Mordenite zeolite catalyst with special morphology and preparation method thereof

A mordenite and catalyst technology, applied in the field of special morphology mordenite catalyst and its preparation, can solve problems such as poor diffusion performance of molecular sieve catalyst, and achieve the effects of excellent reaction performance, improved performance, and smooth diffusion channels

Active Publication Date: 2020-03-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the technical problems to be solved by the present invention is to provide a novel mordenite with chain-like morphology as the carrier of the catalyst in order to overcome the problem of poor diffusion performance of molecular sieve catalysts in the prior art. In the conversion of aromatic hydrocarbons such as base transfer and isomerization, it has efficient management performance for aromatic ring side chain alkyl groups, and can adapt to high space velocity reaction conditions and mass transfer requirements

Method used

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  • Mordenite zeolite catalyst with special morphology and preparation method thereof
  • Mordenite zeolite catalyst with special morphology and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 60 grams of chain-shaped mordenite (referred to as LM, with a silicon-aluminum ratio of 25), add deionized water and knead evenly, extrude into a rod, and dry to obtain a catalyst precursor. The precursor is calcined at 595 ° C for 3 hours in an air atmosphere , pelletized to obtain the catalyst.

[0034] With the above-mentioned catalyst, the catalyst evaluation was carried out on a fixed-bed continuous micro-reactor near hydrogen, and the reactor specification was The loading capacity is 20.0 grams. The aromatic hydrocarbon transalkylation reaction uses toluene and trimethylbenzene with a molar ratio of 45:55 as the model raw material, and the hydrogen hydrocarbon molar ratio H 2 / HC=2.7 (The following examples and comparative examples are all evaluated according to the above conditions). First use hydrogen to exhaust the air in the reaction system and pressurize it to 2.0MPa, and control the feed reaction space velocity of the above raw materials to 2.0h -1,...

Embodiment 2

[0039] Take by weighing 60 grams of LM dry powder, add chromium nitrate (according to the metal content of 2.8%wt), add deionized water and knead evenly, extrude and form, and dry to obtain the catalyst precursor, the precursor is roasted at 595 ° C in air atmosphere for 3 hours, and pelletized to obtain catalyst.

[0040] With the catalyzer that above-mentioned embodiment makes, under the working conditions of referring to embodiment 1, first discharge the air of reaction system with hydrogen and pressurize to 2.5MPa, the feeding reaction space velocity of control above-mentioned raw material is 2.5h -1 , control the reaction temperature to 398°C.

Embodiment 3

[0042] Take by weighing 60 grams of LM dry powder, add ammonium molybdate (by 2.8%wt metal content), add deionized water and knead evenly, extrude and form, and dry to obtain the catalyst precursor. Get a catalyst.

[0043] With the catalyzer that above-mentioned embodiment makes, under the working conditions of referring to embodiment 1, first discharge the air of reaction system with hydrogen and pressurize to 2.5MPa, the feeding reaction space velocity of control above-mentioned raw material is 2.5h -1 , control the reaction temperature to 398°C.

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Abstract

The invention relates to a special-form mordenite catalyst and a preparing method thereof. The problem that the catalyst has a low activity and selectivity in an arene transalkylation reaction is mainly solved while the chain form improves the efficient mass transfer performance of a molecular sieve based catalyst. The chain-form mordenite serves as a carrier of the catalyst, and active componentsare selected from at least one of VIB elements, at least one of IIB elements, and at least one metal element in IA. The special-form mordenite catalyst well solves the technical problem and can be applied to industrial production of arene conversion like the arene transalkylation reaction.

Description

technical field [0001] The invention relates to a mordenite catalyst with a special shape and a preparation method thereof, and is applied to the transalkylation reaction of aromatic hydrocarbons. Background technique [0002] As one of the earliest zeolites recognized by humans, mordenite has special acid distribution and regular mass transfer channels, and has important industrial application value in petrochemical fields such as adsorption separation, catalytic cracking, disproportionation, transalkylation, and isomerization. In the two-dimensional pore system of mordenite, for the reaction of macromolecules such as aromatic hydrocarbons, the catalytic action generally only occurs in the elliptical straight main channel of the twelve-membered ring, while the eight-membered ring channel communicating with the main channel generally does not enter the channel. Therefore, for the reaction to reduce the diffusion limit, inhibiting the rapid growth of mordenite crystals in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/26B01J29/18B01J35/10C07C6/12C07C15/08
CPCB01J29/18B01J29/185B01J29/26B01J35/1019B01J2229/18C07C6/126C07C15/08Y02P20/52
Inventor 童伟益祁晓岚李经球李华英
Owner CHINA PETROLEUM & CHEM CORP
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