Hydrogenation of 4-Nitrophenol over MIL-101 Confinement Au Nanoparticles Catalyst†

doi:10.7503/cjcu20150691

Abstract

Abstract:

A series of Au@MIL-101 catalysts with good catalytic activity was prepared. The X-ray powder diffraction (PXRD), transmission electron microscopy (TEM), physical adsorption and atomic emission spectroscopy (AES) were used to characterize and analyze the catalysts. The 0.29%Au@MIL-101 catalyst displayed a good catalytic activity for 4-nitrophenol reduction under mild reaction conditions.

Key words: MIL-101, Confinement effect, Au nanoparticles, Hydrogenation of 4-nitrophenol

CLC Number:

O643.32

TrendMD:

WANG Kai, XU Li, CHEN Hengze, QIAO Huiying, CHEN Chao, ZHANG Ning. Hydrogenation of 4-Nitrophenol over MIL-101 Confinement Au Nanoparticles Catalyst^†[J]. Chem. J. Chinese Universities, 2016, 37(4): 723.

Figures/Tables 5

Fig.1 PXRD patterns of 3.71%Au@MIL-101(a), 2.57%Au@MIL-101(b), 1.26%Au@MIL-101(c), 0.71%Au@MIL-101(d), 0.60%Au@MIL-101(e), 0.29%Au@MIL-101(f), 0.11%Au@MIL-101(g) and MIL-101(h)

Fig.2 HRTEM images(A—H) and corresponding particle distributions(A’—H’) of 3.71%Au@MIL-101(A, A’), 2.57%Au@MIL-101(B, B’), 1.26%Au@MIL-101(C, C’), 0.71%Au@MIL-101(D, D’), 0.60%Au@MIL-101(E, E’), 0.29%Au@MIL-101(F, F’), 0.11%Au@MIL-101(G, G’) and 0.30%Au@SiO2(H, H’)

Fig.3 Time-dependent UV-Vis spectral changes of the mixture of p-NPh, NaBH4 and typical samples, Cr-MIL-101(A), 3.71%Au@MIL-101(B), 0.71%Au@MIL-101(C), 0.29%Au@MIL-101(D), 0.11%Au@MIL-101(E) and 0.30%Au@SiO2(F)

Fig.4 Plot of ln(ct/c0) vs. reaction time and temperature in the presence of 3.71%Au@MIL-101(a), 0.71%Au@MIL-101(b), 0.29%Au@MIL-101(c), 0.11%Au@MIL-101(d)(A), the catalyst of 0.29%Au@MIL-101 at 20 ℃(e), 30 ℃(f), 40 ℃(g)(B) and the catalyst of 0.29%Au@MIL-101 linear plot of k vs. T-1(C)

Table 1 Kinetics data of catalysts

Sample	Temperature/℃	Reaction constant, k/min^-1	10⁴ Reaction rate, r/ (mol·L^-1·min^-1)	MS $A b Au$ / (mol·L^-1·min^-1·g^-1)	$R 2 c$
3.71%Au@MIL-101	30	0.10	0. 92	0.08	0.98
0.71%Au@MIL-101	30	0.81	5.6	2.60	0.99
0.29%Au@MIL-101	20	0.26	2.31	2.66	0.99
0.29%Au@MIL-101	30	0.42	3.43	3.94	0.99
0.29%Au@MIL-101	40	0.53	4.1	4.71	0.99
0.11%Au@MIL-101	30	0.12	1.16	3.52	0.99
0.30%Au@SiO₂	30	0.37	3.06	3.33	0.99
0.31%Au@C	30	0.26	2.7	2.9	0.98

Table 1 Kinetics data of catalysts

Sample	Temperature/℃	Reaction constant, k/min^-1	10⁴ Reaction rate, r/ (mol·L^-1·min^-1)	MS $A b Au$ / (mol·L^-1·min^-1·g^-1)	$R 2 c$
3.71%Au@MIL-101	30	0.10	0. 92	0.08	0.98
0.71%Au@MIL-101	30	0.81	5.6	2.60	0.99
0.29%Au@MIL-101	20	0.26	2.31	2.66	0.99
0.29%Au@MIL-101	30	0.42	3.43	3.94	0.99
0.29%Au@MIL-101	40	0.53	4.1	4.71	0.99
0.11%Au@MIL-101	30	0.12	1.16	3.52	0.99
0.30%Au@SiO₂	30	0.37	3.06	3.33	0.99
0.31%Au@C	30	0.26	2.7	2.9	0.98

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