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Chinese Journal of Chemical Engineering 2016年第6期24卷 818-823页

作者： Xianliang Meng Mingqiang Gao ruizhi chu Guoguang Wu Qiang Fang School of Chemical Engineering and Technology China University of Mining & Technology Key Laboratory of Gas and Fire Control for Coal Mines China University of Mining & Technology

This work aimed at studying the feasibility of calculating the coal-oxygen diffusion properties during the low temperature oxidation process of lignite so as to predict its spontaneous combustion process. Coal samples were oxidized in air ambient under different temperatures. Scanning Electron Microscope was used to indicate the surface morphology changes of oxidization. Then, based on fractal theory and flow characteristics, the ffactal dimension of gas diffusion in the pore ways was calculated under different temperature. Considering pore size distribution, connectivity distribution and Fick diffusion mechanisms, the relationship between the gas diffusivity change with pore area ffactal dimension and porosity was investigated, and multiple linear equation of the coal- oxygen diffusion coefficients and pore parameters was obtained. Comparison between the experimental data and model prediction verifies the validiW of the model. The research provides a theoretical basis for the prediction model of coal-oxygen diffusion law.

关键词： Coal spontaneous combustionOxidationPore structureDiffusion

Catalytic kinetics of dimethyl ether one-step synthesis over CeO_2–CaO–Pd/HZSM-5 catalyst in sulfur-containing syngas process

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Chinese Journal of Chemical Engineering 2016年第12期24卷 1735-1741页

作者： ruizhi chu Wenxin Hou Xianliang Meng Tingting Xu Zhenyong Miao Guoguang Wu Lei Bai School of Chemical Engineering and Technology China University of Mining & Technology Xuzhou 221116 China High-Tech Research Institute of China University of Mining and Technology Lianyungang 222000 China Department of Chemical and Biomedical Engineering West Virginia University Morgantown 26506 USA

CeO_2–CaO–Pd/HZSM-5 catalyst was prepared for the dimethyl ether(DME) one-step synthesis in a continuous fixed-bed micro-reactor from the sulfur-containing syngas. The catalytic stability over hybrid catalyst of CeO_2–CaO–Pd/HZSM-5 was investigated to ensure that the kinetics experimental results were not significantly influenced by induction period and catalytic deactivation. A large number of kinetic data points(40 sets) were obtained over a range of temperature(240–300 °C), pressure(3–4 MPa), gas hourly space velocity(GHSV)(2000–3000 L·kg^(-1)·h^(-1)) and H_2/CO mole ratio(2–3). Kinetic model for the methanol synthesis reaction and the dehydration of methanol were obtained separately according to reaction mechanism and Langmuir–Hinshelwood mechanism. Regression parameters were investigated by the method combining the simplex method and Runge–Kutta method. The model calculations were in appropriate accordance with the experimental data.

关键词： CeO_2–CaO –Pd/HZSM-5 catalyst DME One-step synthesis Catalytic kinetics Sulfur-containing syngas

A study on the catalytic performance of Pd/γ-Al_(2)O_(3),prepared by microwave calcination,in the direct synthesis of dimethylether

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Frontiers of Chemical Science and Engineering 2010年第4期4卷 452-456页

作者： ruizhi chu Xianyong WEI Zhimin ZONG Wenjia ZHAO Key Laboratory of Coal Processing and Efficient Utilization(Ministry of Education) China University of Mining&TechnologyXuzhou 221008China Hubei Coal Conversion and New Carbon Materials Key Laboratory Wuhan University of Science and TechnologyWuhan 430081China

A series of Pd/γ-Al_(2)O_(3) hybrid catalysts were prepared by impregnation and subsequent calcination under microwave *** catalysts were used for direct synthesis of dimethylether(DME)from *** results show that calcination under microwave irradiation improved both the activity and selectivity of the catalysts for DME *** optimum power of the microwave was determined to be 420 *** such optimum conditions,CO conversion,DME selectivity and time space yield of DME were 60.1%,67.0%,and 21.5 mmol$mL-1$h^(-1),*** on various characterizations such as nitrogen physisorption,X-ray diffraction,COtemperature-programmed desorption,and Fourier transform infrared spectral analysis,the promotional effect of the microwave irradiation on the catalytic property was mainly attributed to both the higher dispersion of Pd and the significant increase in the adsorption on the CO-bridge of *** irradiation with very high power led to the increase in CO-bridge adsorption and thereby decreased the catalytic activity,whereas the coverage by metallic Pd of the active sites on acidicγ-Al_(2)O_(3) significantly occurred under microwave irradiation with very low power,resulting in a decrease in the selectivity to DME.

