Relevant bibliographies by topics / Langmuir-Hinshelwood equation / Journal articles
To see the other types of publications on this topic, follow the link: Langmuir-Hinshelwood equation.

Journal articles on the topic 'Langmuir-Hinshelwood equation'

Author: Grafiati
Published: 26 June 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Langmuir-Hinshelwood equation.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Słomkiewicz, Piotr M. "Determination of the Langmuir–Hinshelwood kinetic equation of synthesis of ethers." Applied Catalysis A: General 269, no. 1-2 (2004): 33–42. http://dx.doi.org/10.1016/j.apcata.2004.03.055.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Net, S., L. Nieto-Gligorovski, S. Gligorovski, and H. Wortham. "Heterogeneous ozonation kinetics of 4-phenoxyphenol in presence of photosensitizer." Atmospheric Chemistry and Physics Discussions 9, no. 5 (2009): 21647–68. http://dx.doi.org/10.5194/acpd-9-21647-2009.

Full text
Abstract:
Abstract. In this work we have quantitatively measured the degradation of 4-phenoxyphenol adsorbed on silica particles following oxidative processing by gas-phase ozone. This was performed under dark conditions and in presence of 4-carboxybenzophenone under simulated sunlight irradiation of the particles surface. At mixing ratio of 60 ppb which corresponds to strongly ozone polluted areas, the first order decay of 4-phenoxyphenol is k1=9.95×10−6 s−1. At very high ozone mixing ratio of 6 ppm the first order rate constants for 4-phenoxyphenol degradation were the following: k1=2.86×10−5 s−1 unde
APA, Harvard, Vancouver, ISO, and other styles
3

Net, S., L. Nieto-Gligorovski, S. Gligorovski, and H. Wortham. "Heterogeneous ozonation kinetics of 4-phenoxyphenol in the presence of photosensitizer." Atmospheric Chemistry and Physics 10, no. 4 (2010): 1545–54. http://dx.doi.org/10.5194/acp-10-1545-2010.

Full text
Abstract:
Abstract. In this work we have quantitatively measured the degradation of 4-phenoxyphenol adsorbed on silica particles following oxidative processing by gas-phase ozone. This was performed under dark conditions and in the presence of 4-carboxybenzophenone under simulated sunlight irradiation of the particles surface. At the mixing ratio of 60 ppb which corresponds to strongly polluted ozone areas, the first order of decay of 4-phenoxyphenol is k1=9.95×10−6 s−1. At a very high ozone mixing ratio of 6 ppm the first order rate constants for 4-phenoxyphenol degradation were the following: k1=2.86×
APA, Harvard, Vancouver, ISO, and other styles
4

Hejtmánková, Alena, Karel Jeřábek, and Karel Setínek. "Kinetics of methyl tert. butyl ether synthesis in gaseous phase." Collection of Czechoslovak Chemical Communications 55, no. 4 (1990): 1033–37. http://dx.doi.org/10.1135/cccc19901033.

Full text
Abstract:
Kinetics of methyl tert.butyl ether synthesis from methanol and isobutene was measured in gaseous phase at 85 °C and atmospheric pressure on macroreticular ion exchanger catalyst containing strongly acidic functional groups SO3H and on the same catalyst partially neutralized by sodium and iron ions. The form of the best Langmuir-Hinshelwood type kinetic equation suggests absorption of the reactants in the polymer mass causing ìswellingî of it and influencing the accessibility of active sites by the reactants. Neutralization of the catalyst by metal ions suppresses this effect.
APA, Harvard, Vancouver, ISO, and other styles
5

Bandyopadhyay, Debajyoti, and Ahindra Ghosh. "Validity of rate equation based on Langmuir-Hinshelwood mechanism for gasification of carbon - a reappraisal." Steel Research 67, no. 3 (1996): 79–86. http://dx.doi.org/10.1002/srin.199605462.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Urmès, Caroline, Jean-Marc Schweitzer, Amandine Cabiac, and Yves Schuurman. "Kinetic Study of the Selective Hydrogenation of Acetylene over Supported Palladium under Tail-End Conditions." Catalysts 9, no. 2 (2019): 180. http://dx.doi.org/10.3390/catal9020180.

Full text
Abstract:
The kinetics of the selective hydrogenation of acetylene in the presence of an excess of ethylene has been studied over a 0.05 wt. % Pd/α-Al2O3 catalyst. The experimental reaction conditions were chosen to operate under intrinsic kinetic conditions, free from heat and mass transfer limitations. The data could be described adequately by a Langmuir–Hinshelwood rate-equation based on a series of sequential hydrogen additions according to the Horiuti–Polanyi mechanism. The mechanism involves a single active site on which both the conversion of acetylene and ethylene take place.
APA, Harvard, Vancouver, ISO, and other styles
7

Xu, Huan Yan, Xue Li, Yan Li, Ping Li, and Wei Chao Liu. "Photocatalytic Degradation of Methyl Orange by TiO2/Schorl Photocatalyst: Kinetics and Thermodynamics." Applied Mechanics and Materials 713-715 (January 2015): 2789–92. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.2789.

Full text
Abstract:
An active dye, Methyl Orange (MO) was employed as the target pollutant to evaluate the photocatalytic activity of TiO2/schorl composite and the kinetics and thermodynamics of this process was emphasized in this work. Langmuir–Hinshelwood kinetic model was employed for the kinetic studies and the results revealed that the process of MO photocatalytic discoloration by TiO2/schorl composite followed one order reaction kinetic equation under different conditions. The reaction rate constant (k) increased with initial MO concentration decreasing. When the catalyst dosage or solution pH increased,kva
APA, Harvard, Vancouver, ISO, and other styles
8

Frontistis, Z., M. Papadaki, and D. Mantzavinos. "Modelling of sonochemical processes in water treatment." Water Science and Technology 55, no. 12 (2007): 47–52. http://dx.doi.org/10.2166/wst.2007.376.

