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A microreactor for methanol anaerobic dehydrogenation reaction and its preparation and application

A micro-reactor, methanol technology, applied in the chemical industry, can solve the problems that the shaped particles cannot be contacted by the substrate molecules, the catalytic active center cannot be completely exposed, and is easy to break and pulverize. Selectivity, reducing the effect of decomposition

Inactive Publication Date: 2017-05-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in the traditional fixed bed reactor, the catalyst is molded and filled, and the interior of the molded particles cannot be contacted by the substrate molecules, and the catalytic active center cannot be completely exposed. It is also easy to break and pulverize during the reverse process, and the reactor is blocked.

Method used

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  • A microreactor for methanol anaerobic dehydrogenation reaction and its preparation and application
  • A microreactor for methanol anaerobic dehydrogenation reaction and its preparation and application

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A quartz capillary with an inner diameter of 3 mm was used as a microreactor, and ammonia gas was passed through the quartz capillary at a flow rate of 30 mL / min at 500 °C for 6 h. The aqueous solution of cerium nitrate and chloroauric acid with a total concentration of 1mmol / L was passed through the quartz capillary at a flow rate of 0.5mL / min by a flow pump and kept for 1h. The molar ratio of cerium to gold is 10:1. The adsorbed capillary was calcined at 400° C. for 3 h in an air atmosphere. Get the quartz capillary as a microreactor, which can be named as 10wt%-Au / CeO 2 -Mr.

Embodiment 2

[0024] A quartz capillary with an inner diameter of 3 mm was used as a microreactor, and ammonia gas was passed through the quartz capillary at a flow rate of 5 mL / min at 800 °C for 6 h. An aqueous solution of cerium nitrate and chloroplatinic acid with a total concentration of 1 mmol / L was passed through the quartz capillary at a flow rate of 0.5 mL / min by a flow pump for 1 h. The molar ratio of cerium to platinum is 20:1. The adsorbed capillary was calcined at 500° C. for 3 h in an air atmosphere. Get the quartz capillary as microreactor, which can be named as 5.2wt%-Pt / CeO 2 -Mr.

Embodiment 3

[0026] A quartz capillary with an inner diameter of 3 mm was used as a microreactor, and ammonia gas was passed through the quartz capillary at a flow rate of 5 mL / min at 400 °C for 24 h. An aqueous solution of cerium nitrate and palladium dichloride with a concentration of 1 mmol / L was passed through the quartz capillary at a flow rate of 0.5 mL / min by a flow pump and kept for 1 h. The molar ratio of cerium to palladium is 20:1. The adsorbed capillary was calcined at 300° C. for 3 h in an air atmosphere. Get the quartz capillary as a microreactor, which can be named as 4.5wt%-Pd / CeO 2 -Mr.

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Abstract

The invention relates to the preparation and application of a capillary microreactor for methanol anaerobic dehydrogenation reaction. A microreactor is constructed by decorating a layer of oxide-supported noble metal catalyst inside a quartz capillary. The capillary microreactor is applied to the study of methanol anaerobic dehydrogenation, and achieves high methanol conversion and anhydrous formaldehyde selectivity under mild conditions.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to the preparation and application of a microreactor for methanol anaerobic dehydrogenation reaction. Background technique [0002] Formaldehyde is an important organic basic chemical raw material. It has special applications in polymer materials, fine chemicals, organic synthesis, pharmaceutical intermediate synthesis, advanced perfume synthesis, dyes, etc., and its economic benefits are very significant. With the rise of synthetic high-performance engineering plastics, the demand for formaldehyde is increasing, and the requirements for formaldehyde concentration are becoming increasingly stringent. The presence of water affects the development of downstream products of formaldehyde. When synthesizing high-performance urea-formaldehyde resins and phenolic resins, the concentration of formaldehyde directly affects the polymerization rate and degree of polymeri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/00C07C47/052C07C45/29
Inventor 王峰王敏徐杰马继平于淼张哲
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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