长链烷烃临氢异构化Pt/SAPO-11催化剂的研究

doi:10.3969/j.issn.0253-2417.2023.03.012

Abstract

Abstract:

Using H₂PtCl₆ as precursor, the influence of metal-acid catalytic function of Pt/SAPO-11 catalyst on the isomerization of long-chain n-alkanes under different metal loadings was investigated. The results revealed that with the increase of platinum loading, the conversion of n-dodecane increased, and the isomerization selectivity initially increased and then decreased. When the Pt loading was 0.25%, the conversion could achieve 63.4%, with corresponding selectivity of iso-dodecane was 97.3%. By maintaining the number ratio of metal center to Br?nsted acid center(n_Pt/n_A) within a reasonable range of 0.2-0.3, the Pt/SAPO-11 catalyst exhibited better long-chain n-alkanes hydroisomerization activity.

Key words: long-chain n-alkanes, hydroisomerization, Pt, SAPO-11

CLC Number:

TQ35

Haolin WANG, Zefeng LIAO, Yang LI, Jinbao ZHENG, Zhifeng ZHENG, Binghui CHEN. Pt/SAPO-11 Catalysts for Hydroisomerization of Long-chain Alkanes[J]. Chemistry and Industry of Forest Products, 2023, 43(3): 101-107.

Figures/Tables 7

Fig.1

Table 1

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Table 2

Table 3

Table 4

References 30

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催化剂catalyst	Lewis酸强度/(μmol?g^-1)Lewis acid strength(L)	Br?nsted酸强度/(μmol?g^-1)Br?nsted acid strength(B)	B/L	B/(B+L)	金属分散度/% metal dispersion
SAPO-11	5.4	23.9	4.4	0.82
0.1% Pt/SAPO-11	5.4	32.0	5.9	0.86	32.6
0.25% Pt/SAPO-11	4.4	35.8	8.1	0.89	77.0
0.5% Pt/SAPO-11	6.4	42.6	6.7	0.87	40.7
0.75% Pt/SAPO-11	5.1	33.0	6.5	0.87	45.5
1% Pt/SAPO-11	4.9	22.1	4.5	0.82	32.3

催化剂¹⁾catalyst	Pt⁰结合能Pt binding energy/eV		Pt⁰/(Pt⁰+Pt²⁺)/%	Pt²⁺结合能Pt²⁺ binding energy/eV
催化剂¹⁾catalyst	Pt 4d_5/2	Pt 4d_3/2	Pt⁰/(Pt⁰+Pt²⁺)/%	Pt 4d_5/2	Pt 4d_3/2
0.25%Pt/SAPO-11^*	314.5	331.2	94.3	315.9	332.6
0.5%Pt/SAPO-11	314.5	331.2	93.1	315.9	332.6
0.75%Pt/SAPO-11	314.5	331.2	90.2	315.9	332.6
1%Pt/SAPO-11	314.5	331.2	89.7	315.9	332.6

催化剂catalyst	转化频率/s^-1turnover frequency(TOF)	正十二烷转化率/% conversion of n-dodecane	异十二烷选择性/% isododecane selectivity	异十二烷得率/% isododecane yield
0.1%Pt/SAPO-11	0.98	24.9	64.3	16.0
0.25%Pt/SAPO-11	0.42	63.4	97.3	61.7
0.5%Pt/SAPO-11	0.41	64.4	86.1	55.4
0.75%Pt/SAPO-11	0.29	67.4	76.1	51.2
1%Pt/SAPO-11	0.31	79.5	59.6	47.4

催化剂catalyst	C₁~C₅/%	C₆/%	C₇/%	C₈/%	C_9/%	C₁₀/%	C₁₁/%	iso-C₁₂/%
0.1%Pt/SAPO-11	1.6	18.5	10.8	4.8	0.0	0.0	0.0	64.3
0.25%Pt/SAPO-11	0.6	0.6	0.6	0.6	0.0	0.0	0.2	97.3
0.75%Pt/SAPO-11	0.9	13.6	4.6	3.1	1.0	0.0	0.6	76.1

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Pt/SAPO-11 Catalysts for Hydroisomerization of Long-chain Alkanes

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