Search results:
Found 46
Listing 1 - 10 of 46 | << page >> |
Sort by
|
Choose an application
The utilisation of the C4 streams of steamcrackers by converting raffinate II to maleic anhydride was studied. The oxidation reactions were investigated in a laboratory-scale fixed-bed reactor to determine reaction kinetics. The effects of pore diffusional resistance were investigated and explained. A two-dimensional pseudo-homogeneous reactor model was used for the simulation of a production-scale fixed-bed reactor. A flow scheme of the reactor section including a recycle was proposed.
Choose an application
The book on Advanced Chemical Kinetics gives insight into different aspects of chemical reactions both at the bulk and nanoscale level and covers topics from basic to high class. This book has been divided into three sections: (i) ""Kinetics Modeling and Mechanism,"" (ii) ""Kinetics of Nanomaterials,"" and (iii) ""Kinetics Techniques."" The first section consists of six chapters with a variety of topics like activation energy and complexity of chemical reactions; the measurement of reaction routes; mathematical modeling analysis and simulation of enzyme kinetics; mechanisms of homogeneous charge compression ignition combustion for the fuels; photophysical processes and photochemical changes; the mechanism of hydroxyl radical, hydrate electron, and hydrogen atom; and acceptorless alcohol dehydrogenation. The understanding of the kinetics of nanomaterials, to bridge the knowledge gap, is presented in the second section. The third section highlights an overview of experimental techniques used to study the mechanism of reactions.
Physical Sciences, Engineering and Technology --- Chemistry --- Physical Chemistry --- Chemical Kinetics
Choose an application
Heterogeneous kinetics plays an important role in many scientific disciplines and industrial branches such as physical chemistry, materials science, chemical industry, ceramic industry, etc. Although many excellent books on theories and methods can be found, the aim of this book is to provide an unconventional insight into the heterogeneous kinetics and properties of the activated complex. The introduction of the effective mass of this instanton enables to calculate many other properties, such as the most probable speed of activated complex, the momentum, the energetic density, the mass flux, etc., and to define two quantum numbers of activated state, i.e., the activation energy and the momentum. The monograph is organized into three chapters. The first of them deals with a short historical background, which introduces the beginning of chemical kinetics in the historical context. The second chapter is dedicated to the transition state theory, and the third one explains the concept of effective mass and effective rate of activated state as well as other properties of activated complex.
Physical Sciences, Engineering and Technology --- Chemistry --- Physical Chemistry --- Chemical Kinetics
Choose an application
In the modern world of ever-advancing technologies, actual tests of products and processes are more and more often preceded, if not replaced, by computer modeling. This saves the time and resources required for actual tests, and enables a better understanding of processes that occur in the course of tests. Preliminary computer modeling favors prudent planning of experiments. Calculations in thermal analysis are used everywhere, for example, in estimating the efficiency of thermal insulation of pipelines and in estimating the critical overheating conditions for some chemical substances under which their decomposition, self-heating, explosion, and so forth, occurs. This methodical manual focuses on a small aspect of calculations in thermal analysis dealing with constructing kinetic models from thermogravimetry and differential scanning calorimetry experimental data.
MPRL --- Edition Open Access --- thermal analysis --- differential scanning calorimetry --- thermogravimetry --- non-isothermal kinetics
Choose an application
The emission of dibenzofurans and dioxins from industrial processes is a major environmental concern. Focussing on dibenzofuran, this study tend to improve our understanding of the general oxidation chemistry and to provide a mechanism suitable for future modelling studies.Based on quantum chemical methods, energies, chemical structures and reactions are calculated numerically. Not only stable molecules and radicals, but also transition states are reported in this work.
Choose an application
Biosensors are devices that utilize biological recognition elements to selectively detect and analyze specific biological and chemical analyte substances. In this work a technology platform for label-free optical biosensors based on surface-functionalized photonic crystal slabs is proposed. Using this technology platform, low-cost solutions for three biotechnical questions are presented.
Choose an application
The present work covers fundamental issues such as OME synthesis and properties up to process development and optimization for oxymethylene ethers (OME) production. This innovative diesel fuel can be produced from renewable raw materials. Compared to conventional diesel, OME leads to a significant reduction of nitrogen oxides and soot formation.
Choose an application
Catalyst deactivation, the loss over time of catalytic activity and/or selectivity, is a problem of great and continuing concern in the practice of industrial catalytic processes. Costs to industry for catalyst replacement and process shutdown total tens of billions of dollars per year. While catalyst deactivation is inevitable for most processes, some of its immediate, drastic consequences may be avoided, postponed, or even reversed. Accordingly, there is considerable motivation to better understand catalyst decay and regeneration. Indeed, the science of catalyst deactivation and regeneration has been developing rapidly as evidenced by the considerable literature addressing this topic, including 21,000 journal articles, presentations, reports, reviews, and books; and more than 29,000 patents for the period of 1980 to 2012. This developing science provides the foundation for continuing, substantial improvements in the efficiency and economics of catalytic processes through development of catalyst deactivation models, more stable catalysts, and regeneration processes.This special issue focuses on recent advances in catalyst deactivation and regeneration, including advances in (1) scientific understanding of mechanisms; (2) development of improved methods and tools for investigation; and (3) more robust models of deactivation and regeneration.
