
安琴友
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摘要:
Highly-dispersed ZrO2 nanoparticles (NPs) were successfully synthesized via sol-gel and supercritical fluid drying (SCFD) method with zirconium oxyehloride as the source. The as-synthesized ZrO2 was characterized by X-ray diffraction (XRD), high resolution transmission electron microscope (HRTEM), electrochemical impedance spectroscopy (EIS) and cyclic voltammetary (CV). The results indicate that the nearly spherical ZrO2 three-dimensional network NPs possess diameters of about 10nm, and the pure ZrO2 after SCFD treat ment maintains uniform crystal structure while the 3Y-ZrO2 have many crystal defects. The electrochemical performance of ZrO2 NPs showed that the pure ZrO2 NPs after SCFD treatment have very small electrochemical impedance and well-performance of cyclical stability, which provide a new orient of lithium batteries materials.%以ZrOCl2·8H2O为原料,结合溶胶凝胶法和超临界流体干燥技术制备了高分散纳米ZrO,粉体颗粒,通过X射线衍射仪(XRD)、高分辨透射电镜(HRTEM)、电化学阻抗谱(EIS)和循环伏安(CV)等技术手段研究探讨了ZrO2粉体颗粒的晶体缺陷、粉末晶粒尺寸大小及其电化学性能。成功地制备了粒径为10nm以下的近球形ZnO2三维网络纳米颗粒,实验结果表明。超临界流体干燥处理后的纯ZrO2晶粒基本保持完整,而3Y—ZrO2晶体缺陷较为明显。并首次对纯ZrO2的锂离子电化学性能作了一系列的初步研究,发现超临界流体处理后的ZrO2粉体具有很小的电化学阻抗;即使其作为锂离子电极材料容量可逆容量较低,但其多次循环后稳定性较好,这为锂离子电池材料的开发提供了新的思路。
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陈阳;
黄艳;
余高奇;
汪厚植;
赵慧忠;
张侃
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摘要:
Using cerium carbonate, lanthanum oxide and manganese nitrate as raw materials, Ce-La-Mn aerogel was prepared by sol-gel method combined with supercritical drying technology, and ultrafine particles of Ce-La-Mn mixed oxides were got after heat treatment at 850°C. The prepared materials were characterized by TG-DTA, XRD, FT-IR and TEM. The catalytic properties of ultrafine Ce-La-Mn mixed oxides were tested by reaction "2CO+2NO= 2CO2 +N2". The key aim was to examine the effect of supercritical fluid drying technology and Ce-doping on ultrafine Ce-La-Mn mixed oxides' crystal structure, morphology and catalytic activity. The results show; at 260°C, Ce-La-Mn mixed oxides was brown loose flocculent powder with good dispersibility. The particles were spherical about 10nm in size. The main crystal components were CeO2, MnO, La5O7NO3 and La(OH)2NO3, After thermal treating at 850°C, Ce-La-Mn mixed oxides were made up of lots of quasi-global grains smaller than 20nm;the main crystal components of the Ce-La-Mn mixed oxides were LaMnO3+λ La2 O3 and CeO2 heat treatment could enhance the crystallinity of the materials. Ce-doping increased the oxygen vacancies of LaMnOs+λ lattice, improved the condition of redox catalysis, effected the migration of the perovskite lattice oxygen and advanced the catalysis activity of Ce-La-Mn mixed oxides.%以碳酸铈、氧化镧和硝酸锰为主要原料,采用“溶胶-凝胶”法结合“超临界流体干燥”技术获取Ce-La-Mn气凝胶,在850°C热处理制备Ce-La-Mn混合氧化物,并采用TG-DTA、XRD、FT-IR和TEM进行表征,用“2CO+2 NO=2CO2+ N2”特征反应测试超细粒子的催化活性,考察超临界流体干燥技术与铈掺杂对超细Ce-La-Mn 混合氧化物的结构、形貌和催化活性的影响.结果显示:经260°C超临界流体干燥得到的Ce-La-Mn气凝胶为分散性好的棕色絮状粉末,由大量直径小于10nm的球型颗粒组成,晶相为CeO2、MnO、La5O7NO3和La(OH)2NO3;经850°C热处理得到的Ce-La-Mn混合氧化物的粒径约为20nm,晶相为LaMnO3+λ、La2O3和CeO2;铈掺杂增加了LaMnO3+λ晶格中氧空缺数量,改善了催化的气氛条件,提高了Ce-La-Mn混合氧化物的催化活性.
