柴油尾气DOC催化剂Pt-Pd/CeO2的活性和抗硫性

采用浸渍法制备了不同Pt、Pd比例的Pt-Pd/CeO₂催化剂,考察了其催化氧化模拟柴油车尾气的活性,并测试了抗硫性。活性测试结果表明,Pt、Pd协同降低了催化剂的起燃温度,其比例对催化剂性能影响很大,其中,Pt_0.2Pd_0.8/CeO₂催化剂在模拟柴油车尾气(丙烯(C₃H₆)、一氧化碳(CO)和一氧化氮(NO))中的催化活性最高;C₃H₆的t₅₀降到170℃,CO的t₅₀降到了150℃,显示了良好的Pt、Pd协同效应;H₂-TPR表征和抗硫性结果分析表明,高比例Pt/Pd催化剂具有更多的表面活性氧,其相对数值与催化剂抗硫性能的关联度高,在催化剂硫酸盐中毒的条件下,更有利于催化反应的进行。     

乙烯在钯圆盘电极的电化学氧化研究（英文）

由于巨大的潜在市场,乙烯的电化学氧化受到愈来愈多的关注。目前,主流的电化学氧化法仍以依赖于氧化还原媒介的介导氧化法为主,而这些媒介的使用在电解过程中产生大量的腐蚀性中间体,使其实际应用受到阻碍。直接电氧化法可有效规避此问题,但又受到低活性和低选择性的限制。在本工作中,我们针对目前最先进的钯催化直接氧化体系,在中性条件下开展了一系列电化学研究,以对该过程的机理获取更深入的认识。在氮气和乙烯氛围下,钯电极的循环伏安谱图有显著区别。我们发现电解过程中生成的Pd(Ⅱ)物种在乙烯氛围下可绕过原本的电化学还原路径,通过一个化学步还原为Pd(0),因此可能是乙烯氧化的活性位点。Pd(Ⅱ)物种所对应的还原峰也因此可作为乙烯吸附的数量的指标。通过电化学脉冲序列的设计,我们在钯催化剂上识别了两种具有不同吸附强度的乙烯,其强、弱吸附模式所对应的电荷转移比例约为0.3:1。弱吸附的乙烯在钯电极表面表现出可逆的吸脱附行为,而具有强吸附模式的乙烯无法通过物理过程脱附,可能指向到乙烯深度氧化过程。这项工作为进一步设计高性能乙烯直接电氧化催化剂提供了设计思路和方向。     

焙烧温度对Pd-Cu/凹凸棒土CO常温催化氧化性能的影响

以凹凸棒土(APT)作载体,采用等体积浸渍法制备了Pd-Cu/APT催化剂,以CO氧化为探针反应,在连续流动微反装置上,考察了焙烧温度对催化剂CO常温催化氧化性能的影响。通过N2-物理吸附、XRD、TG、FT-IR和H2-TPR等手段对催化剂的结构和性质进行了表征。结果表明,随焙烧温度升高,Pd-Cu/APT中载体逐步脱水,进而引起催化剂结构和织构变化,其中,Cu物种由Cu(OH)Cl逐渐向CuO转变,同时,高分散的Pd物种与Cu物种间相互作用先增强后减弱。经300℃焙烧的催化剂比表面积大,Cu物种以Cu(OH)Cl形式存在,且具有良好的分散状态,与Pd物种之间产生较强的相互作用,显著提高了其还原性能。在空速6 000 h-1、CO体积分数0.5%、水蒸气体积分数3.3%的反应条件下,常温可将CO完全转化800 min以上。焙烧温度高于或低于300℃均引起CO常温催化氧化性能的下降。     

Effect of Support Calcination Temperature on Ag Structure and Catalytic Activity for CO Oxidation

SiO₂ with different nanostructures, namely hexagonal mesoporous silica(HMS), and three unordered commercial silica, were used as supports to fabricate silver catalysts using an incipient wetness impregnation method. It was found that Ag/HMS catalyst showed a high catalytic activity. Next, the HMS support was calcined at different temperatures before impregnation of AgNO₃. The effect of calcination temperature of HMS support was investigated in terms of structure and catalytic activity of Ag catalysts. The support and catalysts were characterized by N₂ adsorption-desorption isotherms, Thermogravimetric-differential thermal analyzer, X-ray diffraction, H₂-temperature program reduction and transmission electron microscopy. The results showed that calcination of HMS at an appro- priate temperature(750℃) before catalyst preparation would benefit the formation of highly dispersive small sized Ag particles on the HMS support and markedly enhance the catalytic activity of Ag/HMS catalyst toward CO oxidation.     

