Influence of Support Structural Characteristics on Long-term Performance of Pd-Ag/α-Al2O3 Catalyst for Tail-end Acetylene Selective Hydrogenation
-
Maryam Takht Ravanchi
,
Saeed Sahebdelfar
Abstract
The selective hydrogenation of acetylene to ethylene in acetylene/ethylene mixture over Pd-Ag/α-Al2O3 catalysts prepared by sequential impregnation method was studied. The α-Al2O3 support was prepared by thermal treatment of γ-Al2O3 in temperature range of 1,090–1,100 °C. The samples were characterized for their structural properties and coke deposition. They showed egg-shell structure with penetration depth increasing with sintering temperature of the support. A kinetic model based on 1st order in acetylene and 0.5th order in hydrogen for the main reaction and 2nd order independent decay law for catalyst deactivation was used to fit the conversion-time data and to obtain quantitative assessment of catalyst performances. Fair fits were observed from which the reaction and deactivation rate constants were evaluated. The highest selectivity to ethylene, and therefore best performance, was obtained for the highest calcination temperature which was attributed to its lower acidity and larger pore diameters.
Nomenclature
- a
catalyst activity
- Ci
concentration of species i (mol/m3)
- Fi
molar flow rate of species i (mol/h)
- k
reaction rate constant (m7.5/(kg.mol0.5.h))
- kd
catalyst deactivation rate constant (h–1)
- r’i
rate of disappearance for species i per mass of catalyst (mol/(kg·h))
- t
time on stream (TOS) (h)
- W
catalyst weight (kg)
- X
conversion of key component, A
- Subscript
- A
acetylene
- A0
acetylene in feed
- B
hydrogen
- Greek symbols
hydrogen / acetylene molar ratio (mol/mol)
- τ′
capacity factor (catalyst weight per volumetric feed flow rate) (kg.h/m3)
- ν
volumetric flow rate (m3/h)
- α
constant used in eq. (8)
- α0
constant used in eq. (8)
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©2016 by De Gruyter
Articles in the same Issue
- Frontmatter
- Catalytic Activity of Bimetallic Cu-Ag/MgO-SiO2 Toward the Conversion of Ethanol to 1,3-Butadiene
- Heat Transfer Studies in Ejector-induced Downflow Bubble Column
- Experimental Study on Atomizing and Reaction Performance of Pressure Swirl Nozzles in Ethoxylation Reactor
- Study of the Hydrodynamics and Mass Transfer Coefficient in a 2D Mimicked FT Slurry Bubble Columns for Alternative Clean Energy and Chemical Production
- Simultaneous Removal of Organic and Inorganic Pollutants From Landfill Leachate Using Sea Mango Derived Activated Carbon via Microwave Induced Activation
- Computational Fluid Dynamics Simulations of Lean Premixed Methane-Air Flame in a Micro-Channel Reactor Using Different Chemical Kinetics
- Membrane Aerated Biofilm Reactors for Thermomechanical Pulping Pressate Treatment
- Mixing of Shear Thinning Fluids in Cylindrical Tanks: Effect of the Impeller Blade Design and Operating Conditions
- Influence of Support Structural Characteristics on Long-term Performance of Pd-Ag/α-Al2O3 Catalyst for Tail-end Acetylene Selective Hydrogenation
- Investigation of Key Factors and Their Interactions in MTO Reaction by Statistical Design of Experiments
- Hydrogen Production via Glycerol Reforming over Pt/SiO2 Nanocatalyst in a Spiral-Shaped Microchannel Reactor
- Experimental Design-Assisted Investigation of Light Olefins Production Over Ceria-Altered HZSM-5 Catalysts by Naphtha Catalytic Steam Cracking
- Investigation of α-Amylase Production with Bacillus amyloliquefaciens in a Cocurrent Downflow Contacting Reactor
- Gaseous Hydrocarbon Synfuels from Renewable Electricity via H2/CO2-Flexibility of Fixed-Bed Catalytic Reactors
- Natural Convective Flow Analysis For Nanofluids With Reynold,s Model of Viscosity
Articles in the same Issue
- Frontmatter
- Catalytic Activity of Bimetallic Cu-Ag/MgO-SiO2 Toward the Conversion of Ethanol to 1,3-Butadiene
- Heat Transfer Studies in Ejector-induced Downflow Bubble Column
- Experimental Study on Atomizing and Reaction Performance of Pressure Swirl Nozzles in Ethoxylation Reactor
- Study of the Hydrodynamics and Mass Transfer Coefficient in a 2D Mimicked FT Slurry Bubble Columns for Alternative Clean Energy and Chemical Production
- Simultaneous Removal of Organic and Inorganic Pollutants From Landfill Leachate Using Sea Mango Derived Activated Carbon via Microwave Induced Activation
- Computational Fluid Dynamics Simulations of Lean Premixed Methane-Air Flame in a Micro-Channel Reactor Using Different Chemical Kinetics
- Membrane Aerated Biofilm Reactors for Thermomechanical Pulping Pressate Treatment
- Mixing of Shear Thinning Fluids in Cylindrical Tanks: Effect of the Impeller Blade Design and Operating Conditions
- Influence of Support Structural Characteristics on Long-term Performance of Pd-Ag/α-Al2O3 Catalyst for Tail-end Acetylene Selective Hydrogenation
- Investigation of Key Factors and Their Interactions in MTO Reaction by Statistical Design of Experiments
- Hydrogen Production via Glycerol Reforming over Pt/SiO2 Nanocatalyst in a Spiral-Shaped Microchannel Reactor
- Experimental Design-Assisted Investigation of Light Olefins Production Over Ceria-Altered HZSM-5 Catalysts by Naphtha Catalytic Steam Cracking
- Investigation of α-Amylase Production with Bacillus amyloliquefaciens in a Cocurrent Downflow Contacting Reactor
- Gaseous Hydrocarbon Synfuels from Renewable Electricity via H2/CO2-Flexibility of Fixed-Bed Catalytic Reactors
- Natural Convective Flow Analysis For Nanofluids With Reynold,s Model of Viscosity
