Ba-Ni-Hexaaluminate as a New Catalyst in the Steam Reforming of 1-Methyl Naphthalene and Methane

Abstract This work investigates the long-term performance of Ba-Ni-hexaaluminate, BaNixAl12−xO19 as a catalyst in reforming of 1-methyl naphthalene and/or methane in a model-gas simulating that from a circulating fluidized bed (CFB) gasifier during 23–29 h in a lab scale set-up, as well as the tendency for coke formation, sintering and sulphur poisoning. 1-Methyl naphthalene is used as a tar model substance. The Ba-Ni-hexaaluminate induces a high conversion of both compounds in the temperatures investigated (850 and 950 °C) under sulphur-free conditions. In sulphur-containing gas, the methane conversion stops at 20 ppm H2S and the reforming of 1-MNP at 850 °C is slightly reduced at 100 ppm. Graphic Abstract

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Study on Long Term Performance of Concrete of Slag-Alkali Higher Calcium Fly Ash

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.302-303.98 ◽

2006 ◽

Vol 302-303 ◽

pp. 98-104

Author(s):

Ming Tang ◽

Xiao Li

Keyword(s):

Fly Ash ◽

Orthogonal Design ◽

Concrete Specimen ◽

Mixture Ratio ◽

Dispersion Degree ◽

Set Up ◽

Long Term Performance ◽

Term Performance ◽

Mixture Ratio Design

The slag-alkali is used to activate the activity of higher calsium fly ash. By the designs of the mixture ratio and the quadratic regression orthogonal design, the best combination is sought out. Several mixture factors which affect the rule of the concrete material properties and long term performance are researched. The mathematic models which are set up by the mixture ratio design with the quadralic regression orthogonal design can be effective. The precision is high. The strength of the concrete of slag-alkali fly ash was still increasing after 8 year. The dispersion degree of those specimens is small. The SEM photo of cracked specimen and early concrete specimen shows the surface of fly ash in 7 days concrete is slick and that in 8 years old specimen has been enwrapped tightly by much hydrate plant.

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Development of Test Equipment for Evaluating Hydraulic Conductivity of Permeable Block Pavements

Sustainability ◽

10.3390/su10072549 ◽

2018 ◽

Vol 10 (7) ◽

pp. 2549 ◽

Cited By ~ 1

Author(s):

Jaehun Ahn ◽

Aryssa Marcaida ◽

Yoongeun Lee ◽

Jongwon Jung

Keyword(s):

Low Impact Development ◽

Test System ◽

Silica Sand ◽

Small Scale ◽

Pavement Materials ◽

Constant Head ◽

Set Up ◽

Long Term Performance ◽

Term Performance

The use of permeable block pavement has been acknowledged as one of the promising Low Impact Development (LID) strategies to mitigate the harmful effects of depletion of natural surfaces, due to the uncontrollable development of infrastructure and buildings. Numerous studies, associated with drainage properties and long-term performance of this traditional pavement alternative, have been conducted in the past 30 years. Nevertheless, standardized equipment and methodologies are still limited, specifically for small-scale laboratory models. This paper suggests equipment that is capable of evaluating the hydraulic performance of permeable pavement materials in a laboratory set-up, by monitoring permeability and simulating the physical clogging process. Constant head permeability tests with systematic application of fine clogging particles were conducted on three identical permeable block systems (PBS), composed of four stone pavers. Each test system received an equivalent amount of eight years’ particle loading of silica sand, with different size distributions. The experimental results revealed that all the models showed permeability degradation trends similar to those presented in other literature.

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Effect of potassium addition on a long term performance of Co–ZnO–Al2O3 catalysts in the low-temperature steam reforming of ethanol: Co-precipitation vs citrate method of catalysts synthesis

Applied Catalysis A General ◽

10.1016/j.apcata.2015.08.003 ◽

2015 ◽

Vol 505 ◽

pp. 173-182 ◽

Cited By ~ 18

Author(s):

Bogna Banach ◽

Andrzej Machocki

Keyword(s):

Low Temperature ◽

Steam Reforming ◽

Citrate Method ◽

Steam Reforming Of Ethanol ◽

Co Precipitation ◽

Long Term Performance ◽

Term Performance ◽

Potassium Addition

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Thermal cycling: impact on bentonite permeability

Mineralogical Magazine ◽

10.1180/minmag.2015.079.6.29 ◽

2015 ◽

Vol 79 (6) ◽

pp. 1543-1550 ◽

Cited By ~ 2

Author(s):

S. G. Zihms ◽

J. F. Harrington

Keyword(s):

Boundary Condition ◽

Thermal Loading ◽

Mechanical Responses ◽

Swelling Capacity ◽

Water Viscosity ◽

Set Up ◽

Long Term Performance ◽

Host Rocks ◽

Term Performance

AbstractDue to its favourable properties, in particular, low permeability and swelling capacity, bentonite has been favoured as an engineered-barrier and backfill material for the geological storage of radioactive waste. To ensure its safe long-term performance it is important to understand any changes in these properties when the material is subject to heat-emitting waste. As such, this study investigates the hydraulic response of bentonite under multi-step thermal loading subject to a constant-volume boundary condition, to represent a barrier system used in a crystalline or other hard-rock host rock. The experimental set up allows continuous measurement of the hydraulic and mechanical responses during each phase of the thermal cycle. After the initial hydration of the bentonite, the temperature was raised in 20°C increments from 20 to 80°C followed by a final step to reach 120°C. Each temperature was held constant for at least 7–10 days to allow the hydraulic transients to equilibrate. The data suggest that the permeability of bentonite appears to be sensitive to changes in temperature which may extend beyond those explained by simple changes in water viscosity. However, permeability may be boundary-condition dependent and this should be considered when designing experiments or applying these results to other repository host rocks. Either way, the magnitude of the change in permeability observed in this study is minor and its impact on the hydraulic performance of the barrier is negligible.

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