issues in hydrogen production using gasification

... mediated in these organisms using proteins coordinatedin an enzymatic pathway under anaerobic conditions Initially, CO induces the thesis of several proteins including CO dehydrogenase, Fe-S protein, ... Clostridiumpropionicum is an inefficient biohydrogen-producing strain The partial pressure ofhydrogen is a limiting factor in dark fermentation because an increase in hydrogenpressure decreases its production ... The predominant use of hydrogen is found in hydrogenation, hydro-treating, and hydrodesulfurization in petrochemical refineries The second significantuse of hydrogen is recognized in the production

Ngày tải lên: 04/01/2018, 22:54

... Trang 1Original ArticleTWO-DIMENSIONAL SIMULATION OF HYDROGEN IODIDE DECOMPOSITION REACTION USING FLUENT CODE FOR HYDROGEN PRODUCTION USING NUCLEAR TECHNOLOGY JUNG-SIK CHOIa, YOUNG-JOON SHINb, KI-YOUNG ... device devel-opment Hydrogen production increased with an increase of the surface-to-volume (STV) ratio With an increase of hydrogen production, the reaction heat increased The internal pressure ... process), no hydrogen production occurred regardless of the STV ratio From 20 minutes to 120 minutes, the amount of hydrogen production varied according to the STV ratio: the hydrogen production

Ngày tải lên: 12/04/2021, 08:47

... Published by the American Institute of Physics Trang 2Negative-ion surface production in hydrogen plasmas: Determinationof the negative-ion energy and angle distribution function using mass spectrometry ... listed elsewhere48and reminded in TableI 107incident positive ions have been used in these calculations yielding2  106H par-ticles emitted from the surface, including backscattered and sputtered ... for particle accelerators.12–14 Surface production of negative-ions is also observed in sputtering processes as shown in Refs.25–27 In magnetically confined fusion devices (tokamaks), NI can be

Ngày tải lên: 04/12/2022, 15:31

... fertilizers, upgrading of fuels in the refining industry, methanol synthesis, manufacturing of electronics and metallurgic processes There is also an increasing interest in hydrogen as a future ... steam according to reaction(5), producing H2 in the process Measured data for a one-hour experiment is shown inFig 6 InFig 6, it can be seen that H2was not produced during the initial few minutes, ... period (min) Tsr(
C) Fsteam,sr (Ln/min) FN 2 ;sr (Ln/min) Ffuel,fr (Ln/min) (Ln/min) Trang 94.3 Reactor performanceAs have been explained above, inert argon was used as fluidization gas in the

Ngày tải lên: 25/11/2016, 21:52

... Brazilian Journal of Chemical Engineering EVALUATING HYDROGEN PRODUCTION IN BIOGAS REFORMING IN A MEMBRANE REACTOR Department of Chemical Engineering, Federal University of Pernambuco, CEP: 50740-520, ... stream (min) (773 K) (823 K) (873 K) without permeation with permeation 144 min 162mmin 144 min 0 10 20 30 40 50 Time on stream (min) (773 K) (823 K) (873 K) 144 min 162 min 144 min without ... reaction) Thus, in operation with hydrogen permeation, the methane conversion increased to maintain the methane cata-lytic cracking equilibrium (step I) Accordingly, the removal of hydrogen from

Ngày tải lên: 04/04/2018, 12:36

... role in the growth and hydrogen production of strain C beijerinckii CB3 In this study, the impact of these elements on the growth and hydrogen production of strain was investigated by determining ... tgrowth and hydrogen production As can be seen on Figure 9, hydrogen production and growth increased with increasing orbital shaking rate (from 50to 200 rpm), resulting in hydrogen production ... major components in salts solution of the basic culture medium The salt play an important role in maintaining pH and osmotic pressure of the organism, may resulting in maintaining the initial pH to

