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Mesoporogen-free synthesis of hierarchical sodalite as a solid base catalyst from sub-molten salt-activated aluminosilicate

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Particuology 2020年第1期18卷 48-54页

作者： Jinbiao Yang Tiesen Li Xiaojun Bao Yuanyuan Yue Haiyan Liu State Key Laboratory of Heavy Oil Processing China University of Petroleum18 Fuxue RoadBeijing 102249China East-China Design Branch China Petroleum Engineering&Construction Corporation2 Huayan RoadQingdao 266071China National Engineering Research Center of Chemical Fertilizer College of Chemical EngineeringFuzhou University2 Xueyuan RoadFuzhou 350116China

A rapid and environmentally friendly approach to synthesize hierarchical sodalite from natural aluminosilicate mineral without the involvement of any mesoporogen or post-synthesis treatment was *** strategy involves three important steps:the first is the depolymerization of an aluminosilicate mineral into highly reactive silicon and aluminum species with ideal meso-scale structures through activation of a sub-molten *** second step is the hydrolysis and condensation of the activated aluminosilicate mineral into zeolitic precursors that also have a meso-scale *** third is the rapid zeolitization of the zeolitic precursors through the reversed crystal growth route at room temperature and ambient pressure to form hierarchical *** physicochemical properties of the as-synthesized sodalite were systematically characterized,and the formation mechanism of the hierarchical pore structure was *** used as a solid base catalyst for Knoevenagel condensation,the as-synthesized sodalite and its potassium ion-exchanged product with hierarchical micro-meso-macroporous structure both exhibited high catalytic activity and product selectivity.

关键词： Natural aluminosilicate mineral Hierarchical sodalite Reversed crystal growth route Kirkendall effect solid base catalyst Knoevenagel condensation

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Development of solid base catalyst X/Y/MgO/-Al_(2)O_(3) for optimization of preparation of biodiesel from Jatropha curcas *** oil

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Frontiers of Chemical Science and Engineering 2008年第4期2卷 468-472页

作者： Rui WANG Song YANG Shitao YIN Baoan SONG Pinaki SBHADURY Wei XUE Shuwei TAO Zhaohui JIA Da LIU Liang GAO Center for Research and Development of Fine Chemicals Key Laboratory of Green Pesticide and Agricultural BioengineeringMinistry of EducationGuizhou UniversityGuiyang 550025China Department of Biology and Environment Engineering Guiyang CollegeGuiyang 550005China

The preparation and regeneration conditions of the identified catalyst X/Y/MgO/?-Al2O3 with high catalytic activity were studied and optimized. The biodiesel was prepared by transesterification of Jatropha curcas seed oil produced in Guizhou with methanol at its reflux temoerature in the presence of X/Y/MgO/?-Al2O3 . The pilot plant tests were carried out in a 100 L reaction vessel. Both average yield and fatty acid methyl esters (FAME) content reached more than 96.50% under the optimum reaction conditions of the pilot plant tests designed with an oil/methanol molar ratio of 1 : 10, catalyst concentration of 1.00%, and reaction time of 3 h at reflux temperature. In addition, analysis shows that the quality of biodiesel meets the standard EN 14214.

关键词： solid base catalyst Jatropha curcas oil Transesterification reaction Pilot plant test

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Activity and basic properties of KOH/mordenite for transesterification of palm oil

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Journal of Energy Chemistry 2013年第5期22卷 690-700页

作者： Pisitpong Intarapong Sotsanan Iangthanarat Pitchaya Phanthong Apanee Luengnaruemitchai Samai Jai-In The Petroleum and Petrochemical College Chulalongkorn University Center of Excellence on Petrochemical and Materials Technology Chulalongkorn University The Royal Thai Navy

The catalytic performance of KOH/mordenite has been studied for transesterification of palm oil using a batch reactor and a packed-bed reactor at 60 C and atmospheric *** KOH/mordenite processed transesterification in the batch reactor gave the highest methyl ester yield of96.7%under optimum conditions,while a methyl ester content over 94.5%was obtained in the packed-bed *** comparison indicates that transesterification in a batch-type reactor gives a higher methyl ester yield than that of a continuous-flow *** was found in the calcined catalysts and had a significant effect on the physical structure and chemical composition of the *** of the potassium species was negligible,whereas depositing and washing of the reacted mixture with acetone on the catalyst surface were observed by FTIR.

