Kinetic Modeling of Methanol Synthesis from Carbon Monoxide, Carbon Dioxide, and Hydrogen Over a Cu/ZnO/Cr2O3 Catalyst PDF Download
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Author: Daaniya Rahman
Publisher:
ISBN:
Category : Chemical kinetics
Languages : en
Pages : 84
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Book Description
The main purpose of this study was to investigate kinetic models proposed in the literature for methanol synthesis and select the best fit model using regression techniques in POLYMATH. Another aim was to use the results from the best fit model to explain some aspects and resolve some questions related to methanol synthesis kinetics. Two statistically sound kinetic models were chosen from literature based on their goodness of fit to the respective kinetic data. POLYMATH, the non-linear regression software, was used to fit published experimental data to different kinetic models and evaluate kinetic parameters. The statistical results from POLYMATH were used for comparison of the models and selection of the best fit model. The results obtained from the best fit kinetic model were then used to analyze the trends and kinetic features related to methanol synthesis. The study was primarily concentrated on the effect of reaction conditions on the relative contribution of CO and CO2 in producing methanol. The combined model that included both CO and CO2 hydrogenation rate terms was the best fit kinetic rate expression that described methanol synthesis kinetics most appropriately. A number of reaction conditions such as conversion, pressure, CO/CO2, and hydrogen content in the feed can have marked effects on the relative contribution of CO and CO2 in synthesizing methanol. Therefore, no generalizations can be made regarding the main carbon source in methanol.
Author: Daaniya Rahman
Publisher:
ISBN:
Category : Chemical kinetics
Languages : en
Pages : 84
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Book Description
The main purpose of this study was to investigate kinetic models proposed in the literature for methanol synthesis and select the best fit model using regression techniques in POLYMATH. Another aim was to use the results from the best fit model to explain some aspects and resolve some questions related to methanol synthesis kinetics. Two statistically sound kinetic models were chosen from literature based on their goodness of fit to the respective kinetic data. POLYMATH, the non-linear regression software, was used to fit published experimental data to different kinetic models and evaluate kinetic parameters. The statistical results from POLYMATH were used for comparison of the models and selection of the best fit model. The results obtained from the best fit kinetic model were then used to analyze the trends and kinetic features related to methanol synthesis. The study was primarily concentrated on the effect of reaction conditions on the relative contribution of CO and CO2 in producing methanol. The combined model that included both CO and CO2 hydrogenation rate terms was the best fit kinetic rate expression that described methanol synthesis kinetics most appropriately. A number of reaction conditions such as conversion, pressure, CO/CO2, and hydrogen content in the feed can have marked effects on the relative contribution of CO and CO2 in synthesizing methanol. Therefore, no generalizations can be made regarding the main carbon source in methanol.
Author: Daaniya Rahman
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659215421
Category :
Languages : en
Pages : 88
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Book Description
Methanol offers many benefits as an alternative energy source and is of use in a multitude of applications, therefore, optimizing and enhancing its production by modeling its reaction kinetics could be of considerable importance. Due to the disagreement on the methanol synthesis reaction scheme, there is always a scope to develop new and effective kinetic models which can prove to be useful in the improvement of the process resulting in high methanol yields and greater profits. The main purpose of this study was to investigate kinetic models proposed in the literature for methanol synthesis and select the best fit model using regression techniques in POLYMATH. Another aim was to use the results from the best fit model to explain some aspects and resolve some questions related to methanol synthesis kinetics. The statistical results from POLYMATH were used for comparison of the models and selection of the best fit kinetic model.
