Calcined olefins

Effect of kaolin calcined temperature on the preparation and

2024年4月1日  The results showed that the catalysts prepared with 11% binder and calcined at 550 °C produced new Brønsted acid sites and had the largest pore size, promoted the 2024年11月13日  When reacted at 290 °C, 25 MPa, and 2500 mLg cat−1 h −1, the CO 2 conversion and selectivity of olefin were affected by the calcination temperature of the catalyst, Effect of Calcination Temperature in LargeAperture Medium2012年5月1日  Calcination in nitrogen atmosphere also decreased the production of light olefins and increased the formation of CH 4 Different characterization techniques such as XRD, BET, Effect of calcination conditions on the structure and catalytic For the samples calcined at 300 and 500 °C, the formation of nonblocked iron carbide can be enhanced by activation at higher temperatures, leading to higher catalytic activity Olefin selectivities of ∼60% C in the formed hydrocarbons Effects of calcination and activation conditions on

Light olefin production on the Co–Ni catalyst:

2020年4月13日  The obtained results have shown that the catalyst which was calcined at 550 °C for 6 h has revealed the better catalytic performance for production of light olefins In part 2 the effect of process conditions including 2022年5月18日  We demonstrate here that syngas conversion can be steered along a highly active and selective pathway towards light olefins via keteneacetate (acetyl) intermediates by Steering the reaction pathway of syngastolight olefins with 2023年11月27日  In this study, we reported a Namodified CoFebased catalyst for the direct conversion of syngas to olefins We observed a synergistic effect between the Co and Fe, and the Co2Fe1 catalyst exhibited higher activity A CoFe Bimetallic Catalyst for the Direct Conversion of 1999年3月24日  Selective epoxidation of olefins by hydrogen peroxide in water using a polyoxometalate catalyst supported on chemically modified hydrophobic mesoporous silica HydrotalciteCatalyzed Epoxidation of Olefins Using Hydrogen

Efficient SyngastoOlefins Conversion via Kaolin Modified SAPO

2023年4月24日  Abstract The preparation circumstances and effects of the kaolinmodified SAPO34 molecular sieves were studied in order to support the industrial application of the cuttingedge technology for producing light olefins from syngas catalyzed by bifunctional catalyst Additionally, their apparent morphology, crystal structure, structural features, and acid strength FeCo/KAl2O3 catalyst has been reported to be active and selective for olefin production from CO2 hydrogenation However, the effect of calcination temperature on the physicochemical properties of FeCo/KAl2O3 catalysts as well as their catalytic activity in CO2 hydrogenation to olefins has not yet been addressed Here, we show that the calcination temperature (400–800 Structure–activity relationships of FeCo/KAl2O3 catalysts calcined 2020年2月25日  1 Introduction Conversion of syngas, a mixture of H 2 and CO that derived from coal, nature gas or biomass, is a promising alternative nonpetroleum process to produce fuels [1, 2] and valuedadded chemicals such as olefins [3, 4], oxygenates [5, 6] and aromatics [7, 8]As lower olefins (referring to ethylene, propylene and butylene) are widely applied in the FischerTropsch to olefins over CoMnbased catalysts: Effect of Download scientific diagram XRD patterns of calcined samples from publication: Investigation of synthesis time and type of seed along with reduction of template consumption in the preparation XRD patterns of calcined samples Download Scientific Diagram