Full text
Abstract:
The mechanisms and kinetics of the sonochemical degradation of organic molecules in water are relatively complex since several parameters such as physicochemical properties, substrate concentration, water matrix, reactor geometry, ultrasound properties (frequency, power, emission system) all typically affect the process. In this work, simple kinetic models were used to predict the degradation of 2-chlorophenol and sodium dodecylbenzene sulphonate in aqueous solutions and verified against experimental data taken from previous studies. A pseudo-first order kinetic expression can adequately descr
APA, Harvard, Vancouver, ISO, and other styles
9

Du, Qingyang, Huijun Xu, Zhihao Yu, et al. "Study on the Preparation of Zn-Doped NaA Molecular Sieve and Its Photocatalytic Performance." Journal of Physics: Conference Series 2168, no. 1 (2022): 012026. http://dx.doi.org/10.1088/1742-6596/2168/1/012026.

Full text
Abstract:
Abstract Zn-doped NaA molecular sieves were prepared by hydrothermal method using zinc nitrate, sodium metaaluminate, silica sol, etc. as raw materials. The samples were characterized by XRD, SEM, FT-IR, etc., using 300W xenon lamp as the light source. Rhodamine B (RhB) was used as the target degradant for photocatalytic experiments for its photocatalytic activity. The results showed that zinc ion doping increased the number of active sites on the NaA molecular sieve, effectively reduced the photoelectron-hole recombination probability in the molecular sieve, and improved the photocatalytic ac
APA, Harvard, Vancouver, ISO, and other styles
10

Lozano-Morales, S., Graciela Morales, Miguel López Zavala, Augusto Arce-Sarria, and Fiderman Machuca-Martínez. "Photocatalytic Treatment of Paracetamol Using TiO2 Nanotubes: Effect of pH." Processes 7, no. 6 (2019): 319. http://dx.doi.org/10.3390/pr7060319.

Full text
Abstract:
Pharmaceuticals are considered among the group of emerging contaminants. Paracetamol is a moderate painkiller, which has been detected in ground and surface water. Photodegradation of paracetamol at a wavelength of radiation of 254 nm with TiO2 nanotubes was studied by UV-spectroscopy, HPLC and measurement of the potential zeta in dependence of the solution pH. The efficiency of the photodegradation of paracetamol (20 mg L−1) was 99% after 100 min exposure. Application of the Langmuir-Hinshelwood equation allowed the evaluation of the rate constant. Non-organic by-products were detected under
APA, Harvard, Vancouver, ISO, and other styles
11

Orudzhev, Farid F., F. G. Gasanova, A. B. Isaev, and N. S. Shabanov. "Influence of Oxygen Pressure to Photocatalytic Oxidation of Phenol on CuO/TiO2." Materials Science Forum 855 (May 2016): 139–46. http://dx.doi.org/10.4028/www.scientific.net/msf.855.139.

Full text
Abstract:
The photocatalytic oxidation of phenol on the composite copper oxide (II) modified titania photocatalyst (CuO/TiO2) with sunlight irradiation at high oxygen pressure are studied. The photocatalyst characterized by Scanning electron microscopy (SEM), UV-Visible Diffuse Reflectance spectroscopy (UV-DRS), Surface area analysis, and X-ray diffractometry (XRD). The composite photocatalyst based on the anatase includes 3% copper oxide (II). The CuO/TiO2 photocatalytic activity was investigated of phenol oxidation with sunlight irradiation at high oxygen pressure. The photocatalytic oxidation of phen
APA, Harvard, Vancouver, ISO, and other styles
12

Sheidaei, Behnaz, and Mohammad A. Behnajady. "Mathematical Kinetic Modelling and Representing Design Equation for a Packed Photoreactor with Immobilised TiO2-P25 Nanoparticles on Glass Beads in the Removal of C.I. Acid Orange 7." Chemical and Process Engineering 36, no. 2 (2015): 125–33. http://dx.doi.org/10.1515/cpe-2015-0010.

Full text
Abstract:
In this work, a design equation was presented for a batch-recirculated photoreactor composed of a packed bed reactor (PBR) with immobilised TiO2-P25 nanoparticle thin films on glass beads, and a continuous-flow stirred tank (CFST). The photoreactor was studied in order to remove C.I. Acid Orange 7 (AO7), a monoazo anionic dye from textile industry, by means of UV/TiO2 process. The effect of different operational parameters such as the initial concentration of contaminant, the volume of solution in CFST, the volumetric flow rate of liquid, and the power of light source in the removal efficiency
APA, Harvard, Vancouver, ISO, and other styles
13

Nuryono, Nuryono, V. V. H. Susanti, and Narsito Narsito. "KINETIC STUDY ON ADSORPTION OF CHROMIUM(lIl) TO DIATOMACEOUS EARTH PRE-TREATED WITH SULFURIC AND HYDROCHLORIC ACIDS." Indonesian Journal of Chemistry 3, no. 1 (2010): 32–38. http://dx.doi.org/10.22146/ijc.21903.