富氧条件下Fe-Mn/Beta选择性催化丙烯还原氮氧化物

以Beta分子筛为载体，采用等体积浸渍法制备Fe-Mn/Beta催化剂，并对其在富氧条件下丙烯选择性催化还原NO性能进行了研究。通过N₂吸附-脱附、X射线衍射（XRD）、X射线光电子能谱（XPS）、透射电子显微镜（TEM）、程序升温还原（H₂-TPR）和原位漫反射傅里叶变换红外光谱（in-situ DRIFTS）等研究手段对催化剂进行表征，考察Mn组分对催化剂的物理化学性质、C₃H₆-SCR反应活性和反应中间产物的影响。结果表明，引入Mn物种可以显著提高Fe-Mn/Beta催化剂的低温催化活性，1.5Fe1.0Mn/Beta催化剂NO还原效率350℃最高可达99.4%，在250-400℃反应温度下显示出很高的反应活性和N₂选择性。原位红外光谱研究表明，分子筛离子交换位上孤立的铁离子是丙烯选择性氧化的主要活性位，分散良好的MnO₂物种不能提高催化剂对丙烯的活化能力，但有助于促进形成NO₂吸附物种，从而提升了Fe-Mn/Beta催化剂的低温C₃H₆-SCR性能。经高温水热老化处理后，Fe-Mn/Beta催化剂脱硝活性明显下降，这与孤立的Fe³⁺离子迁移形成Fe_xO_y团聚物种有关。     

CuO/ZrO_2催化水煤气变换反应制氢:ZrO_2载体焙烧温度的影响

以经不同温度(120、250、350、450℃)焙烧处理的ZrO_2为载体,采用沉积-沉淀法制备了系列CuO/ZrO_2催化剂;考察了富氢气氛下催化剂的水煤气变换反应(WGS)催化性能。结果表明,CuO/ZrO_2催化剂的催化活性随ZrO_2载体焙烧温度的升高呈现先升高后降低的"火山型"变化趋势,在焙烧温度为250℃时取得最高值。采用X射线粉末衍射、N_2物理吸附-脱附、N_2O滴定、H_2程序升温还原和CO程序升温还原及质谱跟踪等技术研究了系列ZrO_2载体及CuO/ZrO_2催化剂的结构和还原性能。结果表明,随着ZrO_2焙烧温度的升高,一方面,CuO/ZrO_2催化剂的Cu分散度逐渐降低,与ZrO_2具有强相互作用的高分散活性Cu-[O]-Zr物种("[]"表示ZrO_2表面氧空位)逐渐减少;另一方面,Cu-[O]-Zr物种的还原能力逐渐增强,并诱导催化剂活性表面羟基的还原能力也相应增强(CO为还原剂),即降低了催化剂对WGS反应的起活温度。两方面的综合作用使得ZrO_2载体焙烧温度为250℃(中等温度)时,CuO/ZrO_2催化剂的WGS催化活性最高。     

富氧条件下贵金属催化剂上丙烯选择性还原NO研究

用溶胶-凝胶(Sol-gel)法制备了以γ-Al₂O₃为载体,以Pt,Pd和Rh等为活性组分的单组分及双组分催化剂,在稀燃汽油机条件下评价了丙烯对NO的选择性催化还原活性.结果表明,在单组分催化剂中,催化剂的活性及顺序为Rh(73%)>Pt(65%)>Pd(47%),最高活性对应的温度分别为Pt(225℃),Pd(275℃)和Rh(375℃),N₂选择性顺序为Rh,Pd(>80%)>Pt(48%),氧化性顺序为Pt>Rh>Pd.Sol-gel制备的双组分催化剂中的不同贵金属活性位具有一定的协同效应,可明显拓宽活性温度范围,其中以Pt-Rh组合活性最好.Rh/Al₂O₃和Pt/Al₂O₃两种催化剂分层有序填装时,可提高C₃H₆的利用率,在200～450℃范围内,可有效地催化净化NO.     