Choose an application
Kinetics and reactor modeling for heterogeneous catalytic reactions are prominent tools for investigating and understanding catalyst functionalities at nanoscale and the related rates of complex reaction networks. This book illustrates some examples related to the transformation of simple to more complex feedstocks, including different types of reactor designs, i.e., steady-state, transient plug flow reactors, and TAP reactors for which there is sometimes a strong gap in the operating conditions from ultra-high-vacuum to high-pressure conditions. In conjunction, new methodologies have emerged, giving rise to more robust microkinetics models. As exemplified, they include the kinetics and the dynamics of the reactors and span a large range of length and time scales. The objective of this Special Issue is to provide contributions that can illustrate recent advances and novel methodologies for elucidating the kinetics of heterogeneous reactions and the necessary multiscale approach for optimizing the reactor design. This book is dedicated to postgraduate and scientific researchers, and experts in heterogeneous catalysis. It may also serve as a source of original information for the elaboration of lessons on catalysis for Master students.
2,3-Butanediol dehydration --- 1,3-Butadiene --- Methyl Ethyl Ketone --- amorphous calcium phosphate --- reactor modeling --- pilot-scale fixed-bed reactor --- gas-phase oxidation --- HNO3 --- hierarchical graphite felts --- selective oxidation --- H2S --- heats of adsorption --- FTIR spectroscopy --- AEIR method --- Temkin model --- kinetics --- kinetic model --- microkinetics --- cracking --- methanol-to-olefins (MTO) --- zeolite --- ZSM-5 --- ZSM-23 --- SAPO-18 --- SAPO-34 --- transient kinetics --- TAP reactor --- temporal analysis of products --- ammonia decomposition --- internal effectiveness factor --- effective diffusion coefficient --- N2O --- catalytic decomposition --- cobalt mixed oxide --- alkali metal --- promoter --- power-law --- Langmuir–Hinshelwood --- kinetic modeling --- Pd/?-Al2O3 --- catalytic combustion --- automation --- digitalization --- mechanism analysis --- rhodium --- methane --- n/a
Choose an application
The Tsinghua University–University of Waterloo Joint Research Center for Micro/Nano Energy & Environment Technology (JCMEET) is a platform. It was established on Nov.11, 2017. The Chairperson of University Council of Tsinghua University, Dr. Xu Chen, and the President of the University of Waterloo, Dr. Feridun Hamdullahpur, attended the opening ceremony and unveiled the nameplate for the joint research center on 29th of March, 2018. The research center serves as a platform for researchers at both universities to conduct joint research in the targeted areas, and to meet regularly for information exchange, talent exchange, and knowledge mobilization, especially in the fields of micro/nano, energy, and environmental technologies. The center focuses on three main interests: micro/nano energy technology, micro/nano pollution control technology, and relevant fundamental research. In order to celebrate the first anniversary of the Joint Research Center, we were invited to serve as the Guest Editors of this Special Issue of Materials focusing on the topic of micro/nano-materials for clean energy and environment. It collects research papers from a broad range of topics related to micro/nanostructured materials aimed at future energy resources, low emission energy conversion, energy storage, energy efficiency improvement, air emission control, air monitoring, air cleaning, and many other related applications. This Special Issue provides an opportunity and example for the international community to discuss how to actively address the energy and environment issues that we are facing.
air filtration --- airborne nanoparticle --- particle concentration --- nanofibers --- cellulose nanofiber --- Lyocell fiber --- PM2.5 --- filter paper --- submicro-fiber --- airborne dust --- engine filtration --- loading performance --- potassium-based adsorbent --- load modification --- CO2 adsorption --- failure --- kinetics --- microscopic characteristics --- CaO --- As2O3 --- DFT --- adsorption --- oxygen carrier --- multiscale model --- product island --- oxidation kinetics --- thermal energy storage (TES) --- phase change material (PCM) --- building materials --- passive building systems --- mortar --- concrete --- flame synthesis --- flame stabilizing on a rotating surface (FSRS) --- rotational speed --- particle deposition --- Karlovitz number --- Limestone --- particle size --- sulfation --- TGA --- model --- nanoparticles --- nanoplates --- spectral blue shift --- amalgam --- water quality --- shale --- permeability measurement --- pressure decay method
Listing 1 - 10 of 46 | << page >> |
Sort by
|