关键词： Pd/γ-Al_(2)O_(3) direct synthesis dimethyl ether calcination under microwave irradiation

Characteristics of coal sludge slurry prepared by a wet-grinding process

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International Journal of Mining Science and Technology 2016年第5期26卷 947-953页

作者： Ma Shaolian Wu Guoguang Meng Xianliang Zhou Rui chu ruizhi Miao Zhenyong Qi Yueming School of Chemical Engineering and Technology China University of Mining ＆ Technology Xuzhou 221116 China Ministry of Education＇s Key Lab of Coal Processing and High Efficient Clean Utilization Xuzhou 221116 China Advanced Analysis and Computation Center China University of Mining ＆ Technology Xuzhou 221116 China School of Resources and Ceosciences China University of Mining ＆ Technology Xuzhou 221116 China

Coal sludge slurry(CSS) is an alternative fuel and a potential competitive method for sludge *** on the researches of coal water slurry, we studied CSSs by using a wet-grinding process with different types of regional municipal sludge(sludge) in an orthogonal experiment. The sludge type,sludge mixing proportion, dosage of dispersant, and grinding time were tested in this study. The results show that water content and its occurrence characteristics in the sludge have primary hindering influences on slurry ability. The range of fixed-viscosity concentrations with raw wet sludge is from 50.78%to 44.40%(by weight), while the range is from 53.35% to 51.51%(by weight) with dry sludge. All of the CSSs exhibit shear-thinning behaviors with different variation trends, especially the CSSs with more than 15%(by weight) raw wet sludge in it. Adding the same proportion of raw wet sludge increases the thixotropic properties of CSSs and the highest area of thixotropy loop is 3065 Pa/s, while the highest value of dry sludge is 1798 Pa/s. Hydrophilic group plays an important role in adsorbing water and building three-dimension networks with other particles, which is the main reason for CSS ***, the mechanism can be used to find the way for making high quality CSS.

关键词： Coal sludge slurry Municipal sludge Wet-grinding process Fixed-viscosity concentration Hydrophilic groups

Enhancement of catalytic and anti-carbon deposition performance of SAPO-34/ZSM-5/quartz films in MTA reaction by Si/Al ratio regulation

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Chinese Journal of Chemical Engineering 2023年第4期56卷 314-324页

作者： Jiaxin Wu Chenxiao Wang Xianliang Meng Haichen Liu ruizhi chu Guoguang Wu Weisong Li Xiaofeng Jiang Deguang Yang School of Chemical Engineering and Technology China University of Mining&TechnologyXuzhou 221116China Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education Xuzhou 221116China

In order to further improve the catalytic performance of zeolite catalyst for methanol to aromatics(MTA)technology, the double-tier SAPO-34/ZSM-5/quartz composite zeolite films were successfully synthesized via hydrothermal crystallization. The Si/Al ratio of SAPO-34 film was used as the only variable to study this material. The composite zeolite material with 0.6Si/Al ratio of SAPO-34 has the largest mesoporous specific surface area and the most suitable acid distribution. The catalytic performance for the MTA process showed that 0.6-SAPO-34/ZSM-5/quartz film has as high as 50.3% benzene-toluenexylene selectivity and 670 min lifetime. The MTA reaction is carried out through the path we designed to effectively avoid the hydrocarbon pool circulation of ZSM-5 zeolite, so as to improve the aromatics selectivity and inhibit the occurrence of deep side reactions to a great extent. The coke deposition behavior was monitored by thermogravimetric analysis and gas chromatograph/mass spectrometer, it is found that with the increase of Si/Al ratio, the active intermediates changed from low-substituted methylbenzene to high-substituted methylbenzene, which led to the rapid deactivation of the catalyst. This work provides a possibility to employ the synergy effect of composite zeolite film synthesizing anti-carbon deposition catalyst in MTA reaction.