焙烧温度对微乳液法负载铂制备的Pt-S2O82-/ZrO2-Al2O3催化剂异构化性能的影响

过微乳液法负载Pt制备了Pt-S₂O₈^2-/ZrO₂-Al₂O₃(Pt-SZA-X) 催化剂,并采用XRD、BET、FT-IR、TPR、TEM等手段对催化剂进行了表征。以正戊烷异构化反应为探针,考察了焙烧温度对催化剂异构化性能的影响。结果表明,焙烧温度对Pt-SZA-X的还原温度影响不大,但催化剂表面S含量随着焙烧温度的升高而下降;焙烧温度为600~650℃时形成O=S=O结构,此时S与催化剂载体结合比较稳定;焙烧温度为650℃时,可得到单一的ZrO₂四方晶相,焙烧温度高于650℃时,比表面积迅速降低,催化剂表面S⁶⁺流失严重。在不同温度下焙烧得到的催化剂中,经650℃焙烧的催化剂具有适宜的超强酸位和比表面积,异构化活性最高。在反应温度为230℃、反应压力2.0 MPa、氢烃物质的量比4:1、质量空速1.0 h^-1时,催化异戊烷产率达到60.8%。     

载体焙烧温度对Rh-Mn-Li/SBA-15催化CO加氢性能的影响

SBA-15分别于550、700、800和900℃进行焙烧,然后以等体积共浸渍法将Rh、Mn和Li负载其上。催化剂的性能用CO加氢反应进行评价。催化剂分别用N₂物理吸附、X射线衍射、透射电子显微镜、H₂化学吸附和傅里叶变换红外光谱进行表征。即使在900℃下进行焙烧,SBA-15的结构仍得到保持。但是,当焙烧温度从550℃升高到900℃,SBA-15的比表面积、孔径和总孔容分别从842.6 m²·g^-1、9.57 nm和1.18 cm³·g^-1降到246.4 m²·g^-1、5.62 nm和0.34 cm³·g^-1。此外,Rh颗粒的尺寸都在1.5-4.0 nm范围内,并且随着载体的焙烧温度增加而增加。另外,Rh颗粒更倾向位于高温焙烧载体的介孔内,这可能是因为经过高温焙烧,载体微孔下降。所以,H₂和CO更易与负载在高温焙烧后的载体上的Rh颗粒接触。因此,当载体焙烧温度达到900℃时,Rh-Mn-Li/SBA-15催化剂有非常高的C₂₊含氧化合物的活性和选择性。     

不同组成和结构LaMnO_3钙钛矿负载Au催化剂的CO氧化活性

采用乙二醇溶胶-凝胶法制备了计量比LaMnO_3和非计量比LaMn_(1.2)O_3钙钛矿,并利用稀硝酸处理LaMnO_3制备得到LaMnO_3-AE,然后采用沉积沉淀法制备钙钛矿负载Au催化剂,以考察载体的结构和性质对Au的热稳定性以及催化剂活性的影响。通过X射线衍射(XRD)、透射电镜(TEM)、X射线光电子能谱(XPS)和H_2程序升温还原(H_2-TPR)等表征,发现LaMnO_3和LaMn_(1.2)O_3钙钛矿载体虽然有利于Au的分散,但是Au的热稳定性相对较差。相反,经稀硝酸刻蚀的LaMnO_3钙钛矿(LaMnO_3-AE)不利于Au的分散,但是有利于提高Au的热稳定性。在CO氧化反应中,当催化剂在低于500°C焙烧时,LaMn_(1.2)O_3钙钛矿负载Au催化剂的活性要显著高于LaMnO_3和LaMnO_3-AE负载Au催化剂的活性,而当催化剂焙烧温度升高至700°C以上时,LaMnO_3-AE负载Au催化剂却要显著优于LaMnO_3和LaMn_(1.2)O_3钙钛矿负载Au催化剂的活性。     

Promoting Effects of Iron on CO Oxidation over Au/TiO2 Supported Au Nanoparticles

Fe-doped TiO₂ supported gold nanoparticles as high-performance CO oxidation catalysts were prepared. XRD data revealed that TiO₂ support was in an anatase phase. After calcination at 300℃, the sample showed nanotube structure, and the size of gold nanoparticles was 3.1 nm. When calcined at 500℃, most nanotubes broke, and gold nanoparticles grew up to 5.9 nm. XPS spectrum indicated the presence of Fe in the +3 oxidation state. Au/Fe-TiO₂(Au:1.44%, Fe:1.35%) calcined at 300℃ possessed the best catalytic activity, and it could completely convert CO at 25℃. The temperature of 100% CO conversion(T_100%) of Fe-free catalyst was 40℃. After the catalysts were stored at room temperature for 7 d, T_100% of Au/Fe-TiO₂ increased from 25℃ to 30℃, while T_100% of Fe-free catalyst increased from 40℃ to 80℃. The catalytic activity and storage stability of Au/TiO₂ could be improved by Fe-doping. The increase of specific surface area, generation of oxygen vacancies and new adsorption sites, depression of the growth of gold nanoparticles, and strong metal-support interaction were responsible for the promoting effect of iron on the catalytic performance of Au/TiO₂ for CO oxidation.     