Ngày tải lên: 18/03/2021, 10:32

... also included in thefigure The process was investigated by first varying the NiO:C ratio while maintaining S:C of 3 inFig 5(a and b), then followed by changing the S:C between 0 and 3 while maintaining ... vessel, resulting in intermittent H2production, a continuous operating process using at least two reactor vessels seems to be more attractive[18] The CO2produced during steam reforming is captured ... reaching 245 Mt NH3in 2018[5] Hydro-gen production, management and recovery within petroleum refineries is also increasing particularly in the production of low-sulphur and die-sel fuels using

Ngày tải lên: 24/11/2022, 17:38

... β-CGTase activities of the nine plasmid-containing strains using shake-flask cultivation Eight of the nine promoters, including promoter Pxyl′, which does not contain the xylose repressor encoded ... plasmid-containing strain CGT7, which expressed β-CGTase using the PamyQ′ promoter These results were verified using SDS-PAGE analysis (Fig. 2b) The dry cell weight of plasmid-contain-ing strain CGTd2 ... plasmid-contain-ing strains CGT1 and CGT7 peaked at 48  h, while the β-CGTase activity of plasmid-containing strain CGTd4 increased 10.3% from 48 to 60  h The dry cell weights of plasmid-containing strains

Ngày tải lên: 04/12/2022, 10:32

... containing ZrO2 After aging for 24 h at room temperature, evaporation of water and drying at 120°C for 2 h, the sample was calcined in air flow at 700°C for 3 h, put into the beaker again and ... several times with demineralized water and incubated overnight in demineralized water to remove residues of the alkali-soluble fractions The obtained pulps were processed Trang 5using a membrane screener ... 600°C still remains the major one in the latter case According to literature data, for nickel catalysts operating in high temperatures, Table 5 Production of gaseous products in the process performed

Ngày tải lên: 04/12/2022, 10:36

... immobilization in agar-agar spheres These resultswere not as promising as those obtained using calciumalginate, since a small increase of 0.5% in productivitywas obtained comparing to free cells ... formation of interactions or bonds between cellsand the solid, which can occur naturally or induced byusing binding agents (metal oxides or covalent bindingagents, such as glutaraldehyde or aminosilane) ... main fermentation strategies pro-posed to improve the production of 2G ethanol by fer-mentation using immobilization, focusing mainly on its use as a protection strategy against the action of inhibi-tors

Ngày tải lên: 11/04/2024, 21:51

... the administration of infertility drugs, if ultrasound monitoring indicated maturation of multiple follicle cells (Manier, 1998: p 1) At that point, clinicians might have declined to administer ... spe-cialized training in infertility treatment can and do prescribe infertility drugs without utilizing techniques that would minimize the risk of high-order multiples Whether administered by generalists ... method of terminating some of the embryos or fetuses in a multiple gestation is direct termination at 9 to 12 weeks through transabdominal needle insertion of potassium chloride into the fetal

Ngày tải lên: 01/11/2013, 08:20

... labor wisely Against this backdrop, using factory-terminated fiber in stations makes a lot of sense The labor savings associated with using factory-terminated cables in most instances make it ... fiber, relying on factory-terminated cables offers several advantages over field termination, including performance and savings in labor, material costs and installation time Unlike field-terminated ... concepts include: • Bend radius: At turns in fiber runs, maintain a 1.5-inch bend radius Tighter bends may cause micro-bending of individual fibers that allow light to escape the signal path, resulting

Ngày tải lên: 10/12/2013, 02:15

... Withdrawal: the individual responds to conflict by ceasing to talk, sulking, retiring hurt, becoming resentful, becoming depressed, saying nasty things behind another’s back, stopping caring about ... 1 0 Chinese (male) Chinese (female) Indian (male) Indian (female) Malay (male) Malay (female) Competing Collaborating Compromising Avoiding Accommodating Key : Figure 3. Modes of handling conflict ... of Singapore and management in Singapore Gender Figure 2 indicates the dominant modes of handling conflict The two predominant modes of handling conflict for both men and women were compromising

Ngày tải lên: 13/12/2013, 20:15

... resources indicates the human effort involved in designing and maintaining the automated machines The ranking assigned for human resources may be higher during manufacturing, installation and maintenance ... due to direct chemical looping being in its infancy in the energy conversion industry [42] This process is widely used in steel manufacturing but not in the hydrogen production sector Technical ... several industries for using and storing CO2 in various forms The main challenge for using carbonaceous solid fuels in producing hydrogen is the disposal/storage of the captured CO2 in an environmentally...