关键词： Composite zeolite film Methanol to aromatics Anti-carbon deposition Si/Al ratio Hydrocarbon pool circulation mechanism

Construction of a macromolecular structural model of Chinese lignite and analysis of its low-temperature oxidation behavior

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Chinese Journal of Chemical Engineering 2017年第9期25卷 1314-1321页

作者： Xianliang Meng Mingqiang Gao ruizhi chu Zhenyong Miao Guoguang Wu Lei Bai Peng Liu Yuanfang Yan Pengcheng Zhang Key Laboratory of Coal-based CO_2 Capture and Geological Storage Jiangsu Province (China University of Mining & Technology) School of Chemical Engineering and Technology China University of Mining & Technology Department of Chemical and Biomedical Engineering West Virginia University

The aim of this paper is to analyze the change in the active structure of lignite during the process of lowtemperature oxidation by constructing a molecular structure model for lignite. Using quantum computation combined with experimental results of proximate analysis, ultimate analysis, Fourier transform infrared spectroscopy(FTIR) and X-ray photoelectron spectroscopy(XPS), a structural model for the large molecular structure was constructed. By analyzing the bond lengths in the model molecule, the evolution law for the active structure of lignite was predicted for the process of low-temperature oxidation. In low-temperature oxidation,alkanes and hydroxyls are the primary active structures observed in lignite, though ether may also react. These active functional groups react with oxygen to release heat, thereby speeding up the reaction between coal and oxygen. Finally, the content of various functional groups in the process of lignite low-temperature oxidation was analyzed by infrared analysis, and the accuracy of the model was verified.

关键词： Chinese lignite Coal combustion Molecular simulation Low-temperature oxidation process Environment

Thermogravimetric study of the effect of a PVA oxygen-insulating barrier on the spontaneous combustion of coal

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Mining Science and Technology 2010年第6期20卷 882-885页

作者： MENG Xianhang chu ruizhi WU Guoguang XU Hongfeng ZHU Jiamei WANG Zhihua School of Chemical Engineering and Technology China University of Mining & Technology Xuzhou 221008 China Key Laboratory of Coal Processing and Efficient Utilization China University of Mining & Technology Ministry of Education Xuzhou 221008 China

Coal samples in the air for three months were characterized by Thermogravimetric Analysis (TGA). The effect of a PVA oxygen-insulating barrier on the spontaneous combustion of coal was examined. The moisture loss activation energy, oxidation activation energy and combustion activation energy were calculated by an integral method using the Coats-Redfen formula. The results show that the tendency for spontaneous combustion of three coal samples (judged by the activation energy) falls in the order: CYW>YJL>SW. The oxidation activation energy and combustion activation energy of coal protected by the PVA oxygen-insulating barrier increased. A significant increase in the combustion activation energy was noted, especially for the CYW coal where the in-crease was 28.53 kJ/mol. Hence, oxidation of the protected coal samples was more difficult. The PVA oxygen-insulating barrier helps to prevent spontaneous combustion of the coal.

关键词： coal spontaneous combustion oxygen-insulating barrier activation energy thermogravimetric analysis

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头孢拉定结晶工艺

化工进展 2006年第10期25卷 1211-1213页

作者：褚睿智孟献梁张宝中国矿业大学化工学院江苏徐州221008

考察了不同结晶体系对头孢拉定结晶过程的影响,通过正交试验优化了头孢拉定结晶工艺条件,即水量为头孢拉定质量的2倍,三乙胺和N,N-二甲基甲酰胺体积比为1.2,结晶初始温度30℃,结晶终了温度5℃。结果证明,在此条件下所得产品结晶收率可达... 详细信息

考察了不同结晶体系对头孢拉定结晶过程的影响,通过正交试验优化了头孢拉定结晶工艺条件,即水量为头孢拉定质量的2倍,三乙胺和N,N-二甲基甲酰胺体积比为1.2,结晶初始温度30℃,结晶终了温度5℃。结果证明,在此条件下所得产品结晶收率可达92%左右。利用高效液相色谱、电子显微镜对产品进行检测证明产品纯度可达98%以上,粒度分布均匀,晶面完整;同时通过40℃储存条件下的化学稳定性试验表明产品稳定性符合药品质量要求。

