High temperature-resistant methanation catalyst preparation method

Abstract

The invention discloses a high temperature-resistant methanation catalyst preparation method. The preparation method comprises preparing a catalyst semi-finished product with composite functions from nickel as an active component, a rare earth metal as a cocatalyst, and alkaline earth metal and alkali metal as anti-carbon formation components by a precipitation method, adding kaliophilite, graphite and pure calcium aluminate cement into the catalyst semi-finished product, carrying out mixing to obtain a uniform mixture, carrying out granulation and tabletting molding, and carrying out steam curing to obtain the catalyst finished product. The high temperature-resistant methanation catalyst retains good methanation activity in a use temperature range of 300-700 DEG C and has good thermostability and anti-carbon formation performances.

Description

technical field [0001] The invention belongs to the technical field of coal-to-synthesis gas to natural gas, in particular to a preparation method of a high-temperature-resistant methanation catalyst. Background technique [0002] Natural gas is an efficient, safe and clean fossil energy. Methanation reaction is the core technology of coal-to-natural gas, and methanation reaction is a strong exothermic reaction. In the usual gas components, every 1% of CO methane can produce an adiabatic temperature rise of 74°C for every 1 percentage point of CO 2 Methanation can produce an adiabatic temperature rise of 60°C. The large amount of heat released by the methanation reaction will cause the reactor bed to overheat instantaneously, causing the catalyst to be sintered at high temperature and deactivated. The occurrence of carbon deposition reaction leads to the reduction of catalyst activity; therefore, high temperature sintering and carbon deposition of the catalyst are the key t...

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Problems solved by technology

[0003] The methanation catalysts prepared in Chinese patents CN102029162 and CN102259004A all adopt the homogeneous precipitation method, and the components of the prepared methanation catalyst are uniformly dispersed, and the activity of the catalyst is good at high temperature, but the NiO and Al in the catalyst 2 o 3 The combination is tight, the catalyst reduction temperature is high, and the thermal stability and carbon deposition resistance of the catalyst are poor, so it does not use industrial production

The methanation catalyst prepared by Chinese patent CN102836718A is a methanation catalyst prepared by first preparing a high-temperature resistant and sintering-resistant hexaaluminate carrier, and then impregnating the active component NiO. Since the active component NiO is loaded on the hexaaluminate carrier In general, the prepared methanation catalyst has good thermal stability, but the specific surface area of ​​the hexaaluminate carrier is low, and the preparation process is complicated, which is not conducive to industrial production

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