Notice of RetractionStudy on synthsis dimethyl ether with Bi-function catalyst by phosphorus modified

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A new modified bifunctional catalyst (C301/P-γ-Al₂O₃) is preparation with basic Cu (C301) catalyst for synthesis Methanol and modified dehydrate catalyst (P-γ-Al₂O₃) with H₃PO₄ dipping and calcinations. There are new O=P-O bond to be found in the modified γ-Al₂O₃ by analyse with FT-IR and X-ray diffraction, and it increase the pair acid-alkali in dehydrate catalyzer. And the modified bifunctional catalyst(C301/P-γ-Al₂O₃) enhance the capability of methanol conversion to DME (Dimethyl Ether), and increase the conversion rate of total Carbon and selectivity of DME. The factor and technology of synthsis DME with the modified catalyst in slurry reactor were studied. The results shown that synthsis DME was greater influenced by temperature, pressure, airspeed and CO₂ concentration in the syngas. The CO conversion per pass reached 93% and DME selective was more than 60% at 150mL liquid paraffin, catalyst for solvent quality 7.3%, n(H₂)/n(CO) = 2, T = 270°C, P = 4.3 MPa, space velocity 600 ml/h·gcat. The existence of CO₂ in the syngas will be improved the yield of DME.