Synthesis of lower olefins from syngas over Zn/Al2O3–SAPO-34 hybrid catalysts: role of doped Zr and influence of the Zn/Al2O3ratio

Hybrid catalysts composed of different loadings of Zr-promoted Zn/Al2O3with SAPO-34 zeolite were investigated for the direct synthesis of lower olefins from syngas in a fixed-bed reactor.

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Role of filter media in an anaerobic fixed-bed reactor

Water Science & Technology ◽

10.2166/wst.1995.0353 ◽

1995 ◽

Vol 31 (9) ◽

pp. 137-144 ◽

Cited By ~ 3

Author(s):

T. Miyahara ◽

M. Takano ◽

T. Noike

Keyword(s):

Anaerobic Bacteria ◽

Fixed Bed ◽

Methanogenic Bacteria ◽

The Other ◽

Fixed Bed Reactor ◽

Filter Media ◽

Fixed Bed Reactors ◽

Attached Bacteria ◽

The Relationship

The relationship between the filter media and the behaviour of anaerobic bacteria was studied using anaerobic fixed-bed reactors. At an HRT of 48 hours, the number of suspended acidogenic bacteria was higher than those attached to the filter media. On the other hand, the number of attached methanogenic bacteria was more than ten times as higher than that of suspended ones. The numbers of suspended and deposited acidogenic and methanogenic bacteria in the reactor operated at an HRT of 3 hours were almost the same as those in the reactor operated at an HRT of 48 hours. Accumulation of attached bacteria was promoted by decreasing the HRT of the reactor. The number of acidogenic bacteria in the reactor packed sparsely with the filter media was higher than that in the closely packed reactor. The number of methanogenic bacteria in the sparsely packed reactor was lower than that in the closely packed reactor.

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Hierarchical H-ZSM5 zeolites based on natural kaolinite as a high-performance catalyst for methanol to aromatic hydrocarbons conversion

Scientific Reports ◽

10.1038/s41598-019-54089-y ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 3

Author(s):

Ahmad Asghari ◽

Mohammadreza Khanmohammadi Khorrami ◽

Sayed Habib Kazemi

Keyword(s):

Pore Size ◽

Aromatic Hydrocarbons ◽

High Performance ◽

Low Cost ◽

Direct Synthesis ◽

Fixed Bed ◽

Methanol Conversion ◽

Catalytic Performance ◽

Fixed Bed Reactor ◽

Good Prospect

AbstractThe present work introduces a good prospect for the development of hierarchical catalysts with excellent catalytic performance in the methanol to aromatic hydrocarbons conversion (MTA) process. Hierarchical H-ZSM5 zeolites, with a tailored pore size and different Si/Al ratios, were synthesized directly using natural kaolin clay as a low-cost silica and aluminium resource. Further explored for the direct synthesis of hierarchical HZSM-5 structures was the steam assisted conversion (SAC) with a cost-effective and green affordable saccharide source of high fructose corn syrup (HFCS), as a secondary mesopore agent. The fabricated zeolites exhibiting good crystallinity, 2D and 3D nanostructures, high specific surface area, tailored pore size, and tunable acidity. Finally, the catalyst performance in the conversion of methanol to aromatic hydrocarbons was tested in a fixed bed reactor. The synthesized H-ZSM5 catalysts exhibited superior methanol conversion (over 100 h up to 90%) and selectivity (over 85%) in the methanol conversion to aromatic hydrocarbon products.

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The role of catalyst environment on CO 2 hydrogenation in a fixed-bed reactor

Journal of CO2 Utilization ◽

10.1016/j.jcou.2016.10.014 ◽

2017 ◽

Vol 17 ◽

pp. 1-9 ◽

Cited By ~ 10

Author(s):

Matthew J. Bradley ◽

Ramagopal Ananth ◽

Heather D. Willauer ◽

Jeffrey W. Baldwin ◽

Dennis R. Hardy ◽

...

Keyword(s):

Fixed Bed ◽

Fixed Bed Reactor

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Studies on the Role of Nitrogen in the Feed for Fischer-Tropsch Synthesis Under Fixed-Bed Reactor System

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2016.11938 ◽

2016 ◽

Vol 16 (2) ◽

pp. 1894-1897 ◽

Cited By ~ 4

Author(s):

Gi Hoon Hong ◽

Jae-Sun Jung ◽

Na-Young Kim ◽

Sang Yong Lee ◽

Dong Ju Moon

Keyword(s):

Fixed Bed ◽

Tropsch Synthesis ◽

Reactor System ◽

Fixed Bed Reactor ◽

Fischer Tropsch ◽

Fischer Tropsch Synthesis

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Microwave-assisted direct synthesis of butene from high-selectivity methane

Royal Society Open Science ◽

10.1098/rsos.171367 ◽

2017 ◽

Vol 4 (12) ◽

pp. 171367

Author(s):

Yi-heng Lu ◽

Kang Li ◽

Yu-wei Lu

Keyword(s):

Methane Conversion ◽

Liquid Fuel ◽

Impact Ionization ◽

Direct Synthesis ◽

Fixed Bed ◽

Volume Ratio ◽

Raw Material ◽

Fixed Bed Reactor ◽

Ionization Mass ◽

Catalytic Dehydrogenation

Methane was directly converted to butene liquid fuel by microwave-induced non-oxidative catalytic dehydrogenation under 0.1–0.2 MPa. The results show that, under microwave heating in a two-stage fixed-bed reactor, in which nickel powder and NiO x –MoO y /SiO 2 are used as the catalyst, the methane–hydrogen mixture is used as the raw material, with no acetylene detected. The methane conversion is more than 73.2%, and the selectivity of methane to butene is 99.0%. Increasing the hydrogen/methane feed volume ratio increases methane conversion and selectivity. Gas chromatography/electron impact ionization/mass spectrometry chromatographic analysis showed that the liquid fuel produced by methane dehydrogenation oligomerization contained 89.44% of butene, and the rest was acetic acid, ethanol, butenol and butyric acid, and the content was 1.0–3.0 wt%.

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