LaSrCo0.9B’0.1O4复合氧化物制备、氧化性能及表征

采用聚丙烯酰胺法制备了类钙钛矿LaSrCo_0.9B’_0.1O₄系列复合氧化物(B’= Mn、Fe、Ni、Cu)和LaSrCoO₄,并考察了对CO和C₃H₈催化氧化反应的活性,运用XRD、BET、TEM、TPD等方法对LaSrCo_0.9Ni_0.1O₄、LaSrCoO₄进行了表征.结果表明, LaSrCo_0.9Ni_0.1O₄和LaSrCoO₄都为四方K₂NiF₄型纳米材料. Ni的掺入提高了LaSrCoO₄的催化活性、O₂的吸附量和晶格畸变率,降低了平均晶粒度.     

Cr2O3气相催化1,1,2-三氯乙烷脱HCl性能

采用沉淀法制备了不同焙烧温度的Cr₂O₃催化剂,用于1,1,2-三氯乙烷(TCE)气相脱氯化氢制备二氯乙烯的反应。 采用X射线衍射(XRD)、氢气程序升温还原(H₂-TPR)、氨气程序升温脱附(NH₃-TPD)、X射线光电子能谱(XPS)表征手段,研究了Cr₂O₃催化剂气相催化裂解TCE脱氯化氢反应及其反应机理。 结果表明,Cr₂O₃催化剂上TCE气相脱氯化氢反应的转化率随着催化剂焙烧温度的升高逐渐降低,然而顺-1,2-二氯乙烯(cis-DCE)的选择性先增大后减小。 400 ℃焙烧的Cr₂O₃催化剂催化性能最好,TCE转化率为70.8%,顺-1,2-二氯乙烯的选择性为90.0%。 然而,催化剂的单位面积反应速率随着焙烧温度升高先提高后下降,400 ℃焙烧催化剂的单位面积反应速率为0.801×10^-2 μmol/(s·m²)。 催化剂的单位面积反应速率和顺-1,2-二氯乙烯(cis-DCE)的选择性与催化剂表面Cr₂O₃物种具有很好的对应关系,表明催化剂表面Cr₂O₃物种有利于脱氯化氢反应。 以酸中心为活性中心计算得到的转换频率(TOF)变化趋势与单位面积反应速率相一致,400 ℃焙烧的催化剂的TOF为2.82×10^-5 s^-1,表明Cr₂O₃催化剂Cr物种合适的平均价态(~3.20)有利于脱氯化氢反应。     

Catalytic behaviors of Co-Mn/TiO2 catalysts for Fischer-Tropsch synthesis

The 15%(Co-Mn)/TiO₂,(Co/Mn=1/6) catalyst was prepared using fusion procedure and studied for the conversion of synthesis gas to C_2~4 olefins. The effects of calcination conditions and operation conditions such as the H₂/CO molar feed ratio at different temperatures, gas hourly space velocity (GHSV) and total reaction pressure on the catalytic performance of catalyst were investigated. The stability of the catalyst during 150 h at optimal operation conditions (t=250 ℃ H₂/CO=2/1, GHSV=1 500 h^-1 and p=0.3 MPa) has been investigated. It is found that this catalyst is high stable for production C_2~4 olefins. Characterizations of both precursors and calcined catalysts by powder X-ray diffraction, scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) specific surface area measurement and thermal analysis methods such as thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) show that the different preparation method influences the catalyst precursor structure and morphology.     

