Using Bayberry Tannin to Construct Novel Pt/SiO2-C Catalyst and Its Catalytic Properties in Selective Hydrogenation of Cinnamaldehyde†

doi:10.7503/cjcu20140753

Abstract

Abstract:

A novel heterogeneous Pt/SiO₂-C catalyst was prepared by loading Pt⁴⁺on modified SiO₂ with bayberry tannin(BT), followed with reduction of NaBH₄ and carbonization. The as-prepared catalyst was characterized by TEM, XPS, XRD, FTIR and so on. Subsequently, the Pt/SiO₂-C catalyst was utilized in selective hydrogenation of cinnamaldehyde. Since the dispersion and stabilization function of BT molecular, which could efficiently growth of Pt nanoparticles and remain highly dispersion in carbonization process. The removal efficiency of BT, crystal type and size of Pt nanoparticles, specific surface area of SiO₂ and the performance of catalytic hydrogenation of cinnamaldehyde could be influenced by carbonization temperature. Pt/SiO₂-C-500 catalyst showed the best catalytic performance when the carbonization temperature was 500 ℃. The conversion of cinnamaldehyde was 82.98% and the selectivity to cinnamic alcohol was 91.33%(reaction conditions: 323.25 K, 2 MPa H₂ pressure and ethanol as solvent). After 5 cycles, the catalyst activity was about 81.18% of that in the first run, exhibiting excellent reusability.

Key words: Bayberry tannin, Pt nanoparticles, Silica dioxide, Cinnamaldehyde, Property of selective hydrogenation, Pt/SiO2-C catalyst

CLC Number:

O643

TrendMD:

FANG Chao, CHEN Yajun, MAO Hui, ZHAO Jun, JIANG Yunfu, ZHAO Shilin, MA Jun. Using Bayberry Tannin to Construct Novel Pt/SiO₂-C Catalyst and Its Catalytic Properties in Selective Hydrogenation of Cinnamaldehyde^†[J]. Chem. J. Chinese Universities, 2015, 36(1): 124.

Figures/Tables 14

Fig.1 Molecular structure of bayberry tannin

Fig.2 Illustration of forming procedure of Pt/SiO2-C catalysts

Fig.3 TG(a) and DTA(b) curves of Pt/SiO2-BT

Fig.4 FTIR spectra of SiO2(a) and SiO2-NH2(b)

Fig.5 FTIR spectra of catalyst under different carbonization temperatures a. Pt/SiO2-BT; b. Pt/SiO2-C-300; c. Pt/SiO2-C-500; d. Pt/SiO2-C-800.

Fig.6 TEM images of Pt/SiO2-BT(A), Pt/SiO2-C-500(C) and the corresponding size distributions of Pt nanoparticles(B,D)

Fig.7 XRD patterns of Pt/SiO2-BT(a), Pt/SiO2-C-300(b), Pt/SiO2-C-500(c) and Pt/SiO2-C-800(d) catalysts

Fig.8 XPS survey scan spectrum of Pt/SiO2-C-500

Fig.9 XPS spectra of Pt/SiO2-C catalyst

Table 1 Results of Pt/SiO2-BT and Pt/SiO2-C from N2 adsorption-desorption isotherms

Sample	S_BET/(m²·g^-1)	Pore size/nm
Pt/SiO₂-BT	99.33
Pt/SiO₂-C-300	130.51	13.97
Pt/SiO₂-C-500	187.93	15.67
Pt/SiO₂-C-800	220.55	19.78

Fig.10 Reaction pathway of hydrogenation of CAL

Table 2 Results for the hydrogenation of CAL over different catalysts

Catalyst	Reaction time/h	Conversion(%)	Selectivity(%)
Catalyst	Reaction time/h	Conversion(%)	HCAL	HCOL	COL	Others^*
Pt/SiO₂-BT	6	95.41	68.82	24.95	5.98	0.25
Pt/SiO₂-C-300	6	95.12	5.53	15.18	78.15	1.14
Pt/SiO₂-C-500	6	82.98	3.55	4.58	91.33	0.54
Pt/SiO₂-C-800	6	28.34	10.86	4.72	83.64	0.78

Fig.11 Dependence of conversion and product selectivity with reaction time

Fig.12 Reusability of Pt/SiO2-C-500 catalyst

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Using Bayberry Tannin to Construct Novel Pt/SiO₂-C Catalyst and Its Catalytic Properties in Selective Hydrogenation of Cinnamaldehyde^†

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