The Effect of Pretreatment on the Reactivity of Pd/Al2O3 in Room Temperature Formaldehyde Oxidation

被引：15

作者：

Zhang, Lina ^{[1
]}

Zhang, Bangjie ^{[1
]}

Xue, Peng ^{[1
]}

Li, Jiwei ^{[1
]}

Zhang, Zhun ^{[1
]}

Yang, Yanling ^{[1
]}

Wang, Shuai ^{[1
]}

Lin, Jingdong ^{[1
]}

Liao, Honggang ^{[1
]}

Wang, Yong ^{[2
]}

Yao, Yali ^{[3
]}

Wan, Shaolong ^{[1
]}

Xiong, Haifeng ^{[1
]}

机构：

[1] Xiamen Univ, Collaborat Innovat Ctr Chem Energy Mat, Natl Engn Lab Green Chem Prod Alcohols Ethers Est, State Key Lab Phys Chem Solid Surfaces,Coll Chem, Xiamen 361005, Peoples R China

[2] Washington State Univ, Voiland Sch Chem Engn & Bioengn, Pullman, WA 99164 USA

[3] Univ South Africa, Inst Dev Energy African Sustainabil, Private Bag X6 Roodepoort, ZA-1710 Florida, South Africa

来源：

CHEMCATCHEM | 2021年 / 13卷 / 19期

基金：

中国国家自然科学基金;

关键词：

Room temperature formaldehyde oxidation; Pd; Al2O3; nanocatalyst; Steam treatment; PdO; Pd transformation; CATALYTIC-OXIDATION; AMBIENT-TEMPERATURE; PD/TIO2; CATALYSTS; ACTIVE-SITES; EFFICIENT; PD; REMOVAL; PERFORMANCE; DECOMPOSITION; MECHANISM;

D O I：

10.1002/cctc.202101091

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A Pd/Al2O3 nanocatalyst was pretreated at 750 degrees C in air, Ar or H2O/Ar, respectively. The effect of these different pretreatments on the active species and reactivity of Pd/Al2O3 in formaldehyde oxidation at room temperature was investigated. The pretreatment was found to affect both the phase transformation of PdO to Pd metal and the Pd dispersion, leading to different catalytic performances. We found that the Pd/Al2O3 nanocatalyst pretreated in both Ar and H2O/Ar show 60 % and 100 % formaldehyde conversion at 25 degrees C, respectively, while the catalyst pretreated in air is not active under the same condition. Pretreatments in both Ar and H2O/Ar were found to facilitate the formation of metallic Pd on Pd/Al2O3 catalyst, confirmed by both experiments and calculation based on the function of the equilibrium oxygen pressure and temperature. We further found that the catalyst pretreated in H2O/Ar has higher Pd dispersion and more surface OH groups compared to that pretreated in Ar, leading to improved activity in formaldehyde oxidation.

引用

页码：4133 / 4141

页数：9

共 45 条

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