焙烧温度对TiO2-ZrO2复合氧化物性质及其对十八醇脱水制十八烯反应性能的影响

通过在ZrO_2中掺杂TiO_2,并在350-500℃下焙烧,制备了系列TiO_2-ZrO_2复合氧化物催化剂,将其应用于十八醇脱水制十八烯反应。随焙烧温度的升高,催化剂表面的Lewis酸性位量逐渐增加,450℃焙烧的催化剂Lewis酸性位量最多,焙烧温度继续升高则Lewis酸性位量降低;催化剂中未发现Br?nsted酸性位。焙烧温度≤400℃的TiO_2-ZrO_2复合氧化物形成Ti-O-Zr键,呈无定形态;焙烧温度400℃的TiO_2-ZrO_2复合氧化物呈单斜相和四方相ZrO_2晶型。晶相结构和酸性位量综合影响催化剂的十八醇脱水性能,具有单斜相和四方相ZrO_2晶型的催化剂上酸性位活性很低,具有无定形相的催化剂上酸性位活性显著增加,400℃焙烧的催化剂1-十八烯收率最高。     

利用ZnO@ZIF-8核壳结构构建高选择性、高稳定性的Pd/ZnO催化剂用于CO2加氢制甲醇

Catalytic CO₂ hydrogenation to methanol is a promising route to mitigate the negative effects of anthropogenic CO₂. To develop an efficient Pd/ZnO catalyst, increasing the contact between Pd and ZnO is of the utmost importance, because "naked" Pd favors CO production via the reverse water-gas shift path. Here, we have utilized a ZnO@ZIF-8 core-shell structure to synthesize Pd/ZnO catalysts via Pd immobilization and calcination. The merit of this method is that the porous outer layer can offer abundant "guest rooms" for Pd, ensuring intimate contact between Pd and the post-generated ZnO. The synthesized Pd/ZnO catalysts (PZZ8-T, T denotes the temperature of calcination in degree Celsius) is compared with a ZnO nanorod-immobilized Pd catalyst (PZ). When the catalytic reaction was performed at lower reaction temperatures (250, 270, and 290 ℃), the highest methanol space time yield (STY) and highest STY per Pd achieved by PZ at 290 ℃ were 0.465 g g_cat^-1 h^-1 and 13.0 g g_Pd^-1 h^-1, respectively. However, all the PZZ8-T catalysts exhibited methanol selectivity values greater than 67.0% at 290 ℃, in sharp contrast to a methanol selectivity value of 32.8% for PZ at the same temperature. Thus, we performed additional investigations of the PZZ8-T catalysts at 310 and 360 ℃, which are unusually high temperatures for CO₂ hydrogenation to methanol because the required endothermic reaction is expected to be severely inhibited at such high temperatures. Interestingly, the PZZ8-T catalysts were observed to achieve a methanol selectivity value of approximately 60% at 310 ℃, and PZZ8-400 was observed to maintain a methanol selectivity value of 51.9% even at a temperature of 360 ℃. Thus, PZZ8-400 attains the highest methanol STY of 0.571 g g_cat^-1 h^-1at 310 ℃. For a better understanding of the structure-performance relationship, we characterized the catalysts using different techniques, focusing especially on the surface properties. X-ray photoelectron spectroscopy (XPS) results indicated a linear relationship between the methanol selectivity and the surface PdZn : Pd ratio, proving that the surface PdZn phase is the active site for CO₂ hydrogenation to methanol. Furthermore, analysis of the XPS O 1s spectrum together with the electronic paramagnetic resonance results revealed that both, the oxygen vacancy as well as the ZnO polar surface, played important roles in CO₂ activation. Chemisorption techniques provided further quantitative and qualitative information regarding the Pd-ZnO interface that is closely related to the CO₂ conversion rate. We believe that our results can provide insight into the catalytic reaction of CO₂ hydrogenation from the perspective of surface science. In addition, this work is an illustrative example of the use of novel chemical structures in the fabrication of superior catalysts using a traditional formula.     

功能化氮化碳对Pd基甲酸分解制氢催化剂性能的促进作用

负载型Pd基催化剂是最有效的甲酸分解(FAD)制氢催化剂之一,其中氮化碳载体的N含量较高,但是通常一步热解法制备的氮化碳为块状,难以有效分散表面金属纳米粒子(NPs)。 本文通过将尿素前驱体在溶剂化作用后热解得到功能化氮化碳,以此为载体,利用阴离子交换和硼氢化钠直接还原法制备了功能化氮化碳负载的Pd基催化剂(Pd/C₃N₄-F)。 通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)和X射线光电子能谱(XPS)对材料结构进行表征,并通过气体质量流量计测试了催化剂的性能。 Pd/C₃N₄-F具有优异的催化FAD制氢性能,30 ℃下的初始TOF(总转换频率)值和质量比活性分别为1824 h^-1和17.14 mol_H2/(g_Pd·h)。 对产物的气相色谱分析结果也表明没有副产物CO生成,表明催化剂具有优异的选择性。 并且随着温度的升高(30～40 ℃),催化剂性能逐渐提高。     