Full text
Abstract:
In this research, the effect of Sangiran diatomaceous earth pre-treatment with sulfuric acid (H2SO4) and hydrochloric acid (HCl) on the kinetics of adsorption for Cr(III) in aqueous solution has been studied. The research has been carried out by mixing an amount of diatomeaeous earth with HCl or H2SO4 in various concentrations for two hours at temperature of 150 - 200°C. The mixture was washed with water until neutral, and the residue was dried at 70°C for four hours. The result then was used as adsorbent. Adsorption was carried out by mixing an amount of adsorbent with Cr(III) solution in var
APA, Harvard, Vancouver, ISO, and other styles
14

Jia, Ruo Kun, Yang Yu, Song Zhu Lin, and Na Bai. "Kinetics of TiO2/Polyurethane Films for Degradation of Organic Pollutants in Water." Advanced Materials Research 610-613 (December 2012): 1560–64. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.1560.

Full text
Abstract:
In this paper,TiO2was prepared by the sol-gel Method,which has high activity and oxidation abilities .The polyurethane is famous for its transmittance and film forming properties,we use polyurethane and titanium dioxide to produce TiO2/polyurethane films. In this paper, phenolic wastewater was considered as the research object,Discussed photocatalytic properties and photocatalytic reaction kinetics model of TiO2/polyurethane film at 253.7nm UV irradiation.The results show that degradation rate of phenolic wastewater approached to 14.6mg.L-1.h-1.m2-1 when Ti02dosage of 60 mg/L,reaction time of
APA, Harvard, Vancouver, ISO, and other styles
15

Li, Jian, Tuqiao Zhang та Miaomiao Ye. "Heterogeneous oxidation of diclofenac in the presence of α-MnO2 nanorods: influence of operating factors and mechanism". Water Science and Technology 71, № 9 (2015): 1340–46. http://dx.doi.org/10.2166/wst.2015.068.

Full text
Abstract:
Diclofenac (DCF), one of the pharmaceutical and personal care products that has been widely detected in water, was selected as a model pollutant to evaluate the oxidation activity of α-MnO2 nanorods. The results showed that the heterogeneous oxidation process is highly pH dependent, with higher degradation efficiency at lower pH values. The complete removal of DCF was obtained within 80 min at the solution pH value of 2.5. The oxidation kinetics of DCF can be modeled by Langmuir–Hinshelwood equation (R2 > 0.999). The effects of various operating parameters, including initial solution pH
APA, Harvard, Vancouver, ISO, and other styles
16

Jiaying, Zhang. "Kinetic study of carbon monoxide methanation over mesoporous Ni-Mo catalyst prepared by a hydrothermal method." Progress in Reaction Kinetics and Mechanism 44, no. 1 (2019): 3–17. http://dx.doi.org/10.1177/1468678319825692.

Full text
Abstract:
The kinetics of carbon monoxide methanation over Ni-Mo-SiO2 catalyst were studied. The model was developed based on catalyst tests carried out in a fixed-bed reactor at a reaction temperature varied from 300 °C to 450 °C under a pressure from 0.1 to 1.5 MPa with a weight hourly space velocity of 60,000 mL h−1 g−1. An orthogonal design method was adopted to select test points with temperature, pressure, and feed compositions as factors. Based on the experimental observations, a Langmuir–Hinshelwood equation kinetic model was formulated and its parameters were estimated by fitting the experiment
APA, Harvard, Vancouver, ISO, and other styles
17

Behnajady, Mohammad A., Sadegh Amirmohammadi-Sorkhabi, Nasser Modirshahla, and Mohammad Shokri. "Investigation of the efficiency of a tubular continuous-flow photoreactor with supported titanium dioxide nanoparticles in the removal of 4-nitrophenol: operational parameters, kinetics analysis and mineralization studies." Water Science and Technology 64, no. 1 (2011): 56–62. http://dx.doi.org/10.2166/wst.2011.666.

Full text
Abstract:
In this study, to investigate the application of heterogeneous photocatalysis in the removal of organic contaminants from aqueous media a novel tubular continuous-flow photoreactor with supported TiO2-P25 on glass plates was designed and constructed. The photoreactor comprises six quartz tubes and a UV lamp which was placed in the center of the quartz tubes. 4-nitrophenol (4-NP) as a most refractory pollutant was chosen as a probe pollutant to examine the photoreactor efficiency for environmental cleaning applications. Results of experiments show that the removal efficiency of 4-NP in this pho
APA, Harvard, Vancouver, ISO, and other styles
18

Constantin, Mirela Alina, Florentina Laura Chiriac, Stefania Gheorghe, and Lucian Alexandru Constantin. "Degradation of Carbamazepine from Aqueous Solutions via TiO2-Assisted Photo Catalyze." Toxics 10, no. 4 (2022): 168. http://dx.doi.org/10.3390/toxics10040168.

Full text
Abstract:
Photocatalytic degradation of carbamazepine (CBZ) from spiked aqueous solutions, via a UV/TiO2 system, was investigated, and the optimum photocatalyst type (P25 Degussa) and dose (500 mg/L), as well as irradiation time (45 min), were established. The degradation process kinetics was studied, and a degradation rate constant of 3.14 × 10−5 M min−1 was calculated for CBZ, using the Langmuir–Hinshelwood equation. Experiments performed in the presence of scavengers showed that the main reactive species involved in the degradation process are holes and free hydroxyl radicals; superoxide radicals als
APA, Harvard, Vancouver, ISO, and other styles
19

Zhong, Junbo, Hong Zhao, Di Ma, et al. "RETRACTED ARTICLE: Kinetic and anion degradation products study on photocatalytic degradation of reactive orange 5 solution with phosphotungstic acid." Open Chemistry 6, no. 1 (2008): 99–105. http://dx.doi.org/10.2478/s11532-007-0064-2.

