孟明
1. 环境催化-气态环境污染物的催化消除;2. 能源催化-清洁能源(氢能等)的催化过程工程;3. 生物无机催化与多孔催化材料的合成与表征。
个性化签名
- 姓名:孟明
- 目前身份:
- 担任导师情况:
- 学位:
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学术头衔:
博士生导师, 教育部“新世纪优秀人才支持计划”入选者
- 职称:-
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学科领域:
催化化学
- 研究兴趣:1. 环境催化-气态环境污染物的催化消除;2. 能源催化-清洁能源(氢能等)的催化过程工程;3. 生物无机催化与多孔催化材料的合成与表征。
孟明,男,出生于1967.9,教授(博导)。
教育背景:中国科学技术大学博士毕业,后分别于德国和法国做博士后研究员。
工作背景:2003年1月起任天津大学工业催化国家重点学科教授,博士生导师,“教育部优秀青年教师”和“教育部新世纪优秀人才计划”入选者。
主要研究方向:1. 环境催化-气态环境污染物的催化消除;2. 能源催化-清洁能源(氢能等)的催化过程工程;3. 生物无机催化与多孔催化材料的合成与表征。
科研成果:主持和完成省部级和国家级科研项目10余项,在国际和国内核心学术期刊上发表论文80多篇,在国内外重要学术会议上发表论文30多篇,被SCI和EI收录论文50多篇,相关成果被SCI期刊论文引用200多次,其中被影响因子3.0以上的国际核心期刊论文引用70多次。曾有三篇学术论文被评为省部级优秀学术论文,其中,发表于美国Catalysis Letters, vol.48, 213-222的论文获第三届安徽省自然科学优秀学术论文一等奖。曾开发系列含微量贵金属的实用型、低成本、具有高活性和热稳定性的系列三效汽车排气净化催化剂(KHW型,KCD型,以及RP-X系列等),申请专利多项。
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孟明, Jin-Yong Luo a, Ming Meng a, ∗, Xiang Li a, Xin-Gang Li a, Yu-Qing Zha a, Tian-Dou Hu b, Ya-Ning Xie b, Jing Zhang b
Journal of Catalysis 254 (2008) 310-324,-0001,():
-1年11月30日
Several nanosized catalysts Co3O4-CeO2 with varying compositions were synthesized by a surfactant-template method and further promoted by a small amount of Pd (0.5 wt%). These catalysts exhibit uniform mesoporous structure and high surface area (>100m2g-1). The Co3O4 crystallites in these catalysts are encapsulated by nanosized CeO2 with only a small fraction of Co ions exposing on the surface and strongly interacting with CeO2. Such structure maximizes the interaction between Co3O4 and CeO2 in three dimensions, resulting in unique redox properties. The introduction of Pd prominently enhances both the reduction and oxidation performance of the catalysts, due to hydrogen or oxygen spillover. These catalysts prepared by surfactant-template method exhibit excellent oxidation performance, especially the ones promoted with Pd, which show markedly enhanced CO oxidation activity even at room temperature. Based upon the results of structural properties, redox behaviors and in situ DRIFTS study, two different reaction pathways over Co3O4-CeO2 and Pd/Co3O4-CeO2 are proposed.
Cobalt oxide, Ceria, Palladium, Mesoporous catalyst, CO oxidation, Structural characterization, Synergy, Mechanism
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孟明, Jin-Yong Luo a, Ming Meng a, *, Yu-Qing Zha a, Ya-Ning Xie b, Tian-Dou Hu b, Jing Zhang b, Tao Liu b
Applied Catalysis B: Environmental 78 (2008) 38-52,-0001,():
-1年11月30日
The influence of the introduction of Pt and/or Fe on the structures, NOx storage property and sulfur removal performance of Ba/Al2O3 catalyst was studied. The techniques of TG/DTA, XRD, FT-IR, H2-TPR, EXAFS and DRIFTS were employed for the careful characterization of the catalysts. Two types of Ba species are identified, namely a well-spread monolayer of Ba species and a bulk BaAl2O4 phase. The addition of Fe inhibits the Ba dispersion by enhancing the bulk BaAl2O4 formation, thus slightly decreasing the SOx absorption and greatly suppressing the growth of the bulk BaSO4, and its addition also promotes the NOx storage by increasing the mobility of the stored NOx, contributing to the formation of bulk Ba (NO3)2. The introduction of Pt always re-disperses the bulk BaAl2O4 phase via a hydration process, and enhances both the NOx and SOx absorption capacity of the catalyst. Whereas the co-existence of Pt and Fe was detrimental for the NOx storage and sulfur removal as compared with Pt/Ba/Al2O3 catalyst, although it favors the reduction of BaSO4 phase. Based upon the EXAFS, in situ DRIFTS and repeated H2-TPR results, it is found that the interaction between Pt and Ba species is of great importance for NOx storage and sulfur removal. This Pt-Ba interaction not only accelerates the NOx spillover which is a key step during storage, but also facilitates the selective reduction of BaSO4 into H2S, favorable to sulfur removal and catalyst regeneration. The introduction of Fe to the Pt/Ba/Al2O3 catalyst decreases this Pt-Ba interaction by encapsulation of Pt in the matrix of Fe/FeOx lattice after repeated redox cycles, leading to the decrease of NOx storage capacity (NSC) of the catalyst, and making sulfur removal more difficult since Fe selectively catalyzes the reduction of BaSO4 into BaS.