The direct synthesis of dimethyl ether from syngas over hybrid catalysts with sulfate-modified γ-alumina as methanol dehydration components

A series of γ-Al₂O₃ samples modified with various contents of sulfate (0–15 wt.%) and calcined at different temperatures (350–750 °C) were prepared by an impregnation method and physically admixed with CuO–ZnO–Al₂O₃ methanol synthesis catalyst to form hybrid catalysts. The direct synthesis of dimethyl ether (DME) from syngas was carried out over the prepared hybrid catalysts under pressurized fixed-bed continuous flow conditions. The results revealed that the catalytic activity of SO₄²⁻/γ-Al₂O₃ for methanol dehydration increased significantly when the content of sulfate increased to 10 wt.%, resulting in the increase in both DME selectivity and CO conversion. However, when the content of sulfate of SO₄²⁻/γ-Al₂O₃ was further increased to 15 wt.%, the activity for methanol dehydration was increased, and the selectivity for DME decreased slightly as reflected in the increased formation of byproducts like hydrocarbons and CO₂. On the other hand, when the calcination temperature of SO₄²⁻/γ-Al₂O₃ increased from 350 °C to 550 °C, both the CO conversion and the DME selectivity increased gradually, accompanied with the decreased formation of CO₂. Nevertheless, a further increase in calcination temperature to 750 °C remarkably decreased the catalytic activity of SO₄²⁻/γ-Al₂O₃ for methanol dehydration, resulting in the significant decline in both DME selectivity and CO conversion. The hybrid catalyst containing the SO₄²⁻/γ-Al₂O₃ with 10 wt.% sulfate and calcined at 550 °C exhibited the highest selectivity and yield for the synthesis of DME.     

K/MgFeZn-HTLcs催化CO加氢制低碳烯烃性能研究

以MgFeZn-HTLcs为前驱体,制备了不同Mg/Fe/Zn物质的量配比、K改性的K/MgFeZn-HTLcs催化剂,用于CO加氢直接制低碳烯烃反应。采用N2吸附-脱附、SEM、TG、XRD、XPS、H_2-TPR等手段对催化剂进行了表征。结果表明,MgFeZnHTLcs前驱体具有典型的层状结构,孔径分布均一;经焙烧、K改性后仍具有一定的层状结构,但比表面积显著减小,平均孔径增大;新鲜催化剂物相以金属氧化物和铁酸盐为主,反应后K/MgFeZn-HTLcs催化剂主要以Fe_5C_2、MgCO_3和ZnO相存在,K/2Fe-1Zn催化剂主要物相为ZnFe2O_4。在CO加氢反应中,K/MgFeZn-HTLcs催化剂具有较高的C=2-4烯烃选择性和较低的C+5含量,与K/2Fe-1Zn催化剂相比,产物分布明显改善;K/2Mg-2Fe-1Zn催化剂上O/P比值达5.15,C=2-4含量占总烃质量的48.56%。     

Pd/La_(0.8)Ce_(0.2)MnO_3/ZSM-5的制备及其甲苯催化燃烧活性

以贵金属改性的钙钛矿为活性组分,通过等体积浸渍法制备了Pd/La0.8Ce0.2MnO3/ZSM-5催化剂,并采用XRD、BET、SEM和H2-TPR等技术对催化剂进行了表征。在固定床反应器上,对Pd/La0.8Ce0.2MnO3/ZSM-5催化剂上的甲苯为目标污染物的催化燃烧进行了研究,考察了焙烧温度、负载量及ZSM-5的性质对其催化活性的影响。结果表明,所得到Pd/La0.8Ce0.2MnO3催化剂仍保持钙钛矿型结构,Pd均匀的分布在催化剂表面,有利于催化剂活性的提高。当ZSM-5硅铝原子比为25、La0.8Ce0.2MnO3负载量为20%、焙烧温度为750℃时,La0.8Ce0.2MnO3/ZSM-5上甲苯的起燃温度和完全转化温度分别为200和279℃;加入0.3%的Pd后,Pd/La0.8Ce0.2MnO3/ZSM-5的催化活性明显提高,甲苯起燃温度下降了90℃,完全转化温度可低至230℃。