Silica Alumina Catalysts
Acid properties of silica alumina catalysts and catalytic
2021 3 12 The effect of silica–alumina catalysts on degradation of polyolefins by a continuous flow reactor Journal of Analytical and Applied Pyrolysis 2010 89 1 30 38
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Silica supported catalysts get a new breath of life
2015 12 4 In heterogeneous catalysis metals metal oxides and metal sulfides are traditionally dispersed as nanoscale particles on a support with a large surface area so as to maximize the number of exposed active sites Historically alumina supports have been used for the majority of refining applications but where acid sites catalyze unwanted isomerization or oligomerization reactions silica
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Silica alumina catalysts
Silica alumina catalyst support 1968 09 24 Colgan et al 252/451 Process for preparing siliceous aerogels 1963 02 26 Jenkins et al 252/451 Preparation of silica alumina compositions 1960 04 19 Braithwaite 252/451 Production of silica containing catalysts of high pore diameter 1958 06 17 Innes 252/451
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Fe ZSM 5 catalysts with different silica alumina ratios
The Fe ZSM 5 catalysts were prepared with H ZSM 5 of different Si/Al ratios by wet ion exchange and chemical vapor deposition Then the catalysts were investigated by XRD BET TEM UV vis and NH3 TPD technologies to analyze the iron states in Fe ZSM 5 zeolites The results showed that after H ZSM 5
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Alumina and silica oxides as catalysts for the oxidation
2005 11 30 Alumina or silica gel are used as catalysts for a solvent free oxidation of benzoins to the corresponding benzils These catalysts are easily recovered after completion of the reactions which are carried out either by heating in a sand bath or using microwave irradiation Comparison of the results obtained with both catalysts indicates that
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OPTIMUM DESIGN OF ZEOLITE/SILICA ALUMINA
2018 6 7 An analysis of the rate of formation of the desired product and of the selectivity has been carried out for composite catalysts wherein small particles of zeolite are distributed nonuniformly within a large particle of the more porous silica alumina
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An overview on alumina silica based aerogels
In catalysis alumina silica aerogels have shown equivalent performance when compared to reference catalysts In the field of thermal insulation these materials show great potential especially in high temperatures environments due to their thermal dimensional stability
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On the role of acidity in amorphous silica alumina based
Amorphous silica alumina ASA is widely used as a solid acid catalyst or as a carrier for well dispersed metal sulfide or metal catalysts They are often involved in hydrocracking catalyst formulations especially so when the aim is to produce middle distillates from heavy oil fractions
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The BASF portfolio includes proprietary alumina silica alumino silica gels and a broad line of base metal oxide guard bed materials including the PuriStar family At BASF our Fluid Catalytic Cracking FCC catalyst and additive offerings together with our expert technical services build the right solution to create value within any unit s
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Highly selective PdCu/amorphous silica alumina ASA
2011 5 1 In this study PdCu bimetallic catalysts supported on an industrial amorphous silica alumina ASA were synthesized and used to simulate catalytic removal of nitrate in groundwater The catalysts exhibited very high activity and the highest catalytic selectivity toward N₂O and N₂ was 90 2 The optimal Pd/Cu weight ratio was four
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Polystyrene pyrolysis using silica alumina catalyst in
2015 1 14 The silica alumina catalyst showed a good performance for the catalytic degradation of Polystyrene without much formation of residues or cokes at 410 C All the runs produced aromatic liquid oils with high selectivity While styrene is the major product in both thermal and catalytic degradation over the solid acid catalysts significant
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Silica Alumina Catalysts with
Subscriber access provided by University of Massachusetts Amherst Libraries Article Hydrogenation of Acetophenone on Pd/Silica Alumina Catalysts with Tunable Acidity Mechanistic Insight by In Situ ATR IR Spectroscopy Mengmeng Chen Nobutaka Maeda Alfons Baiker and Jun Huang ACS Catal Just Accepted Manuscript DOI 10 1021/acscatal 8b00169 Publication Date Web 30 May 2018