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安琴友;
陈慧敏;
石赞
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摘要:
The preparation of Nano Zirconia powder with the supercritical fluid drying (SCFD) method in different heat treatment process and the sample analysis of TEM and XRD results show that the heat temperature and time on properties of Nano-ZrO2 powders effect is significant. With the increase of heat treatment temperature and time, powder transition from t phase to m phase, grain size is gradually increasing, but heat treatment temperature greatly has the more effect on the ZrO2phase composition and grain size than time.%用超临界流体干燥法制备了纳米ZrO2粉体,并用不同热处理工艺进行处理,之后对样品进行TEM和XRD分析.结果表明,煅烧温度和煅烧时间对纳米ZrO2粉体性能的影响是显著的.随着煅烧温度的提高和时间的延长,粉体由t相转变为m相,晶粒尺寸逐渐增大,但是煅烧温度对ZrO2相组成和晶粒尺寸的影响比时间的影响更大.
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龚圣;
周新华;
尹国强;
宋光泉;
李翠金;
杨卓如
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摘要:
After antimony doped tin oxide (ATO) precursors were prepared by the sol-gel method, oven drying, microwave drying, vacuuming drying and supercritical fluid drying (SCFD) were used to treat the alcogels of ATO precursors. Weakly agglomerated nano-sized ATO particles with tetragonal phase structure were obtained after dry precursors were annealed at 600°C under atmosphere. The nanoparticles were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM),transmission electron microscopy (TEM) and Malvern Zen1600 Zeta sizer. The results showed that ATO particles with tetragonal phase structure were all well crystallized from four drying processes. However,only the ATO powder prepared by SCFD consisted of primary particles weakly attached to each other, and the average size was around 25 nm. The mechanism was that the particles of precursors could keep loose morphology after treatment by SCFD, which was the key to preparing weekly agglomerated nano-sized ATO particles. In conclusion, it was an effective way to avoid the nano-sized ATO agglomeration by SCFD process in the sol-gel method.%采用溶胶-凝胶法制备纳米锑掺杂氧化锡(antimony doped tin oxide,ATO)前驱体,然后通过烘干、微波、真空以及超临界流体干燥(supercritical fluid drying,SCFD)等方式干燥醇凝胶,并在600°C下进行热处理,考察干燥方式对最终产物纳米ATO团聚情况的影响.利用XRD、SEM、TEM、马尔文粒度仪等对前驱体以及纳米ATO的结构、形貌等进行表征,结果表明:采用4种方式对前驱体醇凝胶进行干燥,以SCFD处理得到的前驱体结构最为疏松,ATO颗粒呈不规则球形、粒度较为均匀,平均粒径约25nm.通过对常规干燥过程导致团聚以及SCFD消除前驱体粒子团聚的机理分析,揭示了采用超临界流体干燥醇凝胶能够使前驱体粒子保持松散的结构,并最终获得粒径小、分散性好的纳米ATO粉体,是消除纳米ATO粉体的团聚的有效途径.
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付霞;
余高奇;
陈阳;
张侃;
汪厚植;
张光德
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摘要:
以La2O3和Co(NO3)·26H2O为主要原料,用"超临界流体干燥"技术结合"溶胶-凝胶"法制各超细镧-钴混合氧化物.采用 TG-DTA、XRD、FT-IR、TEM等手段进行表征;考察了超临界流体干燥技术对混合氧化物晶态和形貌的影响;并通过"2NO+2CO=N2+2CO2"的反应测试混合氧化物的催化活性.结果显示,260°C时,经超临界流体干燥得到的镧-钴混合氧化物为疏松、絮状且有较好分散性的棕色粉末,由大量直径小于10nm的球形小颗粒组成;850°C热处理后,镧-钴混合氧化物主要由晶态的LaCoO3、La2O3和非晶态的Co2O3组成;球形颗粒出现一定程度的团聚.粒径介于15~35nm;稀土镧影响了镧-钴混合氧化物中钴氧化物的晶化.
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朱小文;
吴广明;
周斌;
倪星元;
沈军
- 《第五届全国超临界流体技术学术及应用研讨会》
| 2004年
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摘要:
超临界流体干燥技术是制备具有高比表面积、孔体积、较低密度和低热导率的块状气凝胶的重要途径之一.本文采用廉价的工业级多聚硅E-40为硅源,通过溶胶-凝胶法,以乙醇为干燥介质在超临界条件下制备具有纳米多孔结构的块状SiO气凝胶,用扫描电镜和孔径分布仪对其结构进行了表征,采用Hot Disk热学测试仪对气热学特性进行了测试,结果显示,该气凝胶为纳米多孔结构,孔径在20nm附近,热导率在0.022E/m.k~0.023W/m.k之间.通过超临界流体干燥法制备的块状SiO气凝胶是一种轻质高效的绝热材料,具有广泛的应用前景.