Full text
Abstract:
AbstractIncreasing environmental pollution caused by toxic dyes is a matter of great concern due to their hazardous nature. So it is crucial to develop processes which can destroy these dyes effectively. It has been generally agreed that reactive orange 5 (KGN) can be effectively degraded in aerated phosphotungstic acid (HPA) in a homogeneous reaction system using near-UV irradiation. In this paper, photocatalytic degradation of reactive orange 5 solutions with phosphotungstic acid was investigated, especially more attention was paid to the kinetic model and the anion degradation products. The
APA, Harvard, Vancouver, ISO, and other styles
20

Chan, A. H. C., J. F. Porter, J. P. Barford, and C. K. Chan. "Photocatalytic thin film cascade reactor for treatment of organic compounds in wastewater." Water Science and Technology 44, no. 5 (2001): 187–95. http://dx.doi.org/10.2166/wst.2001.0283.

Full text
Abstract:
The photocatalytic oxidation of benzoic acid was investigated in a pilot scale-cascade photoreactor. The photoreactor consists of an array of UV lamps (40 W, 365 nm) illuminating a cascade of three inclined 316 stainless steel plates, on which titanium dioxide (TiO2) was immobilized by electrophoretic deposition. The percentage removal of total organic carbon (TOC) of liquid samples was determined. The photocatalytic process was affected by several operating parameters. Increasing the solution temperature was found to reduce the dissolved oxygen (DO) level and to decrease the rate of the degra
APA, Harvard, Vancouver, ISO, and other styles
21

Alejandro-Martín, Serguei, Héctor Valdés, and Claudio A. Zaror. "Catalytic Ozonation of Toluene over Acidic Surface Transformed Natural Zeolite: A Dual-Site Reaction Mechanism and Kinetic Approach." Catalysts 11, no. 8 (2021): 958. http://dx.doi.org/10.3390/catal11080958.

Full text
Abstract:
Volatile organic compounds (VOCs) are responsible for damage to health due to their carcinogenic effects. Catalytic ozonation using zeolite appears as a valuable process to eliminate VOCs from industrial emissions at room temperature. For full-scale application of this new abatement technology, an intrinsic reaction rate equation is needed for an effective process design and scale-up. Results obtained here provide a mechanistic approach during the initial stage of catalytic ozonation of toluene using an acidic surface transformed natural zeolite. In particular, the contribution of Lewis and Br
APA, Harvard, Vancouver, ISO, and other styles
22

Ryzha, Iryna. "Modeling of carbon monoxide oxidation on the catalytic surface in the two-dimensional case." Physico-mathematical modelling and informational technologies, no. 26 (December 30, 2017): 83–89. http://dx.doi.org/10.15407/fmmit2017.26.083.

Full text
Abstract:
A two-dimensional model of carbon monoxide (CO) catalytic oxidation on a platinum (Pt) surface for the Langmuir-Hinshelwood mechanism is investigated. The adsorbate-driven (1×1)-(1×2) structural phase transition of Pt(110) and the formation of new crystal planes on the catalytic surface (faceting) as well as the effect of the substrate temperature are taken into account. It is shown that the stability region for CO oxidation reaction changes when two dimensions are taken into account. Similarly to the one-dimensional case, the reaction of CO oxidation on Pt-catalyst surface is periodic in the
APA, Harvard, Vancouver, ISO, and other styles
23

Gulková, Daniela, and Miloš Kraus. "Dehydrogenation of Substituted Alcohols to Aldehydes on Zinc Oxide-Chromium Oxide Catalysts." Collection of Czechoslovak Chemical Communications 57, no. 11 (1992): 2215–26. http://dx.doi.org/10.1135/cccc19922215.

Full text
Abstract:
Sixteen primary alcohols of the structure RCH2OH (R = CH3, C2H5, (CH3)2CH, (CH3)3CCH2, HOCH2, CH3OCH2, C6H5, C6H5CH2, C6H5OCH2, ClCH2, BrCH2, F3C, CNCH2, (CH3)2NCH2, (C2H5)2NCH2 and tetrahydrofurfuryl) were explored for the possibility of obtaining the corresponding aldehydes by dehydrogenation on solid catalysts. Various catalysts were tested and two zinc oxide-chromium oxide catalysts were selected for further work because their activity and selectivity was satisfactory; moreover, the selectivity could be improved by addition of sodium into the catalysts and of water into the feed. The react
APA, Harvard, Vancouver, ISO, and other styles
24

Ghosh, Malini, Pankaj Chowdhury, and Ajay K. Ray. "Photocatalytic Activity of Aeroxide TiO2 Sensitized by Natural Dye Extracted from Mangosteen Peel." Catalysts 10, no. 8 (2020): 917. http://dx.doi.org/10.3390/catal10080917.

Full text
Abstract:
Natural dye sensitizers are environment-friendly and inexpensive substances that could be used for photocatalytic decontamination of organic pollutants. In this study, a natural dye extracted from mangosteen peel, containing a significant amount of anthocyanin dye, has been successfully employed to sensitize aeroxide TiO2 to lower its bandgap, thereby making the process visible sunlight-driven. We have demonstrated the photocatalytic activity of mangosteen dye-sensitized-TiO2 (MS-TiO2) under visible solar light by studying the degradation of methylene blue (MB), a well-studied model compound.
APA, Harvard, Vancouver, ISO, and other styles
25

Sadr Manuchehri, Qazale, Navid Assi, Sanaz Pourmand, Maher Darwish, and Amir Pakzad. "Photocatalytic Activity of ZnO Nanoparticles Prepared by a Microwave Method in Ethylene Glycol and Polyethylene Glycol Media: A Comparative Study." Journal of Nano Research 42 (July 2016): 53–64. http://dx.doi.org/10.4028/www.scientific.net/jnanor.42.53.