Pt, Fe, NOx storage, Sulfur removal, Pt-Ba interaction
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孟明, Jin-Yong Luo, Ming Meng*, Jin-Song Yao, Xin-Gang Li, Yu-Qing Zha, Xitao Wang, Tian-Yong Zhang
Applied Catalysis B: Environmental 87 (2009) 92-103,-0001,():
-1年11月30日
A series of nanostructured Pd-doped mixed oxides MOx-CeO2 (M = Mn, Fe, Co, Ni, Cu), with uniform mesoporous structure and large surface area exceeding 115m2g-1, were synthesized in one step by a surfactant-assisted co-precipitation. Their catalytic performance was investigated using total oxidation of CO and C3H8 as the model reactions. The results show that, a synergism exists between even trace amounts of exposed Pd and 3d-transition metal oxides for CO oxidation, whereas such an effect is absent for C3H8 oxidation. In situ diffuse reflectance infrared spectroscopy (DRIFTS) study reveals that the synergistic essential for CO oxidation should be the interaction-assisted generation of active oxygen species between Pd and MOx, which react readily with CO, forming bidentate carbonate (1587 and 1285cm-1) as intermediates. Moreover, structural characterization results indicate that a solid solution is formed between CeO2 and Mn2O3 or Fe2O3, resulting in the very strong interaction between Pd and MOx, as well as the greatly improved CO oxidation. The light-off temperatures for Pd-doped Mn and Fecontaining catalysts, as compared with the Pd-free catalysts, are decreased by more than 70 and 100℃, respectively. In particular, a CO conversion as high as 80% can be achieved even at room temperature on Pd-doped Mn-containing catalyst. While for C3H8 oxidation, the C-H bond activation, but not the oxygen activation, plays a crucial role. The C-H bond activation ability of the catalysts is largely determined by the d-electron configurations of the M cations. A 'double-peak' phenomenon can be derived with the increase of d-electron number.
Palladium, Ceria, CO oxidation, Propane oxidation, Synergism, Mechanism
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【期刊论文】In situ DRIFTS investigation on the NOx storage mechanisms over Pt/K/TiO2-ZrO2 catalyst
孟明, Yong Liu, Ming Meng*, Zhi-qiang Zou, Xin-gang Li, Yu-qing Zha
Catalysis Communications 10 (2008) 173-177,-0001,():
-1年11月30日
The NSR catalyst Pt/K/TiO2-ZrO2 was prepared by successive impregnation. In situ DRIFTS technique was employed to investigate the NOx storage mechanisms. The results show that no adsorbed NOx species were detected over TiO2-ZrO2, while nitrite and nitrate species could be identified simultaneously over K/TiO2-ZrO2. After Pt deposition, only nitrates species, such as free nitrate ions and monodentate or bidentate nitrates, were observed. The main NOx storage route is via the potassium sites (Ⅰ) adjacent to Pt, the potassium sites (Ⅱ) away from Pt trap NOx only after the saturation of potassium sites (Ⅰ).