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- 《第十一届全国耐火材料青年学术报告会》
| 2008年
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摘要:
以氧氯化锆和硝酸铈为起始原料,以氨水为沉淀剂,用共沉淀法-溶胶-凝胶方法结合喷雾干燥、真空冷冻干燥和超临界流体干燥技术制备了铈稳定四方氧化锆纳米级超微粉体,用热重-差示扫描量热计(TG-DSC)、X射线衍射分析(XRD)、物理吸附仪(Autosorb-MP-1)等着重就制备方法对粉体的表面性能、孔径分布、晶粒尺寸和相对结晶度等影响进行了研究.结果表明,3种不同的制备方法制得的初始粉体表观颗粒尺寸分别为6.19,7.05,2.27 nm,比表面积分别为162.88,143.00,444.50m2/g.从室温到900°C,随着煅烧温度的升高,喷雾干燥法和真空冷冻干燥法制备的试样颗粒度显著粗化,而SCFD法制备的粉体粒度粗化则较慢.粉体材料的晶化温度、堆积密度、相对结晶度和孔体积随制备方法的不同均存在较大的差异.
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袁善录
- 《第4届全国工业催化技术及应用年会》
| 2007年
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摘要:
超微粒(UFP)由于比表面积大、活性高和无内扩散等优点广泛应用于催化各个领域。采用超临界流体干燥法(SCFD)制备了Fe基UFP催化剂,将其置于F-T合成浆态床中进行催化性能评价,对操作条件如还原温度、反应温度、最佳转速、合成气流速和反应压力等进行探讨,找出相应规律,并对其物理结构进行研究。浆态床由于无局部过热的特点,使UFP性能得到充分体现,有很好的发展前景。
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杨大祥;
冯坚;
周新贵;
张长瑞;
王娟
- 《第五届中国功能材料及其应用学术会议》
| 2004年
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摘要:
以正硅酸乙酯、异丙醇、去离子水为原料,盐酸、氨水为催化剂,采用溶胶-凝胶、旋转涂胶、老化及超临界流体干燥工艺制备纳米多孔氧化硅薄膜.研究了溶胶-凝胶工艺的影响因素,考察了溶胶粘度和匀胶转速对成膜性能的影响,采用扫描电镜表征了薄膜的表面形貌和截面结构,用椭偏仪表征了薄膜的孔隙率、介电常数以及厚度等性能参数,分析了薄膜的结构和红外特性.
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赵燕禹;
郑文裕;
商连弟
- 《中国化工学会无机酸碱盐专业委员会2003年无机盐学术年会》
| 2003年
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摘要:
本文以硼砂和氯化钙为原料,采用超临界流体干燥技术(Supercritical Fluid Drying简称SCFD)制备纳米级硼酸钙.其过程主要包括制备水溶液中的胶体,经过过滤,用正丁醇、石油醚的混合溶液置换胶体中的水,然后进行超临界干燥.考察了制备沉淀过程中的反应物浓度和干燥条件对硼酸钙粒径大小的影响.采用SCFD技术可制备出大孔、高比表面积、低密度气凝胶超细粉.采用吸附法对其物性进行了表征测定.该方法制备的纳米级硼酸钙超细粉体,表观堆积密度可达到0.13g/ml,比表面积可达到388.8m/g.
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王永钊;
赵永祥;
许临萍;
刘滇生
- 《中国稀土学会第十届全国稀土催化学术会议》
| 2003年
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摘要:
本文以硝酸铈和正硅酸乙酯为原料,采用溶胶凝胶超临界流体干燥法制备了不同CeO含量的一系列复合氧化物.利用物理吸附仪,XRD,IR等手段对复合氧化物的织构和结构进行了表征,结果发现:采用该法可制备高比表面积的CeO-SiO复合氧化物,随着CeO含量的增加,复合氧化物的比表面积逐渐降低;CeO的结晶逐渐完善.最后对5CS复合氧化物负载Pd的催化活性进行了初步研究,发现其具有CO低温氧化活性.
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梁丽萍;
党淑娥;
高荫本
- 《第三届全国环境催化学术会议》
| 2003年
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摘要:
采用凝胶-超临界流体干燥工艺制备无团聚ZrO(CaO)超微粉体,考察ZrO(CaO)及M/ZrO(CaO)催化剂对CO完全氧化反应的催化活性.研究发现,超临界流体干燥可以有效地防止凝胶干燥过程中硬团聚体的生成,从而获得高比面积、大孔体积、小粒径且具有良好单分散性能的ZrO(CaO)粉末.作为催化剂活性组分及载体,超微ZrO(CaO)在CO完全氧化反应中表现出优良的性能.未担载任何活性组分的超微ZrO(CaO)是CO完全氧化反应的高温催化剂,其50%转化温度约为280°C,100﹪转化温度为550°C;以超微ZrO(CaO)粉体作载体,担载Ni,Cu和Pd的负载型催化剂对CO低温氧化表现出较高的催化活性.
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