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γ Alumina and Amorphous Silica–Alumina Structural
2017 8 14 Alumina and silica–alumina are among the most relevant materials applied in the field of industrial catalysis 1 2 3 Both are prepared as high surface area powders characterized by a significant surface acidity and may be applied as acid catalysts On the other hand they are also widely used as supports for heterogeneous catalysts
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PDF Sol gel processed silica alumina materials for
3818 Langmuir 2000 16 3818 3822 Sol Gel Processed Silica Alumina Materials for Diesel Engine Emission Reduction Catalysts C K Narula and M Rokosz Chemistry Department Ford Motor Company MD 3083 P O Box 2053 Dearborn Michigan 48121 L F Allard High Temperature Materials Laboratory ORNL Oak Ridge Tennessee 37831 R J Kudla and M S Chattha Chemical
Get PriceColloidal Silica in Catalysts
2021 9 29 LUDOX colloidal silicas have a proven track record of high performance in many catalytic applications For years LUDOX colloidal silicas have been used to manufacture catalysts for fluid cracking emissions control and a variety of chemical syntheses Most commonly they offer excellent binding power and high temperature stability Further the chemical inertness of sintered silica
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Optimization of Tailoring of CuOx Species of Silica
The supported copper catalysts on the hollow spheres showed higher conversion of nitrous oxide than supported copper catalyst on fine silica–alumina composite particles The catalyst activity
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Alumina Catalysts
Alumina Catalysts Aluminum oxide is present in large quantities in the earth s crust and is derived from bauxite ore Commonly called alumina this oxide is a fascinating material which has found extensive use as a catalyst and catalyst support in the chemical and petrochemical industries Featured Download
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Acid properties of silica alumina catalysts and catalytic
1993 12 1 A relationship between the acid strengths and amounts of silica alumina catalysts and the compositions of products formed by the catalytic degradation of polyethylene at 673 K was studied The acid strengths and amounts were varied with SiO sub 2 /Al sub 2 O sub 3 weight ratio in the catalysts
Get PriceSilica‐Alumina‐Supported Tungsten‐Based Heterogeneous
2007 1 18 Silica Alumina Supported Tungsten Based Heterogeneous Alkane Metathesis Catalyst Is it Closer to a Silica or an Alumina Supported System Erwan Le Roux Laboratory of Surface Organometallic Chemistry UMR 9986 Ecole Supérieure de Chimie Physique Electronique de Lyon 43 Bd du 11 Novembre 1918 69616 Villeurbanne Cedex France Fax 33
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Acid properties of silica alumina catalysts and catalytic
1993 12 1 A relationship between the acid strengths and amounts of silica alumina catalysts and the compositions of products formed by the catalytic degradation of polyethylene at 673 K was studied The acid strengths and amounts were varied with SiO sub 2 /Al sub 2 O sub 3 weight ratio in the catalysts
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Acidity and catalytic activity of zeolite catalysts bound
2004 9 30 Silica from the binder may react with extra framework alumina in zeolites to form a new protonic acid SiO2 bound catalysts have less strong acidity Bronsted acidity and Lewis acidity than the zeolite powder Also the strength of strong acid sites of the zeolites is reduced when silica is embedded Micropore surface area and micropore volume
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Adsorbents
2021 9 29 The BASF portfolio includes proprietary alumina silica alumino silica gels and a broad line of base metal oxide guard bed materials including the PuriStar family At BASF our Fluid Catalytic Cracking FCC catalyst and additive offerings together with our expert technical services build the right solution to create value within any unit s
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PDF Hydrogenation of tetralin on silica–alumina
Hydrogenation of tetralin on silica–alumina supported Pt catalysts I Physicochemical characterization of the catalytic materials Journal of Catalysis 2007 J Lercher
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Nickel on silica/alumina extent of labeling 65 wt
Nickel on silica/alumina can be used as an efficient catalyst in a variety of applications such as in plastic waste pyrolysis for the production of fuel to study the supercritical water reforming of glycerol in the supercritical water reforming of acetic acid for the production of hydrogen