Full text
Abstract:
Zinc oxide nanoparticles have been synthesized by a sol-gel microwave assisted method using either ethylene glycol (ZnO-EG) or poly ethylene glycol ethanolic solution (ZnO-PEG) as dispersing media. The nanoparticles were characterized by X-ray diffraction, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, and Fourier transform infrared. X-ray analysis revealed a hexagonal phase structure of both zinc oxides. The average crystallite size calculated from Scherrer equation was 27 nm and 53 nm in good agreement with 24 nm and 55 nm microscopic results for ZnO-EG an
APA, Harvard, Vancouver, ISO, and other styles
26

Ling, Chin Mei, Abdul Rahman Mohamed, and Subhash Bhatia. "Photodegradation Kinetics of Phenol and Methylene Blue Dye Present in Water Stream Over Immobilized Film Ti02 Catalyst." ASEAN Journal of Chemical Engineering 5, no. 2 (2005): 131. http://dx.doi.org/10.22146/ajche.50181.

Full text
Abstract:
A photocatalytic reactor has been designed to study the kinetics of photocatalytic degradation of phenol and methylene blue dye present in water stream on immobilized Ti02 catalyst. The principal part of the reactor consisted of a cylindrical pyrex glass tube whose outer surface was coated with the synthetic Ti02 film catalyst prepared from sol-gel technique. An ultraviolet light lamp of 365 nm wavelength was set longitudinally in the center of the tube. The synthetic Ti02 film formulation with the molar ratio of 1 titanium isopropoxide : 8 isopropanol: 1.1 H20: 3 acetyl acetone: 0.05 acetic a
APA, Harvard, Vancouver, ISO, and other styles
27

Zhang, Jia Ying. "Intrinsic Kinetics Study of CO Methanation on Ni-Mo-SiO2 Catalyst Prepared by Hydrothermal Method." Materials Science Forum 921 (May 2018): 40–47. http://dx.doi.org/10.4028/www.scientific.net/msf.921.40.

Full text
Abstract:
A comprehensive kinetic model for methanation of syngas on Ni-Mo-SiO2catalyst was developed on a fixed bed reactor data. The CO and H2conversion, methane selectivity and yield were obtained in a wide range of operating conditions including 300 < T < 450°C, 1 < H2/CO <4 and 0.1 < P < 1.5 MPa with the total weight hourly space velocity (WHSV) of 60000 ml/h/g. A 6-step reaction scheme defined to the description of a reaction network that considers both catalytic and gas-phase as well as primary and consecutive reaction steps to predict the performance of the syngas methantion. O
APA, Harvard, Vancouver, ISO, and other styles
28

Zhang, Li Shan, Teng Fa Long, Chang Qi Yan, Xing Cun He, Meng Lin Cheng, and Shan Zhong. "Synthesis of AgCl/BiOCl Composite Photocatalyst and its Photocatalytic Activity under Visible-Light Irradiation." Advanced Materials Research 662 (February 2013): 372–78. http://dx.doi.org/10.4028/www.scientific.net/amr.662.372.

Full text
Abstract:
A series of BiOCl photocatalysts with different AgCl contents have been synthesized by a simple hydrolysis method at room temperature using BiCl3 and Bi(NO3)3•5H2O as the main raw materials. The resulting products were characterized with X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and UV‐vis diffuse reflectance spectra (DRS). The photocatalytic activities of these AgCl/BiOCl composites were evaluated by the degradation of rhodamine B (RhB) under UV and visible light. The results revealed that the BiOCl/AgCl with an initial 100:1 mole ratio of Bi to Ag have the highest ph
APA, Harvard, Vancouver, ISO, and other styles
29

Demircivi, Pelin, and Esra Bilgin Simsek. "Fabrication of Zr-doped TiO2/chitosan composite catalysts with enhanced visible-light-mediated photoactivity for the degradation of Orange II dye." Water Science and Technology 78, no. 3 (2018): 487–95. http://dx.doi.org/10.2166/wst.2018.298.

Full text
Abstract:
Abstract Zirconium/titanium/chitosan (Zr/Ti/CHT) composite catalysts were synthesized by sol-gel method using different chitosan amounts (5–20 wt.%) and their activity in the photocatalytic degradation of Orange II dye was evaluated for the first time. The results were compared with Zr/Ti, Zr/CHT and Ti/CHT catalysts. The composite catalysts were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy, scanning electron microscopy and X-ray photoelectron spectroscopy analysis. XRD analysis revealed that the Zr/Ti/CHT composite catalyst showed high crystallinity of ana
APA, Harvard, Vancouver, ISO, and other styles
30

Mehrizad, Ali, and Parvin Gharbani. "Optimization of operational variables and kinetic modeling for photocatalytic removal of Direct Blue 14 from aqueous media by ZnS nanoparticles." Journal of Water and Health 15, no. 6 (2017): 955–65. http://dx.doi.org/10.2166/wh.2017.269.

Full text
Abstract:
Abstract Zinc sulfide nanoparticles (ZnS-NPs) were synthesized via a simple and facile co-precipitation method and were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and diffuse reflectance spectroscopy (DRS). Photocatalytic activity of synthesized nanoparticles was evaluated in removal of double azo dye Direct Blue 14 (DB14) from aqueous media. Optimization of photocatalytic removal of DB14 was studied using response surface methodology (RSM). Based on the results, DB14 removal efficiency increased with increasing intensity and duration of UV l
APA, Harvard, Vancouver, ISO, and other styles
31

Tao, Ran. "Humic Acids Degradation and Membrane Fouling in Photocatalytic MF Systems for Drinking Water Treatment." Advanced Materials Research 800 (September 2013): 573–75. http://dx.doi.org/10.4028/www.scientific.net/amr.800.573.

