Dimethyl Ether Synthesis via Methanol Dehydration over Diatomite Catalyst Modified Using Hydrochloric Acid

Watcharakorn Pranee; Pornsawan Assawasaengrat; Arthit Neramittagapong; Sutasinee Neramittagapong

doi:10.4028/www.scientific.net/AMR.931-932.42

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 931-932Dimethyl Ether Synthesis via Methanol Dehydration...

Dimethyl Ether Synthesis via Methanol Dehydration over Diatomite Catalyst Modified Using Hydrochloric Acid

Abstract:

The synthesis of dimethyl ether via methanol dehydration has been carried out over untreated-diatomite catalyst (DM) and hydrochloric acid modified treatment on diatomite catalyst (DMHC). The reactions were carried out in a fixed-bed reactor. The effects of hydrochloric acid modifications of diatomite on its catalytic performance were studied. The characterization such as XRD, SEM, FT-IR and FT-Raman had no deformation after HCl-modified treatment on catalysts. DMHC catalyst apparently gave the higher methanol conversion rate than DM due to the acidity while the selectivity of dimethyl ether from 250 to 350°C was slightly changed. The acidity was depended upon Al^(IV) ions; nevertheless, both Al^(V) and Al^(VI) were affected and hence increasing the basic active sites. Not only was the competitively catalytic methanol dehydrogenation preferred with basic condition but also methanol-blocking water molecule interaction was the unwanted reaction. In this investigation, the chemical-bond arrangements of silicon and aluminium ions were proposed with solid MAS/NMR. The DMHC catalyst exhibited better DME yield than the DM catalyst, and it could be used as a selective catalyst for DME synthesis from methanol.

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Periodical:

Advanced Materials Research (Volumes 931-932)

Pages:

42-46

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.931-932.42

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Online since:

May 2014

Authors:

Watcharakorn Pranee, Pornsawan Assawasaengrat, Arthit Neramittagapong, Sutasinee Neramittagapong*

Keywords:

Acid Catalyst, Diatomite, DME, Methanol, Renewable Energy

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