Loaded type molybdenum oxide catalyst for selectively oxidizing methanol to synthesize dimethoxymethane (DMM) and application

Abstract

The invention relates to a loaded type molybdenum oxide catalyst for selectively oxidizing methanol to synthesize dimethoxymethane (DMM) and an application. In a stationary bed reactor, a catalyst is preformed and sieved; the size of the grain size of the catalyst occupies 1-16% of the diameter of the reactor; the filling bed height / reactor bed diameter of the catalyst is equal to 0.2-3; nitrogen is introduced at first and then oxygen and the methanol are introduced so that the methanol is bubbled and fed; and the DMM is synthesized through a reaction under a constant pressure, and the reaction time is 3-12 hours; the total feeding space velocity is 4,000-20,000 hour<-1>; a volume ratio of the oxygen to the methanol ranges from 1: 1 to 4: 1; the volume of the oxygen to the nitrogen ranges from 1:5 to 1:2; and the reaction temperature is 90-200 DEG C, so that the DMM can be obtained. The methanol is used as a raw material to prepare the DMM through selective oxidation, so that fewer by-products, high cleaning property and no pollution can be realized. Compared with the conventional catalyzing system, the catalyst preparation process is simple and the cost is small. Furthermore, the requirement on the preparation method is low, and the large-scale application is convenient.

Description

technical field [0001] The invention belongs to a methanol oxidation catalyst and a preparation method thereof, in particular to a supported molybdenum oxide catalyst for the selective oxidation of methanol to synthesize dimethoxymethane and its application. Background technique [0002] Today, due to the increasing shortage of oil resources and rising oil prices, methanol, as the cornerstone product of C1 chemistry, has become a trend to replace the source of petrochemical raw materials. Dimethoxymethane (DMM), as a downstream product of methanol oxidation, has great potential application prospects in energy and environmental protection. Dimethoxymethane is colorless, non-toxic, and widely used. It is an environmentally friendly chemical raw material and an excellent organic solvent in the pharmaceutical and cosmetic industry. More importantly, it can be used as a new type of fuel additive to replace part of diesel oil and reduce Crude oil imports can also improve the comb...

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Problems solved by technology

Recently, Gornay et al. reported the direct oxidation of methanol to DMM using FeMo catalyst, and obtained a higher yield of DMM, but the reaction conditions were relatively harsh (Green Chemistry, 2010,12(10):1722-1725)

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