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Pricing GF fiber Al2O3 80 /SiO2 20 tex number 205 length 50 m filament diameter 0 01mm Pricing See All 7 Match Criteria Product Name Nickel on
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Acidity of Amorphous Silica Alumina Catalysts
2021 7 9 Acidity of Amorphous Silica Alumina Catalysts First principles calculations reveal the dominant acid sites on the amorphous silica alumina ASA catalyst surface Based on the strength of interac tion with Lewis base probe molecules the bridg ing and pseudo bridging silanol PBS species are determined to be the most acidic and therefore
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SYNTHESIS AND CHARACTERIZATION OF
2021 9 29 characterization of amorphous silica alumina both pure and metal modified and the catalytic evaluation of these materials for the conversion of chloromethane 2 MATERIALS AND METHODS 2 1 Catalyst synthesis Silica alumina support with a Si/Al ratio of 2 50 was purchased from Sigma Aldrich It was characterized by the BET method and the pore
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Description carrier materials include silica alumina silica zirconia titania silica and silicon carbide Saint Gobain NorPro also offers a range of attrition resistant porous low surface area fluidizable aluminas as the basis of active and stable fluid bed catalysts Material Composition Aluminum Oxide Silica Glass Pore Size 0 7000 to 150 nm
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Ethylene polymerization with methylaluminoxane nBuCp
2010 10 19 Catalysts supported on silica alumina are more active than those supported on silica needing less MAO to reach similar productivity which constitutes an important advantage from an economical and environmental point of view Supported catalysts were characterized by ICP AES SEM energy dispersive X ray spectrometer and UV Vis spectroscopy
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2019 5 25 Product Distribution in Degradation of Polypropylene over Silica Alumina and CaX Zeolite Catalysts Bulletin of the Chemical Society of Japan 1983 56 9 2768 2773
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1998 3 1 For chemical recycling of waste plastics HZSM 5 HY and H mordenite zeolites and silica alumina were examined as catalysts for the degradation of polyethylene in a fixed bed flow reactor system and their activities and deactivation behaviors caused by
Get PriceRhodium Supported on Silica Stabilized Alumina for
2010 11 2 Abstract Silica stabilized alumina calcined at 1200 C has been used as a support for rhodium catalysts and tested in catalytic decomposition of N 2 O propellant Significant enhancement of catalytic performance was obtained on the silica stabilized catalyst owing to the thermally stable structure favoring the stabilization of Rh 0 species and desorption of oxygen during the decomposition
Get PriceSolved The rate constant for the first order cracking of
Transcribed image text The rate constant for the first order cracking of cumene on a silica alumina catalyst was measured to be 0 80 cm/s gcat in a laboratory reactor SO CH CHCH Cumene Benzene Propylene Using the following data determine if there is an influence of internal diffusion on the observed rate constant D 10 10cm Data 2 12 gcat/cm R 0 25 cm The elementary irreversible
Get PricePolystyrene pyrolysis using silica alumina catalyst in
2015 1 14 The silica alumina catalyst showed a good performance for the catalytic degradation of Polystyrene without much formation of residues or cokes at 410 C All the runs produced aromatic liquid oils with high selectivity While styrene is the major product in both thermal and catalytic degradation over the solid acid catalysts significant
Get PriceCPN Activated Alumina
The BASF portfolio includes proprietary alumina silica alumino silica gels and a broad line of base metal oxide guard bed materials including the PuriStar family At BASF our Fluid Catalytic Cracking FCC catalyst and additive offerings together with our expert technical services build the right solution to create value within any unit s
Get PriceSilica‐Alumina‐Supported Tungsten‐Based Heterogeneous
2007 1 18 Silica Alumina Supported Tungsten Based Heterogeneous Alkane Metathesis Catalyst Is it Closer to a Silica or an Alumina Supported System Erwan Le Roux Laboratory of Surface Organometallic Chemistry UMR 9986 Ecole Supérieure de Chimie Physique Electronique de Lyon 43 Bd du 11 Novembre 1918 69616 Villeurbanne Cedex France Fax 33
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