固载磷钨酸的大孔道功能化MOFs合成及催化性能

doi:10.11896/j.issn.1005-023X.2018.14.027

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Abstract Obtaining large pore carriers to immobilize phosphotungstic acid (PTA) is of great significance for the catalytic conversion of big molecular substances. In this study, the surfactant cetyltrimethylammonium bromide (CTAB) was applied as a structure-directing agent for metal-organic frameworks (MOFs). MIL-101(Cr) was synthesized with -NH₂ and -Cl to realize its functiona-lization, and well-dispersed PTA on MIL-101(Cr) was obtained. It was found that with the addition of CTAB, although the obtained samples maintained the MIL-101 structure, their crystal growth became poor gradually with adding amount of CTAB and possessed great thermal stability. MOFs’ surface areas and pore sizes increased with the increase of CTAB. Samples switched from microporous structure to micro-mesoporous structure when MOFs coexisted with the adding of CTAB. Moreover, the mesoporous structures increased along with the increase of CTAB. When the adding amount of CTAB was 5.4 mmol, the optimum mesoporous ratio reached the peak with about 87%, mainly with pore sizes of 3.9 nm and 46.1 nm. The addition of CTAB would not interfere with the electrostatic interaction between -NH₂ and PTA, but the amount of immobilized PTA increased first and then decreased with the increase of CTAB. The immobilized PTA reached the maximum at CTAB equals to 3.6 mmol. As the amount of loading PTA, the glucose yield of cellulose hydrolysis catalyzed has same trend. The yield of glucose can reach 76.35% of the catalytic effect compared with same amount of non-immobilized PTA. After three consecutive catalytic hydrolysis of microcrystalline cellulose samples, the glucose yield decreased by only about 5%, indicating that grafted -NH₂ exerts its function of immobilization PTA by electrostatic interaction and reduces the loss of PTA.

Key words： metal-organic frameworks MIL-101 phosphotungstic acid mesopores

Published: 31 July 2018

CLC number:

TQ426.91

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	Articles by authors
	HAO Jinlei
	ZHANG Guihua
	WANG Yan
	WAN Jinquan
	MA Yongwen
	HUANG Liyan

Cite this article:

HAO Jinlei,ZHANG Guihua,WANG Yan, et al. Synthesis and Characteristics of Functional Mesoporous Metal-Organic Frameworks with Immobilized Phosphotungstic Acid[J]. Materials Reports, 2018, 32(14): 2475-2480.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.14.027 OR http://www.mater-rep.com/EN/Y2018/V32/I14/2475

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