Full text
Abstract:
Humic acids (HA) that are one of the major organic components in natural water play an important role in water treatment because they can interact with metals, trace organics, and chlorine while generating toxic complexes and by-products. In this work, photocatalytic degradation of HA and its kinetic behavior were investigated in a photocatalytic microfiltration (MF) system, along with evaluation of membrane permeability at different fluxes. The mechanisms of adsorption and desorption of HA on TiO2 surfaces were elucidated with adsorption isotherm tests of HA before and after photocatalysis of
APA, Harvard, Vancouver, ISO, and other styles
32

Wiederkehr, Bruna, David Alexander Mitchell, Luiz Fernando de Lima Luz, and Nadia Krieger. "Use of the Langmuir-Hinshelwood-Hougen-Watson equation to describe the ethyl esterification of fatty acids catalyzed by a fermented solid with lipase activity." Biochemical Engineering Journal 168 (April 2021): 107936. http://dx.doi.org/10.1016/j.bej.2021.107936.

Full text
APA, Harvard, Vancouver, ISO, and other styles
33

Lin, Xiao, Ming Li, Youji Li, and Wei Chen. "Enhancement of the catalytic activity of ordered mesoporous TiO2 by using carbon fiber support and appropriate evaluation of synergy between surface adsorption and photocatalysis by Langmuir–Hinshelwood (L–H) integration equation." RSC Advances 5, no. 127 (2015): 105227–38. http://dx.doi.org/10.1039/c5ra21083f.

Full text
APA, Harvard, Vancouver, ISO, and other styles
34

Zouaghi, Razika, Abdennour Zertal, Bernard David, and Sylvie Guittonneau. "Photocatalytic Degradation of Monolinuron and Linuron in an Aqueous Suspension of Titanium Dioxide Under Simulated Solar Irradiation." Revue des sciences de l'eau 20, no. 2 (2007): 163–72. http://dx.doi.org/10.7202/015810ar.

Full text
Abstract:
Abstract The photocatalytic degradation of two phenylurea herbicides, monolinuron (MLN) and linuron (LN), was investigated in an aqueous suspension of TiO2 using simulated solar irradiation. The objective of the study was to compare their photocatalytic reactivity and to assess the influence of various parameters such as initial pesticide concentration, catalyst concentration and photonic flux on the photocatalytic degradation rate of MLN and LN. A comparative study of the photocatalytic degradation kinetics of both herbicides showed that these two compounds have a comparable reactivity with T
APA, Harvard, Vancouver, ISO, and other styles
35

Raillard, C., V. Héquet, P. Le Cloirec, and J. Legrand. "Photocatalytic oxidation of methyl ethyl ketone over sol-gel and commercial TiO2 for the improvement of indoor air." Water Science and Technology 53, no. 11 (2006): 107–15. http://dx.doi.org/10.2166/wst.2006.343.

Full text
Abstract:
This work focuses on the photocatalytic oxidation of gaseous methyl ethyl ketone chosen as a typical indoor air pollutant. Two types of TiO2 coatings were prepared and deposited on glass plates: one using the commercial Degussa P25 TiO2 and the other one by sol-gel method. The first objective of this study was to compare different ways of preparing thin films of sol-gel TiO2 coated on glass plates, taking into account their general aspect and their photocatalytic efficiency. Several parameters were tested, such as the stabilising agent, the glass type of the support, the number of coatings and
APA, Harvard, Vancouver, ISO, and other styles
36

Wang, Shang, Zhaolian Han, Tingting Di, Rui Li, Siyuan Liu, and Zhiqiang Cheng. "Preparation of pod-shaped TiO 2 and Ag@TiO 2 nano burst tubes and their photocatalytic activity." Royal Society Open Science 6, no. 9 (2019): 191019. http://dx.doi.org/10.1098/rsos.191019.

Full text
Abstract:
The pod-shaped TiO 2 nano burst tubes (TiO 2 NBTs) were prepared by the combination of electrospinning and impregnation calcination with oxalic acid (H 2 C 2 O 4 ), polystyrene (PS) and tetrabutyl titanate. The silver nanoparticles (AgNPs) were loaded onto the surface of TiO 2 NBTs by ultraviolet light reduction method to prepare pod-shaped Ag@TiO 2 NBTs. In this work, we analysed the effect of the amount of oxalic acid on the cracking degree of TiO 2 NBTs; the effect of the concentration of AgNO 3 solution on the particle size and loading of AgNPs on the surface of TiO 2 NBTs. Scanning electr
APA, Harvard, Vancouver, ISO, and other styles
37

Bouzek, Karel, and Ivo Roušar. "Comparison of the Effectiveness Factors for a Reaction at a Pore Wall Calculated on the Assumption of the Langmuir-Hinshelwood Mechanism and According to a Power Equation." Journal of Chemical Technology & Biotechnology 66, no. 2 (1996): 131–34. http://dx.doi.org/10.1002/(sici)1097-4660(199606)66:2<131::aid-jctb490>3.0.co;2-k.