Ngày tải lên: 05/09/2013, 14:58

... degradation in continuous culture at 55 °C Even though molecular hydrogen consumption has been recognized as a possible hindrance for sustainable hydrogen production [21-24], simultaneous H2 production ... the strong influence of pH on the product distribution [26-29] These studies show a decrease in butyrate and hydrogen production and an increase in acetate and ethanol with increasing pH The ... evaluation on H2 production in glucose fermentation Environ Sci Technol 2008, 42(7), 2401-2407 [10] Mathews J., Wang G Metabolic pathway engineering for enhanced Biohydrogen production Int J Hydrogen...

Ngày tải lên: 05/09/2013, 14:58

... soft, moist and stringy and tend to interfere with certain mechanical feeding methods, such as screw feeders Biomass is resized and reshaped using various methods, including rotating knives, rollers, ... clog engine valves, cause deposition on turbine blades or fouling of a turbine system leading to decreased performance and increased maintenance In addition, these heavy hydrocarbons interfere ... focused on producing electricity more efficiently by integrating the gasification system with a gas turbine The following R&D, geared to producing syngas for fuels, chemicals and hydrogen production, ...

Ngày tải lên: 18/03/2014, 02:20

... the research so the input of Australian staff in the actual training program of TOT was minimal and did not warrant inclusion in the cost of the training 10 GAP Workshop in Binh Thuan (21-22/7/2008) ... specialisation in the varieties of citrus grown within provinces in Vietnam, with farmers in Dong Thap growing almost exclusively mandarins (Tieu) and farmers in Nhge An provinces growing almost ... reduction in labour costs mentioned times, resulting in 47% of farmers declaring a reduction in input costs Ben Tre was the only province in which no mention was made of reduced input costs Increased...

Ngày tải lên: 21/06/2014, 05:20

... were installed in the ASBR, and five ports in the UASB for sampling, injecting NaOH, feeding, de-sludge, and decanting The ports were 9cm long and 0.8cm inside diameter and were made of stainless ... Research Objectives The intention of this study was to optimize hydrogen production as well as avoiding the controlling methods by enriching the biomass by subjecting it to a combination of acid treatment, ... hydrogen production stability of the enriched culture is compared in a continuous approach by UASB and a batch approach by an ASBR for stable hydrogen production Chapter One Introduction Hydrogen Production...

Ngày tải lên: 22/10/2015, 21:14

... working with Indigo in the future This chapter contains the following: • Overview of Indigo architecture, including the Indigo service layer, the Indigo connector, hosting environments, messaging ... supports, including data type information, and binding information for locating and communicating with the Web service operations • Services provide endpoints that consumers and other services can bind ... implementing industry-standard Web service specifications, including WS-Security: A wide-ranging specification that integrates a set of popular security technologies, including digital signing and...

Ngày tải lên: 20/08/2012, 13:59

... in the context of ethical issues in withdrawing life-sustaining treatment He writes, ‘Life-sustaining treatment implies that treatment is being given in order to maintain or create the best possible ... now face a growing number of controversial issues involving human reproduction To illustrate the variety of issues, consider the following three scenarios In the Wrst case, involving a pregnant ... results in the infant becoming involved in a growing number and variety of social relationships In summary, none of the views discussed above provides an adequate account of moral standing In looking...

Ngày tải lên: 21/09/2012, 10:54