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Catalytic Performance of Modified HMCM-22 Catalysts in Xylene Isomerization

Chinese Journal of Chemistry 2016年第12期34卷 1291-1296页

作者： Xiang Wu Chao Hu Guoqing Zhao Ying Yuan Zhirong Zhu Shanghai Key Lab of Chemical Assessment and Substainability School of Chemical Science and Engineering Tongji University Shanghai 200092 China

HMCM-22 catalysts modified with La203 （5% La） and MgO （≈0.87% Mg） were prepared respectively by impregnation method, and were characterized by scanning electron microscopy, X-ray diffraction, N2 physical ad- sorption-desorption and temperature-programmed desorption of NH3. The effect of supported metallic oxides （La203, MgO） on catalytic performance in xylene isomerization of C8 aromatics （ethylbenzene, m-xylene and o-xylene） was investigated in detail. The experimental results showed that 5% LaJHMCM-22 catalyst had higher isomerization activity and stronger shape-selectivity than 0.87% Mg/HMCM-22 catalyst, owing to its more acid sites and smaller pore size. And the loading amount of La was optimized to be about 7%. Moreover, supporting metal over 7% La/HMCM-22, respectively with 0.3% Pt, 3% Ni and 3% Mo, was carried out to prepare bifunction- al isomerization catalysts. In comparison, 3% Mo/7% La/HMCM-22 showed the best catalytic performance with both high activity and high selectivity, with the low hydrocracking of m-xylene and o-xylene. Besides, the op- timal reaction conditions were found： 340℃, 1.5 MPa H2, WHSV 4 h^-1 and H2/C8 4 mol/mol. Under the above conditions, ethylbenzene conversion was up to 20%, para-selectivity was over 23% with low xylene loss of 2.9%.

关键词： xylene isomerization HMCM-22 catalyst metallic oxide modification bifunctional catalyst

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Restraining NO_x Formation during Coal Combustion in Packed Bed

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International Journal of Minerals,Metallurgy and Materials 1998年第2期12卷 70-74页

作者： Shengli Wu Chunbao Xu Qiushuang Shou Daqiang Cang Metallurgy School, UST Beijing, Beijing 100083, China Metallurgy School UST Beijing Beijing 100083 China

The effects of various combustion conditions (i. e. particle size of coals, oxygen concentration in combustion gas and coal content in the fuel bed, etc.), on reducing conversion of NO_x during coal combustion were studied. Under the present combustion conditions, coals with smaller particle size gave the lower conversion of NO_x, and as expected that an decrease in overall stoichiometric ratio, whether by an decrease in O_2 content in combustion gas or by an increase in coal content in fuel bed would lead to a lower conversion of NO_x. In order to investigate the effect of metallic oxide layers on restraining NO_x formation, the combustion experiments for coal granules with adhering layer of various metallic oxides including Fe_2O_3, Ni_2O_3 and mixed oxides Fe-Ni-O_x were conducted in a packed bed combustor. The combustion experiments have shown that most of adhering materials gave considerable effect on reduction of NO_x emission during coal combustion.

关键词： coal combustion NO_x formation restraining metallic oxide

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Surface oxidized iron-nickel nanorods anchoring on graphene architectures for oxygen evolution reaction

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Chinese Chemical Letters 2021年第11期32卷 3579-3583页

作者： Xu Yu Zhixin Zhao Chengang Pei School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225000China

Surface oxidized iron-nickel nanorods coupling with reduced graphene architectures(FeNi-O-rGA)are successfully constructed via hydrothermal,freeze-drying,and thermal activation *** hierarchical structure can provide lots of pathways for fast ion diffusion and charge transfer,and expose abundant catalytic ***,the activity of FeNi-O-rGA is boosted by the optimized metal-oxygen bond strength in FeNi_(3)*** oxidized FeNi nanorods are strongly coupled with rGA by the formation of metal-O-C bonds,which can impede the aggregation of FeNi_(3)alloys and increase the utilization of active *** special structure and partially oxidized FeNi nanorods for FeNi-O-rGA can result in excellent OER activity and catalytic *** 215 mV of overpotential is required to drive the current density of 10 mA/cm^(2)as well as the Tafel slope of 50.9 mV/dec in 1 mol/L *** change of surface chemistry of FeNi-O-rGA is confirmed by XPS after the OER test,which indicates the highly catalytic stability of FeNi-O-rGA due to the formation of intermediate metal oxyhydroxide.

关键词： Architectures Graphene oxides FeNi nanorods metallic oxide Oxygen evolution reaction

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