关键词： transesterification biodiesel mordenite KOH solid base catalyst

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One-Pot Room-Temperature Synthesis of Mg Containing MCM-41 Mesoporous Silica for Aldol Reactions

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Journal of Materials Science & Technology 2018年第12期34卷 2521-2528页

作者： Shin-Ichiro Fujita Shinji Segawa Kazuki Kawashima Xuejing Nie Tomoki Erata Masahiko Arai Division of Applied Chemistry Faculty of EngineeringHokkaido University

One-pot synthesis of Mg containing MCM-41(Mg-MCM-41) materials was respectively carried out by a room temperature(RT) method and a hydrothermal(HT) method for aldol condensation of 4-nitrobenzaldehyde and acetone and self-condensation of acetone. The RT method can prepare MCM-41 materials containing large amounts of Mg while maintaining the structural characteristics of MCM-41 even at very low Si/Mg ratios(large Mg loadings), but the HT method cannot. The RT method can also give more active catalysts than the HT method, because the catalysts prepared by the RT method are more basic than those prepared by the HT one. The characterization indicates that Mg atoms in the Mg-MCM-41 prepared by the RT method exist as MgO disperses well on the wall surface of pores, while those in Mg-MCM-41 prepared by the HT method are included in the bulk with a smectite-like structure.

关键词： Aldol condensation solid base catalyst Mg incorporated mesoporous silica Magic angle spinning nuclear magnetic resonance

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Insight into the function of base-promoted Cu-containing catalysts for highly efficient hydrogenolysis of cellulose into polyols

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Journal of Energy Chemistry 2016年第5期25卷 782-792页

作者： Pengfei Ma Zihui Xiao Shaohua Jin Chuang Li Changhai Liang Laboratory of Advanced Materials and Catalytic Engineering School of Petroleum and Chemical Engineering Dalian University of Technology

The Cu-containing catalysts were synthesized via thermal treatment of the Cu Mg Al hydrotalcite with a fixed metal ratio at various calcination temperatures. The bi-functional solid base catalysts exhibited high activity for the hydrogenolysis of highly concentrated cellulose. The hydrotalcite precursors and the calcined samples were characterized by means of X-ray diffraction（XRD）, thermogravimetric analysis（TG）,N2adsorption–desorption, temperature-programmed reduction of H2（H2-TPR）, temperature-programmed desorption of CO2（CO2-TPD） and dissociative N2O adsorption. The characterization results indicated that the transformation of structure was caused by the increasing calcination temperature, which could further influence the numbers of the base sites and metal active sites in the CuMgAl catalysts. The hydrogenolysis of cellulose was systematically investigated over different catalytic systems. With the CuMgAl-600 catalyst, complete conversion of cellulose can be accomplished and the highest yield obtained is 81.4%,with total polyols yields obtained are 59.1% for the C2–C3 polyols. In addition, either the in-situ hydroxyl or the hydrated OH-due to the "memory effect" of hydrotalcite as Br?nsted bases, was proved to exhibit promotional effect on the hydrogenolysis of cellulose, which could effectively substitute the effect of ionizing alkali. Furthermore, it is noteworthy that the conversion of cellulose could maintain up to 90.2%with unobvious formation of coke-like precipitates when the cellulose concentration reached a high level of 18%.

关键词： CuMgAl hydrotalcites solid base catalyst Hydrogenolysis Highly concentrated cellulose

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