关键词：夹孢拉定结晶体系结晶工艺正交试验高效液相

助剂对Pd/γ-Al_2O_3催化剂一步法合成二甲醚反应稳定性的影响

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化工进展 2016年第8期35卷 2474-2479页

作者：褚睿智徐婷婷孟献梁吴国光侯文心中国矿业大学化工学院江苏徐州221008 中国矿业大学连云港徐圩新区高新技术研究院江苏连云港222000

采用浸渍法制备了一系列不同助剂下的负载型Pd/γ-Al_2O_3催化剂,考察了助剂类型对Pd/γ-Al_2O_3催化剂一步法合成二甲醚(STD)反应稳定性的影响规律;采用氮吸附、XRD、H_2-TPR及TG等多种表征手段考察了稳定性试验前后以及烧炭再生后催... 详细信息

采用浸渍法制备了一系列不同助剂下的负载型Pd/γ-Al_2O_3催化剂,考察了助剂类型对Pd/γ-Al_2O_3催化剂一步法合成二甲醚(STD)反应稳定性的影响规律;采用氮吸附、XRD、H_2-TPR及TG等多种表征手段考察了稳定性试验前后以及烧炭再生后催化剂的表面物化性质及结构变化。结果表明,助剂成分对Pd/γ-Al_2O_3催化剂的STD反应稳定性影响显著。相比Pd/γ-Al_2O_3催化剂,添加Ce O_2可以提高Pd在γ-Al_2O_3表面的分散度,但会覆盖表面的部分酸性位,一定程度上提高了催化剂的活性和稳定性,但仍存在Pd烧结和积炭现象;添加复合助剂Ce O_2-Zr O_2后形成的Ce-O-Zr固熔晶面能显著促进Pd均匀分散,提高催化剂的抗积炭能力和抗烧结能力,催化剂的活性和稳定性更高;经SO_4^(2–)改性后Pd/γ-Al_2O_3催化剂会因为表面积炭加剧和表面硫流失严重,中强酸酸性位减少而快速失活。Ce O_2-Zr O_2-Pd/γ-Al_2O_3催化剂经历20h的稳定性试验后CO转化率仍保持59%以上,二甲醚选择性65%以上,烧炭再生后催化活性恢复至新鲜催化剂的91.83%。

关键词： Pd/γ-Al2O3催化剂助剂制备稳定性失活一步法合成二甲醚合成气

咪唑取代环三磷嗪衍生物的制备及其摩擦学性能

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润滑与密封 2008年第5期33卷 5-9页

作者：朱佳媚刘维民褚睿智孟献梁中国矿业大学化工学院江苏徐州221008 中国科学院兰州化学物理研究所固体润滑国家重点实验室甘肃兰州730000

合成了3种咪唑取代环三磷嗪化合物,通过核磁共振磷谱(31P-NMR)、元素分析和傅立叶转换红外光谱对其结构进行了表征。用Optimal SRV型摩擦磨损试验机考察了其作为钢/钢摩擦副润滑油的摩擦学性能。对钢球的磨损表面进行扫描电子显微镜和X... 详细信息

合成了3种咪唑取代环三磷嗪化合物,通过核磁共振磷谱(31P-NMR)、元素分析和傅立叶转换红外光谱对其结构进行了表征。用Optimal SRV型摩擦磨损试验机考察了其作为钢/钢摩擦副润滑油的摩擦学性能。对钢球的磨损表面进行扫描电子显微镜和X射-线光电子能谱仪分析。研究结果表明,合成的3种化合物作为润滑油均具有较好的摩擦学性能;摩擦过程中咪唑取代环三磷嗪在摩擦副表面发生了复杂的摩擦化学反应,形成了含FePO4、有机F和N等物质组成的边界润滑膜,从而起到减摩抗磨作用。

关键词：咪唑取代环三磷嗪润滑油摩擦学性能