[PDF] CO2 hydrogenation to lower olefins on a high surface area

DOI: 101016/JAPCATB201607047 Corpus ID: ; CO2 hydrogenation to lower olefins on a high surface area Kpromoted bulk Fecatalyst @article{Visconti2017CO2HT, title={CO2 hydrogenation to lower olefins on a high surface area Kpromoted bulk Fecatalyst}, author={Carlo Giorgio Visconti and Michela Martinelli and Leonardo Falbo and Antonia Infantes‐Molina and selectivity to C~C 4 olefins exhibits a little increase while the catalytic activity clearly decreases It is necessary to choose a proper reaction condition so that the yield of light olefins from syngas will be a maximum 32 COTPD AND H2TPD The COTPD spectra for the FeMnO/MgO, FeMnO/A1203 and FeMnO/A new supported FeMnO catalyst for the production of light olefins 2020年4月1日  Selective CO 2 hydrogenation to light olefins over Fe‐Co/K‐Al 2 O 3 catalysts was enhanced by tuning bonding strengths of adsorbed species by varying the content of the K promotorTuning Interactions of Surface‐adsorbed Species over 2019年7月31日  Semantic Scholar extracted view of "Pore size effects on physicochemical properties of FeCo/KAl2O3 catalysts and their catalytic activity in CO2 hydrogenation to light olefins" by Thanapha Numpilai et alPore size effects on physicochemical properties of FeCo/KAl2O3

Highly active FeCoZn/KAl2O3 catalysts for CO2 ScienceDirect

2021年4月6日  CO 2 hydrogenation to light olefins over FeCoZn/KAl 2 O 3 catalysts with different Zn loading contents (0–174 wt%) is studied The addition of Zn improves the dispersion and the reducibility of iron oxides The amount of CO adsorbed of the catalysts showed a volcanic trend as a function of Zn content with its maximum of 242 μmol g −1 at 058 wt% Zn, 2022年2月1日  Olefins, in particular the linear αolefins (LAOs; C ≥ 4), are highvalued feedstocks for the XRD was used to characterize the crystal phases of Fe, ZnFe, NaFe and NaZnFe catalysts As shown in Fig 1 a, the calcined Fe and NaFe catalysts only exhibited the characteristic diffractions patterns attributed to Zn and Na promoted Fe catalysts for sustainable production of 2023年6月24日  22 Catalysts Synthesis A commercial ZSM5 catalyst was used as a reference for all tests The catalyst was provided by Süd Chemie (TZP302) in NH 4 + form (NH 4 + ZSM5) Prior to use, the zeolite was calcined in air at 550 °C for 5 h at a heating rate of 2 °C/min to ensure its protonation to HZSM5Controlling the Activity and Selectivity of HZSM5 Catalysts in the 2020年1月1日  SAPO34 was recovered by centrifugation, washed with deionized water, and dried in air at 100 °C Prior to use, SAPO34 powder was calcined at 600 °C for 4 h (with a ramp rate of 2 °C/min) For catalytic performance testing, the calcined SAPO34 powder was pelletized, crushed, and sieved to 40–80 particle US mesh size 22Direct conversion of syngas to light olefins (C2–C3) over a tandem

Structure–activity relationships of FeCo/KAl2O3 catalysts calcined

The FeCo/KAl2O3 catalyst calcined at 400 °C achieves the highest CO2 conversion, hydrocarbons selectivity and olefins yield of 490%, 906% and 181%, respectively The CO2 conversion and hydrocarbons selectivity decrease with ascending calcination temperature which is ascribed to the increase of metal oxides crystallite size, inducing stronger interactions 2011年8月10日  Rapid deactivation and short lifetime are challenges for SAPO34 catalysts for the reaction of methanol to olefins (MTO) To overcome these drawbacks, SAPO34 on fully calcined kaolin microspheres In Situ Synthesis of SAPO34 Grown onto Fully Calcined Kaolin 2024年4月1日  Effect of kaolin calcined temperature on the preparation and crystallization mechanism of SAPO34 molecular sieve for methanoltoolefins performanceEffect of kaolin calcined temperature on the preparation and DOI: 101016/JFUEL2020 Corpus ID: ; Tuning interaction of surfaceadsorbed species over Fe/KAl2O3 modified with transition metals (Cu, Mn, V, Zn or Co) on light olefins production from CO2 hydrogenationTuning interaction of surfaceadsorbed species over Fe/KAl2O3

