Iron-phosphorus-base catalyst for preparing bromomethane by methane oxybromination, and preparation method and application thereof

Abstract

The invention relates to an Fe-P-O / SBA-15 catalyst for preparing bromomethane and CO by methane oxybromination, which is composed of an active component and a support, wherein the active component comprises one or more of FePO4, Fe2P2O7 and alpha-Fe3(P2O7)2; the active component accounts for 1.0-60.0% of the catalyst by weight; the Fe / Si mol ratio in the catalyst is 0.001-1.0; the P / Si mol ratio in the catalyst is 1.0-5.0; the support is an SBA-15 full-silicon molecular sieve; and the specific area of the catalyst is 100-1500m<2> / g, and the pore volume is 0.65-1.20m<3> / g. The preparation method of the catalyst comprises the following steps: by using ferric salt, phosphoric acid [H3PO4] and ethyl orthosilicate [(C2H5O)4Si] as precursors and a triblock polymer [(EO)20(PO)70(EO)20] (P123 for short) as a template, introducing the active component into the support by a hydrothermal method, washing, filtering, drying, roasting and forming to obtain the Fe-P-O / SBA-15 catalyst.

Description

technical field [0001] The invention relates to a Fe-P-O / all-silicon molecular sieve SBA-15 catalyst used for methane bromination oxidation to prepare methyl bromide and CO, its preparation method and its use for preparing methyl bromide and CO from methane, oxygen and HBr aqueous solution. Background technique [0002] Natural gas is considered to be the cleanest fossil energy. With the increasing energy consumption for human survival, how to convert natural gas into other chemical raw materials is a key issue to reduce human dependence on petroleum resources. At present, the main way of industrial utilization of natural gas is to firstly synthesize gas through steam recombination, and then realize the indirect conversion of natural gas into chemicals through the subsequent Fischer-Tropsch synthesis reaction. Due to the high energy consumption and complicated process of this process, only the application in large natural gas fields can produce economic benefits. Natural ga...

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Problems solved by technology

Synthesis of Rh / SiO by sol-gel method by Liu et al. 2 Catalyst and investigated its catalytic methane bromination oxidation reaction performance, even if the catalyst can get nearly 40% methane conversion rate and 90% CH at the reaction temperature of 660 ° C 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)