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Using ultrasound to improve the sequential post-synthesis modification method for making mesoporous Y zeolites

Frontiers of Chemical Science and Engineering 2020年第2期14卷 275-287页

作者： Rongxin Zhang Peinan Zhong Hamidreza Arandivan Yanan Guan Jinmin Liu Na Wang Yilai Jiao Xiaolei Fan Department of Chemical Engineering and Analytical Science School of EngineeringThe University of ManchesterManchesterM139PLUK Laboratory of Advanced Catalysis for Sustainability School of ChemistryThe University of SydneySydney 2006Australia Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Sino-Spanish Advanced Materials Institute Shenyang University of Chemical TechnologyShenyang 110142China Advanced Manufacturing Institute of Polymer Industry(AMIPI) Shenyang University of Chemical TechnologyShenyang 110142China Key Laboratory of Materials and Advanced Equipment for Resource Chemical Technology(Ministry of Education) Shenyang University of Chemical TechnologyShenyang 110142China

Mesoporous Y zeolites were prepared by the sequential chemical dealumination(using chelating agents such as ethylenediaminetetraacetic acid,H EDTA,and citric acid aqueous solutions)and alkaline desilication(using sodium hydroxide,NaOH,aqueous solutions)treatments.Specifically,the ultrasound-assisted alkaline treatment(i.e.,ultrasonic treatment)was proposed as the alternative to conventional alkaline treatments which are performed under hydrothermal conditions.In comparison with the hydrothermal alkaline treatment,the ultrasonic treatment showed the comparatively enhanced efficiency(with the reduced treatment time,i.e.,5 min vs.30 min,all with 0.2 mol·L NaOH at 65°C)in treating the dealuminated Y zeolites for creating mesoporosity.For example,after the treatment of a dealuminated zeolite Y(using 0.1 mol·L H EDTA at 100°C for 6 h),the ultrasonic treatment produced the mesoporous zeolite Y with the specific external surface area()of 160 m·g and mesopore volume()of 0.22 cm·g,being slightly higher than that by the conventional method(i.e.,=128 m·g and=0.19 cm·g).The acidic property and catalytic activity(in catalytic cracking of-octane)of mesoporous Y zeolites obtained by the two methods were comparable.The ultrasonic desilication treatment was found to be generic,also being effective to treat the dealuminated Y zeolites by citric acid.Additionally,the first step of chemical dealumination treatment was crucial to enable the effective creation of mesopores in the parent Y zeolite(with a silicon-to-aluminium ratio,Si/Al=2.6)regardless of the subsequent alkaline desilication treatment(i.e.,ultrasonic or hydrothermal).Therefore,appropriate selection of the condition of the chemical dealumination treatment based on the property of parent zeolites,such as Si/Al ratio and crystallinity,is important for making mesoporous zeolites effectively.

关键词： zeolite Y mesoporous zeolite post-synthesis treatment ultrasound chemical dealumination treatment alkaline desilication treatment

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Diamine-modified porous indium frameworks with crystalline porous materials(CPM)-5 structure for carbon dioxide fixation under co-catalyst and solvent free conditions

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Journal of Environmental Sciences 2023年第10期132卷 12-21页

作者： Naghmeh Bayati Saeed Dehghanpour Department of Chemistry Faculty of Physics and ChemistryAlzahra UniversityTehran ***Iran

In the presentwork,functional diamine groups into indium frameworks to synthesize cyclic carbonates from CO_(2)and epoxides with efficient catalytic activity in the absence of cocatalyst and solvent are reported for the first time.Crystalline porous materials(CPM)-5 modified with 1,2-phenylene diamine and ethylene diamine(CPM-5-PhDA and CPM-5-EDA),were prepared using a post-synthetic modification(PSM)method.The properties of the modified CPM-5 were characterized by powder X-ray diffraction(PXRD),Fourier transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),N2-adsorption,scanning electron microscopy(SEM),CO_(2)adsorption,and temperature programmed desorption TPD methods.The presence of diamine groups as basic sites and indium Lewis acid sites in the framework structure were desirable for high catalytic activity.For a given catalyst weight,CPM-5-PhDA was the best candidate to appear with great catalytic activity and selectivity for the cycloaddition reaction at 100°C and1MPa CO_(2)under co-catalyst and solvent free conditions.CPM-5-PhDA alsowas found to afford large and bulky epoxides.The catalyst can be easily separated and reused five times without any decline in activity.

关键词： Cyclic carbonate Metal-organic frameworks CO_(2)fixation post-synthesis Co-catalyst free

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Bifunctional metal–organic frameworks toward photocatalytic CO2reduction by post-synthetic ligand exchange

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Rare Metals 2019年第5期38卷 413-419页

作者： Xiao-Hui Chen Qin Wei Jin-Dui Hong Rong Xu Tian-Hua Zhou School of Chemical Engineering Fuzhou UniversityFuzhou 350002China School of Chemical and Biomedical Engineering Nanyang Technological UniversitySingapore 637459Singapore State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Photocatalytic reduction of CO2 to useful fuel has been identified as a promising strategy to address the energy and environmental issues.Development of welldefined photocatalysts toward CO2 reduction has attracted increasing interest to gain insight into the reactive mechanism.Herein,by post-synthetic ligand exchange,a bifunctional Re-based metal–organic framework(MOF)was successfully prepared.It not only serves as a photosensitizer but also acts as a catalyst for photochemical reduction of CO2.Furthermore,it is found that a Re-based MOF containing 30%Re-based ligands displays improved activity compared to MOF with 100%Re-based ligands.This work provides clues to the design and synthesis of bifunctional MOFs toward photocatalytic CO2 reduction.

关键词： Photocatalysis Metal-organic framework(MOF) CO2 reduction post-synthesis

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Engineering porous organic polymers for carbon dioxide capture

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Science China Chemistry 2017年第8期60卷 1007-1014页

作者： Ning Huang Gregory Day Xinyu Yang Hannah Drake Hong-Cai Zhou Department of Chemistry Texas A&M University College Station

As atmospheric CO_2 levels rise, the development of physical or chemical adsorbents for CO_2 capture and separation is of great importance on the way towards a sustainable low-carbon future. Porous organic polymers are promising candidates for CO_2 capture materials owing to their structural flexibility, high surface area, and high stability. In this review, we highlight high-performance porous organic polymers for CO_2 capture and summarize the strategies to enhance CO_2 uptake and selectivity, such as increasing surface area, increasing interaction between porous organic polymers and CO_2, and pore surface functionalization.

关键词： porous organic polymers CO2 capture nanomaterials post-synthesis polymer

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