Boosting CO2 hydrogenation to light olefins with low CO

Boosting CO 2 hydrogenation to light olefins with low CO selectivity through promoting HCOO* intermediates on FeZnGa 2 O 4 /SAPO34 Author links open overlay the dry gel was crushed in a crucible and transferred to a muffle furnace and calcined at 500°C for 4 h with a heating rate of 2 °C min −1 After cooling to room temperature, the The production of linear alphaolefins (αolefins) is a practical way to increase the economic potential of the Fischer–Tropsch synthesis The calcined Na 02 /Fe 1 Zn 12 O x catalysts exhibited distinct XRD peaks associated with ZnFe 2 O Linear αolefin production with Napromoted Fe–Zn catalysts2021年2月7日  Direct CO2 conversion to light olefins offers a chance to reduce CO2 emission with generating the revenue However, a lack of efficient catalysts is a barrier for promoting this technology to an industrial scale Here, we report a new catalytic system using a composite catalyst containing In2O3/SAPO34 and FeCo/KAl2O3 to enhance the light olefins yield The CO2 Hydrogenation to Light Olefins Over In2O3/SAPO34 and Fe 2022年1月24日  Green Epoxidation of Olefins with ZnxAl/MgxAlLDH The fresh LDHs were calcined to yield the corresponding mixed oxides and then the recovery of the LDH structure by hydration of the mixed (PDF) Green Epoxidation of Olefins with ZnxAl/MgxAlLDH

XRD patterns of precursor and calcined catalysts

Download scientific diagram XRD patterns of precursor and calcined catalysts (before and after the test) from publication: Effect of calcination and reaction conditions on the catalytic 2012年5月1日  All of these calcined catalysts were tested for Fischer–Tropsch synthesis under the same reaction conditions (T = 350 °C, P = 1 atm, H 2 /CO = 2/1 and GHSV = 5400 h −1) The obtained results are presented in Fig 4 The sample calcined at 600 °C for 6 h has shown the best catalytic performance for Fischer–Tropsch synthesisEffect of calcination conditions on the structure and catalytic 2020年7月27日  Abstract Light olefins (C2–C5) are highvalue platform chemicals used to produce plastics, lubricants, coating material, and surfactants, and can be intermediates to produce transportation fuels In this study we Production of Gaseous Olefins from Syngas over a Structure–activity relationships of FeCo/KAl2O3 catalysts calcined at different temperatures for CO2 hydrogenation to on physicochemical properties of FeCo/KAl2O3 catalysts and their catalytic activity in CO2 hydrogenation to light olefins T Numpilai, N Chanlek, Y PooArporn, S Wannapaiboon, CK Cheng, Applied Surface Science 483 ‪narong chanlek‬ ‪Google Scholar‬

Syngas to light olefins conversion with high olefin/paraffin

2019年3月21日  Microstructure of bifunctional catalysts a XRD patterns of the calcined ZnCrOx, AlPO18 and SAPO34 zeolites, SAPO34(club), AlPO18(spade), ZnCr2O4(heart), and ZnO(diamond) b SEM images of the 2023年8月15日  Light olefins (C 2 = −C 4 =) are the key building blocks in organic chemical industry After aging at 60 °C for 1 h, the solid product was centrifuged, washed, dried at 100 °C for 12 h, and then calcined in air at 450 °C for 4 h The obtained ZnAl oxide in this way by sequentialfeeding is labeled as ZASP unless otherwise Role of ZnAl oxide structure and oxygen vacancy in bifunctional 2011年3月1日  Preparation and Characterization of CoMn/TiO2 Catalysts for Production of Light Olefins March 2011 IRANIAN JOURNAL OF CHEMISTRY CHEMICAL ENGINEERINGINTERNATIONAL ENGLISH EDITION 30(1):1728(PDF) Preparation and Characterization of CoMn/TiO2 Catalysts for 2024年6月6日  The impregnated sample was calcined at 573 K for 4 h in air before applying in FTO reaction Analysis of the products confirmed that they include CO 2, lower olefins, paraffins, and oxygenates Catalytic activity and product selectivity at steady state were determined by gaschromatographic analysis of products up to 50% Visualizing Phase Evolution of Co Wiley Online Library

