I.r. studies on the acidity of dealuminated Y zeolite with different probe molecules |
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| Affiliation: | 1. State Key Laboratory of High Power Semiconductor Lasers, Changchun University of Science and Technology, Changchun 130022, Jilin, China;2. School of Civil and Environmental Engineering and the Brook Byers Institute for Sustainable Systems, Georgia Institute of Technology, 800 West Peachtree Street, Suite 400 F-H, Atlanta, Georgia, 30332-0595, United States;1. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China;2. Translational Medicine Research Center, Shanxi Medical University, Taiyuan, Shanxi 030001, China;1. Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia;2. School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia;3. Center of Hydrogen Energy, Institute of Future Energy, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia;1. Hebei Province Low-Carbon and Clean Building Heating Technology Innovation Center, Yanshan University, Qinhuangdao, 066004, China;2. Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering of Hebei Province, Yanshan University, Qinhuangdao, 066004, China;3. Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO, 65211, USA;1. National Engineering Laboratory for Reducing Emissions from Coal Combustion, Engineering Research Center of Environmental Thermal Technology of Ministry of Education, Shandong Key Laboratory of Energy Carbon Reduction and Resource Utilization, School of Energy and Power Engineering, Shandong University, Jinan, Shandong 250061, China;2. School of Energy and Power Engineering, Shandong University, Jinan 250061, China;3. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;1. Key Laboratory for Green Chemical Technology of State Education Ministry, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, PR China;2. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, PR China;3. State Key Laboratory of Engines, Tianjin University, Tianjin 300072, PR China;4. General Motors Global Research and Development, Chemical Sciences and Materials Systems Lab, 3500 Mound Road, Warren, MI 48090, USA |
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| Abstract: | Dealuminated HY zeolites (D-HY), which are partly reexchanged by La ions (D-LaHY), show two i.r. bands at 3625 cm−1 (high frequency) and 3550 cm−1 (low frequency). In contrast to the findings in D-HY and nondealuminated La-exchanged Y zeolite (LaHY), the LF band of D-LaHY is considerably affected by the adsorption of butadiene, in connection with a strongly increased coking. Sorption experiments with pyridine and ammonia confirm the OH groups belonging to the LF band to be acidic and accessible even to pyridine. This can be further confirmed by an HD exchange reaction with C6D6 at room temperature. |
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