Full text
APA, Harvard, Vancouver, ISO, and other styles
38

Oladipo, Gabriel O., Akinola K. Akinlabi, Samson O. Alayande, Titus A. M. Msagati, Hlengilizwe H. Nyoni, and Opeyemi O. Ogunyinka. "Synthesis, characterization, and photocatalytic activity of silver and zinc co-doped TiO2 nanoparticle for photodegradation of methyl orange dye in aqueous solution." Canadian Journal of Chemistry 97, no. 9 (2019): 642–50. http://dx.doi.org/10.1139/cjc-2018-0308.

Full text
Abstract:
In this study, TiO2 nanocrystals, 1 mol% Ag-doped TiO2, and 1 mol% Ag and 0.6 mol% Zn co-doped TiO2 powders were synthesized by the sol–gel route. Their photocatalytic activities on methyl orange dye under visible irradiation were investigated. The powders were characterized by X-ray diffraction (XRD), UV–visible spectroscopy (UV–vis), Brunauer–Emmett–Teller (BET), and Fourier transform infrared spectroscopy (FTIR). The XRD results revealed the presence of a rutile phase with an average crystallite size of 9 and 11 nm. The UV–vis spectra showed a red-shift towards a longer wavelength with the
APA, Harvard, Vancouver, ISO, and other styles
39

Uyguner, Ceyda Senem, and Miray Bekbolet. "Photocatalytic degradation of natural organic matter: Kinetic considerations and light intensity dependence." International Journal of Photoenergy 6, no. 2 (2004): 73–80. http://dx.doi.org/10.1155/s1110662x0400011x.

Full text
Abstract:
The current study was conducted to investigate the photocatalytic degradation kinetics of humic acid at different light intensities using commercialTiO2powders. The pseudo first order kinetic model and Langmuir-Hinshelwood (L-H) rate equation in modified forms were used to compare the photocatalytic activities ofTiO2materials as a function of light intensity. Under constant irradiation conditions, the pseudo first order reaction rates as well as L-H rates were found to be decreasing in the following trend; Degussa P-25, Millennium PC-500 and Millennium PC-100. The pseudo first order rate const
APA, Harvard, Vancouver, ISO, and other styles
40

Asenjo, Natalia G., Ricardo Santamaría, Clara Blanco, Marcos Granda, Patricia Álvarez, and Rosa Menéndez. "Correct use of the Langmuir–Hinshelwood equation for proving the absence of a synergy effect in the photocatalytic degradation of phenol on a suspended mixture of titania and activated carbon." Carbon 55 (April 2013): 62–69. http://dx.doi.org/10.1016/j.carbon.2012.12.010.

Full text
APA, Harvard, Vancouver, ISO, and other styles
41

Mohammad, Bepari, Aravamudhan, and Kuila. "Kinetics of Fischer–Tropsch Synthesis in a 3-D Printed Stainless Steel Microreactor Using Different Mesoporous Silica Supported Co-Ru Catalysts." Catalysts 9, no. 10 (2019): 872. http://dx.doi.org/10.3390/catal9100872.

Full text
Abstract:
Fischer–Tropsch (FT) synthesis was carried out in a 3D printed stainless steel (SS) microchannel microreactor using bimetallic Co-Ru catalysts on three different mesoporous silica supports. CoRu-MCM-41, CoRu-SBA-15, and CoRu-KIT-6 were synthesized using a one-pot hydrothermal method and characterized by Brunner–Emmett–Teller (BET), temperature programmed reduction (TPR), SEM-EDX, TEM, and X-ray photoelectron spectroscopy (XPS) techniques. The mesoporous catalysts show the long-range ordered structure as supported by BET and low-angle XRD studies. The TPR profiles of metal oxides with H2 varied
APA, Harvard, Vancouver, ISO, and other styles
42

Mashentseva, Anastassiya A., Nurgulim A. Aimanova, Nursanat Parmanbek, Bakhtiyar S. Temirgaziyev, Murat Barsbay, and Maxim V. Zdorovets. "Serratula coronata L. Mediated Synthesis of ZnO Nanoparticles and Their Application for the Removal of Alizarin Yellow R by Photocatalytic Degradation and Adsorption." Nanomaterials 12, no. 19 (2022): 3293. http://dx.doi.org/10.3390/nano12193293.

Full text
Abstract:
In this study, the potential of biogenic zinc oxide nanoparticles (ZnO NPs) in the removal of alizarin yellow R (AY) from aqueous solutions by photocatalytic degradation, as well as adsorption, was investigated. The synthesized ZnO NPs were prepared by the simple wet-combustion method using the plant extract of Serratula coronata L. as a reducing and stabilizing agent and characterized by powder X-ray diffraction, scanning electron microscopy, energy dispersive X-ray and X-ray photoelectron spectroscopy. Photocatalytic degradation of AY was monitored by UV–visible spectroscopy and the effects
APA, Harvard, Vancouver, ISO, and other styles
43

Staelens, N., M. F. Reyniers, and G. B. Marin. "Langmuir–Hinshelwood–Hougen–Watson rate equations for the transalkylation of methylamines." Chemical Engineering Journal 90, no. 1-2 (2002): 185–93. http://dx.doi.org/10.1016/s1385-8947(02)00079-7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
44

Morávek, Vladimír, and Miloš Kraus. "Kinetics of individual steps in reaction network ethanol-diethyl ether-ethylene-water on alumina." Collection of Czechoslovak Chemical Communications 51, no. 4 (1986): 763–73. http://dx.doi.org/10.1135/cccc19860763.

