Novel nano composite methanation catalyst and preparation method thereof

Abstract

The invention discloses a novel nano composite methanation catalyst and a preparation method thereof. The preparation method comprises the following steps: adding a tetrabutyl titanate and ethyl alcohol mixed solution dropwise into an ethyl alcohol and nitric acid mixed water solution at room temperature, and hydrolyzing tetrabutyl titanate so as to obtain sol; drying the sol to form gel, and forging to obtain nano TiO2 powder; mixing pseudo-boehmite and deionized water to obtain a turbid liquid, and adding nitric acid to obtain semitransparent sol gama-AlOOH; adding the nano TiO2 powder into the semitransparent sol gama-AlOOH, drying overnight, and baking to obtain TiO2 / gama-Al2O3 nano powder as a methanation catalyst carrier; dipping a nickel nitrate solution on the methanation catalyst carrier, drying, and forging to obtain a NiO / TiO2 / Al2O3 catalyst; and dipping an additive on the carrier, thereby obtaining a NiO-M / TiO2 / Al2O3 catalyst. According to the invention, nanoscale titanium oxide and a nanoscale aluminum oxide composite material act as the carriers, and NiO acts as an active component, so that the novel nano composite methanation catalyst is prepared.

Description

Technical field [0001] The invention belongs to the field of catalyst preparation and its application, and relates to a novel nano composite methanation catalyst and a preparation method thereof. Background technique [0002] As a country with "rich coal, poor oil and gas", coal resources account for a large proportion of the entire energy structure. At the same time, a large part of my country's coal resources is low-quality lignite, which has low direct utilization rate and pollution Big. The lignite gasification is made into synthesis gas, which provides raw materials for downstream coal-to-natural gas, coal-to-methanol, and coal-to-oil. Among them, the coal-to-natural gas process (SNG) has a high carbon monoxide utilization rate (close to 100%) and good product selectivity. Product natural gas can be transported directly using national natural gas pipelines. [0003] The key to the coal-to-natural gas process lies in the methanation catalyst. The methanation catalyst is genera...

AI Technical Summary

Problems solved by technology

[0006] In the Chinese patent application CN102527395A (a preparation method of a new type of methanation catalyst), the calcination temperature is too high, energy is wasted, and a series of high-temperature-resistant catalyst preparation devices are required, such as: high-temperature fast dehydrator, high-temperature cyclone separator, etc.