23rd
North American Catalysis Society Meeting, June 2-7, 2013, Louisville, Kentucky
The
Role of Nano-structured Materials in the Development of Catalytic Conversion
Processes
Giuseppe Bellussi, Eni Refining & Marketing Division, Italy.
Abstract
Author
discusses the relationship between structured materials and industrial
applications using examples taken from the direct experience of the author in a
variety of conversion processes spanning in both the chemicals and refining
industries.
Synopsis
The availability of new materials with original and innovative properties is
one of the pillars on which it is based the progress in many industrial
technologies. For catalytic conversion processes the research of new materials
has the objective to improve yield, selectivity, catalytic stability and reduce
the formation of by-products and energy consumption. Often these improvements
are the consequence of the reduction of diffusion limitations and / or the
improvement of the active sites structure. This is one of the reasons for which
the research efforts of nano-structured and ordered materials have been
strengthened. Crystalline or amorphous pseudo-ordered oxides with different
porosity and surface area, transition metal sulphides, metal nanoclusters are
examples of materials among those most frequently studied by academic and industrial
research centers.
Full Text Source (Subscription or Fee): https://nam.confex.com/nam/2013/webprogram/Paper9583.html
Showing posts with label NANOSTRUCTURES. Show all posts
Showing posts with label NANOSTRUCTURES. Show all posts
Monday, December 9, 2013
Friday, November 15, 2013
Effect of Different TEAOH/TEA/DEA/MOR Combinations on Nanostructured CoSAPO-34 Synthesis and Catalytic Performance toward Methanol to Light Olefins
The 1st Iran Energy Association National Conference - 2013 Tehran
Effect of Different TEAOH/TEA/DEA/MOR Combinations on Nanostructured CoSAPO-34 Synthesis and Catalytic Performance toward Methanol to Light Olefins
Sogand Aghamohammadi, Mohammad Haghighi
haghighi@sut.ac.ir
Reactor and Catalysis Research Center (RCRC), Chemical Engineering Faculty, Sahand University of Technology, Sahand New Town, Tabriz, Iran
Abstract
SAPO-34 molecular sieve has been reported to be the most promising catalyst for methanol to olefins (MTO) process. SAPO-34s templated with TEAOH showed excellent catalytic performance for MTO reaction. However, its relative higher cost would be a significant obstacle to commercial production. Co was evidenced to be capable of incorporating in to crystalline structure resulted in elimination of side reactions. In this research, three sets of mixed templates are taken in to account, being TEAOH/TEA, TEAOH/DEA and TEAOH/morpholine with constant composition of 50%: 50%. Prepared samples were characterized by XRD, FESEM, BET and FTIR techniques. XRD patterns reflected the higher crystallinity of the catalyst synthesized with TEAOH/morpholine mixture. The FESEM results indicated that the nature of the template determines the morphology of nanostructured CoAPSO-34s. The catalytic performance was in a range of 300- 500ºC. Stability test was carried out to find out the effect of time on steam.
INTRODUCTION
Remarkable array of light olefins applications creates a sense of excitement among researchers to explore newly accepted processes like methanol to olefins (MTO). Among the leading candidate catalysts, silicoaluminophosphate SAPO-34 molecular sieve exhibits higher selectivity toward light olefins. However, it suffers from rapid deactivation by the blockage of pore mouth arisen from the coke formation. In the present work, cobalt was chosen to be used for the SAPO-34 synthesis due to its proven excellent performance in MTO reaction. Moreover, it has been synthesized with TEAOH in most cases as the organic template and exhibit accepted activity. But, its relative higher cost would be a significant obstacle to commercial production. During the recent years, several researchers carried out experiments to determine the optimized ratios of template mixtures with the aim of decreasing the portion of TEAOH. The main objective of this work is the synthesis of CoAPSO-34s with mixed templates including TEAOH. Three samples were synthesized with TEAOH/TEA, TEAOH/morpholine and TEAOH/DEA mixtures with simultaneous Co metal addition. Physical properties of the catalysts were identified by XRD, FESEM, BET and FTIR techniques. Performance tests were carried out to investigate the influence of different temperatures on the catalyst activity. The stability test was conducted to investigate the effect of time on stream.
Free Full Text Source: http://ieanc.com/cd/2013/papers/1214.pdf
Effect of Different TEAOH/TEA/DEA/MOR Combinations on Nanostructured CoSAPO-34 Synthesis and Catalytic Performance toward Methanol to Light Olefins
Sogand Aghamohammadi, Mohammad Haghighi
haghighi@sut.ac.ir
Reactor and Catalysis Research Center (RCRC), Chemical Engineering Faculty, Sahand University of Technology, Sahand New Town, Tabriz, Iran
Abstract
SAPO-34 molecular sieve has been reported to be the most promising catalyst for methanol to olefins (MTO) process. SAPO-34s templated with TEAOH showed excellent catalytic performance for MTO reaction. However, its relative higher cost would be a significant obstacle to commercial production. Co was evidenced to be capable of incorporating in to crystalline structure resulted in elimination of side reactions. In this research, three sets of mixed templates are taken in to account, being TEAOH/TEA, TEAOH/DEA and TEAOH/morpholine with constant composition of 50%: 50%. Prepared samples were characterized by XRD, FESEM, BET and FTIR techniques. XRD patterns reflected the higher crystallinity of the catalyst synthesized with TEAOH/morpholine mixture. The FESEM results indicated that the nature of the template determines the morphology of nanostructured CoAPSO-34s. The catalytic performance was in a range of 300- 500ºC. Stability test was carried out to find out the effect of time on steam.
INTRODUCTION
Remarkable array of light olefins applications creates a sense of excitement among researchers to explore newly accepted processes like methanol to olefins (MTO). Among the leading candidate catalysts, silicoaluminophosphate SAPO-34 molecular sieve exhibits higher selectivity toward light olefins. However, it suffers from rapid deactivation by the blockage of pore mouth arisen from the coke formation. In the present work, cobalt was chosen to be used for the SAPO-34 synthesis due to its proven excellent performance in MTO reaction. Moreover, it has been synthesized with TEAOH in most cases as the organic template and exhibit accepted activity. But, its relative higher cost would be a significant obstacle to commercial production. During the recent years, several researchers carried out experiments to determine the optimized ratios of template mixtures with the aim of decreasing the portion of TEAOH. The main objective of this work is the synthesis of CoAPSO-34s with mixed templates including TEAOH. Three samples were synthesized with TEAOH/TEA, TEAOH/morpholine and TEAOH/DEA mixtures with simultaneous Co metal addition. Physical properties of the catalysts were identified by XRD, FESEM, BET and FTIR techniques. Performance tests were carried out to investigate the influence of different temperatures on the catalyst activity. The stability test was conducted to investigate the effect of time on stream.
Free Full Text Source: http://ieanc.com/cd/2013/papers/1214.pdf
Wednesday, October 23, 2013
Ultrasound assisted dispersion of different amount of Ni over ZSM-5 used as nanostructured catalyst for hydrogen production via CO2 reforming of methane
Energy
Conversion and Management, Volume 76, December 2013, Pages 1093–1103
Ultrasound assisted dispersion of different amount of Ni over ZSM-5 used as nanostructured catalyst for hydrogen production via CO2 reforming of methane
Yaser Vafaeian, Mohammad Haghighi, Sogand Aghamohammadi
Chemical Engineering Faculty, Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran
Reactor and Catalysis Research Center (RCRC), Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran
Abstract
Carbon dioxide reforming of methane is an promising route for synthesis gas production, especially over nanostructured catalysts. Authors describe nanocatalyst development using the sonochemical method for dry reforming of methane with the goal of determining the most efficient nanocatalyst.
Researchers consider the effect of Ni metal content on the properties of the ZSM-5 supported nanocatalysts. They fabricated the Ni/ZSM-5 nanocatalysts with the assisted traditional impregnation method via ultrasound irradiation. The nanocatalysts were characterized with XRD, FESEM, TEM, BET and FTIR. Comparison of XRD patterns suggests that the peaks related to NiO become sharper by increasing metal content over the support. In the case of nanocatalysts with lower metal content (3% and 8%), the beneficial influence of ultrasound assisted procedure became more pronounced.
Full Text Source (Subscription or Fee): http://www.sciencedirect.com/science/article/pii/S019689041300469X
Ultrasound assisted dispersion of different amount of Ni over ZSM-5 used as nanostructured catalyst for hydrogen production via CO2 reforming of methane
Yaser Vafaeian, Mohammad Haghighi, Sogand Aghamohammadi
Chemical Engineering Faculty, Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran
Reactor and Catalysis Research Center (RCRC), Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran
Abstract
Carbon dioxide reforming of methane is an promising route for synthesis gas production, especially over nanostructured catalysts. Authors describe nanocatalyst development using the sonochemical method for dry reforming of methane with the goal of determining the most efficient nanocatalyst.
Researchers consider the effect of Ni metal content on the properties of the ZSM-5 supported nanocatalysts. They fabricated the Ni/ZSM-5 nanocatalysts with the assisted traditional impregnation method via ultrasound irradiation. The nanocatalysts were characterized with XRD, FESEM, TEM, BET and FTIR. Comparison of XRD patterns suggests that the peaks related to NiO become sharper by increasing metal content over the support. In the case of nanocatalysts with lower metal content (3% and 8%), the beneficial influence of ultrasound assisted procedure became more pronounced.
Full Text Source (Subscription or Fee): http://www.sciencedirect.com/science/article/pii/S019689041300469X
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