Journal of Industrial and Engineering Chemistry, https://doi.org/10.1016/j.jiec.2011.12.011. The EDX mappings (B and C) of Ag and Cl indicated that the most of the particles included Ag, and some of them included Cl. Figure 4. When Ag was added to the Pt/Al2O3, the conversion significantly increased from 28.5 to 37.6% with the increasing selectivity of the desired products. Kurokawa, H. , Namoto, H. , Horinouchi, A. , Sato, M. , Usui, M. , Ogihara, H. and Miura, H. (2018) Dehydrogenation of n-Butane to Butenes and 1,3-Butadiene over PtAg/Al. Chloride ions were added to the Ag-added Pt/Al2O3 using an aqueous solution of NH4Cl by an impregnation method. Oxidative dehydrogenation of n-butane to butenes ... 100, n-butane conversion of 34.5% and total butene selectivity of 79.3% were achieved at 630 C. To the best of our knowledge, the oxidative dehydrogenation performance of the synthesized Mo-doped VMgO catalysts described in AB - V-Mg-O catalyst was prepared by impregnation method and characterized by XRD and BET techniques. The Ag addition was performed by impregnation using the Cl− removing granules and an aqueous solution of AgNO3. free Ag to AgCl which was inactive for the coke formation. The prepared catalysts were characterized by a surface area analysis (Microtrac BEL, BELSORP-mini II), X-ray diffraction analysis (XRD, Brucker, D2 phaser), X-ray fluorescent analysis (XRF, PANalytical, PW 2400), thermogravimetry-differential thermal analysis (TG-DTA, Shimazu, DTG-60), scanning electron microscopy with an energy dispersive X-ray analyzer (SEM-EDX, Hitachi, S-3400), and CO chemisorption (Hemmi Slide Rule, BP-1). Among various rare earth phosphates, CePO4 and LaPO4 were found to catalyze the oxidative dehydrogenation of iso-butane to iso-butene at 450–550°C using a feed gas of 75 mol% iso-butane and 5 mol% O2. endstream endobj 193 0 obj <>stream This fact meant that these particles consisted of AgCl and metallic Ag particles. In this case, the oxygen partial pressure in the catalyst bed could be decreased and the selectivity for C4 products (butene and butadiene) increased. During the preparation of all the PtAg/Al2O3 catalysts, residual Cl− derived from H2PtCl6 was removed by a steam treatment to avoid AgCl formation by the reaction of a Ag compound with Cl− before the following steps. The dehydrogenation of n-butane is an attractive route to produce 1,3-butadiene (BD), because n-butane is a cheaper raw material. Research output: Contribution to journal › Article › peer-review. SEM-EDX photographs of PtAg/Al2O3 catalyst Cat D. (a) SEM photograph; (b) EDX mapping for Cl; (c) EDX mapping for Ag; and (d) EDX mapping for Pt. All the catalysts were reduced with a 40 vol% H2 (He balance) at the reaction temperature for 1 h just before the dehydrogenation. It can be concluded that acidic character is a key factor in the selective oxidative dehydrogenation of iso-butane over the rare earth phosphate catalysts. �|+�Ϳ�4����ߕ�D6G���yN�'�=i��p"��Z��$��=kh�h5�Z�:�����3p&�o��MK��L��r��$6��L��6��0��~H2��>����g4rF�. At 550˚C, helium (50 ml/min) and steam (37 ml/min) were introduced into the reactor, and this steam treatment (steaming) was performed for 5 h to remove the Cl− for the Cats B-D preparation (30 min for the Cat A preparation). For this preparation, the H2PtCl4-supported on Al2O3 was calcined and pre-reduced before the steaming (the Cl− removal step). An inert ceramic membrane was modified by partially coating with glaze for suitable gas permeability. By continuing you agree to the use of cookies. Metal pyrophosphates catalyze the oxidative dehydrogenation of iso-butane to iso-butene at 450–550°C using the feed gas of 75 mol% iso-butane and 5% O 2. An Academic Publisher, Dehydrogenation of n-Butane to Butenes and 1,3-Butadiene over PtAg/Al2O3 Catalysts in the Presence of H2 (). Copyright © 2006-2020 Scientific Research Publishing Inc. All Rights Reserved. The oxidative dehydrogenation of butane to butene and butadiene was studied using conventional fixed-bed reactor, inert membrane reactor, and mixed inert membrane reactor. In this case, the oxygen partial pressure in the catalyst bed could be decreased and the selectivity for C4 products (butene and butadiene) increased. The addition of Cl− was considered to be able to convert the. 20 wt% V as V 2 O 5 on MgO and 17.8 wt% Mo as MoO 3 on MgO were used as catalyst for the ODH of n-butane. This low amount of the CO chemisorption might be caused by the formation of PtAg bimetallic compounds. UR - http://www.scopus.com/inward/record.url?scp=0034262286&partnerID=8YFLogxK, UR - http://www.scopus.com/inward/citedby.url?scp=0034262286&partnerID=8YFLogxK, Powered by Pure, Scopus & Elsevier Fingerprint Engine™ © 2020 Elsevier B.V, "We use cookies to help provide and enhance our service and tailor content. The membrane tube was used to distribute oxygen. Cat D: Cl− added catalyst by modified method. a. The granules calcined after the Pt addition were place in the center of a stainless-steel tubular reactor (internal diameter = 10 mm), then the reactor was placed in a tubular muffle furnace. In this study, we report a new Pt-based bimetallic catalyst for the SDH prepared by modification of the Pt/Al2O3 catalyst with Ag. Oxidative dehydrogenation of butane to butene and butadiene using inert membrane reactor. Outline of catalyst preparation. The selectivity of the butenes and 1,3-butadiene clearly increased with the reaction time (from 77% to 84%). author = "S. Ge and C. Liu and Y. The addition of Cl to the catalyst decreased the free Ag metal particles which formed a large amount of coke, resulting in the high activity and selectivity for the butenes and butadiene. Table 1. But the rest of the phosphates have only weak acid sites.
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