NOx storage, Mechanism, TiO2-ZrO2, Potassium
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孟明, Jin-Yong Luo, Ming Meng*, Xin-Gang Li, Yu-Qing Zha
Microporous and Mesoporous Materials 113 (2008) 277-285,-0001,():
-1年11月30日
A mesoporous NSR catalyst Pt/BaCO3-Al2O3 was synthesized by using tri-block copolymer P123 as template. Systematic comparative studies on the structural and catalytic performance between the mesoporous catalyst and the conventional impregnated one were performed. N2 physisorption, XRD, TPD were employed for their structural characterization. In situ DRIFTS, TPR, TEM were used for investigation of the catalytic behaviors for NOx and SOx sorption, as well as desulfation. The results of structural characterization show that mesoporous Pt/BaCO3-Al2O3 exhibits high surface area (261m2g11 after calcination at 600℃), uniform pore size with a diameter of ca. 5 nm and high thermal stability up to 800℃. The Ba-containing species are highly dispersed in three-dimensions and strongly interacted with Al2O3, and all the BaCO3 presents as LT-BaCO3 (BaCO3 with low thermal stability). By contrast, most of the Ba species in the impregnated sample exist predominantly as HT-BaCO3 (BaCO3 with high thermal stability) and are enriched on the surface. As a result, the mesoporous sample possesses great advantages in serving as NSR catalysts, such as enhanced NOx trapping ability, lower sulfation degree, and higher desulfation extent, as compared with the impregnated one. In addition, after NOx and SOx sorption, no bulk phases of barium nitrates and sulfates were observed in the mesoporous catalyst, while they are evidently formed on the impregnated one. In a word, the mesoporous structure is of great significance in achieving high dispersion of barium species and better performance for NOx storage and regeneration of the catalyst.
Mesoporous structure, Pt/, BaCO3-Al2O3, Dispersion, NOx trap, Desulfation
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孟明, Yong Liu, Ming Meng∗, Xin-Gang Li, Li-Hong Guo, Yu-Qing Zha
CHEMICAL ENGINEERING RESEARCH AND DESIGN 86 (2008) 932-940,-0001,():
-1年11月30日
The NOx storage and reduction (NSR) catalysts Pt/K/TiO2-ZrO2 were prepared by an impregnation method. The techniques of XRD, NH3-TPD, CO2-TPD, H2-TPR and in situ DRIFTS were employed to investigate their NOx storage behavior and sulfur-resisting performance. It is revealed that the storage capacity and sulfur-resisting ability of these catalysts depend strongly on the calcination temperature of the support. The catalyst with theist support calcined at 500℃, exhibits the largest specific surface area but the lowest storage capacity. With increasing calcination temperature, the NOx storage capacity of the catalyst improves greatly, but the sulfur-resisting ability of the catalyst decreases. In situ DRIFTS results show that free nitrate species and bulk sulfates are the main storage and sulfation species, respectively, for all the catalysts studied. The CO2-TPD results indicate that the decomposition performance of K2CO3 is largely determined by the surface property of the TiO2-ZrO2 support. The interaction between the surface hydroxyl of the support and K2CO3 promotes the decomposition of K2CO3 to form -OK groups bound to the support, leading to lowNOx storage capacity but high sulfur-resisting ability, while the interaction between the highly dispersed K2CO3 species and Lewis acid sites gives rise to high NOx storage capacity but decreased sulfur-resisting ability. The optimal calcination temperature of TiO2-ZrO2 support is 650℃.
NOx storage, Sulfur-resistance, ZrO2-TiO2, Potassium carbonate, Regeneration
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孟明, Zhi-Qiang Zou, Ming Meng∗, Qian Li, Yu-Qing Zha
Materials Chemistry and Physics 109 (2008) 373-380,-0001,():
-1年11月30日
The multicomponent mesoporous materials Co-Ce-Zr-O with different atomic ratios of Co/Ce were prepared by using the mixed surfactants consisting of nonionic p-octyl polyethylene glycol phenyl ether (OP) and cationic cetyltrimethyl-ammonium bromide (CTAB) as co-templates. The results of N2 adsorption/desorption show that these materials possess not only large specific surface areas above 100m2 g−1 but also uniform mesoporous pore diameter centered at 4.6nm. The structural characterization results of XRD and XPS indicate that the highly dispersed Co3O4 crystallites should be the main active phase for CO oxidation. The change of Co/Ce atomic ratio shows little influence on the specific surface areas of the samples whereas it apparently affects the interaction between cobalt and cerium phase. When Co/Ce ratio is 1:1, the catalyst shows the best performance for CO oxidation due to its highest oxygen mobility and surface enrichment of cerium species, as confirmed by H2-TPR and XPS, respectively. When ultra-low amount of Pd (0.044wt%) is added to Co-Ce-Zr-O, the temperature for the full conversion of CO is only 97℃, about 43℃ lower than that without Pd. This great activity enhancement of Pd can be ascribed to oxygen spillover during oxidation reaction, which has been clearly evidenced by O2-TPO results.