Full text
Abstract:
The rates of single reactions have been measured at 250 °C in the complex reaction of ethanol dehydration to ethylene and to diethyl ether involving also hydrolysis of the ether, its disproportionation to ethanol and ethylene and its dehydration to ethylene. The found dependences of the initial reaction rates on partial pressures of the reactants were correlated by semiempirical Langmuir-Hinshelwood type rate equations.
APA, Harvard, Vancouver, ISO, and other styles
45

MACHIDA, Motoi, Shigeyoshi ONO, and Hideshi HATTORI. "Quantitative Prediction of Aniline and Pyridine Hydrodenitrogenation Reactions by Use of Langmuir-Hinshelwood Equations." Journal of The Japan Petroleum Institute 40, no. 4 (1997): 263–71. http://dx.doi.org/10.1627/jpi1958.40.263.

Full text
APA, Harvard, Vancouver, ISO, and other styles
46

Letková, Zuzana, Alena Brunovská, and Josef Markoš. "Study of Activity Distribution for Consecutive Reactions." Collection of Czechoslovak Chemical Communications 59, no. 8 (1994): 1788–99. http://dx.doi.org/10.1135/cccc19941788.

Full text
Abstract:
The optimal pellet activity distribution for a system of consecutive reactions is analyzed numerically. Two cases are studied: the case of unconstrained activity (without predescribed maximal concentration of active component) leading to a Dirac delta activity distribution and the case with upper bound for the activity distribution (concentration of active component can not exceed given maximal value) which leads to a step function profile. As the objective function global selectivity is chosen. Examples of both cases are given. The reaction kinetics is described by Langmuir-Hinshelwood type o
APA, Harvard, Vancouver, ISO, and other styles
47

Hamryszak, Łukasz, Maria Madej-Lachowska, Mirosław Grzesik, and Michał Śliwa. "Cu/Zn/Zr/Ga Catalyst for Utilisation of Carbon Dioxide to Methanol—Kinetic Equations." Catalysts 12, no. 7 (2022): 757. http://dx.doi.org/10.3390/catal12070757.

Full text
Abstract:
This paper presents the kinetics of methanol synthesis from carbon dioxide and hydrogen over a Cu/Zn/Zr/Ga catalyst. Kinetic studies were carried out in a continuous-flow fixed-bed reactor in a temperature range from 433 to 513 K, pressures from 3 to 8 MPa, and GHSV from 1660 to 10,000 1/h for initial molar fractions of hydrogen from about 0.48 to 0.70, carbon dioxide from 0.05 to about 0.22, and carbon monoxide from 0 to about 0.07. Significant effects of temperature and the composition of the reaction mixture on the conversion degrees α1 and α2 were found. The Cu/Zn/Zr/Ga catalyst showed goo
APA, Harvard, Vancouver, ISO, and other styles
48

Feng, X. G., F. Rong, Tao Wei, and Chun Wei Yuan. "Studies of Photocatalytic Degradation of Trace-Level MC-LR in Water on Thin Film of Titanium Dioxide." Solid State Phenomena 121-123 (March 2007): 951–54. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.951.

Full text
Abstract:
MCs are produced by cyanobacteria and cause concerns in potable water due to toxicity. Conventional treatments are poor at removing MCs. In the present study, the photocatalytic degradation of MC-LR was conducted using nano-TiO2 thin film, prepared by sol-gel and dip-coating method, with UV 365nm irradiation. According to analysis results from solid-phase extraction combined with HPLC method, the trace-level MC-LR is easily to be removed by photocatalytic system. The degradation efficiency of MC-LR is influenced by the pH conditions, initial concentration due to adsorption of MC-LR on TiO2 thi
APA, Harvard, Vancouver, ISO, and other styles
49

Shinde, Sunil B., and Raj M. Deshpande. "Kinetic Study for Chemoselective Hydrogenation of Benzoic Acid to Benzyl Alcohol in a Batch Slurry Reactor using Ru-Sn/Al2O3 Catalyst." Asian Journal of Chemistry 34, no. 10 (2022): 2538–44. http://dx.doi.org/10.14233/ajchem.2022.23817.

Full text
Abstract:
Chemoselective hydrogenation of benzoic acid was carried out using Ru-Sn/Al2O3 catalyst at temperature and hydrogen pressure range of 473-513 K and 3.8-8.8 MPa, respectively. The Sn/Ru ratio in Ru-Sn/Al2O3 catalyst was 5. The initial rates for multiphasic hydrogenation reaction were observed to be first order with respect to catalyst loading, hydrogen partial pressure and benzoic acid. The initial rate data obtained were fitted to different rate equations based on Langmuir-Hinshelwood (L-H) type model and a rate model was obtained which predicted the rate of reaction with an error less than ±
APA, Harvard, Vancouver, ISO, and other styles
50

Williams, Almoruf Olajide Fasola. "Modelling and Dynamic Simulation of One-Dimensional Isothermal Axial Dispersion Tubular Reactors with Power Law and Langmuir-Hinshelwood-Hougen Watson Kinetics." Journal of Applied Science & Process Engineering 8, no. 2 (2021): 834–58. http://dx.doi.org/10.33736/jaspe.3328.2021.

Full text
Abstract:
In this paper, the modelling, numerical lumping and simulation of the dynamics of one-dimensional, isothermal axial dispersion tubular reactors for single, irreversible reactions with Power Law (PL) and Langmuir-Hinshelwood-Hougen-Watson (LHHW)-type kinetics are presented. For the PL-type kinetics, first-order and second-order reactions are considered, while Michaelis-Menten and ethylene hydrogenation or enzyme substrate-inhibited reactions are considered for the LHHW-type kinetics. The partial differential equations (PDEs) developed for the one-dimensional, isothermal axial dispersion tubular
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography