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Synthesis of higher alcohols from syngas over alkali promoted MoS2 catalysts supported on multi-walled carbon nanotubes

Paper ID Volume ID Publish Year Pages File Format Full-Text
42571 45931 2009 9 PDF Available
Title
Synthesis of higher alcohols from syngas over alkali promoted MoS2 catalysts supported on multi-walled carbon nanotubes
Abstract

An extensive study of higher alcohol synthesis from synthesis gas using potassium (K) promoted molybdenum sulfide supported on multi-wall carbon nanotubes (MWCNT) catalysts is reported. Up to 20 wt.% of Mo and 9 wt.% of K are added to the MWCNT by incipient wetness impregnation method. The catalysts are extensively characterized by different methods and the activity and selectivity of the catalysts are assessed in a fixed-bed micro-reactor. Increasing the amount of K from 3 to 9 wt.% increased K–Mo–O interactions, decreased the Mo particle sizes from 20.6 to 12.2 nm and increased the percentage dispersion from 20.2% to 30.9%. Most of the metal particles (∼80%) were homogeneously distributed inside the tubes and the rest on the outer surface of the MWCNT. Temperature programmed reduction (TPR) tests showed that increasing the amount of Mo increased the first and second TPR peak temperatures from 516 and 765 to 530 and 835 °C, respectively. However, addition of K decreased the peak temperatures from 534 and 825 to 519 and 787 °C, respectively. DRIFT spectroscopy of absorbed CO was used to study the nature of active species in the sulfided form of catalysts. Addition of K increased the formation of alcohols and suppressed the formation of hydrocarbons. Catalyst 15 wt.% Mo and 9 wt.% K supported on MWCNT showed the highest yield (0.11 g of total alcohol/g catalyst/h) and selectivity (25.6%) towards alcohols. The optimum conditions for producing the higher alcohols from synthesis gas (mole ratio of H2 and CO is equal to 2) using gas hourly space velocity (GHSV) of 3.6 m3 (STP)/h/kg of catalyst are determined to be 320 °C and 9.65 MPa (1400 psig).

Graphical abstractAn extensive study of higher alcohol synthesis from synthesis gas using potassium (K) promoted molybdenum sulfide supported on multi-wall carbon nanotubes (MWCNT) catalysts is reported. The optimum conditions for producing the higher alcohols from synthesis gas using gas hourly space velocity (GHSV) of 3.6 m3 (STP)/h/kg of catalyst were determined as 320 °C and 9.65 MPa (1400 psig).Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
MWCNT, multi-wall carbon nanotubes; TPR, temperature programmed reduction; GHSV, gas hourly space velocity; ICP-MS, inductively coupled plasma-mass spectroscopy; TGA, thermo gravimetric analysis; XRD, X-ray diffraction; TEM, transmission electron microsco
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Synthesis of higher alcohols from syngas over alkali promoted MoS2 catalysts supported on multi-walled carbon nanotubes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 365, Issue 2, 31 August 2009, Pages 243–251
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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