Author: Paul Serban Agachi
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110789868
Category : Technology & Engineering
Languages : en
Pages : 444
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Book Description
As a mature topic in chemical engineering, the book provides methods, problems and tools used in process control engineering. It discusses: process knowledge, sensor system technology, actuators, communication technology, and logistics, design and construction of control systems and their operation. The knowledge goes beyond the traditional process engineering field by applying the same principles, to biomedical processes, energy production and management of environmental issues. The book explains all the determinations in the "chemical systems" or "process systems", starting from the beginning of the processes, going through the intricate interdependency of the process stages, analyzing the hardware components of a control system and ending with the design of an appropriate control system for a process parameter or a whole process. The book is first addressed to the students and graduates of the departments of Chemical or Process Engineering. Second, to the chemical or process engineers in all industries or research and development centers, because they will notice the resemblance in approach from the system and control point of view, between different fields which might seem far from each other, but share the same control philosophy.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 107
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Book Description
A kinetic model that describes the methanol production rate over a CuO/ZnO/AI203 catalyst (United Catalyst L-951) at typical industrial operating conditions is developed using a slurry reactor. Different experiments are conducted in which the H2/(CO+CO2) ratio is equal to 2, 1, and 0.5, respectively, while the CO/CO2 ratio is held constant at 9. At each H2/(CO+CO2) ratio the space velocity is set at four different values in the range of 3000-13,000 1/hr kg{sub cat}. The effect of H2/(CO+CO2) ratio and space velocity on methanol production rate, conversions, and product composition is further investigated. The results indicate that the highest methanol production rate can be achieved at H2/(CO+CO2) ratio of 1 followed by H2/(CO+CO2) ratio of 0.5 and 2 respectively. The hydrogen and carbon monoxide conversions decrease with increasing space velocity for all H2/(CO+CO2) ratios tested. Carbon monoxide hydrogenation appears to be the main route to methanol at H2/(CO+CO2) ratio of 0.5 and 2. On the other hand, carbon dioxide hydrogenation appears to be the main route to methanol at H2/(CO+CO2) ratio of 1. At all H2/(CO+CO2) ratios, the extent of the reverse water gas shift reaction decreases with increasing space velocity. The effect of temperature on the kinetics is examined by using the same experimental approach at 508 K. It is found that a different reaction sequence takes place at each temperature. Also, a time on stream study is conducted simultaneously in order to investigate the characteristic of catalyst deactivation with time on stream. During the first 150 hours of time on stream, the catalyst loses approximately 2/3 of its initial activity before reaching a steady state activity.
Author: Geoffrey Garrison Pass
Publisher:
ISBN:
Category : Copper catalysts
Languages : en
Pages : 158
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Book Description
Author: Jerzy Skrzypek
Publisher:
ISBN:
Category : Catalysis
Languages : en
Pages : 174
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 107
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Book Description
A kinetic model that describes the methanol production rate over a CuO/ZnO/AI203 catalyst (United Catalyst L-951) at typical industrial operating conditions is developed using a slurry reactor. Different experiments are conducted in which the H2/(CO+CO2) ratio is equal to 2, 1, and 0.5, respectively, while the CO/CO2 ratio is held constant at 9. At each H2/(CO+CO2) ratio the space velocity is set at four different values in the range of 3000-13,000 1/hr kg{sub cat}. The effect of H2/(CO+CO2) ratio and space velocity on methanol production rate, conversions, and product composition is further investigated. The results indicate that the highest methanol production rate can be achieved at H2/(CO+CO2) ratio of 1 followed by H2/(CO+CO2) ratio of 0.5 and 2 respectively. The hydrogen and carbon monoxide conversions decrease with increasing space velocity for all H2/(CO+CO2) ratios tested. Carbon monoxide hydrogenation appears to be the main route to methanol at H2/(CO+CO2) ratio of 0.5 and 2. On the other hand, carbon dioxide hydrogenation appears to be the main route to methanol at H2/(CO+CO2) ratio of 1. At all H2/(CO+CO2) ratios, the extent of the reverse water gas shift reaction decreases with increasing space velocity. The effect of temperature on the kinetics is examined by using the same experimental approach at 508 K. It is found that a different reaction sequence takes place at each temperature. Also, a time on stream study is conducted simultaneously in order to investigate the characteristic of catalyst deactivation with time on stream. During the first 150 hours of time on stream, the catalyst loses approximately 2/3 of its initial activity before reaching a steady state activity.
Author:
Publisher: Academic Press
ISBN: 0080565352
Category : Technology & Engineering
Languages : en
Pages : 363
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Book Description
A significant part of the effort in catalysis research is based on an understanding that a more complete knowledge of the nature and behavior of reactive intermediates or chemisorbed complexes enables to produce better catalysts for industrial processes. The supporting cash flow is certainly based on this assumption. This volume presents written accounts of four different sectors of this effort.
Author: J Garrett Alexander
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Due to the substantial increase in anthropogenic carbon dioxide (CO2) emissions over the past century, multiple technologies are being explored to capture this greenhouse gas and utilize it as a viable feedstock. A promising outlet for CO2 is hydrogenation to methanol. Methanol is widely used in the chemical industry, primarily in the production of formaldehyde, methyl-tert-butyl-ether, and acetic acid, as well as an alternative to traditional fuels due to its superior combustion properties. In addition, significant research is ongoing to utilize methanol as an energy carrier for use in fuel cells. Significant research has been done to understand the kinetic performance of Cu/ZnO/Al2O3 catalyst for methanol synthesis, however, much of this research involves lower pressures (
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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