Lawrencium base catalyst for preparing C2 oxygen-contained compound by using synthetic gas

Abstract

The rhodium base catalyst for preparing 2 carbon compound containing oxygen is formed from active component Rh and carrier, the weight content of Rh is 0.01-10%, and it is characterized by that the carrier adopted by said invention is a molecular sieve with proper pore size and higher Si / Al ratio. Its pore size is 0.5 nm to 30 nm, surface area is above 100-1500 sq.m / g, and Si-Al ratio is 5-infinity. Said invented catalyst can be used for synthesis of C2 oxygen-contained compound, can raise the conversion rate of CO and yield rate of C2 oxygen-contained compound.

Description

technical field [0001] The present invention relates to the production of C from synthesis gas 2 Oxygenate technology, in particular, provides a novel Rh-based catalyst supported by molecular sieves. Background technique [0002] Ethanol, acetaldehyde and acetic acid etc. C 2 Oxygenates have always been important chemical raw materials. The traditional preparation methods of these products mostly use grain and petroleum as raw materials. If they can be synthesized from syngas in one step, a large amount of grain can be saved, and the abundant and cheap coal and natural gas can be fully utilized. resources and broad application prospects. [0003] In the production of C using synthesis gas as raw material 2 In the reaction of oxygen-containing compounds, Rh is a necessary active metal component in highly active catalysts, such as: United Carbide Corporation (UCC) uses Rh / SiO 2 One-stage synthesis of acetic acid (UCC, patent-opening 51 80806) as catalyst; Rh-V-M / SiO 2 Syn...

AI Technical Summary

Problems solved by technology

In the past literature, most of the SiO 2 As catalyst carrier, and the molecular sieve with regular pore structure is used as the research of carrier preparation catalyst also less, only NaY molecular sieve is used as the carrier of catalyst (Xu Baiqing, W.M.H.Sachtler, Chemical Journal of Chinese Universities, 1999,12(5 ): 794-796), the prepared Rh / NaY catalyst was used in C 2 Synthesis of oxygenates, although a single C 2 Oxygenated compounds --- Higher selective synthesis of acetic acid, the selectivity is about 50%, but because the conversion rate of CO is too low, only about 1%, making C 2 The total yield of oxygen-containing compounds is still very low, only about 0.5-0.6%, and the increase of reaction temperature can increase the conversion rate of CO, but the C 2 Oxygenate selectivity drops rapidly