Catalytic Reaction Of Methanol Research Articles

Synthesis of methylmercaptan from methanol and hydrogen sulfide at elevated pressure on an industrial catalyst

The catalytic reaction of methanol with hydrogen sulfide at a total pressure of 0.1–1.8 MPa was investigated. The main product at different values of total pressure in the system was methylmercaptan, and the by-products were dimethyl sulfide, dimethyl ether, carbon oxides. An increase in the contact time increased the yields of methylmercaptan and dimethyl sulfide, whereas the yields of dimethyl ether and gases changed slightly. The selectivity for methylmercaptan was approximately constant up to a ∼95% conversion of methanol. The elevation in temperature increased the reaction rate but barely affected the product formation selectivity. The rate of methanol conversion increases linearly with the hydrogen sulfide concentration and depends on the methanol concentration raised to a power of 0.4–0.5; water retards the process. The selectivity for methylmercaptan decreases, and that for dimethyl sulfide and dimethyl ether increases at an H2S to methanol molar ratio below 1.4: 1, regardless of the value of total pressure. The reaction rate increases with the total pressure raised to a power 0.4–0.5; however, the selectivities for methylmercaptan and by-products remain unchanged.

Catalytic reaction of methanol with alkanethiols

Methanol reacts with primary alkanethiols (R=C1–C3) over alumina catalysts to yield dialkyl sulfides. Methanethiol is completely converted to dimethyl sulfide. Ethane-and 2-propanethiols give methyl alkyl sulfides. However, the process is complicated by side reactions producing olefins and dimethyl sulfide. If mixed thiols are used, their transformations hinder each other.

Catalytic reaction of methanol with a series of ruthenium(II) complexes and the mechanism of the formation of acetic acid from methanol alone

The catalytic abilities of a series of ruthenium(II) complexes containing zero, one and two SnCl3– ligands, [RuCl2{P(OMe)3}4]1, [RuCl(SnCl3){P(OMe)3}4]2 and [Ru(SnCl3)2{P(OMe)3}3]3, have been compared in the reaction of methanol to form acetic acid (and/or methyl acetate due to esterification), as well as their reactions with the possible intermediates (formaldehyde, methyl formate) in the overall reaction. It was found that the formation of acetic acid from methanol occurred only with 3, which also converted paraformaldehyde or methyl formate into acetic acid. Complex 1 showed only a catalytic activity for the Tischenko-type dimerization (2HCHO → HCO2Me), and 2 exhibited an intermediate character, being able to catalyse the two reactions (2HCHO → HCO2Me, HCO2Me → MeCO2H) but unable to react with methanol. Based on kinetic results for the reaction of methanol with 3, a possible reaction pathway is proposed where methyl formate and acetic acid are formed from formaldehyde competitively sharing a common reaction path. For the isomerization of methyl formate as a substrate a separate reaction path is suggested, where the RuII–SnII bimetallic centre of 2 and 3 converts the co-ordinated HCO2Me into a five-membered acetate bridge.

A low-pressure guerbet reaction over magnesium oxide catalyst

Propan-1-ol and 2-methylpropan-1-ol were synthesized selectively by the catalytic reaction of methanol and ethanol over magnesium oxide.

C-O bond rupture in catalytic reactions of methanol on polycrystalline nickel foils: Comment on “Methanol decomposition on Ni(111): investigation of the C-O bond scission mechanism” by J.N. Russell Jr., I. Chorkendorff and J.T. Yates, Jr.

C-O bond rupture in catalytic reactions of methanol on polycrystalline nickel foils: Comment on “Methanol decomposition on Ni(111): investigation of the C-O bond scission mechanism” by J.N. Russell Jr., I. Chorkendorff and J.T. Yates, Jr.

C-O bond rupture in catalytic reactions of methanol on polycrystalline nickel foils Comment on “Methanol decomposition on Ni(111): investigation of the C-O bond scission mechanism” by J.N. Russell Jr., I. Chorkendorff and J.T. Yates Jr.

C-O bond rupture in catalytic reactions of methanol on polycrystalline nickel foils Comment on “Methanol decomposition on Ni(111): investigation of the C-O bond scission mechanism” by J.N. Russell Jr., I. Chorkendorff and J.T. Yates Jr.

One-step catalytic synthesis of 2,2,3-trimethylbutane from methanol

Catalytic reaction of methanol in the presence of zinc iodide produces butane and higher hydrocarbons with a high degree of branching and an unexpectedly high triptane (2,2,3-trimethylbutane) content.