CO2重整甲烷制合成气催化剂六铝酸盐LaNiy/Al12-yO19-δ的研究

A series of Ni modified hexaaluminates LaNi y Al 12- y O 19- δ ( y =0 3, 0 6, 0 9, 1 0) were prepared by decomposition of nitrates and calcination at high temperature. The crystalline structure and catalytic properties for CO 2 reforming of methane to synthesis gas were investigated by using XRD, XPS, TPR and TGA techniques. The results showed that a pure hexaaluminate LaNi y Al 12- y O 19- δ phase is formed only when y value is in 0< y ≤1. The reduced hexaaluminates LaNi y Al 12- y O 19- δ exhibit significant catalytic activity and stability for the reaction of CO 2 reforming of methane to synthesis gas at 780 ℃, and no deactivation resulting from carbon deposition is found. In the meantime, the catalytic activity is obviously affected by the modifier Ni in the hexaaluminate lattices. Under the same reaction conditions, the conversion of CH 4 and CO 2 increase with increase in the amount ( y value) of the modifier Ni.     

PREPARATION AND CATALYTIC PROPERTIES OF M-MODIFIED HEXAALUMINATES MNiAl(11)O(19-|?) FOR METHANE REFORMING WITH CO2 TO SYNGAS

A series of M-modified hexaaluminates, MNiAl(11)O(19-|?)(M=Ca, Sr, Ba), were prepared as new catalysts for methane reforming With CO2 to syngas. The structures and catalytic activities of these catalysts were investigated. These catalysts exhibited high catalytic activities and good stability for methane reforming With CO2 to syngas at high temperatures. The conversions of CH4 and CO2 were over 93.4% and 91.2%, respectively. When the reaction was carried out at 780oC for 2 h. no Ni sintering and catalyst deactivation were found.     

Xanthones with antiproliferative effects on prostate cancer cells from the stem bark of Garcinia xanthochymus

Investigations of the constituents of the stem barks of Garcinia xanthochymus have yielded two new compounds, garcinenones X (1) and Y (2), along with five known xanthones, 1,4,5,6-tetrahydroxy-7-(3-methylbut-2-enyl)xanthone (3), 1,4,6-trihydroxy-5-methoxy-7-(3-methylbut-2-enyl)xanthone (4), 1,4,5,6-tetrahydroxy-7,8-di(3-methylbut-2-enyl)xanthone (5), 1,3,5,6-tetrahydroxy-4,7,8-tri(3-methylbut-2-enyl)xanthone (6), and 1,5,6-trihydroxy-7,8-di(3-methylbut-2-enyl)-6',6'dimethylpyrano(2',3':3,4)xanthone (7). The structures of the compounds were determined by spectroscopic methods. The cell growth inhibitory activity of the isolated compounds against the PC-3 cell line was measured. Among them, compounds 2, 3, 5, and 6 exhibited significant inhibitory effects with IG50 values of 14.3, 15.5, 11.1, and 6.8 microM, respectively.     

Asperterzine,a symmetric aromatized derivative of epipolythiodioxopiperazine,from the endophytic fungus Aspergillus terreus PR-P-2

A new symmetric aromatized derivative of epidithiodioxopiperazine, asperterzine (1), was isolated from the endophytic fungus Aspergillus terreus PR-P-2. The structure was elucidated by various spectroscopic and the cytotoxicity against HL-60 cell line was also evaluated.     

Partial Oxidation of Methane to Synthesis Gas over Hexaaluminates LaMAl_(11)O_(19-δ) catalysts

A series of M-substituted hexaaluminates LaMAl11O19-δ(M=Fe, Co, Ni, Mn, and Cu) were prepared and characterized by XRD, XPS, TPR and TGA techniques, respectively. They exhibited different reducibility and catalytic activity for partial oxidation of methane (POM) to synthesis gas. Among the LaMAl11O19-δsamples, LaNiAl11O19-δshowed the best catalytic activity for the topic reaction and selectivity for synthesis gas at 780℃for 2 h. The conversion of CH4 was over 99.2%, and the product selectivity for both CO and H2 was above 90.3%.     

Kinetics of Carbon Deposition on Hexaaluminate LaNiAl11O19 Catalyst During CO2 Reforming of Methane

In this paper, the properties of carbon deposited on hexaaluminate LaNiAl11O19 catalyst were characterized by X-ray photoelectron spectroscopy (XPS), and in the meantime, the amount of carbon deposited on the catalyst, after both CH4 decomposition and CO2 reforming of CH4, was determined by means of thermogravimetric analysis (TGA), respectively. The rates of carbon deposited on the catalyst were also investigated and the apparent kinetic equation of CO2 reforming of CH4: vc = kp0.72(CH4).p-0.55(CO2), was established by analyzing the relation between the rates of deposited carbon and the pressure ratio of CH4 and CO2.     

Studies on Carbon Deposition on Hexaaluminate LaNiAl11O19 Catalysts during CO2 Reforming of Methane

The amount of carbon deposited on hexaaluminate LaNiAl₁₁O₁₉ catalyst in CH₄ decomposition and CO₂ reforming of methane was determined by means of thermogravimetric analysis (TGA). The properties of carbon formed on the catalysts were characterized by X-ray photoelectron spectroscopy (XPS), temperature-programmed CO₂ reaction (TPR-CO₂), and temperature-programmed oxidation (TPO) techniques. The experimental results showed that hexaaluminate LaNiAl₁₁O₁₉ catalyst possessed high resistance to carbon deposition in CO₂ reforming of methane to synthesis gas at high temperatures, and CO₂ played an important role in eliminating carbon during the reaction. At least two forms of the deposited carbon, graphite and carbide, were produced during methane reforming with CO₂.     

A new polyketide,penicillolide from the marine-derived fungus Penicillium sacculum

A new polyketide, penicillolide (1) was isolated from the fermentation broth of the marine-derived fungus Penicillium sacculum GT-308. Compound 1 is a polyketide with a unique carbon skeleton. The structure of this compound was established via extensive spectroscopic analyses including 1D-, 2D-NMR, and HRESI-MS.     

Partial Oxidation of Methane to Synthesis Gas over Hexaaluminates LaMAl11O19-δ Catalysts

A series of M-substituted hexaaluminates LaMAl11O19-δ （M=Fe, Co, Ni, Mn, and Cu） were prepared and characterized by XRD, XPS, TPR and TGA techniques, respectively. They exhibited different reducibility and catalytic activity for partial oxidation of methane （POM） to synthesis gas. Among the LaMAl11019-δ samples, LaNiAl11O19-δ showed the best catalytic activity for the topic reaction and selectivity for synthesis gas at 780 ℃ for 2 h. The conversion of CH4 was over 99.2%, and the product selectivity for both CO and H2 was above 90.3%.     

Ni调变六铝酸盐复合氧化物BaNiyAl12-yO19-δ催化剂上CO_2重整甲烷制合成气(英文)

制备了Ni调变六铝酸盐复合氧化物BaNiyAl12-yO19-δ ,并用XRD、XPS、TPR和TGA等技术对催化剂的结构和性能进行了表征。结果表明,这一系列六铝酸盐复合氧化物BaNiyAl12-yO19-δ 表现出相同的晶体结构和相似的还原稳定性,并且只有y值在0相似文献