Synthesis of reaction‐adapted zeolites as methanoltoolefins

2018年7月12日  Methanoltoolefins (MTO) conversion over zeolites is a promising route for the production of light olefins Now, Corma and coworkers show that using mimics of reaction intermediates as structure 2021年2月19日  This paper provides a summary of the light olefins production via the FCC process and reviews the influences of the catalyst composition and HZSM5Calcined Fe/HZSM5Calcined Cr/HZSM5CalcinedA Review on Production of Light Olefins via Fluid Catalytic Cracking1 Introduction The conversion of syngas directly into light olefins (STO) has been considered as an efficient process to produce valuable chemicals from multiple carboncontaining resources such as coal, natural gas and biomass 1–5 The Conversion of syngas into light olefins over RSC Download scientific diagram XRD patterns of calcined samples (SAPO34, In2O3, In2O3/SAPO34 and FeCo/KAl2O3) and used TInS/BFeCo catalyst consisting of In2O3/SAPO34AF part and FeCo/K XRD patterns of calcined samples (SAPO34, In2O3,

Effective catalysts for hydrogenation of CO2 into lower olefins: A

Lower olefins are vital chemicals for the chemical industry based on the fact that they are noted for their wide range of usage as starting materials and precursors for the production KMnFe/Ce/γAl 2 O 3 (calcined at 500°C) and KMnFe/Ce/γAl 2 O 3 (calcined at 800°C), respectively It could be elucidated from these results that Ce is 2019年7月31日  In this work, the hydrogenation of CO 2 to light olefins has been studied over the FeCo/KAl 2 O 3 catalysts, while focusing on the impact by the pore sizes of Al 2 O 3 supports including 62 nm (SAl 2 O 3), 497 nm (MAl 2 O 3) and 1523 nm (LAl 2 O 3) on the structure and catalytic performanceThe characterization results demonstrate that the pore sizes of the Pore size effects on physicochemical properties of FeCo/KAl2O3 Structure activity relationships of FeCo/KAl2O3 catalysts calcined at different temperatures for CO2 hydrogenation to light olefins Journal APPLIED CATALYSIS AGENERAL (ISSN: X) Volume 547 IssuePage 219229 Year ตุลาคม 2017 ClassStructure activity relationships of FeCo/KAl2O3 catalysts calcined 2020年4月13日  Light olefins such as ethylene, propylene, and butylenes are widely used as raw materials in petrochemical industry and polyolefin production (FTIR) spectra of the calcined catalysts were measured in the range of 400–4000 cm −1 using a Bruker Vertex80 spectrometer for addressing the surface functional groupsHydrothermal synthesis of HZSM5 catalysts employing the

Direct synthesis of isoolefins from carbon dioxide hydrogenation

These results demonstrate that the synthesis of isoolefins via the tandem catalytic process underwent first CO 2 hydrogenation to nolefins and subsequent isomerization of nolefins to isoolefins Under the optimum reaction conditions ( Figure S3 ), a 352% C 4 C 7 isoolefin selectivity with an iso/nolefins ratio of 69 at 378% CO 2 conversion was obtained based on 2005年8月2日  Liquid phase alkylation of benzene to linear alkyl benzene (LAB) with αolefins has been investigated with 12silicotungstic acid supported on zirconia (STA/ZrO 2) as the catalystAmong the catalysts, 15 wt% STA/ZrO 2 calcined at 750 °C was found to be most active than others in the alkylation reaction The total amount of acid sites of different STA loaded Alkylation of benzene with αolefins over zirconia supported 12 A process is provided which is capable of producing olefins stably and efficiently by a metathesis reaction of identical or different olefins while preventing the lowering in metathesis catalyst activity due to trace impurities such as heteroatomcontaining compounds that are contained in a starting olefin The olefin production process includes supplying a starting olefin containing more than USA1 Olefin production process Google PatentsThe catalysts showed both Brønsted as well as Lewis acidity and 15% STA on zirconia calcined at 750 • C Chemical 237 (2005) 137–145 Alkylation of benzene with ␣olefins over zirconia supported 12silicotungstic acid Dhanashri P Sawant, SB Halligudi ∗ Inorganic Chemistry and Catalysis Division, National Chemical Laboratory Alkylation of benzene with αolefins over zirconia supported 12

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