SAPO-34 catalyst for dimethylether production

Pop, Grigore; Theodorescu, Cristian

doi:10.1016/s0167-2991(00)80971-4

Cited by 2 publications

(5 citation statements)

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“…Further, the extruded catalyst pellets were activated by heating in air at 600 °C for 8 h. The H-SAPO-34/γ-Al 2 O 3 weight ratio in the final calcined catalyst was roughly 1/4. Our tests evidenced that H-SAPO-34 concentrations in the formulated catalyst higher than 25% (by wt) do not improve significantly its activity in the process of methanol conversion to DME …”

Section: Catalyst Synthesis and Characterizationmentioning

confidence: 78%

“…The amorphous phosphorus−alumina−silica gel was obtained by mixing an alumina−water suspension with silica sol, under continuous stirring, at room temperature and pressure and subsequent addition of tetraethylammonium phosphate (TEA + H 2 PO 4 − ). The pH of the mixture was kept nearly constant by successive adding of phosphoric acid . The initial gel oxide composition is: P 2 O 5 : 1 .67Al 2 O 3 : 0 .34SiO 2 : 1 .68TEAOH : 128H 2 O …”

Section: Catalyst Synthesis and Characterizationmentioning

confidence: 99%

“…The pH of the mixture was kept nearly constant by successive adding of phosphoric acid. 8 The initial gel oxide composition is:…”

Section: Catalyst Synthesis and Characterizationmentioning

confidence: 99%

“…Our tests evidenced that H-SAPO-34 concentrations in the formulated catalyst higher than 25% (by wt) do not improve significantly its activity in the process of methanol conversion to DME. 8 BET surface area and porosity of the pure H-SAPO-34 molecular sieve and formulated catalyst were measured on a Quantachrome Instruments apparatus, by using nitrogen as analysis gas. The adsorption-desorption isotherms obtained for the active component (H-SAPO-34) and for the formulated catalyst are presented in Figure 5, and the main numerical data are in Table 2.…”

Section: Catalyst Synthesis and Characterizationmentioning

confidence: 99%

“…Successful studies of the methanol dehydration to DME process were carried out over H-Mordenite, H-Mordenite dealuminated or modified with different metal oxides, , Ferrierite, Y and Beta zeolites, H-ZSM-5, NaH-ZSM-5, , SUZ-4, modified natural clinoptilolite, H-SAPO-34, , γ-alumina − and silica modified γ-alumina, η-alumina, or ion exchange resins . MCM-22, H-MCM-41, modified MCM-41, and mesoporous alumina proved also to be interesting catalysts for methanol etherification…”

Section: Introductionmentioning

confidence: 99%

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Methanol Conversion to Dimethyl Ether over H-SAPO-34 Catalyst

Pop

Bozga

Ganea

et al. 2009

Ind. Eng. Chem. Res.

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The process of methanol conversion to dimethyl ether over an H-SAPO-34 molecular sieve was studied, using the catalyst as synthesized or formulated in an alumina matrix. The experiments were performed on the temperature interval 100−250 °C, liquid space velocities of 1−5 h−1, and pressures between 1 and 10 bar. The results evidenced a high catalytic activity of the H-SAPO-34 molecular sieve, providing in these conditions a practically total methanol transformation to dimethyl ether. Also, a special run, performed at 180 °C, with an output composition close to chemical equilibrium, showed no significant change of catalyst activity during an on-stream time of 50 h, this proving a good stability and resistance to deactivation. A published rate expression for the methanol dehydration reaction was selected and adapted to describe the experimentally observed process kinetics.

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Section: Catalyst Synthesis and Characterizationmentioning

confidence: 78%