Catalyst used for preparation of bromomethane and CO through methane bromination-oxidation, and preparation method and application thereof

Abstract

The invention provides a catalyst used for the preparation of bromomethane and CO through methane bromination-oxidation. The catalyst contains a main active component and a carrier, wherein the main active component is one or more selected from FePO4, Fe3P2O7 and Fe3(P2O7)2, the carrier is one or more of TiC-SiC and TiO2-SiC, and the content of the main active component in the catalyst is 1.0-50.0wt%. The catalyst is prepared through the steps of supporting an impregnation liquid containing the main active component onto the carrier through an impregnation technology, drying and roasting, and the catalyst can catalyze a mixture comprising methane, oxygen and an aqueous solution of HBr converted into bromomethane and CO in a high activity and high selectivity manner under reaction conditions comprising normal pressure and a temperature of 400-800DEG C. The catalyst has the advantages of good performances, on obvious inactivation in a continuous reaction process carried out for above 1400h, and no carbon deposition on the catalyst.

Description

technical field [0001] The invention relates to a catalyst, more particularly to a catalyst for preparing methyl bromide and CO by oxidation of methane bromide, a preparation method and application thereof. Background technique [0002] Natural gas has a large stock, wide distribution, and high H / C ratio in its composition. It has always been considered as the cleanest fossil energy. Especially with the increasing energy consumption for human survival and the depletion of oil resources, how to convert natural gas into other Chemicals to reduce dependence on petroleum are of great interest. At present, the main industrial utilization of natural gas is the conversion of natural gas to chemicals through steam reforming and subsequent Fischer-Tropsch synthesis. However, this process has its own defects of high energy consumption and complicated process. The main component of natural gas is methane, and the key to realize the activation of methane is to develop an efficient cat...

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Problems solved by technology

FePO 4 / SiO 2 Carbon deposits occur in the catalyst after a period of reaction, and the activity is reduced (R.H.Lin, Y.J.Ding, L.F.Gong, W.D.Dong, W.M.Chen, Y.Lu, Cat.Today, 2011, 164, 34-39)

There are also reports in the literature that Rh / SiO 2 Catalysts used in methane bromination oxidation reaction (Z.Liu, L.Huang, W.S.Li, F.Yang, C.T.Au and X.P.Zhou, J.Mol.Catal.A:Chem., 2007, 273, 14-20), the The catalyst has higher catalytic activity than the ruthenium-based catalyst, but the catalyst has a higher loading of Rh and a higher reaction temperature (660°C)

Synthesis of Rh / SiO by sol-gel method by Liu et al. 2 Catalyst and its performance in catalytic methane bromination oxidation reaction was investigated, even though the catalyst can obtain close to 40% methane conversion and 90% CH at a reaction temperature of 660 3 Br selectivity, but there is a significant loss of noble metal Rh after nearly 700 hours of reaction (Z.Liu, W.S.Li, X.P.Zhou, J.Nat.Gas.Chem., 2010, 19, 522-529)

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