Chemical synthesis, Oxides, Inorganic compounds, Oxidation
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孟明, Qian Li, Ming Meng∗, Zhi-Qiang Zou, Xin-Gang Li, Yu-Qing Zha
Journal of Hazardous Materials 161 (2009) 366-372,-0001,():
-1年11月30日
A series of potassium-promoted hydrotalcite-based CoMgAlO mixed oxide catalysts used for simultaneous soot combustion and nitrogen oxides storagewere prepared by impregnation method. The techniques of TG/DTA, XRD, H2-TPR and in situ DRIFTS were employed for catalyst characterization. Over the catalyst containing 7.5% or 10% K, the soot ignition temperature (Ti=260℃) and total removal temperature (Tf=390℃) are decreased by 180℃ and 273℃, respectively, as compared with the uncatalyzed reaction. The results of kinetic calculation show that the presence of K-promoted catalysts decreases the activation energy of soot combustion from 207 kJ/mol to about 160 kJ/mol. When 400ppm NO is introduced, lower characteristic temperatures or higher reaction rate for soot oxidation is achieved. Simultaneously, relatively larger nitrogen oxides storage capacity is obtained. It is revealed by H2-TPR that the addition of K increases the amount of active Co sites and the mobility of bulk lattice oxygen due to the low melting point of K-containing compounds, the lowvalence of K+ and the strong interaction between K and Mg (Al). For nitrogen oxides storage, different routes via chelating bidentate nitrates, monodentate nitrates and ionic nitrates are confirmed by in situ DRIFTS over the CoMgAlO catalysts with potassium loadings of 0, 1.5 and 7.5%, respectively.
Hydrotalcite, Soot combustion, Nitrogen oxides storage, Nitrate, Mechanism
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孟明, Zhi-Qiang Zou, Ming Meng∗, Yu-Qing Zha
Journal of Alloys and Compounds 470 (2009) 96-106,-0001,():
-1年11月30日
A series of Co-Ce-O mesoporous catalysts doped with Cu, Fe, Ni or La and the undoped one were synthesized by using tri-block copolymer P-123 as the template. These catalysts showwormhole-like structures, high surface areas (144-167m2/g) and uniform meso-pore size distributions (4.0-4.8 nm) after calcination at 500℃. The activity for low-temperature CO oxidation and the thermal stability of the mesoporous Co-Ce-O catalyst are largely modified by the dopant Cu, Fe, Ni or La in different ways. It is revealed by in situ diffuse reflectance infrared spectroscopy that CO oxidation over all the samples except the Nidoped one undergoes carbonates pathway. In this case, the oxidation activities of the catalysts are mainly determined by the mobility of surface lattice oxygen species, which is indicated by the temperatureprogrammed reduction and desorption results. Doping with Cu greatly enhances the oxidation activity of Co-Ce-O catalyst at the calcination temperatures of 500 ◦C and 650 ◦C, and doping with La significantly improves its activity at the calcination temperature of 800 ◦C. However, doping with Fe always decreases the activity of Co-Ce-O catalyst regardless of the calcination temperature. Largely different from other dopants, the addition of Ni induces a change of themechanism for COoxidation and results in a remarkable decrease in the activity.
Composite materials, Oxide materials, Precipitation, Catalysis, X-ray diffraction
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【期刊论文】Microsolvation of glycine by silanol ligands: A DFT study
孟明, Dominique Costa*, Claire Lomenech, Ming Meng, Lorenzo Stievano, Jean-Franc¸ois Lambert
Journal of Molecular Structure: THEOCHEM 806 (2007) 253-259,-0001,():
-1年11月30日
The interaction of glycine with SiOH silanols, which cover the surface of amorphous silica are modeled and investigated by means of the DFT B3LYP/6-31++G** method. The neutral and zwitterion form of glycine are considered. Cooperative hydrogen bonding, with one or several silanol groups, are studied. Different scenarii are modeled: adsorption from the gas phase at 0 and 430K and adsorption of the microsolvated glycine. It is shown that hydroxylated silica does not act to stabilize the zwitterion form of glycine and thus cannot be considered as a "solid solvent": glycine remains more stable in the neutral state when bonded up to 3 silanols. In contrast, if water molecules are adsorbed on the silanols, they act as co-stabilizors of the zwitterionic state. Two distinct domains exist in the (T, P) phase diagram: in the first one, glycine is stabilized on silanols and in the second, glycine is more stable in the gas phase. Vibration frequencies are calculated and compared with experimental ones.
Glycine, Silica, Adsorption, Frequencies, DFT
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